This booklet was developed as a part of Special Study Unit (Doctors as Teachers) at Peninsula Medical School. This booklet covers some of the important aspects of Ophthalmology. This booklet could be used as a quick revision guide before finals and also could be used along Ophthalmology placements. The purpose of this booklet is to provide some insight into the most common presentations of red eye and their management.
about 8 years ago
http://www.handwrittenturorials.com - This tutorial is a basic overview of the anatomy of the eye. It covers the gross structures of the eyeball and the causes of the conditions, Glaucoma and Papilloedema. For more entirely FREE tutorials and the accompanying PDFs visit http://www.handwrittentutorials.com
over 6 years ago
1. Sleep (I realize I’m posting this at 12:30 am…) (http://www.helpguide.org/life/sleep_tips.htm) I know there’s a popular perception of sleep deprivation going hand in hand with working hard or succeeding academically. However, that is only true if you’re working very last minute, and don’t care about retaining the information–you basically just want to get through your upcoming test/assignment. I would like to clarify that, although learning about 10 months of material in 2 weeks is overwhelming, it is NOT last minute because whatever you’re working on right now, you’ll have to remember in 2 weeks for your exam. Besides the exam, if you’re studying medicine, you need to remember most of these things for the rest of your life. In order to retain that information, you need to stay alert, well rested and motivated. Prolonged sleep deprivation can make you feel very ‘CBA’ very fast. 2. Stay Energized Sleep is only one factor in staying motivated and alert; another is staying energized¬–in a healthy way. Simply put: if you feel well, you’ll work well. Eat well: difficult, I know, when you’ve got so little time to spare; but as much as you can, try to eat more whole foods (aka things that don’t come in wrappers or have their own commercial) and keep a balanced diet (too much of anything is usually not good). Everyone snacks while they’re doing exams, but try to find a vice that won’t put you in a sugar coma (some good examples include berries and other fruits, nuts, carrots with hummus to dip in, granola bars, etc). Note: drinking tea is also an excellent way to stay energized! Stay active: Again, I know something like this is difficult to keep up in normal everyday life, let alone during exam stress. Even if it is just for 15-20 minutes, some cardio (note: the more strenuous the workout in a short period of time, the more benefit you’ll get) is a fantastic ‘eye-opener’ (I learned that phrase while learning how to take an alcohol history and now I really like it)! No one wants to go for a run in the morning, but after you get past the first 2-3 minutes of wanting to collapse, your body starts to feel really grateful. This is the BEST way to stimulate your senses and wake yourself up. I promise it’s better than any energy drink or cup of coffee you could have. Take small breaks: SMALL breaks!!! About 10 minutes. Every once in a while, you need to get up and walk around to give yourself a break, have some fresh air, grab a snack, but try not to get carried away; try to avoid having a short attention span. 3. Make Lists I cannot stress enough how counterproductive it is to overwhelm yourself with the amount of work you have. Whether you think about it or not, that pile is not going anywhere. Thinking about it won’t wish it away. Stop psyching yourself out and just get on with it– step by step. Making a list of objectives you need to accomplish that day or week is a great way to start; then, cross them out as you go along (such a satisfying feeling). Being able to visualize your progress will be a great motivator. Remember: it is important to be systematic with your studying approach; if you jump around between modules because they’re boring you’re just going to confuse yourself and make it hard to remember things when that exam comes Note: I have a white board in my room where I write my objectives for the week. Some days it motivates, some days it I want to throw it out the window (but I can't reach the latch)… 4. Practice Questions Practice questions are excellent for monitoring your progress; they’re also excellent at scaring you. Do not fear! This is a good thing, because now you know what you’re missing, go back and read up on what you forgot to take a look at, and come back and do the questions later. Then give yourself a sticker for getting it right ? Practice questions are also great for last minute studying too because they can help you do what I call “backwards studying”–which is what I just described: figuring out what you need to learn based on what the questions look like. 5. Be realistic Set realistic goals for yourself; most importantly, set realistic daily goals for yourself so that when you get all or most or even some of them done you can go to sleep with a level of satisfaction. Also, you need to pick your battles. Example: if you suck at neuro, then one module’s loss is another’s gain. Don’t spend too much time trying to get through one thing, just keep moving forward, and come back to it later 6. ‘Do not disturb’ Facebook, twitter, instagram, youtube, whatsapp, texting, pinterest, meme websites, so many fantastic ways to kill your time… Do yourself a favor, save them for your breaks. If someone is dying or on fire, they will most likely call you, not text you or write on your wall; you do not need to check your phone that often unless you're expecting something time sensitive. 7.Don’t Compare Everyone studying in your program is going to be stressed about things; do NOT let it rub off on you. You know those moments when you hear a peer or a prof/tutor describing something you have never even heard of, then you start panicking? Yeah, don’t do that. It happens to everyone. Instead of worrying so much, just go read about it! Simple solution right? What else are you going to do? Plus, a lot of the time other students seem to know more than they need to about certain things (which I can tell you right now, doesn’t always mean they’re doing better than you; knowing random, very specific factoids doesn’t mean they can bring it in clinic. Everyone can pull a Hermione and know a book inside out, but this is not necessarily the hallmark of a good doctor), what’s it to you? Worry about yourself, be confident in your abilities, and don’t trouble yourself with comparing to other people 8.Practice for Practicals Everyone is afraid of practical exams, like the OSCE (at any rest station you're likely to find me with my head in my hands trying to stabilize my breathing pattern and trying not to cry). The best way to be ready is to practice and practice and practice and practice. It’s like learning to drive a car. At first you’re too aware of your foot on the gas, the position of your hand on the wheel, etc; but, after driving for a little while, these things become subconscious. In the same way, when you walk into a station, you could be so worried about how you’ll do your introduction and gain consent, and remembering to wash your hands, and getting equipment and and and and and; the anxiety affects your confidence and your competence. If you practice enough, then no matter what they throw at you, you will get most of the points because the process will be second nature to you. Practice on your roommates, friends, family members, patients with a doctor's help...when appropriate... Even your stuffed animals if you're really desperate. DO NOT leave practicing for these practicals to the last minute; and if you do, make sure you go through every thing over and over again until you’re explaining examinations in your sleep. NOTE: When I'm practicing for OSCE alone, I record myself over and over again and play it back to myself and criticize it, and then practice againn. 9.Consistency You don’t necessarily have to study in the same place every day; however, it is always good to have some level of routine. Some examples include: waking up/sleeping at the same time everyday, going for a run at the same time every day, having the same study routine, etc. Repetition is a good way to keep your brain focused on new activities because, like I said before, the more you repeat things, the more they become second nature to you. Hope these tips are of some use to you; if not, feel free to sound off in the comments some alternate ways to get through exams. Remember that while exams are stressful, this is the time where you build your character and find out what you’re truly capable of. When you drop your pen after that final exam, you want to feel satisfied and relieved, not regretful. Happy Studying ?
about 7 years ago
I started medical school in 2007 wanting to 'making people better'. I stopped medical school in 2010 facing the reality of not being able to get better myself, being ill and later to be diagnosed with several long term health conditions. This post is about my transition from being a medical student, to the other side - being a patient. There are many things I wish I knew about long-term health conditions and patients when I was a medical student. I hope that through this post, current medical students can become aware of some of theses things and put them into practice as doctors themselves. I went to medical school because I wanted to help people and make them better. I admired doctors up on their pedestals for their knowledge and skills and expertise to 'fix things'. The hardest thing for me was accepting that doctors can't always make people better - they couldn't make me better. Holding doctors so highly meant it was very difficult for me to accept their limitations when it came to incurable long-term conditions and then to accept that as a patient I had capacity myself to help my conditions and situation. Having studied medicine at a very academic university, I had a very strict perception of knowledge. Knowledge was hard and fast medical facts that were taught in a formal setting. I worked all day and night learning the anatomical names for all the muscles in the eye, the cranial nerves and citric acid cycle, not to mention the pharmacology in second year. Being immersed in that academic scientific environment, I correlated expertise with PhDs and papers. It was a real challenge to realise that knowledge doesn't always have to be acquired through a formal educational but that it can be acquired through experience. Importantly, knowledge acquired through experience is equally valid! This means the knowledge my clinicians have developed through studying and working is as valid as my knowledge of my conditions, symptoms and triggers, developed through experiencing it day in day out. I used to feel cross about 'expert patients' - I have spent all these hours in a library learning the biochemistry and pharmacology and 'Joe Bloggs' walks in and knows it all! That wasn't the right attitude, and wasn't fair on patients. As an expert patient myself now, I have come to understood that we are experts through different means, and in different fields. My clinicians remain experts in the biological aspects on disease, but that's not the full picture. I am an expert in the psychological and social impact of my conditions. All aspects need to be taken into account if I am going to have holistic integrated care - the biopsychosocial model in practice - and that's where shared-decision making comes in. The other concept which is has been shattered since making the transition from medical student to patient is that of routine. In my first rotation, orthopaedics and rheumatology, I lost track within the first week of how many outpatient appointments I sat in on. I didn't really think anything of them - they are just another 15 minute slot of time filled with learning in a very busy day. As a patient, my perspective couldn't be more different. I have one appointment with my consultant a year, and spend weeks planning and preparing, then a month recovering emotionally. Earlier this year I wrote a whole post just about this - The Anatomy of an Appointment. Appointments are routine for you - they are not for us! The concept of routine applies to symptoms too. After my first relapse, I had an emergency appointment with my consultant, and presented with very blurred vision and almost total loss of movement in my hands. That very fact I had requested an urgent appointment suggest how worried I was. My consultants response in the appointment was "there is nothing alarming about your symptoms". I fully appreciate that my symptoms may not have meant I was going to drop dead there and then, and that in comparison to his patients in ICU, I was not as serious. But loosing vision and all use of ones hands at the age of 23 (or any age for that matter) is alarming in my books! I guess he was trying to reassure me, but it didn't come across like that! I have a Chiari malformation (in addition to Postural Orthostatic Tachycardia Syndrome and Elhers-Danlos Syndrome) and have been referred to a neurosurgeon to discuss the possibility of neurosurgery. It is stating the obvious to say that for a neurosurgeon, brain surgery is routine - it's their job! For me, the prospect of even being referred to a neurosurgeon was terrifying, before I even got to the stage of discussing the operation. It is not a routine experience at all! At the moment, surgery is not needed (phew!) but the initial experience of this contact with neurosurgeons illustrates the concept of routines and how much our perspectives differ. As someone with three quite rare and complex conditions, I am invariable met in A&E with comments like "you are so interesting!". I remember sitting in the hospital cafeteria at lunch as a student and literally feasting on the 'fascinating' cases we had seen on upstairs on the wards that morning. "oh you must go and see that really interesting patient with X, Y and Z!" I am so thankful that you all find medicine so interesting - you need that passion and fascination to help you with the ongoing learning and drive to be a doctor. I found it fascinating too! But I no longer find neurology that interesting - it is too close to home. Nothing is "interesting" if you live with it day in day out. No matter what funky things my autonomic nervous may be doing, there is nothing interesting or fascinating about temporary paralysis, headaches and the day to day grind of my symptoms. This post was inspired by NHS Change Day (13th March 2013) - as a patient, I wanted to share these few things with medical students, what I wish I knew when I was where you are now, to help the next generation of doctors become the very best doctors they can. I wish you all the very best for the rest of your studies, and thank you very much for reading! Anya de Iongh www.thepatientpatient2011.blogspot.co.uk @anyadei
Anya de Iongh
over 7 years ago
Great people make mistakes. Unfortunately, medicine is a subject where mistakes are not tolerated. Doctors are supposed to be infallible; or, at least, that is the present dogma. Medical students regularly fall victim to expecting too much of themselves, but this is perhaps not a bad trait when enlisting as a doctor. If it weren’t for mistakes in our understanding, then we wouldn’t progress. Studying a BSc in Anatomy has exposed me to the real world of science – where the negative is just as important as the positive. What isn’t there is just as important as what is. If you look into the history of Anatomy, it truly is a comedy of errors. So, here are three top mistakes by three incredibly influential figures who still managed to be remembered for the right reasons. 3. A Fiery Stare Culprit: Alcmaeon of Croton Go back far enough and you’ll bump into someone called Alcmaeon. Around the 5th century, he was one of the first dissectors – but not an anatomist. Alcmaeon was concerned with human intellect and was desperately searching for the seat of the soul. He made a number of major errors - quite understandable for his time! Alcmaeon insisted that sleep occurs when the blood vessels filled and we wake when they empty. Perhaps the most outrageous today is the fact that he insisted the eyes contained water both fire and water… Don’t be quick to mock. Alcmaeon identified the optic tract, the brain as the seat of the mind (along with Herophilus) and the Eustachian tubes. 2. Heart to Heart Culprit: Claudius Galen Legend has it that Galen’s father had a dream in which an angel/deity visited him and told him that his son would be a great physician. That would have to make for a pretty impressive opening line in a personal statement by today’s standards. Galen was highly influential on modern day medicine and his treatise of Anatomy and healing lasted for over a thousand years. Many of Galen’s mistakes were due to his dissections of animals rather than humans. Unfortunately, dissection was banned in Galen’s day and where his job as physician to the gladiators provided some nice exposed viscera to study, it did not allow him to develop a solid foundation. Galen’s biggest mistake lay in the circulation. He was convinced that blood flowed in a back and forth, ebb-like motion between the chambers of the heart and that it was burnt by muscle for fuel. Many years later, great physician William Harvey proposed our modern understanding of circulation. 1. The Da Vinci Code Culprit: Leonardo Da Vinci If you had chance to see the Royal Collection’s latest exhibition then you were in for a treat. It showcased the somewhat overlooked anatomical sketches of Leonardo Da Vinci. A man renowned for his intelligence and creativity, Da Vinci also turns out to be a pretty impressive anatomist. In his sketches he produces some of the most advanced 3D representations of the human skeleton, muscles and various organs. One theory of his is, however, perplexing. In his sketches is a diagram of the spinal cord……linked to penis. That’s right, Da Vinci was convinced the two were connected (no sexist comments please) and that semen production occurred inside the brain and spinal cord, being stored and released at will. He can be forgiven for the fact that he remarkably corrected himself some years later. His contributions to human physiology are astounding for their time including identification of a ‘hierarchal’ nervous system, the concept of equal ‘inheritence’ and identification of the retina as a ‘light sensing organ’. The list of errors is endless. However, they’re not really errors. They’re signposts that people were thinking. All great people fail, otherwise they wouldn’t be great.
over 6 years ago
http://www.ophthobook.com This lecture covers basic eye anatomy. This is the first 6 minutes of the powerpoint, which can be viewed in its entirety at Ophthobook.com Here we discuss eyelid and external eye structures.
over 6 years ago
I’m sure there are times when all us GPs feel under-appreciated — by our patients, staff, specialist colleagues or society in general. You can’t blame them for sometimes taking us for granted — it’s part of the human condition. People don’t value what they have until they lose it, whether “it” is the ability to walk or a domestic fairy who makes sure there’s always spare toilet paper. It’s a common lament that we can’t be at our own funerals to hear how much we’re loved. Mind you, eulogies are rarely objective and balanced. Nonetheless, it’s a pity we’re not around to hear the praise — deserved or otherwise — that is expressed once we’re gone. The long-serving, somewhat-taken-for-granted GP has a non-fatal way of bringing out the appreciation in his or her patients and staff: moving on. After 10 years of GP-ing in the Noosa hinterland and a lifetime of living in south-east Queensland, I headed south of the border: to northern NSW. The hardest part of the move for me — harder than selling my house in a depressed market, harder than dealing with banks, builders, real estate agents, solicitors and Australia Post, harder even than trying to get rational answers out of my telecommunications company after they cut off my internet and phone prematurely — was telling my patients that I was leaving. I knew many of my patients were very attached. I knew they’d come to me expecting to receive a loyal, life-long partner kind of doctoring, rather than the one-night-stand variety. But I had no idea how difficult it would be to break the “I’m leaving you” news again and again and again. Hard as breaking up a relationship may be, at least you only have to do it once when you leave a romantic partnership. For me, telling patients I was leaving felt a bit like breaking up with hundreds of boyfriends, one after the other after the other. You may interpret this as my being too close to my patients or not close enough to my boyfriends, but the fact is I found the protracted process exhausting, emotionally draining and just plain horrible. The “it’s not you, it’s me” part goes without saying and I know I am far from irreplaceable, but seeing the tears well up in countless eyes because of the words I’ve uttered was enough to break my tender heart. Looking on the bright side, as I am wont to do, if I’d ever felt under-appreciated, I sure don’t now. I received more expressions of gratitude in those last three months than I did in the previous decade. To hear how influential I was in some of my patients’ lives put a warm glow in my battered heart. And as much as it hurt me to see my patients upset, it probably would’ve hurt me more if they’d been completely indifferent to my leaving. However, I did please someone. Mrs L had been trying for years to get her husband to agree to move interstate to be near family. His last remaining excuse was that his multiple complex medical problems meant that he couldn’t possibly leave me, his long-term GP. A grateful Mrs L rang me within hours of my informing them of my impending departure to say: “He’s finally come around. Thank you so much for deciding to leave us.” It’s nice to be appreciated! (This blog post has been adapted from a column first published in Australian Doctor www.australiandoctor.com.au/opinions/the-last-word/the-last-word-on-moving-on- ) Dr Genevieve Yates is an Australian GP, medical educator, medico-legal presenter and writer. You can read more of her work at http://genevieveyates.com/
Dr Genevieve Yates
about 6 years ago
Cranial Nerve 1- Olfaction This patient has difficulty identifying the smells presented. Loss of smell is anosmia. The most common cause is a cold (as in this patient) or nasal allergies. Other causes include trauma or a meningioma affecting the olfactory tracts. Anosmia is also seen in Kallman syndrome because of agenesis of the olfactory bulbs. Cranial Nerve 2- Visual acuity This patientâs visual acuity is being tested with a Rosenbaum chart. First the left eye is tested, then the right eye. He is tested with his glasses on so this represents corrected visual acuity. He has 20/70 vision in the left eye and 20/40 in the right. His decreased visual acuity is from optic nerve damage. Cranial Nerve II- Visual field The patient's visual fields are being tested with gross confrontation. A right sided visual field deficit for both eyes is shown. This is a right hemianopia from a lesion behind the optic chiasm involving the left optic tract, radiation or striate cortex. Cranial Nerve II- Fundoscopy The first photograph is of a fundus showing papilledema. The findings of papilledema include 1. Loss of venous pulsation 2. Swelling of the optic nerve head so there is loss of the disc margin 3. Venous engorgement 4. Disc hyperemi 5. Loss of the physiologic cup an 6. Flame shaped hemorrhages. This photograph shows all the signs except the hemorrhages and loss of venous pulsations. The second photograph shows optic atrophy, which is pallor of the optic disc resulting form damage to the optic nerve from pressure, ischemia, or demyelination. Images Courtesy Dr. Kathleen Digre, University of Uta Cranial Nerves 2 & 3- Pupillary Light Refle The swinging flashlight test is used to show a relative afferent pupillary defect or a Marcus Gunn pupil of the left eye. The left eye has perceived less light stimulus (a defect in the sensory or afferent pathway) then the opposite eye so the pupil dilates with the same light stimulus that caused constriction when the normal eye was stimulated. Video Courtesy of Dr.Daniel Jacobson, Marshfield Clini and Dr. Kathleen Digre, University of Uta Cranial Nerves 3, 4 & 6- Inspection & Ocular Alignmen This patient with ocular myasthenia gravis has bilateral ptosis, left greater than right. There is also ocular misalignment because of weakness of the eye muscles especially of the left eye. Note the reflection of the light source doesn't fall on the same location of each eyeball. Video Courtesy of Dr.Daniel Jacobson, Marshfield Clini and Dr. Kathleen Digre, University of Uta Cranial Nerves 3, 4 & 6- Versions • The first patient shown has incomplete abduction of her left eye from a 6th nerve palsy. • The second patient has a left 3rd nerve palsy resulting in ptosis, dilated pupil, limited adduction, elevation, and depression of the left eye. Second Video Courtesy of Dr.Daniel Jacobson, Marshfield Clini and Dr. Kathleen Digre, University of Uta Cranial Nerves 3, 4 & 6- Duction Each eye is examined with the other covered (this is called ductions). The patient is unable to adduct either the left or the right eye. If you watch closely you can see nystagmus upon abduction of each eye. When both eyes are tested together (testing versions) you can see the bilateral adduction defect with nystagmus of the abducting eye. This is bilateral internuclear ophthalmoplegia often caused by a demyelinating lesion effecting the MLF bilaterally. The adduction defect occurs because there is disruption of the MLF (internuclear) connections between the abducens nucleus and the lower motor neurons in the oculomotor nucleus that innervate the medial rectus muscle. Saccades Smooth Pursui The patient shown has progressive supranuclear palsy. As part of this disease there is disruption of fixation by square wave jerks and impairment of smooth pursuit movements. Saccadic eye movements are also impaired. Although not shown in this video, vertical saccadic eye movements are usually the initial deficit in this disorder. Video Courtesy of Dr.Daniel Jacobson, Marshfield Clini and Dr. Kathleen Digre, University of Utah Optokinetic Nystagmu This patient has poor optokinetic nystagmus when the tape is moved to the right or left. The patient lacks the input from the parietal-occipital gaze centers to initiate smooth pursuit movements therefore her visual tracking of the objects on the tape is inconsistent and erratic. Patients who have a lesion of the parietal-occipital gaze center will have absent optokinetic nystagmus when the tape is moved toward the side of the lesion. Vestibulo-ocular refle The vestibulo-ocular reflex should be present in a comatose patient with intact brainstem function. This is called intact "Doll’s eyes" because in the old fashion dolls the eyes were weighted with lead so when the head was turned one way the eyes turned in the opposite direction. Absent "Doll’s eyes" or vestibulo-ocular reflex indicates brainstem dysfunction at the midbrain-pontine level. Vergenc Light-near dissociation occurs when the pupils don't react to light but constrict with convergence as part of the near reflex. This is what happens in the Argyll-Robertson pupil (usually seen with neurosyphilis) where there is a pretectal lesion affecting the retinomesencephalic afferents controlling the light reflex but sparing the occipitomesencephalic pathways for the near reflex. Video Courtesy of Dr.Daniel Jacobson, Marshfield Clini and Dr. Kathleen Digre, University of Uta Cranial Nerve 5- Sensor There is a sensory deficit for both light touch and pain on the left side of the face for all divisions of the 5th nerve. Note that the deficit is first recognized just to the left of the midline and not exactly at the midline. Patients with psychogenic sensory loss often identify the sensory change as beginning right at the midline. Cranial Nerves 5 & 7 - Corneal refle A patient with an absent corneal reflex either has a CN 5 sensory deficit or a CN 7 motor deficit. The corneal reflex is particularly helpful in assessing brainstem function in the unconscious patient. An absent corneal reflex in this setting would indicate brainstem dysfunction. Cranial Nerve 5- Motor • The first patient shown has weakness of the pterygoids and the jaw deviates towards the side of the weakness. • The second patient shown has a positive jaw jerk which indicates an upper motor lesion affecting the 5th cranial nerve. First Video Courtesy of Alejandro Stern, Stern Foundation Cranial Nerve 7- Motor • The first patient has weakness of all the muscles of facial expression on the right side of the face indicating a lesion of the facial nucleus or the peripheral 7th nerve. • The second patient has weakness of the lower half of his left face including the orbicularis oculi muscle but sparing the forehead. This is consistent with a central 7th or upper motor neuron lesion. Video Courtesy of Alejandro Stern, Stern Foundatio Cranial Nerve 7- Sensory, Tast The patient has difficulty correctly identifying taste on the right side of the tongue indicating a lesion of the sensory limb of the 7th nerve. Cranial Nerve 8- Auditory Acuity, Weber & Rinne Test This patient has decreased hearing acuity of the right ear. The Weber test lateralizes to the right ear and bone conduction is greater than air conduction on the right. He has a conductive hearing loss. Cranial Nerve 8- Vestibula Patients with vestibular disease typically complain of vertigo – the illusion of a spinning movement. Nystagmus is the principle finding in vestibular disease. It is horizontal and torsional with the slow phase of the nystagmus toward the abnormal side in peripheral vestibular nerve disease. Visual fixation can suppress the nystagmus. In central causes of vertigo (located in the brainstem) the nystagmus can be horizontal, upbeat, downbeat, or torsional and is not suppressed by visual fixation. Cranial Nerve 9 & 10- Moto When the patient says "ah" there is excessive nasal air escape. The palate elevates more on the left side and the uvula deviates toward the left side because the right side is weak. This patient has a deficit of the right 9th & 10th cranial nerves. Video Courtesy of Alejandro Stern, Stern Foundatio Cranial Nerve 9 & 10- Sensory and Motor: Gag Refle Using a tongue blade, the left side of the patient's palate is touched which results in a gag reflex with the left side of the palate elevating more then the right and the uvula deviating to the left consistent with a right CN 9 & 10 deficit. Video Courtesy of Alejandro Stern, Stern Foundation Cranial Nerve 11- Moto When the patient contracts the muscles of the neck the left sternocleidomastoid muscle is easily seen but the right is absent. Looking at the back of the patient, the left trapezius muscle is outlined and present but the right is atrophic and hard to identify. These findings indicate a lesion of the right 11th cranial nerve. Video Courtesy of Alejandro Stern, Stern Foundation Cranial Nerve 12- Moto Notice the atrophy and fasciculation of the right side of this patient's tongue. The tongue deviates to the right as well because of weakness of the right intrinsic tongue muscles. These findings are present because of a lesion of the right 12th cranial nerve.
over 9 years ago
In this episode, I talk about the visual processing that happens in the retina, starting with the rods and cones, going to the bipolar cells and then the ganglion cells. Watch to learn how this process works.
about 6 years ago
In the initial interviews with patients who suffer psychotic symptoms, it might be striking that the usage of terminology of descriptive psychopathology lingers on an arbitration of knowledge of 'truth' by using terms like delusions or hallucinations with their definition as false beliefs or false perceptions (Casey & Kelly 2007). These terms can cause annihilation of value to patient's experience, which may pose an initial strain on the egalitarian patient-doctor relationship. In an era, where deference to experts is dead, it might be worthy on agreeing on the effect of these experiences prior to lablelling them. Delusions can not be objectively detected and described, because it evolves and exists within subjective and interpersonal dimensions. Severe psycopathological symptoms share the fact that they are statistically deviant, and thus can be labeled as 'unshared'. Symptoms may be perceived as 'distressing' and they might be 'disabling' to them. The outcome behaviour which may raise concern can be a 'dysfunctional' behaviour (Adams & Sutker 2004). Jaspers considered the lack of understandability of how the patient reached conclusion to be the defining factor of a delusional idea. The notion of defining 'delusion' as false belief was challenged by Jaspers. Sims gives the example of a man who believed his wife was unfaithful to him because the fifth lamp-post alone on the left was unlit. What makes it a delusion is the methodology not the conclusion which may be right (Sims 1991). Some delusions might be mundane in their content, others may not be falsifiable. Dereistic thinking is not based on logic but rather on feelings. It is possible to find ways to evade falsification; an ad hoc hypotheses may also be part of the presentation. Fish stated that delusional elaboration may follow delusion and/or hallucination which may have convergence with the concept of the ad hoc hypothesis. Absence of verification from the patient's side does not lead to deductive falsification (Casey & Kelly 2007). Otherwise, the doctor-patient relationship carry the risk to transform to detective-suspect relationship, where the latter may perceive the need to present evidence of innocence. Mental health professionals are usually encountered by people who suffer to various degrees or make others suffer, and not because of various degrees of conviction. The primary role of the therapist is to be defined as some one who tries to alleviate the sufferings of others rather than correcting their beliefs. Communicating with patients in terms of how functional is their belief rather than it's truth may prove to be more egalitarian and clinically tuned. This may provide some middle ground in communication, without having to put an effort on defining the differences between what is 'true' and what is 'real'. The criterion for demarcation between what is real and what is pathologic may be different in the patient-doctor relationship. The assertion on the clinician's part on the falsity of a belief or experience can have the risk of dogmatism. The statistical deviance of symptoms, their distressing nature, disabling consequences, the resultant dysfunctional behaviour and apparent leap from evidence to conclusion may be a more agreeable surrogate starting points. This might be more in line with essence of medicine or 'ars medicina' (art of healing). Concordance with patients on their suffering may serve as an egalitarian platform prior to naming the symptoms. The term delusion commonly identified as false fixed belief, when used by a psychiatrist, it does not address only a symptom. It rather puts the interviewer in the position of an all knowing judge. After all, a service-user may argue that how come a doctor who never encountered or experienced any of the service-user's aspects of the problem as being persecuted at work and home, as plainly false. Then, does the psychiatrist know the truth. From a service-user point of view what he/she experience is real; which might not necessarily be true. The same applies for people who lead an average life, people who go to work bearing with them their superstitions, beliefs about ghosts, luck, horoscopes, zodiacs, or various revered beliefs. This term has the risk of creating a temporary crack in the mutual sense of equality between the therapist and the service-user. This may be due to the labelling of certain dysfunctional belief as unreal by one side. It has the potential for a subtle change in the relationship to the mental health professional placing himself/herself in the omniscient position and it contrasts with the essence of medical practice where practitioners assume the truth in what the patients say as in the rest of subjective symptoms as headache for example. The subsequent sequel of this is other labels such as 'bizarre delusions' or 'systematised delusions', further add to the deviation of the role of the professional therapist to an investigator in the domain of 'Truth' and architecture of 'Truth'. Furthermore, it might be strenuous to the relationship when the therapist - based on skeptic enquiry - starts explaining such symptoms. For example, if the service-user believes that Martians have abducted him, implanted a device in his brain and sent him/her back to earth, and the response communicated back is the 'delusional'. It could be argued by the service-user that the therapist who had not seen a Martian or a brain device before, labelled the whole story as 'delusion' in a rather perceived dismissive labelling with no intention to check on the existence of Martians or the device. In other words, the healer became the arbiter of truth, where both lack evidence for or against the whole thing; one member in the relationship stepped into power on basis of subjective view of plausibility or lack of thereof. In the case of hallucinations, the clinician labelling the patient's experience as hallucinations can be imposing fundamental dilemma for the patient. For example, if a patient hears a voice that says that everything is unreal apart from the voice, and the clinician says that the voice is the thing that is unreal. Both do not give evidence to their 'truth' apart from their statement. The clinician's existence to the patient's subjective reality is distorted by the multiple realities of the patient, and arguing on basis of mere existence that the 'voice' is the one that is 'false', does not give the patient a clue of the future methodology to discern from both, since percetption is deceived and/or distorted. In this case, another tool of the mind can be employed to address the patient. The same can be applied to a concept like 'over valued ideas', where the clinician decides that this particular idea is 'over valued', or that this 'idea' is 'over valued' in a pathological way. The value put on these ideas or not the patient values but the clinician's evaulation of 'value' and 'pathology'. The cut of point of 'value' and 'over value' seems to be subjective from the clinician's perspective. Also, 'derailment' pauses the notion of expecting a certain direction of talk. The concepts of 'grooming' and 'eye contact' implicitly entail the reference to a socio-cultural normative values. Thus, deviation from the normative value is reflected to the patient as pathology, which is an ambiguous definition, in comparison to the clarity of pathology. The usage of terms like 'dysfunctional unshared belief' or 'distressing auditory perception' or other related terms that address the secondary effect of a pathologic experience may be helpful to engage with the patient, and may be more logically plausible and philosophically coherent yet require empirical validation of beneficence. Taylor and Vaidya mention that it is often helpful to normalise, but this is not to minimise or be dismissive of patient's delusional beliefs.(Taylor & Vaidya 2009). The concept can be extended to cover other terms such as 'autistic thinking, 'apathy', 'blunting of affect', 'poor grooming', 'over-valued ideas', other terms can be applied to communicate these terms with service-users with minimal deviation from the therapeutic relationship. The limitation of these terms in communication of psychopathology are special circumstances as folie a deux, where a dysfunctional belief seems to be shared with others Also, symptoms such as Charles-Bonnet syndrome; usually does not have negative consequences. The proposed terms are not intended for use as a replacement to well carved descriptive psychopathological terms. Terms like 'delusion' or 'hallucination' are of value in teaching psychopathology. However in practice, meaningful egalitarian communication may require some skill in selecting suitable terms that is more than simplifying jargon. They also may carry the burden of having to add to the psychiatric terminology with subsequent effort in learning them. They can also be viewed as 'euphemism' or 'tautology'. However, this has been the case from 'hysteria' to 'medically unexplained symptoms' which seems to match with the zeitgeist of an era where 'Evidence Based Medicine' is its mantra; regardless advances in treatment. Accuracy of terminology might be necessary to match with essence of scientific enquiry; systematic observation and accurate taxonomy. The author does not expect that such proposal would be an easy answer to difficulties in communication during practice. This article may open a discussion on the most effective and appropriate terms that can be used while communicating with patients. Also, it might be more in-line with an egalitarian approach to seek to the opinion of service-users and professional bodies that represent the opinions of service-users. Empirical validation and subjection of the concept to testing is necessary. Patient's care should not be based on logic alone but rather on evidence. Despite the limitations of such proposal with regards to completeness, it's hoped that the introduction of any term may help to add to the main purpose of any classification or labelling that is accurate egalitarian communication. DISCLAIMER This blog is adapted from BMJ doc2doc clinical blogs Philosophical Streamlining of Psychopathology and its Clinical Implications http://doc2doc.bmj.com/blogs/clinicalblog/_philosophical-streamlining-of-psychopathology-its-clinical-implications The blog is based on an article named 'Towards a More Egalitarian Approach to Communicating Psychopathology' which is published in the Journal of Ethics in Mental Health, 2013 http://www.jemh.ca/issues/v8/documents/JEMHVol8Insight_TowardsaMoreEgalitarianApproachtoCommunicatingPsychopathology.pdf Bibliography Adams, H. E., Sutker P.B. (2004). Comprehensive Handbook of Psychopathology. New York: Springer Science Casey, P., Kelly B., (2007). Fish's Clinical Psychopathology: Signs and Symptoms in Psychiatry, Glasgow: Bell & Bain Limited Kingdon and Turkington (2002), The case study guide to congitive behavior therapy for psychosis, Wiley Kiran C. and Chaudhury S. (2009). Understanding delusion, Indian Journal of Psychiatry Maddux and Winstead (2005). Psychopathology foundations for a contemporary understanding, Lawrence Erlbaum Associates Inc. Popper (2005) The logic of scientific discovery, Routledge, United Kingdom Sidhom, E. (2013) Towards a More Egalitarian Approach to Communicating Psychopathology, JEMH · 2013· 8 | 1 © 2013 Journal of Ethics in Mental Health (ISSN: 1916-2405) Sims A., Symptoms in the mind, (1991) an introduction to psychopathology, Baillere Tindall Taylor and Vaidya (2009), Descriptive psychopathology, the signs and symptoms of behavioral disorders, Cambridge university press
Dr Emad Sidhom
over 6 years ago
So you're sitting in a bus when you see a baby smile sunnily and gurgle at his mother. Your automatic response? You smile too. You're jogging in the park, when you see a guy trip over his shoelaces and fall while running. Your knee jerk reaction? You wince. Even though you're completely fine and unscathed yourself. Or, to give a more dramatic example; you're watching Titanic for the umpteenth time and as you witness Jack and Rose's final moments together, you automatically reach for a tissue and wipe your tears in whole hearted sympathy ( and maybe blow your nose loudly, if you're an unattractive crier like yours truly). And here the question arises- why? Why do we experience the above mentioned responses to situations that have nothing to do with us directly? As mere passive observers, what makes us respond at gut level to someone else's happiness or pain, delight or excitement, disgust or fear? In other words, where is this instinctive response to other people's feelings and actions that we call empathy coming from? Science believes it may have discovered the answer- mirror neurons. In the early 1990s, a group of scientists (I won't bore you with the details of who, when and where) were performing experiments on a bunch of macaque monkeys, using electrodes attached to their brains. Quite by accident, it was discovered that when the monkey saw a scientist holding up a peanut, it fired off the same motor neurons in its brain that would fire when the monkey held up a peanut itself. And that wasn't all. Interestingly, they also found that these motor neurons were very specific in their actions. A mirror neuron that fired when the monkey grasped a peanut would also fire only when the experimenter grasped a peanut, while a neuron that fired when the monkey put a peanut in its mouth would also fire only when the experimenter put a peanut in his own mouth. These motor neurons came to be dubbed as 'mirror neurons'. It was a small leap from monkeys to humans. And with the discovery of a similar, if not identical mirror neuron system in humans, the studies, hypotheses and theories continue to build. The strange thing is that mirror neurons seem specially designed to respond to actions with clear goals- whether these actions reach us through sight, sound, smell etc, it doesn't matter. A quick example- the same mirror neurons will fire when we hop on one leg, see someone hopping, hear someone hopping or hear or read the word 'hop'. But they will NOT respond to meaningless gestures, random or pointless sounds etc. Instead they may well be understanding the intentions behind the related action. This has led to a very important hypothesis- the 'action understanding' ability of mirror neurons. Before the discovery of mirror neurons, scientists believed our ability to understand each other, to interpret and respond to another's feeling or actions was the result of a logical thought process and deduction. However, if this 'action understanding' hypothesis is proved right, then it would mean that we respond to each other by feeling, instead of thinking. For instance, if someone smiles at you, it automatically fires up your mirror neurons for smiling. They 'understand the action' and induce the same sensation within you that is associated with smiling. You don't have to think about what the other person intends by this gesture. Your smile flows thoughtlessly and effortlessly in return. Which brings us to yet another important curve- if mirror neurons are helping us to decode facial expressions and actions, then it stands to reason that those gifted people who are better at such complex social interpretations must be having a more active mirror neuron system.(Imagine your mom's strained smile coupled with the glint in her eye after you've just thrown a temper tantrum in front of a roomful of people...it promises dire retribution my friends. Trust me.) Then does this mean that people suffering from disorders such as autism (where social interactions are difficult) have a dysfunctional or less than perfect mirror neuron system in some way? Some scientists believe it to be so. They call it the 'broken mirror hypothesis', where they claim that malfunctioning mirror neurons may be responsible for an autistic individual's inability to understand the intention behind other people's gestures or expressions. Such people may be able to correctly identify an emotion on someone's face, but they wouldn't understand it's significance. From observing other people, they don't know what it feels like to be sad, angry, surprised or scared. However, the jury is still out on this one folks. The broken mirror hypothesis has been questioned by others who are still skeptical about the very existence of these wonder neurons, or just how it is that these neurons alone suffered such a developmental hit when the rest of the autistic brain is working just dandy? Other scientists argue that while mirror neurons may help your brain to understand a concept, they may not necessarily ENCODE that concept. For instance, babies understand the meaning behind many actions without having the motor ability to perform them. If this is true, then an autistic person's mirror neurons are perfectly fine...they were just never responsible for his lack of empathy in the first place. Slightly confused? Curious to find out more about these wunderkinds of the human brain? Join the club. Whether you're an passionate believer in these little fellas with their seemingly magical properties or still skeptical, let me add to your growing interest with one parting shot- since imitation appears to be the primary function of mirror neurons, they might well be partly responsible for our cultural evolution! How, you ask? Well, since culture is passed down from one generation to another through sharing, observation followed by imitation, these neurons are at the forefront of our lifelong learning from those around us. Research has found that mirror neurons kick in at birth, with infants just a few minutes old sticking their tongues out at adults doing the same thing. So do these mirror neurons embody our humanity? Are they responsible for our ability to put ourselves in another person's shoes, to empathize and communicate our fellow human beings? That has yet to be determined. But after decades of research, one thing is for sure-these strange cells haven't yet ceased to amaze and we definitely haven't seen the last of them. To quote Alice in Wonderland, the tale keeps getting "curiouser and curiouser"!
over 6 years ago
This vodcast is one in a series developed by Dundee PRN, a student lead initiative providing an online medical student network for Dundee. This vodcast provides an overview of the muscles of the eye, for example, how the superior rectus moves the eye down and in via the trochlear and relevant pathology. This video serves as a stand alone piece of learning but can also be re-used in a number of learning contexts and embedded into other learning resources.
about 9 years ago
I'm not sure why I like to quote lines from films on this blog. I mean, I really haven't seen enough of them to make myself out to be some sort of hotshot film geek. I'm hoping this is the last (probably inappropriate) quote I use for a while, so here goes... 'Give me a word, any word, and I show you that the root of that word is Greek.' Courtesy of Gus Portokalos, the funniest character in the My Big Fat Greek Wedding. Sometimes I feel like medics tend to do that, we have a habit of making absolutely any conversation about Medicine. It seems to give us a bit of a bad rep, but surely it's understandable? I mean, it's what we do. It's what we've 'always wanted to do' i.e. since leaving the womb*. It's what we're always going to do. Right? Even so, it's surely human nature to relate everyday conversation to something you think that you know a lot about. Let's take a look at real-life example, cue the Blue Peter quip 'here's one I made earlier': I know nothing about football. Well, I know a bit more than some and a lot less than your average football fan so I guess I know VERY little about football. I do, however, know a thing or two about Hillsborough Stadium in Sheffield. Why, you ask? Well, the Hillsborough Disaster in 1985 saw the deaths of 96 Liverpool fans during an FA cup semi-final. A pivotal case emerged from this disaster which affected medical decision-making at the end of life, that of Anthony Bland. Bland was left brain damaged and in a 'persistent vegetative state' (a disorder of consciousness) after the disaster. In 1993, he finally won his battle to have the treatment that was keeping him alive withdrawn. This was a landmark case in both medical ethics and law. Don't say you heard it hear first, look it up: it's relevant. It would be dishonest to say, 'Give me a word, any word, and I'll show you that it's somehow linked to Medicine. But just ask me what I know about football, just once and I might just surprise you. *After writing this entry, I realised that it might be unfair to presume that there isn't at least one person who knew that they wanted to be a doctor just seconds after taking their first gasp of air and crying their eyes out in the midwife's arms. My sincere apologies if this applies to you. (To have a look at more of my entries, visit: http://contemplationsofamedic.blogspot.co.uk/)
over 7 years ago