New to Meducation?
Sign up
Already signed up? Log In

Category

Preview
1
7

Stoma Care. Reasons for Stomas discussed in Stoma Care | Patient

With Stoma Care an ostomy is a surgically made opening from the inside of an organ to the outside. Stoma is the Greek for mouth or opening, learn about Stoma Care  
Patient.co.uk
over 5 years ago
Preview
7
532

Embryology of the Head and Neck - Chapter 2: Embryology of the Head, Face and Oral Cavity

Diagrammatic representation of the development of the head and neck region for undergraduate students, particularly Oral Biology. The module is available thr...  
YouTube
over 5 years ago
Preview
2
258

Applied Anatomy of Submandibular Salivary Gland - Epomedicine

Synonyms: Submaxillary gland (SMG), Mandibular gland Definition: Submandibular glands are one of the major salivary glands comprised of mixed serous and mucous acini and located below the lower border of the ...  
epomedicine.com
over 5 years ago
Foo20151013 2023 1nftkgk?1444774218
4
300

Gin & Tonic Anyone?

It was a Saturday, about tea-time in the quaint village of Athelstaneford, East Lothian. Mrs Alexandria Agutter sat in her cottage, enjoying the delights of the late-summer evening with a glass of gin and tonic. She listlessly sipped from the rather generous pick-me up, no doubt chewing over the happenings of the day. Blast! The taste was much too bitter to her liking. She stood up. And promptly crumpled to the floor in a dizzied heap. It had not been five minutes when a fiery pain gripped her parched throat and in her frenzied turn she watched the bleary room become draped in a gossamery silk. How Dame Agatha would approve. But this is no crime novel, on that fateful day, 24th August 1994, poor Mrs Agutter immortalised herself in the history books of forensic medicine; she was the victim of a revered toxin and a vintage one it was too. She had unwittingly imbibed a G&T laced with a classic poison of antiquity. A clue from the 21st century: do you recall the first Hunger Games film adaption? Those inviting purple-black berries or as Suzanne Collins coined them ‘Nightlock’; a portmanteau of hemlock and Deadly Nightshade. True to the laters’ real life appearance those onscreen fictional fruits played a recurring cameo role. Deadly Nightshade is a perennial shrub of the family Solanaceae and a relative of the humble potato (a member of the Solanus genus). It is a resident of our native woodland and may be found as far afield as Europe, Africa and Western Asia. The 18th century taxonomist, Carl Linnaeus gave the plant an intriguing name in his great Species Plantarum. The genus Atropa is aptly named after one of the three Greek Fates, Atropos. She is portrayed shearing the thread of a mortal’s life so determining the time and manner of its inevitable end. The Italian species name belladona (beautiful woman) refers to the striking mydriatic effect of the plant on the eye. The name pays homage to Pietro Andre Mattioli, a 16th century physician from Sienna, who was allegedly the first to describe the plant’s use among the Venetian glitterati - ladies of fashion favoured the seductive, doe-eyed look. Belladona is poisonous in its entirety. It was from the plant’s roots in 1831, the German apothecary Heinrich F. G. Mein isolated a white, odourless, crystalline powder: it was (surprise, surprise) atropine. Atropine is a chiral molecule. From its natural plant source it exists as a single stereoisomer L-atropine, which also happens to display a chiral potency 50-100 times that of its D-enantiomer. As with many other anaesthetic agents it is administered as a racemic mixture. How strange that atropine now sits among the anaesthetist’s armamentarium, its action as a competitive antimuscarinic to counter vagal stimulation belies its dark history. It was a favourite of Roman housewives seeking retribution against their less than faithful husbands and a staple of the witch’s potion cupboard. Little wonder how belladona became known as the Devil’s plant. Curiouser still it’s also the antidote for other poisons, most notably the organophosphates or nerve gases. On account of its non-selective antagonism, atropine produces a constellation of effects: the inhibition of salivary, lacrimal and sweat glands occurs at low doses; dry mouth and skin are early markers. Pyrexia is a central effect exacerbated by the inability to sweat. Flushing of the face due to skin vessel vasodilatation. Low parasympathetic tone causes a moderate sinus tachycardia. Vision is blurred as the eye becomes dilated, unresponsive to light and accommodation is impaired. Mental disorientation, agitation and ataxia give the impression of drunkedness or a delirium tremens like syndrome. Visual hallucinations, often of butterflies or silk blowing in the wind, are a late feature. It was then that Mr Agutter, seemingly untroubled by the sight of his wife’s problematic situation, proceeded to leave a message with the local practitioner. How fortunate they were to have the vigilant locum check the answering machine and come round to the Agutter’s lodge accompanied by an ambulance crew. The attending paramedic had the presence of mind to pour the remainder of Mrs Agutter’s beverage into a nearby jam jar, while Mr Agutter handed over what he suspected to be the offending ingredient: the bottle of Indian tonic water. As it soon transpired there were seven other casualties in the surrounding countryside of East Lothian – all involving an encounter with tonic water. In fact by some ironic twist of fate, two of the victims were the wife and son of Dr Geoffry Sharwood-Smith, a consultant aneasthetist. Obviously very familiar with the typical toxidrome of anticholinergic agents, he was quick to suspect atropine poisoning. Although for a man of his position with daily access to a sweetshop of drugs, it was not something to draw attention to. Through no small amount of cunning had the poisoner(s) devised the plan. It was elegant; atropine is very bitter. So much so that it can be detected at concentrations of 100 parts per million (0.001%). Those foolish enough to try the berries of belladonna during walks in the woods are often saved by the berry’s sour taste. They are soon spat out. But the quinine in the tonic water was a worthy disguise. The lethal dose for an adult is approximately 90-130mg, however atropine sensitivity is highy variable. In its salt form, atropine sulfate, it is many times more soluble: >100g can be dissolved in 100ml of water. So 1ml may contain roughly tenfold the lethal dose. There ensued a nationwide scare; 50 000 bottles of Safeway branded Indian tonic water were sacrificed. Only six bottles had been contaminated. They had all been purchased, tops unsealed, from the local Safeway in Hunter’s Tryst. Superficially this looked like the handiwork of a psychopath with a certain distaste for the supermarket brand, and amidst the media furore, it did have some verisimilitude: one of the local papers received a letter from 25 year old, Wayne Smith admitting himself as the sole perpetrator. The forensic scientist, Dr Howard Oakley analysed the contents of the bottles. They all contained a non-lethal dose, 11-74mg/litre of atropine except for the Agutter’s, it contained 103mg/litre. The jam jar holding Mrs Agutter’s drink bore even more sinister results, the atropine concentration was 292mg/L. It would appear Mrs Agutter had in some way outstayed her welcome. But she lived. A miscalculation on the part of the person who had added an extra seasoning of atropine to her drink. According to the numbers she would have had to swallow a can’s worth (330ml) to reach the lethal dose. Thankfully she had taken no more than 50mg. The spotlight suddenly fell on Dr Paul Agutter. He was a lecturer of biochemistry at the nearby University of Napier, which housed a research syndicate specialising in toxicology. CCTV footage had revealed his presence at the Safeway in Hunter’s Tryst and there was eye witness evidence of him having placed bottles onto the shelves. Atropine was also detected by the forensic investigators on a cassete case in his car. Within a matter of two weeks he would be arrested for the attempted murder of his wife. Despite the calculated scheme to delay emergency services and to pass the blame onto a non-existent mass poisoner, he had not accomplished the perfect murder. Was there a motive? Allegedly his best laid plans were for the sake of a mistress, a mature student from Napier. He served seven years of a twelve year sentence. Astonishingly, upon his release from Glenochil prison in 2002, he contacted his then former wife proclaiming his innocence and desire to rejoin her in their Scottish home. A proposition she was not very keen on. Dr Agutter was employed by Manchester University as a lecturer of philosophy and medical ethics. He is currently an associate editor of the online journal Theoretical Biology and Medical Modelling. We will never know the true modus operandi as Dr Agutter never confessed to the crime. Perhaps all this story can afford is weak recompense for the brave followers of the Dry January Campaign. Oddly these sort of incidents never appear in their motivational testimonials. Acknowledgements Emsley J. Molecules of Murder. 2008, Cambridge, RSC Publishing, p.46-67. Lee MR. Solanaceae IV: Atropa belladona, deadly nightshade. J R Coll Physicians Edinb. March 2007; 37: 77-84. Illustrator Edward Wong This blog post is a reproduction of an article published in the The Medical Student Newspaper January issue, 2014 http://www.themedicalstudent.co.uk/  
James Wong
over 6 years ago
Foo20151013 2023 e2a8vo?1444774258
7
294

Monkey See, Monkey Do.

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"!  
Huda Qadir
over 6 years ago
Preview
0
2

Scientists identify mutation associated with cleft palate in humans and dogs

Scientists studying birth defects in humans and purebred dogs have identified an association between cleft lip and cleft palate - conditions that occur when the lip and mouth fail to form...  
medicalnewstoday.com
over 5 years ago
Preview
0
1

Complications of tube insertion in ears not worse for kids with cleft lip/palate

Children with cleft lip and/or palate (CLP) have no worse complications from ventilation tube (VT) insertion in their ears to treat otitis media with effusion (OME, a buildup of fluid in the...  
medicalnewstoday.com
over 5 years ago
Preview
0
2

New gene responsible for cleft lip and palate syndrome identified

An international team led by researchers from Karolinska Institutet in Sweden has identified a new gene related to the Van der Woude syndrome, the most common syndrome with cleft lip and palate.  
medicalnewstoday.com
over 5 years ago
Preview
0
3

Cleft Lip/Palate Cause Much More Than Cosmetic Problems

Children born with cleft lip, cleft palate and other craniofacial disorders face numerous medical challenges beyond appearance.  
medicalnewstoday.com
over 5 years ago
Preview
0
9

Two Brothers Born With Forms Of Cleft Lip And Palate Raises Awareness Of Condition And Risk Factors

Carter and Mason Osborne have a lot in common. Not only are they brothers who love to laugh, they also share one unique characteristic; they were born with forms of cleft lip and palate.  
medicalnewstoday.com
over 5 years ago
Preview
0
2

Cries Of Two-Month-Old Infants With Cleft Lip And Palate Predict Language Development

An infant child's cries are his or her way of communicating with the world. However, the baby's cries have more information to communicate beyond saying 'I'm hungry,' or 'I'm tired.  
medicalnewstoday.com
over 5 years ago
Preview
0
1

Technology Used To Assess How People View Faces With A Cleft Lip And Palate

The impact of physical attractiveness on social communication is a truth universally acknowledged.  
medicalnewstoday.com
over 5 years ago
Preview
0
1

The connection between mouth bacteria and inflammation in heart disease

Oral infections are the most common diseases of mankind and are also a key risk factor for heart disease, which is the leading cause of death worldwide.  
medicalnewstoday.com
over 5 years ago
Preview
0
6

Graphene: A new tool for fighting cavities and gum disease?

Dental diseases, which are caused by the overgrowth of certain bacteria in the mouth, are among the most common health problems in the world.  
medicalnewstoday.com
over 5 years ago
Preview
0
7

Diagnose on Sight: Lip Swelling

Diagnose on Sight: Lip Swelling by Dr. Jeff Riddell. A Master Clinician Bedside Pearls podcast by Dr. Chris Doty discusses this hereditary angioedema case.  
aliem.com
over 5 years ago
Preview
0
29

Bougie Prepassing into the Mouth and CricCon Readiness Level

So my friend, Darren Braude and a colleague had a horrible airway case, which they presented on EM:RAP. I wanted to comment on the case.  
emcrit.org
over 5 years ago
Preview
0
2

How gum disease treatment can prevent heart disease

A new study is helping to shed more light on the important connection between the mouth and heart. According to research, scientists have demonstrated that using an oral topical remedy to reduce inflammation associated with periodontitis, more commonly known as gum disease, also results in the prevention of vascular inflammation and can lower the risk of heart attack.  
sciencedaily.com
over 5 years ago
Preview
0
4

Forsyth study details how gum disease treatment can prevent heart disease

A new study from the Forsyth Institute is helping to shed more light on the important connection between the mouth and heart. According to research recently published online by the American Heart Association, scientists at Forsyth and Boston University have demonstrated that using an oral topical remedy to reduce inflammation associated with periodontitis, more commonly known as gum disease, also results in the prevention of vascular inflammation and can lower the risk of heart attack.  
eurekalert.org
over 5 years ago
Preview
0
8

Why You Shouldn't Laugh at Someone Who Stutters

The bar is packed, and I have to lean across the table to introduce myself. "Hi I'm..." The usual mouth-gapping, eye-opening silence. Followed by the rep...  
huffingtonpost.com
over 5 years ago