A patient with type 2 diabetes and a burning sensation in his feet

A 64 year old man with type 2 diabetes diagnosed nine years earlier attended the outpatient diabetes clinic because of suboptimal diabetes control. His glycated haemoglobin over the past five years had been 64-77 mmol/mol (8-9.2%; optimal value <53 mmol/mol (7%)). He was being treated for diabete...