Repeated episodes of hypoglycaemia were observed in two girls with spi
nal muscular atrophy. During a 12 h fast blood glucose fell to 3.4 and
2.7 mmol/L, respectively. One girl developed hypoglycaemia and ketonu
ria. Reduced gluconeogenesis was probably the cause of hypoglycaemia i
n these patients who had a muscle mass of about 10% of bodyweight (nor
mal 30-40%). Hypoglycaemia must be suspected and treated when patients
with severe muscle wasting due to chronic neuromuscular disorders are
admitted comatose. In our experience this condition is often regarded
as respiratory insufficiency.