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Hypoglycaemia in spinal muscular atrophy

A K Bruce¹, E Jacobsen, H Dossing

¹Department of Infectious Diseases, Rigshospitalet, Copenhagen, Denmark.

Lancet (London, England)

|September 2, 1995

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Children with spinal muscular atrophy (SMA) may experience dangerous low blood sugar (hypoglycemia) due to reduced glucose production. This condition requires prompt recognition and treatment in comatose patients with severe muscle wasting.

Area of Science:

Neurology
Endocrinology
Metabolic Disorders

Background:

Spinal muscular atrophy (SMA) is a severe genetic neuromuscular disorder characterized by progressive muscle wasting.
Impaired muscle mass can significantly affect metabolic processes, including glucose regulation.
Patients with chronic neuromuscular disorders are at risk for metabolic complications.

Observation:

Two young female patients with SMA presented with recurrent episodes of hypoglycemia.
During a 12-hour fast, blood glucose levels dropped significantly (3.4 and 2.7 mmol/L).
One patient developed both hypoglycemia and ketonuria, indicating impaired fat metabolism.

Findings:

Reduced gluconeogenesis (glucose production by the liver) is the likely cause of hypoglycemia in these SMA patients.

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The patients had significantly reduced muscle mass (approximately 10% of body weight, compared to normal 30-40%).

Severe muscle wasting in SMA compromises the body's ability to maintain adequate glucose levels.

Implications:

Hypoglycemia should be suspected and treated in comatose patients with severe muscle wasting due to chronic neuromuscular disorders like SMA.
This metabolic complication may be misdiagnosed as respiratory insufficiency, highlighting the need for increased clinical awareness.
Early detection and management of hypoglycemia are crucial for improving outcomes in patients with severe muscle atrophy.