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Updated: Jul 18, 2026

Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide
Published on: January 30, 2026
[An unusual cause of failure of weaning from mechanical ventilation in an infant]
L Ruiz Pérez1, R Reig Saenz, E Martínez-Salcedo
1Servicio de Pediatría, Hospital General Universitario de Alicante, España. lorearuiz@hotmail.com
Insights
Spinal muscular atrophy (SMA) can cause severe respiratory failure in infants, complicating mechanical ventilation weaning. Early diagnosis through genetic testing is crucial for managing this rare but devastating neuromuscular disease.
Area of Science:
- Pediatric critical care medicine
- Neurology
- Genetics
Background:
- Mechanical ventilation weaning is challenging in infants with neuromuscular diseases.
- Spinal muscular atrophy (SMA) is an infrequent cause of respiratory insufficiency in infants.
- Differentiating between axonal and motor neuron diseases is key in diagnosis.
Observation:
- A 6-month-old boy presented with respiratory distress, fever, hypotonia, and areflexia.
- The infant required mechanical ventilation due to progressive respiratory distress.
- Weaning from mechanical ventilation was unsuccessful, leading to respiratory failure.
Findings:
- Autopsy and genetic studies confirmed Spinal Muscular Atrophy (SMA).
- Muscular biopsy and genetic testing confirmed the diagnosis.
- Neuromuscular diseases present a diagnostic challenge in infants with respiratory failure.
Implications:
- This case highlights the importance of considering rare neuromuscular diseases in infants with unexplained respiratory failure.
- Early diagnosis of SMA is critical for appropriate management and genetic counseling.
- Understanding the genetic basis of SMA aids in differential diagnosis and prognosis.
Abstract:
The weaning process is a critical phase in patients undergoing mechanical ventilation. This process can be hampered by numerous causes, such as neuromuscular diseases and spinal muscular atrophy (SMA). We present a 6-month-old boy with respiratory distress, fever, marked hypotonia without motor developmental milestones, and areflexia. The patient showed progressive respiratory distress requiring mechanical ventilation. Definitive weaning was not achieved and the boy died from respiratory failure. Partial autopsy was performed with a diagnosis of SMA and genetic study of the parents. Neuromuscular diseases are an infrequent cause of respiratory insufficiency in suckling infants. The differential diagnosis is made between axonal and motor neuron diseases. The diagnosis was confirmed by muscular biopsy and genetic study.
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