Respiratory considerations in patients with neuromuscular disorders

Abstract

Patients with neuromuscular disorders (NMDs) develop respiratory impairment as muscles weaken. Ensuing complications include reductions in lung volume, compliance, and cough ability and increased risk for lung infections. Sleep disordered breathing results from weakened upper airway muscles and/or impaired central ventilatory control systems. Evaluation includes measurement of seated and supine vital capacity (VC) and respiratory muscle strength. Assisted cough techniques facilitate airway clearance. The decision to initiate assisted ventilation is multifactorial, and may include consideration of patient symptoms, spirometry, pulmonary pressures, sleep studies or blood gas values. Most patients prefer noninvasive ventilation to enhance mobility and independence. Tracheostomy is indicated when bulbar function is impaired and cough assist measures fail to clear the airway. Technological advances in respiratory support have improved quality of life and longevity. Home care is the best option for most patients but remains a challenge, especially for caregivers with regard to physical, emotional, and financial implications, as well as social, administrative, and insurance concerns.

Keywords: cough-assist techniques; neuromuscular disorder; noninvasive ventilation; respiratory pressures; vital capacity.