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  • Title: [Respiratory management in muscular dystrophies].
    Author: Kuru S.
    Journal: Brain Nerve; 2011 Nov; 63(11):1229-36. PubMed ID: 22068475.
    Abstract:
    Respiratory failure is a major contributor to immobility and mortality in progressive muscular dystrophies. The severity of pulmonary impairment and the stage at which it develops differ according to the type of muscular dystrophy. Appropriate respiratory management for each type should be considered. In Duchenne muscular dystrophy (DMD), respiratory impairment manifests in the late teens, and assisted mechanical ventilation is administered. Noninvasive positive-pressure ventilation (NIPPV) has increased the median survival of patients with DMD by 10 year and improved quality of life. In myotonic dystrophy (MyD), the causes of respiratory failure can involve both the central and the peripheral nervous systems in addition to respiratory muscles. Nocturnal desaturation is more severe in MyD than in other muscular dystrophies with similar degrees of respiratory muscle weakness. Cognitive impairment should be taken into account in the management of MyD patients. NIPPV does not appear to improve survival of MyD. Guidelines for DMD have been published. Respiratory function should be assessed serially by measuring forced vital capacity, oxyhemoglobin saturation, peak cough flow, and end-tidal CO2 level. A respiratory action plan should be enacted with increasing disease severity. Therapeutic measures comprise airway clearance, respiratory muscle training, noninvasive nocturnal ventilation, daytime noninvasive ventilation, and continuous invasive ventilation. At the advanced stage of respiratory failure, attention should be paid to complications related to long-term mechanical ventilation, such as pneumothorax and tracheal hemorrhage. Discussing about end-of-life care among the patient, family, and physician is important before mechanical ventilatory support is required.
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