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Copyright ©ERS Journals Ltd 2002
Noninvasive ventilation for chest wall and neuromuscular disorders
1 Respiratory Support and Sleep Centre, Papworth Hospital, Cambridge, and 2 Sleep and Ventilation Unit, Royal Brompton and Harefield NHS Trust, London, UK
CORRESPONDENCE: J.M. Shneerson, Respiratory Support and Sleep Centre, Papworth Hospital, Cambridge, CB3 8RE, UK. Fax: 44 1480830620. E-mail: john.shneerson@papworth-tr.anglox.nhs.uk
Keywords: motor neurone disease, muscular dystrophy, nasal ventilation, negative pressure ventilation, scoliosis, thoracoplasty
Received: April 16, 2002
Accepted April 16, 2002
Abstract
Neuromuscular and chest wall disorders are individually uncommon but together form an important group of conditions that can lead to chronic ventilatory failure. This is best recognised in scoliosis, kyphosis, following a thoracoplasty, in muscular dystrophies, such as Duchenne muscular dystrophy (DMD), and myotonic dystrophy, after poliomyelitis and with motor neurone disease (amyotrophic lateral sclerosis).
If bulbar function is impaired, tracheostomy ventilation may be required, but in other situations, noninvasive ventilation is preferable. Positive pressure techniques using nasal and face masks are usually the first choice, but negative pressure ventilation is an alternative.
There are no randomised-controlled trials regarding the indications for initiating noninvasive ventilation, but this is usually provided if there are symptoms due to nocturnal hypoventilation or right heart failure in the presence of a raised carbon dioxide tension in arterial blood (Pa,CO2) either at night or, more usually, in the daytime as well. There is no evidence that "prophylactic" ventilatory support is of benefit if this is provided before ventilatory failure has appeared. Careful selection of patients is required, especially in the presence of progressive neuromuscular disorders such as DMD and motor neurone disease.
There are no randomised-controlled trials concerning the outcome of noninvasive ventilation in these conditions, but studies have shown an improved quality of life, physical activity and haemodynamics, normalisation of blood gases and slight improvement in other physiological measures, such as the vital capacity and maximal mouth pressures. Survival in chest wall disorders is
90% at 1 yr and 80% at 5 yrs, and similar figures have been obtained in nonprogressive neuromuscular conditions. If, however, the underlying disorder is deteriorating, particularly if it involves the bulbar muscles, it may limit survival despite the provision of adequate noninvasive ventilatory support.
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