["Critical-illness" polyneuropathy and -myopathy]

Critical-illness polyneuropathy and myopathy (CIPNM) can be considered a part of the syndrome of multiple organ dysfunction. CIPNM is the commonest cause of muscle weakness acquired in the intensive care unit. Its incidence is 35-80% during prolonged mechanical ventilation. For a (differential) diagnosis, electrophysiological investigations are usually necessary, and sometimes a muscle biopsy. CIPNM may be induced by triggering of the immune response leading to increased vascular permeability with tissue invasion of inflammatory cells and local damage. There is a relation between myopathy and medication, notably corticosteroids. Clinical improvement usually follows when the CIPNM patient survives the underlying disease, but weaning from artificial ventilation is often difficult, and rehabilitation prolonged.