The diagnosis of acute neuromuscular paralysis includes central nervou
s system disorders, peripheral neuropathy, neuromuscular conduction bl
ock and muscle disease. Identification of the cause is largely a clini
cal problem but neurophysiological investigations are often essential
and a few specific tests are helpful. The commonest cause is Guillain-
Barre syndrome. Special precautions, especially monitoring vital capac
ity, must be taken to detect respiratory failure and avoid atelectasis
and chest infection. In acute neuropathy there is an additional dange
r of cardiac arrhythmias which requires continuous electrocardiographi
c monitoring. Prolonged artificial ventilation should be supervised by
a specialist multidisciplinary intensive care team. Specific treatmen
t depends on the diagnosis: for Guillain-Barre syndrome, intravenous i
mmunoglobulin is preferred to plasma exchange on the basis of similar
efficacy but greater convenience; steroids are not helpful; for myasth
enia gravis, anticholinesterases and prednisolone may need to be suppl
emented with intravenous immunoglobulin or plasma exchange; for polymy
ositis, steroids are the mainstay of treatment. During convalescence p
atients require understanding and support in coping with residual disa
bility.