Critical illness neuromuscular abnormalities (CINMA) are found in 25 percent of ITU patients who recover consciousness and are characterized by a bilateral and symmetric weakness that involves the four limbs but spares the facial muscles. Electrophysiological testing shows an axonal sensory motor polyneuropathy and/or myopathy. The main risk factors of CINMA are prolonged durations of multiple organ failure and mechanical ventilation, use of corticosteroids and hyperglycaemia. CINMA contribute also to increase the duration of mechanical ventilation, this effect being mediated by diaphragm weakness. The median duration of limb weakness is 21 days, although it can exceed several months in some patients. Few preventive measures have been assessed. Whether the benefit of strict blood glucose control in ITU patients recovering from heart surgery on CINMA incidence can be extended to medical ICU patients needs to be determined.