Clinical review: Critical illness polyneuropathy and myopathy

Greet Hermans, Bernard De Jonghe, Frans Bruyninckx, Greet Van den Berghe, Greet Hermans, Bernard De Jonghe, Frans Bruyninckx, Greet Van den Berghe

Abstract

Critical illness polyneuropathy (CIP) and myopathy (CIM) are major complications of severe critical illness and its management. CIP/CIM prolongs weaning from mechanical ventilation and physical rehabilitation since both limb and respiratory muscles can be affected. Among many risk factors implicated, sepsis, systemic inflammatory response syndrome, and multiple organ failure appear to play a crucial role in CIP/CIM. This review focuses on epidemiology, diagnostic challenges, the current understanding of pathophysiology, risk factors, important clinical consequences, and potential interventions to reduce the incidence of CIP/CIM. CIP/CIM is associated with increased hospital and intensive care unit (ICU) stays and increased mortality rates. Recently, it was shown in a single centre that intensive insulin therapy significantly reduced the electrophysiological incidence of CIP/CIM and the need for prolonged mechanical ventilation in patients in a medical or surgical ICU for at least 1 week. The electrophysiological diagnosis was limited by the fact that muscle membrane inexcitability was not detected. These results have yet to be confirmed in a larger patient population. One of the main risks of this therapy is hypoglycemia. Also, conflicting evidence concerning the neuromuscular effects of corticosteroids exists. A systematic review of the available literature on the optimal approach for preventing CIP/CIM seems warranted.

Figures

Figure 1
Figure 1
Presumed pathophysiological mechanisms and their interactions involved in the development of critical illness polyneuropathy/critical illness myopathy (CIP/CIM). CS, corticosteroids; NMBA, neuromuscular blocking agent; ROS, reactive oxygen species; SR, sarcoplasmatic reticulum.

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