Neuromuscular monitoring in intensive care patients: milliamperage requirements for supramaximal stimulation†  N.J.N. Harper, R. Greer, D. Conway  British.

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Neuromuscular monitoring in intensive care patients: milliamperage requirements for supramaximal stimulation†  N.J.N. Harper, R. Greer, D. Conway  British Journal of Anaesthesia  Volume 87, Issue 4, Pages 625-627 (October 2001) DOI: 10.1093/bja/87.4.625 Copyright © 2001 British Journal of Anaesthesia Terms and Conditions

Fig 1 Milliamperage current (mA) required for supramaximal stimulation in critically ill patients with differing grades of peripheral oedema. Median currents supramaximal current are depicted as a horizontal line before the application of pressure (light shading) and after the application of pressure (dark shading). The limits of the box represent the 25th and 75th percentiles and the bars represent the range. Individual patients with current requirements greater than 100 mA are indicated as O. The median supramaximal current was 40 mA in non‐oedematous limbs. In comparison with the non‐oedematous state, the supramaximal current in the presence of oedema was significantly raised (P<0.01, Mann–Whitney test): grade 1 oedema median supramaximal current=60 mA and grade 2 oedema median supramaximal current=82.5 mA. The application of pressure (dark shading) made no difference to the supramaximal current C where there was no oedema, but it decreased significantly (Wilcoxon signed rank test, P<0.05) to 50 mA in the presence of grade 1 oedema and to 75 mA in the presence of grade 2 oedema (Wilcoxon signed rank test, P<0.05). British Journal of Anaesthesia 2001 87, 625-627DOI: (10.1093/bja/87.4.625) Copyright © 2001 British Journal of Anaesthesia Terms and Conditions