Fig. 2From: Hypercapnic respiratory failure during pregnancy due to polymyositis-related respiratory muscle weakness: a case reportNeedle electromyography. a Increased insertional activity of right first dorsal interosseous (FDI) muscle. b Spontaneous fibrillation potential and positive sharp waves of right trapezius muscle. c Myopathic motor unit potential and early recruitment of right iliopsoas muscle. μV microvolt, ms millisecond, mV millivoltBack to article page