Table 3—

Phrenic nerve conduction studies

UDPControlp-value
Latency ms
 Weak side11.3±3.06.7±0.8#<0.001
 Strong side9.3±2.26.9±1.00.004
CMAP mV
 Weak side0.370±0.2541.405±0.430#<0.001
 Strong side0.891±0.2991.359±0.3700.004
Weaker side R:L n10:1
  • Data are presented as mean±sd, unless otherwise stated. UDP: unilateral diaphragm paralysis or severe weakness; CMAP: compound muscle action potential; R: right; L: left. #: normal subjects with normal hemidiaphragm strength measured on the less strong side; : normal subjects with normal hemidiaphragm strength measured on the stronger side.