Table 2.

Phrenic nerve amplitude (mV)

	Pre-operative		post-operative
	Left	Right	Left	Right
CABG with CPB (n = 35)	0.33 ± 0.25	0.34 ± 0.18	0.28 ± 0.17	0.35 ± 0.16
Valv replacement with CPB (n = 9)	0.27 ± 0.11	0.42 ± 0.15	0.26 ± 0.09	0.26 ± 0.11
CABG with beating heart (n = 12)	0.35 ± 0.29	0.38 ± 0.22	0.25 ± 0.15	0.33 ± 0.16
Peripheral artery surgery (n = 17)	0.59 ± 0.56	0.43 ± 0.34	0.47 ± 0.46	0.37 ± 0.31

CABG, Coronary artery bypass grafting; CPB, Cardiopulmonary bypass No statistically significant differences were observed between groups and in the same groups, pre and postoperatively except five patients with phrenic injury (p > 0.05).