Neurophysiological biomarkers of peripheral nervous system affection in patients with stable chronic obstructive pulmonary disease (COPD)

Table 4 Comparison between patient and control groups as regards to median, ulnar, and radial sensory nerve assessment

		COPD		Control		T value	P value
		Mean	SD	Mean	SD	T value	P value
Right median nerve	Distal latency (ms)	4.48	0.02	3.67	0.02	18.08	< 0.001*
	Amplitude (uv)	11.73	0.32	21.68	0.93	38.6	< 0.001*
	Conduction velocity (m/s)	36.65	1.25	40.10	1.26	11.4	< 0.001*
Left median nerve	Distal latency (ms)	3.51	0.76	3.00	0.61	3.03	< 0.001*
	Amplitude	16.11	0.68	20.43	5.43	1.24	< 0.001*
	Conduction velocity (m/s)	39.10	0.92	41.63	1.19	9.6	< 0.001*
Right ulnar nerve	Distal latency (ms)	3.03	0.62	2.60	0.24	3.57	< 0.001*
	Amplitude (uv)	13.67	4.23	22.86	3.94	15.2	< 0.001*
	Conduction velocity (m/s)	34.79	5.15	49.83	4.67	12.6	< 0.001*
Left ulnar nerve	Distal latency (ms)	3.00	0.62	2.59	0.23	3.39	0.001*
	Amplitude (uv)	12.77	4.10	24.10	3.81	17.5	< 0.001*
	Conduction velocity (m/s)	37.70	5.15	43.53	5.585	16.8	< 0.001*
Right redial nerve	Distal latency (ms)	2.27	0.46	2.41	0.31	9.2	< 0.001*
Right redial nerve	Amplitude (uv)	13.80	5.85	20.43	3.99	13.72	< 0.001*
Left radial nerve	Distal latency (ms)	3.15	0.46	2.35	0.34	99.97	< 0.001*
Left radial nerve	Amplitude (uv)	11.17	5.94	22.06	3.75	53.95	< 0.001*