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Table 2 Comparison between patient and control groups as regards the auditory brain stem evoked potential (ABR)

From: Electrophysiological biomarkers of central nervous system affection in cases of chronic obstructive pulmonary disease (COPD)

  COPD Control P
   Mean SD Mean SD
I-Latency (ms) Right 1.54 0.29 1.24 0.08 < 0.001*
Left 1.61 0.31 1.28 0,09 < 0.001*
II-Latency (ms) Right 2.63 0.31 2.57 0.15 0.28(NS)
Left 2.74 0.26 2.68 0.11 0.22(NS)
III-Latency
(ms)
Right 3.64 0.3 3.26 0.12 < 0.001*
Left 3.64 0.27 3.3 0.09 < 0.001*
IV-Latency
(ms)
Right 4.56 0.05 4.54 0.06 0.31(NS)
Left 4.58 0.07 4.56 0.05 0.12(NS)
V-Latency
(ms)
Right 5.88 0.27 5.45 0.11 < 0.001*
Left 5.97 0.29 5.49 0.1 < 0.001*
IPLs
I–III (ms)
Right 2.1 0.13 2.01 0.13 0.01*
Left 2.02 0.25 2.02 0.12 0.8(NS)
IPLs
I–V (ms)
Right 4.33 0.35 4.21 0.17 0.08(NS)
Left 4.35 0.42 4.2 0.17 0.07(NS)
IPLs
III–V (ms)
Right 2.23 0.38 2.19 0.16 0.6(NS)
Left 2.32 0.36 2.2 0.15 0.06(NS)
BAEP-I amplitude (μv) Right 0.33 0.02 0.67 0.04 < 0.001*
Left 0.34 0.03 0.68 0.04 < 0.001*
BAEP-V amplitude (μv) Right 0.44 0.04 0.46 0.03 0.05*
Left 0.45 0.04 0.47 0.04 0.035*
  1. IPL interpeak latency difference, NS non-significant, *significant