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Table 7 Correlation between COPD severity and evoked potentials (visual and auditory)

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

  GOLD
R P value
BAEP I latency Right 0.93 < 0.001*
Left 0.94 < 0.001*
BAEP II latency Right 0.3 0.06(NS)
Left 0.26 0.10(NS)
BAEP III latency Right 0.92 < 0.001*
Left 0.65 < 0.001*
BAEP IV latency Right 0.38 0.016
Left 0.24 0.12(NS)
BAEP V latency Right 0.16 0.33(NS)
Left − 0.07 0.68(NS)
IPL I–III Right 0.01 0.93(NS)
Left − 0.49* 0.001*
IPL I–V Right − 0.66 < 0.001*
Left − 0.75* < 0.001*
IPL III–IV Right − 0.62 < 0.001*
Left − 0.54 < 0.001*
BEAP I amplitude Right 0.001 0.99(NS)
Left − 0.07 0.68(NS)
BEAP V amplitude Right − 0.12 0.47(NS)
Left 0.13 0.42(NS)
P100 right Latency 0.12 0.44(NS)
Amplitude 0.10 0.54(NS)
P100 left Latency 0.09 0.58(NS)
Amplitude 0.10 0.55(NS)
  1. IPL interpeak latency difference, NS non significant, *significant