Overview
:
The expiration-inspiration (E-I) ratio is
used to assess the reflex increase in the heart rate that
occurs at the end of inspiration and the reflex decrease in
heart rate that follows at the end of expiration.
expiration-inspiration ratio =
= (sum of six longest R-R intervals
occurring during 6 expirations) / (sum of the shortest R-R
intervals occurring during 6 inspirations)
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