Periodic cardiovascular and ventilatory activity during midazolam sedation.

Abstract:

:We have examined the effects of sedation with midazolam 0.1 mg kg-1 and reversal with flumazenil 0.5 mg on beat-to-beat heart rate (HR) variability (HRV), systolic arterial pressure (SAP), finger photoplethysmograph amplitude (PLA) and impedence pneumography in eight volunteers. With the onset of sedation there was a small decrease in SAP and increase in HR (ns). Spectral analysis of the HR time series showed reductions in the proportion of power in the high (> 0.15 Hz) frequency "ventilatory" band consistent with midazolam causing vagolysis. During sedation, low frequency (< 0.05 Hz) oscillations of PLA, HR, SAP and ventilation were observed. These were thought to be secondary to activity of coupled cardiorespiratory neurones within the brain stem and the ventilatory periodicity appeared similar to that observed during the early stages of sleep. The diminished high frequency and increased low frequency oscillations induced by midazolam sedation were reversed by administration of flumazenil.

journal_name

Br J Anaesth

authors

Galletly DC,Williams TB,Robinson BJ

doi

10.1093/bja/76.4.503

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

503-7

issue

4

eissn

0007-0912

issn

1471-6771

pii

S0007-0912(17)43511-2

journal_volume

76

pub_type

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