A methodology to explore ventilatory chemosensitivity and opioid-induced respiratory depression risk.

Journal of Applied Physiology
Tiffany W DongRichard E Moon

Abstract

Reported incidence of postoperative opioid-induced respiratory depression (OIRD) ranges from 0.5-41% and is not reliably predicted by traditional risk factors. This study tests a new methodology to investigate ventilatory chemosensitivity as a new potential risk factor and explore OIRD distribution across sleep and wakefulness. Preoperative patient ventilatory chemosensitivity was quantified by hypercapnic ventilatory responses with (HCVRREMI, effect site concentration 0.7 or 2.0 ng/mL) and without (HCVRBL) remifentanil during hyperoxia and hypoxia. Postoperative opioid consumption was recorded during hospital stays. OIRD frequency was the primary outcome of the study, detected as incidences of respiratory rate < 60% of baseline, minute ventilation < 60% of predicted value, pulse oximetry [Formula: see text] < 90% (breathing room air) or 92% (supplemental O2), transcutaneous Pco2 > 50 mmHg, and central and obstructive apnea/hypopnea. Sleep stages were recorded until the first postoperative morning to determine the OIRD sleep distribution as the secondary outcome. The methodology was feasible in implementation and posed no obstacles to standard care. In the nine patients studied (2 females, mean age 65 ± 7.5 yr), remifentanil de...Continue Reading

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Oct 13, 2020·Journal of Applied Physiology·Tiffany W DongRichard E Moon

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Methods Mentioned

BETA
PCA

Clinical Trials Mentioned

NCT04047550

Software Mentioned

MATLAB
R
RespirAct
WatchPAT
TIVATrainer

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