Key result
Fentanyl at 25 μg/kg caused postoperative ventilatory depression, which was exacerbated by hypocapnic hyperventilation during anesthesia and associated with plasma concentrations of 1.5-3.0 ng/ml.
Why the study?
Does fentanyl 25 μg/kg compared to 10 μg/kg increase postoperative ventilatory depression in patients undergoing general anesthesia?
RCT (n=24)
Randomly allocated into four groups
Does fentanyl 25 μg/kg compared to 10 μg/kg increase postoperative ventilatory depression in patients undergoing general anesthesia?
Higher doses of fentanyl (25 μg/kg) and hypocapnic hyperventilation during anesthesia increase the risk of postoperative ventilatory depression and decrease fentanyl clearance.
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Avoid fentanyl 25 μg/kg and hypocapnic hyperventilation to reduce postoperative ventilatory depression risk; confirms dose- and ventilation-dependent respiratory effects in anesthesia.
Cartwright et al. (1983) conducted an RCT in Patients undergoing general anesthesia (n=24). Fentanyl vs. Different dose and ventilation groups was evaluated on Ventilatory depression (CO2 responsiveness decreased to <50% of awake values, PACO2 > 48 torr). Fentanyl at 25 μg/kg caused postoperative ventilatory depression, which was exacerbated by hypocapnic hyperventilation during anesthesia and associated with plasma concentrations of 1.5-3.0 ng/ml.
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