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Ventilatory effects of premedication with clonidine
D Benhamou1, Y Veillette, P Narchi
1Département d'Anesthésie-Réanimation, Université Paris-Sud, Hôpital Antoine Béclère, Clamart, France.
Anesthesia and Analgesia
|December 1, 1991
Summary
Clonidine premedication may cause significant hypotension, bradycardia, and sedation. While not affecting overall ventilation, it can lead to obstructive airway patterns and reduced oxygen saturation in surgical patients.
Area of Science:
- Anesthesiology
- Pharmacology
Background:
- Clonidine is considered for surgical premedication due to its hemodynamic benefits, particularly in high-risk cardiovascular patients.
- Existing research on clonidine's impact on ventilation is contradictory.
Purpose of the Study:
- To investigate the effects of oral clonidine on respiratory function and hemodynamics in healthy volunteers.
- To compare clonidine's effects against a placebo in a double-blind, randomized crossover design.
Main Methods:
- Eight healthy volunteers (ASA physical status I) received 300 micrograms of oral clonidine or placebo.
- A double-blind, randomized crossover design was employed to compare the effects.
Main Results:
- Clonidine significantly increased hypotension, bradycardia, and sedation compared to placebo.
- No significant difference in minute ventilation, tidal volume, or respiratory rate was observed between clonidine and placebo.
- Clonidine induced obstructive airway patterns with moderate decreases in oxygen saturation, unlike placebo.
Conclusions:
- Clonidine's potential to cause obstructive airway patterns and reduce oxygen saturation must be considered during surgical premedication.
- The detrimental effects on airway obstruction warrant caution when prescribing clonidine, despite its hemodynamic benefits.