Abstract
Purpose
It has been shown that airway ciliary function is impaired by several anesthetic or sedative drugs, which may predispose anesthetized or intensive care patients to respiratory complications, such as hypoxemia, atelectasis and pulmonary infection. We studied the effects of midazolam, propofol, dexmedetomidine, ketamine, fentanyl, thiopental and pentobarbital on ciliary beat frequency (CBF) in isolated and cultured rat tracheal epithelial (RTE) cells, to investigate their direct CBF action removing influences of non-epithelial cells.
Methods
Rat tracheal epithelial cells were purely isolated from tracheas of adult male Sprague-Dawley rats. After 14 to 21 days of culture, the images of motile cilia were videotaped using a phase-contrast microscope. Baseline CBF and CBF 30 or 50 min after administration of vehicle or one of the above agents were computer-analyzed.
Results
Midazolam (0.3–10 μM), propofol (1-100 μM), dexmedetomidine (1–100 nM), fentanyl (0.1–10 nM) and thiopental (30–300 μM) had no effect on CBF. Ketamine at a supraclinical dose (1000 μM) increased CBF (22 ± 13, mean ± standard deviation, % increase from baseline; baseline = 100%) significantly (P < 0.01). Fentanyl at a high clinical dose (100 nM) increased CBF significantly (10 ± 9%). Pentobarbital decreased CBF dose-dependently (100 μM, -2 ± 6%; 300 μM,-14 ± 18%; 1000 μM, -75 ± 5%) and reversibly (P < 0.01).
Conclusion
These results show that midazolam, propofol, dexmedetomidine and thiopental have no direct action on CBF in isolated RTE cells, whereas high doses of ketamine and fentanyl have direct ciliostimulatory actions and pentobarbital has a direct cilioinhibitory action.
Résumé
Objectif
La fonction ciliaire des voies aériennes est affectée par certains anesthésiques ou sédatifs qui peuvent prédisposer des patients anesthésiés, ou en soins intensifs, à ľhypoxémie, ľatélectasie et ľinfection pulmonaire. Les effets des midazolam, propofol, dexmédétomidine, kétamine, fentanyl, thiopental et pentobarbital sur la fréquence des battements ciliaires (FBC) de cellules épithéliales trachéales de rat (ETR), isolées et cultivées, ont été étudiés pour vérifier leur action directe sur la FBC tout en écartant ľinfluence des cellules non épithéliales.
Méthode
Des cellules épithéliales de trachée de rats, mâles adultes Sprague-Dawley, ont été isolées. Après 14 à 21 jours de culture, les images vidéo de cils mobiles ont été enregistrées en utilisant un microscope à contraste de phase. La FBC de base, et celle de 30 ou 50 min après ľadministration du véhicule, ou ďun des médicaments, ont été analysées par ordinateur.
Résultats
Les midazolam (0,3–10 μM), propofol (1–100 μM), dexmédétomidine (1–100 nM), fentanyl (0,1–10 nM) et thiopental (30–300 μM) n’ont pas eu ďeffet sur la FBC. La kétamine, à dose supraclinique (1000 μM), a augmenté la FBC (22 ± 13, moyenne ± écart type, % ďaugmentation; données de base = 100 %) de manière significative (P < 0,01). Le fentanyl, à forte dose (100 nM), a significativement augmenté la FBC (10 ± 9 %). Le pentobarbital a diminué la FBC en fonction de la dose (100 μM, -2 ± 6 %; 300 μM, -14 ± 18 %; 1000 μM, -75 ± 5 %) et de façon réversible (P < 0,01).
Conclusion
Les midazolam, propofol, dexmédétomidine et thiopental n’ont pas ďaction directe sur la FBC de cellules ETR isolées, tandis que de fortes doses de kétamine et de fentanyl ont une action ciliostimulante directe et que le pentobarbital a une action clio-inhibitrice directe.
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Iida, H., Matsuura, S., Shirakami, G. et al. Differential effects of intravenous anesthetics on ciliary motility in cultured rat tracheal epithelial cells. Can J Anesth 53, 242–249 (2006). https://doi.org/10.1007/BF03022209
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DOI: https://doi.org/10.1007/BF03022209