0
Articles |

Vasoactive Effects of Ketamine on Isolated Rabbit Pulmonary Arteries FREE TO VIEW

Tai-Shion Lee; Xiuhua Hou
Author and Funding Information

From the Department of Anesthesiology, Harbor-UCLA Medical Center, Torrance, Calif.


1995 by the American College of Chest Physicians


Chest. 1995;107(4):1152-1155. doi:10.1378/chest.107.4.1152
Text Size: A A A
Published online

Abstract

Ketamine has been used in patients with congenital heart disease and pulmonary hypertension with hypothetical controversy. Its direct effect on pulmonary arteries has not yet been clearly characterized. This in vitro study was performed to determine the direct vasoactive effects of ketamine on isolated rabbit pulmonary arteries. Responses of pulmonary artery rings from New Zealand white rabbits were assessed in the presence and absence of intact endothelium and with or without precontraction by norepinephrine (NE, 3x 10−6M) or potassium chloride (KCl, 3x10−2M). Using a preparatory tissue bath, cumulative concentration response curves of ketamine were obtained at different concentrations (0.03, 0.1, 0.3, 1, 3 mM) after a period of stabilization. Ketamine caused a dose-related vasodilation on KCl-precontracted pulmonary arteries. It elicited almost 100% relaxation at a concentration of 3 mM. Ketamine also induced a dose-related vasodilation on NE-precontracted pulmonary arteries at a lesser degree. All of the effects were endothelium independent. In conclusion, ketamine has strong endothelium-independent, direct vasodilatory effects on isolated rabbit pulmonary arteries. Ketamine may act through Ca++ channel-blocking effect as well as inhibition of Ca++ release from sarcoplasmic reticulum.


Figures

Tables

References

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

CHEST Journal Articles
PubMed Articles
  • CHEST Journal
    Print ISSN: 0012-3692
    Online ISSN: 1931-3543