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Effect of leukotriene antagonist (RS-411) on LTD4-induced coronary spasm Junko Honye 1 1The 2nd Department of Internal Medicine, Nihon University School of Medicine pp.1343-1348
Published Date 1986/12/15
DOI https://doi.org/10.11477/mf.1404204980
  • Abstract
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We evaluated the action of Leukotriene D4 (LTD4) on coronary circulation and the effect of LT antagonist (RS-411) on LTD4-induced coronary spasm in anes-thetized dogs.

The dogs were administered LTD4 (0.33μg) into the left anterior descending artery (LAD) and hemo-dynamic parameters as well as epicardial ECG were recorded. Following the intracoronary administration of RS-411 50 μg /kg (pretreatment), dogs were admini-stered LTD44(0.33 μg) and recorded the same para-meters. In 4 dogs, coronary angiography (CAG) was performed to study the effect of RS-411 on LTD4-induced coronary spasm. In results, LTD4 caused a significant reduction in coronary blood flow and a significant increase in coronary vascular resistance with a marked ST elevation on epicardiaI ECG. A significant increase in left ventricular end-diastolic pressure and a transient decrease in aortic pressure, mean coronary arterial pressure, and aortic flow were observed with no effect in heart rate. No change in hemodynamic parameters were shown after the pretreat-ment of RS-411, and the duration of ST elevation was significantly shortened.

CAGs documented the total occlusion of LAD in all dogs after intracoronary administration of LTD4, but the degrees of coronary spasm were attenuated by RS-411 in each dog.

These data suggest that RS-411 is effective to LTD4-induced coronary spasm. It is also indicated that LTD4 has direct coronary vasoconstrictory action and might play an important role in pathogenesis and deterio-ration of myocardial ischemia.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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