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Coronary vasoconstrictory action of LTD4:Angiographical documentation of coronary spasm and the evaluation of its mechanism in relation to prostanoids metabolism Naoto Kaseda 1 1The 2nd Department of Internal Medicine, Nihon University School of Medicine pp.547-553
Published Date 1986/5/15
DOI https://doi.org/10.11477/mf.1404204872

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  • Abstract
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We evaluated the coronary vasoconstrictory action of leukotriene D4 (LTD4) in anesthetized mongrel dogs (n=20). LTD4 (0.33,μg or 0.66/μg) was directly admi-nistered into the left anterior descending coronary artery (LAD) from the cannulated first diagonal branch.

Dogs were chosen randamly to receive i.e. admini-stration of either LTD4 0.33,μg one bolus (n=10) or 0.66 μg one bolus (n=10). Coronary blood flow (CBF), coronary arterial pressure (CAP), left ventricular end-diastolic pressure (LVEDP), aortic flow (AoF), coro-nary vascular resistance (CVR) and ST deviation on epicardial ECG were measured before and 15 sec intervals until 60 sec after LTD4, administration. In addition, in the other 10 dogs, to clarify whether the vasoconstrictory action of LTD4, is primary or mediated by TXA2, LTD4 were administered after intravenous infusion of OKY-046 (a selective TXA2 synthetase inhibitor). Futhermore, to confirm the LTD4-induced coronary spasm, coronary arteriography (CAG) was performed (n=5).

In results, LTD4 0.33/μg i.c. administration caused a significant dose-dependent reduction of CBF (from 0.85±0. 05 to 0.66±0. 06ml/kg/min, P<0.01) and a significant elevation of CVR (from 4.7±0.4 to 7.3±0.9 mmHg/ml/min, P<0.01) concomitant with a marked elevation of ST segment on epicardial ECG (peak voltage 1.8±0. 2 mV, duration 46±6 sec).

And LVEDP elevated significantly from 8.7+0.6 to 9.7±0.7mmHg (P<0.01), meanwhile, AoF and thromboxane B2 (TXB2) level in coronary sinus were not changed. OKY-046 did not influence these changes induced by LTD4.Furthermore, LTD4-induced coronary spasm was directly documented by CAG.

It was concluded that LTD4 is extremely a potent coronary vasoconstrictor and may play an important role in the pathogenesis of coronary spasm and is chemic heart disease.


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

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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