Effects of glyceryl trinitrate on functionally regressed newly developed collateral vessels in conscious dogs.

Abstract

The effects of glyceryl trinitrate on collateral blood flow and regional myocardial function during a 2 min coronary occlusion were evaluated in 10 conscious dogs with well developed collateral vessels. Collateral growth was promoted by brief, repeated, reversible coronary occlusions. After partial regression in collateral function a small dose of glyceryl trinitrate (5 micrograms.kg-1) was injected intravenously 1 min before coronary occlusion. After pretreatment with glyceryl trinitrate the collateral blood flow velocity (mean[SD]) increased from 3.0(0.9) to 4.4(1.4) cm.s-1 (p less than 0.05). After 2 min of occlusion the percentage systolic subendocardial segment shortening in the collateral dependent zone increased from 7.8(6.1) to 12.6(6.7)% (p less than 0.05). The blood flow debt repayment after release of the occlusion decreased from 122(41) to 68(34%) (p less than 0.05). Thus in conscious dogs with regressed newly developed collaterals a major component of the beneficial effects of glyceryl trinitrate on collateral circulation is dilatation of collateral vessels, as evidenced by a pronounced increase in collateral blood flow and myocardial function during a transient period of coronary occlusion.

• Authors: M Fujita, D P McKown, M D McKown, D Franklin
• Journal: Cardiovascular research (Cardiovasc Res) Vol. 22 Issue 9 Pg. 639-47 (Sep 1988) ISSN: 0008-6363 [Print] England
• PMID: 3149547 (Publication Type: Journal Article)

Chemical References

• Nitroglycerin

Topics

• Animals
• Collateral Circulation (drug effects)
• Coronary Circulation (drug effects)
• Coronary Disease (physiopathology)
• Coronary Vessels (drug effects)
• Dogs
• Heart (physiopathology)
• Hemodynamics
• Nitroglycerin (pharmacology)