Functional significance of collaterals during ameroid-induced coronary stenosis in conscious dogs. Interrelationships among regional shortening, regional flow and grade of coronary stenosis

We studied the relationships among collateral flow, regional myocardial shortening and the grade of coronary stenosis during ameroid-induced chronic coronary constriction in 22 conscious dogs. A radiolucent ameroid, a Doppler flow probe and a cuff occluder were placed on the left circumflex coronary...

Full description

Saved in:
Bibliographic Details
Published in:Circulation (New York, N.Y.) N.Y.), 1983-05, Vol.67 (5), p.1001-1008
Main Authors: Tomoike, H, Inou, T, Watanabe, K, Mizukami, M, Kikuchi, Y, Nakamura, M
Format: Article
Language:English
Subjects:
Animals
Biocompatible Materials
Caseins
Collateral Circulation
Constriction
Coronary Circulation
Coronary Disease - etiology
Coronary Disease - physiopathology
Coronary Vessels
Dogs
Heart - diagnostic imaging
Heart - physiopathology
Hydrogels
Microspheres
Myocardium - pathology
Radiography
Time Factors
Ultrasonography
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We studied the relationships among collateral flow, regional myocardial shortening and the grade of coronary stenosis during ameroid-induced chronic coronary constriction in 22 conscious dogs. A radiolucent ameroid, a Doppler flow probe and a cuff occluder were placed on the left circumflex coronary artery (LCx). Regional myocardial shortening and regional myocardial blood flow were assessed simultaneously using ultrasonic dimension gauges and the tracer microsphere technique, respectively, during temporary occlusion of the LCx. Regional hypokinesia and ischemia were attenuated as a function of time during progressive coronary stenosis. Fifty percent recovery and full recovery of regional shortening during occlusion were observed 19 +/- 3 and 25 +/- 4 days after instrumentation, respectively, when the endocardial blood flow recovered from 0.42 +/- 0.07 ml/min/g at 7 days to 0.56 +/- 0.07 and 0.80 +/- 0.05 ml/min/g, respectively. Greater than 75% coronary stenosis coincided with collateral development, as estimated from regional shortening rate and the appearance of angiographically opacified collaterals. Our study confirms that the development of collateral vessels reduces regional ischemia and hypokinesia induced during abrupt coronary occlusion in a canine model.
ISSN:0009-7322
1524-4539
DOI:10.1161/01.CIR.67.5.1001