Relation of left ventricular mass to geometry of the proximal coronary arteries in the dog

Richard S. Stack, Judith C. Rembert, Bruce Schirmer, Joseph C. Greenfield

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Proximal epicardial coronary artery luminal diameters were measured from silicone casts formed in situ in freshly excised hearts under a constant pressure of 100 mm Hg. Twenty-five coronary arteries from 15 normal dogs and 22 coronary arteries in 13 dogs with either chronic pressure or volume overload hypertrophy were studied. Mean left ventricular (LV) body weight ratios were 4.75 ± 1.01 g/kg in the normal dogs, 8.4 ± 1.7 g/kg in the pressure-overload dogs, and 6.2 ± 0.6 g/kg in the volume-overload dogs. The cross-sectional area of the left circumflex (LC) coronary artery was determined at 11 branch sites. The ratio of the area of the branches to the area of the parent vessel was 1.095 ± 0.105, indicating that the cross-sectional area after a branch point increased. A poor correlation existed between LV mass and coronary artery diameter in both normal and hypertrophy groups for the LC (r = 0.44), the left anterior descending (LAD) (r = 0.63), and the combined LC and LAD (r = 0.52). The mean cross-sectional area of the combined LC and LAD was 0.12 cm2 in the normal group and 0.15 cm2 in the hypertrophy group; this increase was not statistically significant (p = 0.13). When the mean cross-sectional area of the combined vessels was adjusted for heart weight, there was a decrease in the cross-sectional area/100 g of myocardium in the hypertrophy group compared with the control group. These data demonstrate that coronary artery luminal diameter in the dog does not increase commensurately with the increase in mass associated with myocardial hypertrophy.

Original languageEnglish (US)
Pages (from-to)1728-1731
Number of pages4
JournalThe American Journal of Cardiology
Volume51
Issue number10
DOIs
StatePublished - Jun 1983

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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