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Circulation, Vol 54, 484-494, Copyright © 1976 by American Heart Association
MB Weiss, K Ellis, RR Sciacca, LL Johnson, DH Schmidt and PJ Cannon
Myocardial blood flow/unit mass (MBF) and the determinants of myocardial
oxygen consumption were measured in seven control subjects (group I) and 15
patients (pts) with cardiomyopathy (CM), group II (group IIa-congestive CM:
10 pts; group IIb-hypertrophic CM: 5 pts). In group I left ventricular (LV)
MBF was 64 +/- 8 (SD) ml/100g-min; it was significantly lower in IIa (45
+/- 15 ml/100g-min, P less than 0.01) and IIb (39 +/- 7 ml/100g-min, P less
than 0.01). However, calculated total LV flow (LV mass X MBF) was increased
in the two CM groups. In nine CM pts, LV MBF increased in response to
atrial pacing from 41 +/- 7 to 63 +/- 13 ml/100g-min. In group IIa,
calculated peak wall stress was normal (4.39 +/hortening (MVcf) was
significantly reduced (0.53 +/- 0;18 vs 1.26 +/- 0.12 circum/sec, P less
than 0.01). In IIb, MVcf was normal but peak stress was significantly
reduced (2.80 +/- 0.75 vs 4.51 +/- 1.10 dynes/cm2 X 10(5), P less than
0.05). Multiple regression analysis based on all pts yielded, MBF - 16.9
MVcf + 9.30 Stress + 0.26 Heart Rate - 26.4 (r=0.79). The data indicate
that MBF is reduced in CM patients and the regression analysis suggests
that MBF in these 22 pts with normal coronary arteriograms was determined
largely by heart rate, peak stress, and ventricular performance.
ARTICLES
Myocardial blood flow in congestive and hypertrophic cardiomyopathy: relationship to peak wall stress and mean velocity of circumferential fiber shortening
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