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ARTICLES

Coronary angiogenesis during long-term hypertension and left ventricular hypertrophy in dogs.

R J Tomanek, K A Schalk, M L Marcus, D G Harrison
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https://doi.org/10.1161/01.RES.65.2.352
Circulation Research. 1989;65:352-359
Originally published August 1, 1989
R J Tomanek
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K A Schalk
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M L Marcus
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D G Harrison
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Abstract

Many studies have documented that during the development of left ventricular hypertrophy (LVH) coronary vascular growth lags behind that of cardiac muscle. To ascertain whether significant growth of coronary resistance vessels occurs with long-standing hypertension and LVH, we studied dogs with Goldblatt (one-kidney, one-clip) hypertension seven months after surgery. Left ventricular minimal coronary vascular resistance (LV MCVR) was derived from adenosine-induced maximal flow measured with 15 microns microspheres. Morphometric data were based on perfuse-fixed hearts arrested in diastole. Hypertension and LVH were associated with a 46% increase in left ventricular weight/body weight ratio (LVH, 6.73 +/- 0.31; control, 4.62 +/- 0.30), no significant change in LV MCVR/100 g, and a reduction in total LV MCVR (LVH, 0.11 +/- 0.02 mm Hg/ml/min; control, 0.15 +/- 0.02 mm Hg/ml/min). Arterial and arteriolar wall/lumen ratios were virtually identical in the two groups. Arteriolar (lumen diameter less than 200 microns) numerical densities (arteriolar profiles/mm2) were also similar for the two groups even when analyzed according to lumen diameter size class and by ventricular location (epimyocardium, midmyocardium, and endomyocardium). Moreover, the relative frequency distribution of any arteriolar size class was similar for both groups. Because MCVR and arteriolar density were normal, this study provides new evidence that angiogenesis during long-term LVH in this model is of sufficient magnitude to enable the cross-sectional area of the coronary resistance vessels to increase in proportion to the increase in left ventricular mass.

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Circulation Research
August 1, 1989, Volume 65, Issue 2
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    Coronary angiogenesis during long-term hypertension and left ventricular hypertrophy in dogs.
    R J Tomanek, K A Schalk, M L Marcus and D G Harrison
    Circulation Research. 1989;65:352-359, originally published August 1, 1989
    https://doi.org/10.1161/01.RES.65.2.352

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    Coronary angiogenesis during long-term hypertension and left ventricular hypertrophy in dogs.
    R J Tomanek, K A Schalk, M L Marcus and D G Harrison
    Circulation Research. 1989;65:352-359, originally published August 1, 1989
    https://doi.org/10.1161/01.RES.65.2.352
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