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CLINICAL STUDIES

Modulation of left ventricular diastolic distensibility by collateral flow recruitment during balloon coronary occlusion

^a Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University, Toyama, Japan

Manuscript received August 5, 1998; revised manuscript received March 4, 1999, accepted April 30, 1999.

Reprint requests and correspondence: Dr. Hidetsugu Asanoi, Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan
hidetugu{at}ms.toyama-mpu.ac.jp

OBJECTIVES

The goals of this study were to elucidate the scaffolding effect of blood-filled coronary vasculature and to determine the functional role of recruited collateral flow in modulating left ventricular (LV) distensibility during balloon coronary occlusion (BCO).

BACKGROUND

Although LV distensibility is an important factor affecting acute dilation after myocardial infarction, the response of LV diastolic pressure–volume (P-V) relations to coronary occlusion is inconsistent in humans.

METHODS

Micromanometer and conductance derived LV P-V loops were serially obtained from 16 patients undergoing percutaneous transluminal coronary angioplasty. Coronary collateral flow recruitment was angiographically evaluated by contralateral and ipsilateral contrast injection during BCO.

RESULTS

In the group with poor collateral flow (grades 0–I; n = 8), BCO resulted in a downward and rightward shift of the diastolic P-V relations, where end-diastolic volume (EDV) increased by 13% (p < 0.05) without appreciable change in end-diastolic pressure (EDP; 18 ± 6 to 18 ± 8 mm Hg). In contrast, BCO in the group with good collateral flow (grades II–III; n = 8) shifted the diastolic P-V relations upward to the right with a concomitant increase in minimal pressure (min-P; 6 ± 4 to 10 ± 5 mm Hg, p < 0.05), EDP (15 ± 7 to 21 ± 9 mm Hg, p < 0.05) and EDV (+10%, p < 0.05). Reactive hyperemia after balloon deflation caused a rapid and parallel upward shift of the diastolic P-V relations with a marked increase in min-P and EDP, especially in the group with poor collateral flow, before any improvement in LV contraction or relaxation abnormalities.

CONCLUSIONS

Grades of coronary filling, either retrograde or anterograde, abruptly modulate LV distensibility through the rapid scaffolding effect of coronary vascular turgor.

Abbreviations and Acronyms   BCO = balloon coronary occlusion   ECG = electrocardiographic or electrocardiogram   EDP = end-diastolic pressure   EDV = end-diastolic volume   EF = ejection fraction   ESV = end-systolic volume   LV = left ventricle or ventricular   Min-P = minimal pressure   P-V = pressure–volume

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