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Updated: Jun 11, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Instantaneous coronary collateral function during supine bicycle exercise.

Mario Togni¹, Steffen Gloekler, Pascal Meier

¹Department of Cardiology, University Hospital, CH-3010 Bern, Switzerland.

European Heart Journal

|June 30, 2010

Summary

This summary is machine-generated.

Coronary collateral flow instantaneously doubles during exercise in patients with non-occlusive coronary artery disease (CAD). This study investigated the immediate response of collateral circulation to physical activity in these patients.

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Area of Science:

Cardiology
Physiology

Background:

The response of collateral circulation to exercise in non-occlusive coronary artery disease (CAD) is not well understood.
Collateral vessels play a crucial role in supplying blood to ischemic areas of the heart.

Purpose of the Study:

To investigate the instantaneous response of collateral circulation to isometric physical exercise in patients with non-occlusive CAD.
To quantify changes in collateral flow index (CFI) and coronary collateral conductance during exercise.

Main Methods:

Thirty patients with stable CAD undergoing percutaneous coronary intervention were included.
Collateral function was assessed using coronary angiography and myocardial contrast echocardiography before and during supine bicycle exercise.
Patients were randomized to 'rest first' or 'exercise first' groups to avoid confounding factors.

Main Results:

Collateral flow index (CFI) significantly increased from 0.168 at rest to 0.262 during exercise (P = 0.0002).
Coronary collateral conductance increased from 0.010 to 1.109 mL/min/100 mmHg during exercise (P < 0.0001).
The exercise-induced increase in CFI and conductance was consistent across both study groups.

Conclusions:

In patients with non-occlusive CAD, collateral flow instantaneously doubles during supine bicycle exercise compared to rest.
These findings highlight the dynamic nature of collateral circulation in response to physiological stress.