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Minimal coronary stenoses and left ventricular blood flow during CPR
1Department of Internal Medicine, University of Arizona College of Medicine, University Medical Center, Tucson.
Annals of Emergency Medicine
|September 1, 1992
Summary
A 33% coronary stenosis did not affect myocardial blood flow during normal sinus rhythm. However, during cardiopulmonary resuscitation (CPR), this minimal stenosis significantly reduced subendocardial blood flow, impacting perfusion.
Area of Science:
- Cardiovascular Physiology
- Resuscitation Science
Background:
- Coronary artery stenosis can impair myocardial blood flow.
- The impact of minimal stenoses on myocardial perfusion during cardiac arrest and cardiopulmonary resuscitation (CPR) is not fully understood.
Purpose of the Study:
- To evaluate the effect of a 33% coronary stenosis on myocardial blood flow during normal sinus rhythm and CPR.
Main Methods:
- A prospective study in swine models with a 33% stenosis in the mid-left anterior descending coronary artery.
- Myocardial blood flow was measured using colored microspheres proximal and distal to the stenosis.
- Measurements were taken during normal sinus rhythm and at 3 and 8 minutes of CPR.
Main Results:
- During normal sinus rhythm, the 33% stenosis did not alter myocardial blood flow quantity or distribution.
- During CPR, the stenosis significantly reduced endocardial/epicardial flow ratios compared to normal sinus rhythm.
- At 8 minutes of CPR, endocardial blood flow was significantly lower distal to the stenosis compared to proximal.
Conclusions:
- Minimal coronary stenoses, not affecting perfusion under normal conditions, can significantly impair subendocardial blood flow during cardiac arrest and CPR.
- These findings highlight the vulnerability of subendocardial perfusion in the presence of even minor coronary lesions during resuscitation efforts.