Related Experiment Videos
Coronary tandem lesions: effect of exercise
A Gaglione1, O M Hess, M Buechi
1Department of Internal Medicine, University Hospital, Zurich, Switzerland.
American Heart Journal
|June 1, 1992
Summary
Coronary vasomotion in tandem lesions shows exercise-induced vasoconstriction in both stenoses. Proximal lesion narrowing decreases with increased severity of the distal lesion, indicating complex interactions.
Area of Science:
- Cardiovascular Physiology
- Interventional Cardiology
Background:
- Coronary artery disease often involves multiple stenotic lesions.
- The behavior of tandem lesions under physiological stress is not fully understood.
Purpose of the Study:
- To investigate coronary vasomotion in patients with two stenoses in series (tandem lesions).
- To determine the influence of lesion severity on vasomotion during exercise and nitroglycerin administration.
Main Methods:
- Quantitative coronary arteriography was performed at rest, during two exercise levels, and after nitroglycerin in 10 patients.
- Measurements included percent area stenosis for each lesion (S1 and S2) and intervening segments.
Main Results:
- Both stenoses (S1 and S2) exhibited significant exercise-induced vasoconstriction (-29%, p<0.01).
- Vasoconstriction was reversible with nitroglycerin.
- The segment between stenoses showed no vasomotion, while normal segments dilated.
- A significant inverse correlation (r=0.84) was found between the severity of S2 and exercise-induced vasoconstriction of S1.
Conclusions:
- Coronary vasomotion in tandem lesions involves both active and passive mechanisms.
- Proximal lesion vasomotion is influenced by the severity of the distal lesion.