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Reversibility of left ventricular asynergy by nitroglycerin in coronary artery disease
Insights
Post-nitroglycerin ventriculography helps assess reversible left ventricular asynergy in coronary artery disease patients. This method distinguishes between irreversible, partially reversible, and completely reversible asynergy, aiding treatment strategies.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Left ventricular asynergy is a concern in coronary artery disease (CAD).
- Assessing the reversibility of asynergy is crucial for guiding therapeutic interventions.
Purpose of the Study:
- To evaluate the utility of post-nitroglycerin left ventriculography in determining the reversibility of left ventricular asynergy in CAD patients.
Main Methods:
- Left ventriculography was performed before and after nitroglycerin administration in 32 CAD patients.
- Ejection fraction and systolic shortening were analyzed.
- Control groups (normal ventricles, no nitroglycerin) were included for comparison.
Main Results:
- Nitroglycerin significantly improved asynergy in some CAD patients, categorizing it as partially or completely reversible.
- Patients without prior myocardial infarction showed varying degrees of reversibility.
- Normal ventricles and controls without nitroglycerin showed minimal changes.
Conclusions:
- Post-nitroglycerin ventriculography is a valuable tool for assessing left ventricular asynergy reversibility in CAD.
- This technique aids in differentiating between irreversible and reversible myocardial dysfunction.
Abstract:
To evaluate the potential reversibility of left ventricular asynergy in patients with coronary artery disease, pre- and postnitroglycerin left ventriculography was performed in 32 subjects. In four other subjects left ventriculography was repeated without intervention of nitroglycerin. Changes in ejection fraction and percentage of systolic shortening of three minor axes from the first to the second angiogram were then calculated. Changes were not significant for the myocardial infarction group or for the control group without the intervention of nitroglycerin. Normal left ventricles showed small but significant changes (p less than 0.05). Patients with coronary artery disease but without previous myocardial infarction who demonstrated asynergy in their first angiogram showed three types of response: (1) no significant change (p less than 0.05)-irreversible asynergy; (2) significant change (p less than 0.025) with residual dysfunction-partially reversible asynergy; (3) significant change (p less than 0.001) without residual dysfunction-completely reversible asynergy. It is concluded that postnitroglycerin ventriculography is useful in assessing the reversibility of left ventricular asynergy in patients with coronary artery disease.