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Effect of myocardial revascularization on the left ventricular function. Diagnosis of reversible contraction
Insights
Myocardial revascularization improved left ventricular function in patients with impaired contractility. Improvements in global and segmental function were observed post-surgery, particularly in revascularized areas.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Physiology
Background:
- Left ventricular (LV) function is critical after myocardial revascularization.
- Assessing early postoperative LV function is essential for patient outcomes.
Purpose of the Study:
- To evaluate left ventricular function in the early postoperative period following myocardial revascularization.
- To identify predictors of functional improvement after surgery.
Main Methods:
- Left ventricular cineangiograms were used to assess cardiac function in 28 male patients.
- Patients had patent aorto-coronary grafts and no new Q waves on ECG.
- Preoperative assessment included sublingual nitroglycerin and postextrasystolic potentiation.
Main Results:
- Global left ventricular function improved in patients with reduced ejection fraction and segmental contraction disturbances.
- Segmental contractions significantly improved in revascularized areas with prior impairment.
- Preoperative stimuli (nitroglycerin, potentiation) predicted postoperative functional changes.
Conclusions:
- Myocardial revascularization positively impacts left ventricular function early post-surgery.
- Improved contractility in revascularized segments suggests successful surgical intervention.
- Preoperative functional assessments can predict the extent of postoperative recovery.
Abstract:
Function of the left ventricle was evaluated in 28 men during the early postoperative period after myocardial revascularization by left ventricular cineangiograms. The group was characterized by patency of all aorto-coronary grafts and the absence of a new Q waves on the ECG. Improvement of the global left ventricular function occurred in a sub-group of patients with reduced ejection fraction before operation as well as in patients with segmental disturbances of left ventricular contraction. The segmental contractions improved significantly in the revascularized areas where prior to operation the function was impaired. The postoperative change was in some patients predicted before operation by administration of sublingual nitroglycerin and by means of postextrasystolic potentiation. We found the same trend of changes produced by the above stimuli and by revascularization.