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[Effects of aortocoronary bypass surgery on left ventricular wall motion. Ventriculographic results (author's
Insights
Aortocoronary bypass surgery impacts left ventricular contraction, with successful grafts maintaining function. However, occluded grafts depress function, while some patients show improved ventricular performance post-surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Imaging
Context:
- Aortocoronary bypass surgery is a common intervention for coronary artery disease.
- Assessing the impact on left ventricular (LV) function is crucial for patient outcomes.
- Ventriculography provides detailed regional and global LV contraction pattern analysis.
Purpose:
- To evaluate the effects of aortocoronary bypass surgery on the left ventricular contraction pattern.
- To analyze changes in global and regional LV function parameters post-surgery.
Summary:
- Ventriculograms of 29 patients undergoing aortocoronary bypass surgery were analyzed.
- Global LV volumes, ejection fraction, and fiber-shortening velocity showed no significant changes for the entire group.
- Regional wall motion analysis revealed positive effects, particularly in specific patient subgroups, with improvements in asynergic segments and percentual shortening.
Impact:
- Successful bypass grafting in patients with normal LV function preserves postoperative function.
- Occluded grafts lead to depressed LV function, sometimes with perioperative myocardial infarction.
- A significant proportion (75%) of patients with preoperative depressed LV function without infarction evidence showed improvement or normalization post-surgery.
- Patients with preoperative myocardial infarction and successful grafts experienced beneficial effects on LV function, with increased wall motion in previously asynergic areas.
Abstract:
In order to evaluate the effects of aortocoronary bypass surgery on left ventricular contraction pattern the ventriculograms of 29 patients were analyzed. For the entire group no changes were found by the evaluation of left ventricular volumes, ejection fraction and circumferential fiber-shortening velocity. The analysis of the regional wall motion (number of asynergic segments, ventricular score, percentual shortening of the hemiaxis) demonstrated positive effects on regional contraction pattern--especially in subgroups. We conclude: 1. a normal left ventricular function associated with successful bypass grafting remains unchanged postoperatively (n = 8); 2. occluded grafts result in a depression of left ventricular function, sometimes accompanied by perioperative myocardial infarctions (n = 13); 3. in a high degree (75%) it is possible to improve or normalize a preoperative depressed ventricular performance in patients without electrocardiographic evidence of a myocardial infarction (n = 12); 4. patients with preoperative myocardial infarctions and successful bypass surgery can have beneficial effects on left ventricular function by an increase in wall motion in additional areas with asynergy without infarction scare (n = 4).