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[Complete revascularization surgery in patients with coronary disease with severely reduced left ventricular
Insights
Complete revascularization surgery improved patients' clinical status and myocardial ischemia. However, left-ventricular function and regional wall motion did not show consistent, significant improvement post-surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Physiology
Context:
- Assessing left ventricular (LV) function and regional wall motion in patients with preoperative LV dysfunction and myocardial ischemia.
- Evaluating outcomes after complete revascularization surgery.
Purpose:
- To analyze the clinical data, function, and compliance of the left ventricle, as well as regional wall motion, in patients following complete revascularization surgery for pre-existing LV dysfunction and myocardial ischemia.
Summary:
- Seventeen patients with preoperative LV dysfunction and myocardial ischemia underwent complete revascularization. Post-surgery (average 5.2 months), patients improved by one NYHA class, with increased LV end-diastolic pressure (improved ischemia status). LV compliance decreased 30%, end-diastolic volume by 14%, and end-systolic volume by 20% (P < 0.05). Only 3 of 92 bypasses failed. All patients survived up to 22.4 months postoperatively in a satisfactory clinical state.
- While LV function and regional wall motion showed a tendency for improvement in most patients, pre- and postoperative mean values were not significantly different (P > 0.05). This discrepancy between improved clinical status/ischemia index and non-significant functional improvement remains unexplained.
Impact:
- Highlights a potential disconnect between subjective clinical improvement and objective measures of left ventricular function after revascularization.
- Suggests further research is needed to understand the factors influencing left ventricular functional recovery post-cardiac surgery.
- Emphasizes the need for sensitive assessment tools to accurately evaluate cardiac function changes after interventions.
Abstract:
Clinical data, function and compliance of left ventricle as well as regional wall motion were analysed in 17 patients with preoperatively limited left-ventricular function and signs of myocardial ischaemia after complete revascularisation surgery. Recatheterisation after 5.2 months on average after surgery showed improvement by one NYHA class, an increase of mean left-ventricular enddiastolic pressure, which was interpreted as "improved status of ischaemia", a decrease of left-ventricular compliance by 30%, of enddiastolic volume by 14% and of endsystolic volume by 20% (P less than 0.05). Loss of function occurred in 3 out of 92 bypasses. Up to the time of reporting, 22.4 months postoperatively, all patients have survived in a relatively satisfactory clinical state. All parameters of left-ventricular function as well as regional wall motion showed a tendency for improvement after surgery in the majority of patients. However, pre- and postoperative mean values were not significantly different (P greater than 0.05). Thus, despite clearcut improvement of clinical state and "ischaemia index", improvement of left-ventricular function and regional wall motion are not consistently demonstrable. The reasons of this discrepancy cannot be ascertained by this investigation. The quality of the surgical intervention and the sensitivity of parameter assessment cannot be held responsible.