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[Indication for coronary surgery with special reference to hemodynamic results]
Insights
Coronary artery bypass surgery offers significant relief from angina and improves physical capacity in most patients. However, its superiority over conservative treatment is not yet definitively proven, except for left main coronary artery stenosis.
Area of Science:
- Cardiovascular Surgery
- Cardiac Rehabilitation
- Myocardial Ischemia Research
Context:
- Coronary artery bypass surgery (CABS) aims to improve angina, physical capacity, myocardial oxygen supply, function, and longevity.
- Pre-operative assessment of patient outcomes is crucial for determining surgical indication.
- Understanding the correlation between bypass graft patency and clinical improvement is essential.
Purpose:
- To analyze the effectiveness of coronary artery bypass surgery in achieving its intended therapeutic goals.
- To evaluate patient outcomes, including angina relief, physical working capacity, and myocardial function post-surgery.
- To compare surgical outcomes with conservative treatment and identify specific indications for CABS.
Summary:
- Post-operative analysis of 87 patients showed complete angina subsidence in 48% and considerable improvement in 32%.
- Physical working capacity improved significantly in 73% of patients; a good correlation exists between functioning bypasses and symptom relief, though exceptions occur.
- Myocardial function normalization was achieved in some patients, with a general correlation between improved function and capacity, but discrepancies were noted.
Impact:
- Surgical treatment superiority over conservative methods remains unproven, except for left main coronary artery stenosis.
- Indications for CABS should focus on intractable angina and prevention of impending complications, rather than solely prognostic considerations.
- The study highlights the complex relationship between surgical intervention, graft patency, myocardial function, and patient-reported outcomes in coronary artery disease management.
Abstract:
An analysis is made whether and how far the aims of coronary artery bypass surgery improvement or relief of angina, improvement of the physical working capacity, improvement of the oxygen supply of ischemic myocardium, improvement of the myocardial function, improvement of longevity, can be attained. 48 percent of 87 patients had complete subsidance of angina pectoris after operation. There was a considerable improvement in 32 percent, no change in 14 percent, and a deterioration in 6 percent. After operation, the working capacity was improved in 73 percent of our patients significantly, in some cases nearly unlimited. By a comparison between loss of complaints and bypass function (open or closed) we found a good correlation between functioning bypasses and complaints. But there are some cases without complaints in spite of a closure of the bypass. Also the reverse, unchanged complaints in spite of an open bypass, was seen. A normalisation of preoperative disturbed myocardial function can be attained. Significant improvements, but also deteriorations can be found. Generally, there is a good correlation between improved myocardial function and improvement of the working capacity. Yet there is not rarely a discrepancy between a significant improvement of the working capacity and the left ventricular function. The explanation may be a loss or a postoperative augmented threshold for anging pectoris. Comparing the groups of patients with conservative and surgical treatment, the superiority of surgical treatment cannot be proved as yet. An exception seems to be the stenosis of the left main coronary artery. With this exception, prognostic considerations cannot play a role for the indication of a coronary bypass operation. Aspects for the indication of coronary surgery are untractable or disabling angina pectoris and the consideration how impending complications can be prevented.