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[Changes in heart rhythm and conduction during surgical treatment of ischemic heart disease]
Insights
Coronary artery bypass grafting and aneurysm resection significantly improved cardiac conductivity and excitability disorders in patients. These positive effects on arrhythmias and heart block persisted long-term, enhancing patient outcomes.
Area of Science:
- Cardiology
- Cardiac Surgery
Background:
- Investigating the impact of surgical interventions on cardiac electrical function.
- Assessing the efficacy of coronary flow recovery and aneurysm resection in managing arrhythmias and conduction abnormalities.
Observation:
- Studied 76 patients for conductivity disorders and 35 for excitability disorders.
- Aortal-coronary shunting resolved ventricular extrasystole in 13/17 patients and normalized His bundle block in all 12.
- Aneurysm resection normalized rhythm in 5/7 patients with ventricular extrasystole and resolved atrial fibrillation in 2/2.
Findings:
- Coronary artery bypass grafting (CABG) effectively treated ventricular extrasystole and His bundle block.
- Aneurysm resection successfully managed ventricular extrasystole and paroxysmal atrial fibrillation.
- Persistent conductivity and excitability disorders were noted in cases of scarred myocardium despite revascularization.
Implications:
- Surgical restoration of coronary flow and aneurysm removal can significantly improve cardiac electrical stability.
- These interventions offer long-term benefits for patients with specific arrhythmias and conduction defects.
- Identifying the etiology of disorders (e.g., scar tissue) is crucial for predicting treatment outcomes.
Abstract:
The effect of coronary flow recovery and/or aneurism resection on the pattern of conductivity disorders was examined in 76, and that of excitability disorders, in 35 patients. Aortal-coronary shunting eliminated ventricular extrasystole in 13 of 17 patients, normalized conductive function in all 12 patients with transitory block of the His bundle's anterior left branch, while their general clinical condition improved. Functional conductivity and excitability disorders due to scarry myocardial changes persisted in spite of revascularization procedure. Following aneurism resection, cardiac rhythm returned to normal in 5 of the 7 patients with ventricular extrasystole, while in 2 patients with paroxysmal atrial fibrillation paroxysms disappeared, a fact attributable to the removal of ectopic excitement focus and improved intracardiac hemodynamics. In all cases, conductivity and excitability improvement and normalization occurred during the early postoperative period and were maintained for long terms (up to ten years).