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[Non arrhythmogenic sudden death as complication of coronary heart disease]
Insights
Sudden cardiac death within 24 hours of admission for acute myocardial ischemia is linked to specific causes like cardiac rupture or pump failure. Beta blockers may increase pump failure risk in unstable angina patients.
Area of Science:
- Cardiology
- Internal Medicine
Context:
- Acute myocardial ischemia, encompassing unstable angina pectoris and acute myocardial infarction, presents a significant risk for early sudden cardiac death.
- A cohort of 417 patients admitted to a Coronary Care Unit revealed 21 cases of non-arrhythmogenic sudden death within 24 hours of admission.
Purpose:
- To investigate the causes and risk factors associated with early non-arrhythmogenic sudden death in patients with acute myocardial ischemia.
- To evaluate the role of beta-blocker therapy in patients experiencing acute pump failure.
Summary:
- Of 21 early sudden deaths, 16 occurred in acute myocardial infarction patients (12 cardiac rupture, 4 pump failure) and 5 in unstable angina patients (all pump failure).
- Patients with cardiac rupture within 24 hours had higher blood pressure compared to other groups.
- Beta-blocker therapy was associated with pump failure in unstable angina patients, suggesting potential risks and contraindications.
Impact:
- Identifies specific mechanisms (cardiac rupture, pump failure) contributing to early mortality in acute myocardial ischemia.
- Highlights the potential adverse effects of beta-blockers in a subset of unstable angina patients, necessitating careful patient selection and monitoring.
- Suggests that rapid coronary angiography and bypass surgery may be crucial for managing high-risk unstable angina patients experiencing acute pump failure.
- Recommends avoiding or discontinuing beta-blockers in patients with unstable angina who exhibit signs of impending pump failure or lack of therapeutic response.
Abstract:
In a cohort of 417 patients admitted consecutively to the Coronary Care Unit for acute myocardial ischemia (unstable angina pectoris in 121, acute myocardial infarction in 296 patients) 21 cases of non arrhythmogenic sudden death occurred within 24 hours after admission. 16 of these patients suffered from acute myocardial infarction and 5 from unstable angina pectoris. Cause of death was cardiac rupture in 12 and pump failure in 4 patients with acute myocardial infarction, whereas all patients with unstable angina pectoris died from pump failure. Patients with cardiac rupture within 24 hours after admission, had significantly higher systolic and diastolic blood pressure in comparison with the other groups and with patients dying from cardiac rupture on the third day, or later. All patients dying from pump failure with unstable angina pectoris and one of the patients dying from pump failure with acute myocardial infarction had beta blocker therapy. Beta blockers were given to 68 of the patients with unstable angina pectoris. Acute pump failure occurred in this group only. The risk of pump failure with beta receptor blocking drugs is indicated by angina decubitus, marked dyspnea during anginal attacks (even in patients free of signs of cardial insufficiency outside their attacks) and a lack of responsiveness to beta blocking therapy. In these patients rapid coronary angiography and bypass surgery seems to be the prefered method of management. Beta blockers should not be given to these patients or discontinued in cases which lack responsiveness.