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Natural history and prognosis of unstable angina
Insights
A conservative treatment approach for unstable angina showed that persistent chest pain and significant ECG changes predicted poor outcomes. Non-smokers and those with prior angina history experienced more pain persistence.
Area of Science:
- Cardiology
- Internal Medicine
Background:
- Unstable angina is a critical condition requiring effective management strategies.
- Current treatment guidelines often involve routine use of beta blockers, calcium antagonists, and anticoagulants.
Purpose of the Study:
- To evaluate the outcomes of a conservative treatment approach for unstable angina without routine use of beta blockers, calcium antagonists, and anticoagulants.
- To identify predictors of unfavorable outcomes in patients with unstable angina.
Main Methods:
- A prospective study followed 100 patients admitted with unstable angina for 1 year.
- Treatment focused on nitrates and symptomatic relief for persistent pain; routine medications were avoided.
- Clinical data and electrocardiogram (ECG) changes were analyzed to identify outcome predictors.
Main Results:
- Within 28 days, there was 1 death and 9 nonfatal infarctions.
- Over 1 year, there were 8 deaths, 14 nonfatal infarctions, and 3 readmissions for unstable angina.
- Persistence of pain and extent of ECG ST-T changes were significant predictors of adverse outcomes.
Conclusions:
- A conservative management strategy for unstable angina can be assessed for its efficacy.
- Persistent chest pain and pronounced ECG abnormalities are key indicators for unfavorable prognosis in unstable angina patients.
- Factors like smoking status and prior angina history influence pain persistence, but beta-blocker timing did not significantly alter outcomes in this cohort.
Abstract:
One hundred patients admitted to coronary care with unstable angina were followed for a period of 1 year. A conservative approach to treatment was adopted. Routine beta blockers, calcium antagonists, and anticoagulants were not employed. Patients with persistent pain following admission were treated with nitrates only and with symptomatic treatment. One death and nine nonfatal infarctions occurred within the first 28 days after admission. A total of eight deaths, 14 nonfatal infarctions, and three readmissions for unstable angina occurred during the follow-up period of 1 year. Of the various initial factors studied, persistence of pain and the magnitude and extent of ECG ST-T changes were the only predictors of an unfavorable outcome. Non-smokers and those with a previous history of angina on effort had a significantly higher incidence of persistence of pain. The withdrawal of beta blockers on admission and the late administration of beta blockers to those with persistent pain did not appear to influence outcome.