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Time trends in prognosis of patients with myocardial infarction: a population-based study
Insights
Coronary care units (CCUs) significantly reduced in-hospital deaths from acute myocardial infarction (MI) between 1966/67 and 1971. Long-term prognosis for survivors remained unchanged, suggesting limited therapeutic advances.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Acute myocardial infarction (MI) poses a significant public health challenge.
- Coronary care units (CCUs) were established to improve outcomes for MI patients.
- Assessing the evolving effectiveness of CCUs is crucial for optimizing cardiac care.
Purpose of the Study:
- To compare the in-hospital case-fatality rate (CFR) and long-term prognosis of acute myocardial infarction (MI) patients between two distinct time periods.
- To evaluate the impact of coronary care unit (CCU) admission on MI patient outcomes over time.
- To identify potential changes in the effectiveness of CCUs in reducing mortality.
Main Methods:
- A population-based study comparing 504 acute myocardial infarction (MI) patients from 1966/67 with 803 MI patients from 1971 in metropolitan Baltimore.
- Analysis of in-hospital case-fatality rates (CFRs) and long-term prognosis for patients admitted to coronary care units (CCUs) versus those not admitted.
- Statistical adjustment for 16 potential prognostic variables to ensure robust comparisons.
Main Results:
- The in-hospital CFR for patients admitted to CCUs significantly decreased from 27.5% in 1966/67 to 20% in 1971 (p < .025).
- No significant difference in CFR was observed for non-CCU patients between the two periods.
- CCU patients demonstrated a significant survival advantage in 1971 compared to non-CCU patients, an advantage not present in 1966/67.
Conclusions:
- The effectiveness of coronary care units (CCUs) in preventing in-hospital deaths from acute myocardial infarction (MI) increased between 1966/67 and 1971.
- No significant differences in long-term prognosis were found for hospital survivors between the two study periods.
- The lack of improvement in long-term outcomes may indicate a stagnation in therapeutic advancements for coronary atherosclerosis and infarct size reduction during that era.
Abstract:
A population-based study was conducted in metropolitan Baltimore, in which the prognosis of 504 patients hospitalized with acute myocardial infarction (MI) from July 1966 through June 1967 was compared with that of 803 patients hospitalized from January through December 1971. For patients admitted to coronary care units (CCUs), the in-hospital case-fatality rate (CFR) in 1971 (20%) was found to be significantly lower than that in 1966/67 (27.5%) (p less than .025), after simultaneous adjustment for 16 variables which may affect prognosis. No such significant difference was detected for patients not admitted to CCUs when the two time periods were compared. As a result of these time trends, CFRs were not significantly different between CCU and non-CCU patients in 1966/67, but in 1971 a significant advantage was shown for CCU patients (p less than .005). These results suggest that effectiveness of CCUs in prevention of in-hospital deaths increased between 1966/67 and 1971. For hospital survivors, regardless of admission to a CCU, no significant differences in long-term prognosis were found between patients discharged in 1971 and those discharged in 1966/67. This finding may reflect the lack of major therapeutic advances between the two study periods, aimed at reducing the progression of coronary atherosclerosis and/or the extent of the infarcted area.