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Coronary care unit utilization in Hamilton, Ontario, a city of 375,000 people
1Department of Medicine, McMaster University, Hamilton, Ontario.
Insights
This study tracked cardiac admissions in Hamilton, Ontario, revealing acute myocardial infarction (AMI) and unstable angina as key diagnoses. Hospital mortality for AMI was 15.2%, with higher rates in older patients.
Area of Science:
- Cardiology
- Public Health
- Epidemiology
Background:
- Coronary care units (CCUs) and intensive care units (ICUs) manage critical cardiac events.
- Understanding admission patterns and outcomes is crucial for resource allocation and patient care.
- Previous data on cardiac admission characteristics and mortality in Hamilton, Ontario, is limited.
Purpose of the Study:
- To document and analyze all cardiac admissions to CCUs and ICU overflow beds in Hamilton, Ontario.
- To determine the incidence, diagnosis, and outcomes of acute myocardial infarction (AMI) and other chest pain admissions.
- To assess the accuracy of initial diagnoses for AMI and evaluate mortality rates.
Main Methods:
- Prospective documentation of all cardiac admissions to CCUs and ICU overflow beds over a one-year period (1979-80).
- Analysis of patient demographics, admission diagnoses, length of stay, and mortality.
- Calculation of hospitalization rates, diagnostic accuracy (sensitivity and positive predictive value), and age-specific mortality for AMI.
Main Results:
- A total of 4180 cardiac admissions were recorded, with 89% to CCUs.
- Acute myocardial infarction (AMI) accounted for 22% of CCU admissions, unstable angina for 24%, and other chest pain for 21%.
- The hospitalization rate for AMI was 224 per 100,000. Hospital mortality for AMI was 15.2% (17.6% including ICU overflow). Diagnostic sensitivity for AMI was 69%, and positive predictive value was 72%. Age-specific mortality for AMI was significantly higher in individuals over 70 years (32.8%) compared to those aged 45-64 (9.7%).
Conclusions:
- Cardiac admissions, particularly for acute myocardial infarction and unstable angina, represent a significant burden on CCUs.
- Diagnostic accuracy for AMI on admission requires improvement.
- Mortality rates for AMI remain substantial, with a pronounced increase in older populations, highlighting the need for targeted interventions.
Abstract:
All cardiac admissions to coronary care unit (CCU) beds and all intensive care unit (ICU) overflow admissions in Hamilton, Ontario, a city of 375,000 people, were documented over a one-year period, 1979-80. There were 4180 such admissions, 89% of them to CCUs. In the CCUs, 22% of patients had acute myocardial infarction, 24% unstable angina and 21% other chest pain. For myocardial infarction, hospitalization rate was 224 per 100,000, hospital mortality 42 per 100,000 and 48% of all myocardial infarction deaths in the community occurred in hospital. Of all myocardial infarction patients admitted to the CCU, 69% were correctly diagnosed on admission (sensitivity) and of all the admission diagnoses of myocardial infarction, 72% were eventually found to be correct (positive predictive value). Mean values for CCU patients overall were age 62.5 years, CCU stay 2.88 days and hospital stay 9.7 days; and for acute myocardial infarction patients in CCUs, age 63.4 years, CCU stay 3.98 days and hospital stay 13.28 days. For myocardial infarction, CCU mortality was 10.9%, hospital mortality 15.2% and, with the inclusion of ICU overflow patients, hospital mortality was 17.6%. Age-specific mortality for myocardial infarction was 9.7% age 45 to 64 years, and 32.8% over 70 years.