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Clinicians didn't reliably distinguish between different causes of cardiac death using case histories
Jonathan Mant1, Sue Wilson, Jayne Parry
1Department of Primary Care and General Practice, Primary Care Clinical Sciences Building, University of Birmingham, Birmingham B15 2TT, United Kingdom. j.w.mant@bham.ac.uk
Insights
Physician agreement on cardiac death causes is limited, impacting epidemiological studies. Improving accuracy in determining the underlying cause of death is crucial for reliable cardiovascular disease research.
Area of Science:
- Cardiology
- Epidemiology
- Medical Statistics
Background:
- Distinguishing cardiac death types is common in routine statistics and epidemiological studies.
- Accurate cause of death determination is vital for public health surveillance and research.
Purpose of the Study:
- To assess inter-physician agreement on cardiac cause of death using identical clinical information.
- To evaluate agreement between a physician panel's consensus and the officially coded cause of death.
Main Methods:
- A panel of eight clinicians reviewed 400 cardiac death cases with clinical information and autopsy reports.
- Physicians independently assigned the underlying cause of death, blinded to the certified cause.
- Agreement was measured using the kappa statistic, with consensus reached for panel decisions.
Main Results:
- Physician agreement on cause of death was 54% (kappa = 0.34).
- The physician panel's consensus agreed with the death certificate diagnosis in 61.5% of cases (kappa = 0.39).
- Agreement improved to kappa = 0.49 when an autopsy had been performed.
Conclusions:
- The process for determining the underlying cause of cardiac death demonstrates limited reliability and accuracy.
- Findings have significant implications for the design and interpretation of cardiovascular disease epidemiological studies and clinical trials.
Background And Objectives:
Routine statistics and epidemiologic studies often distinguish between types of cardiac death. Our aim was to assess agreement between doctors on cause of death given identical clinical information, and to assess agreement between a physician panel and the original cause of death as coded on national statistics.
Methods:
Clinical information and autopsy reports on 400 cardiac deaths were randomly selected from a defined population in the West Midlands, UK. A panel of eight clinicians was assembled, and batches of 24-25 cases were sent to pairs of these clinicians who, blinded to the certified cause of death, independently of each other assigned underlying cause of death. Physician panel decision was achieved by consensus. Levels of agreement were assessed using the kappa statistic.
Results:
Reviewers agreed on cause of death in 54% of cases (kappa = 0.34). Consensus decision of reviewers agreed with death certificate diagnosis in 61.5% (kappa = 0.39). Agreement was higher if an autopsy had been performed (kappa = 0.49).
Conclusion:
The process of identifying underlying cause of death is of limited reliability, and therefore, limited accuracy. This has implications for design of epidemiologic studies and clinical trials of cardiovascular disease.
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