Association of Diagnostic Code Priority With Identification of True Cardiac Arrest in Patients Presenting to the
Paulomi Gohel1, Aditi Naniwadekar1, Krishna Kancharla1
1Heart and Vascular Institute and Division of Cardiology-Department of Medicine at the University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA.
Insights
Administrative diagnostic codes for sudden cardiac arrest (SCA) are most accurate at rank #1. Lower ranks identify sicker patients but are less reliable for true SCA events, impacting research data interpretation.
Area of Science:
- Cardiology
- Health Informatics
- Epidemiology
Background:
- Sudden cardiac arrest (SCA) is a major cause of death, often coded as ventricular tachycardia (VT), ventricular fibrillation (VF), or unspecified SCA.
- The accuracy of these administrative diagnostic codes in research is uncertain.
- This study evaluates the link between diagnostic code rank and the likelihood of true SCA in emergency department patients.
Purpose of the Study:
- To assess the diagnostic accuracy of administrative codes for SCA.
- To determine the relationship between the priority rank of diagnostic codes and the occurrence of true SCA events.
- To inform the interpretation of health datasets using administrative codes.
Main Methods:
- A random sample of 380 patients with VT/VF/SCA codes from a larger cohort of 22,369 was selected for detailed chart review.
- True SCA events were defined as sustained VT/VF/SCA during hospitalization, not caused by non-cardiac factors.
- Diagnostic accuracy was assessed based on the code's priority rank.
Main Results:
- Manual review confirmed 65% of patients had true SCA events, and 55% had events unrelated to non-cardiac causes.
- Diagnostic accuracy was 100% for priority rank #1 and decreased significantly for lower ranks.
- In the full cohort, lower code ranks correlated with lower VT/VF/SCA recurrence (p=0.086) and higher all-cause mortality (p<0.001) over 1.5 years.
Conclusions:
- Administrative diagnostic codes for SCA have variable accuracy, with the highest precision at rank #1.
- Higher-priority codes better identify true SCA cases.
- Lower-priority codes may represent other serious in-hospital conditions, necessitating careful interpretation of research data.
Background:
Sudden cardiac arrest (SCA), a leading cause of mortality, is administratively coded as ventricular tachycardia (VT), ventricular fibrillation (VF), or unspecified SCA. Diagnostic codes are widely used in research, yet their accuracy in reflecting true SCA events is uncertain. The objective of this study is to evaluate the relationship between administrative diagnostic code rank (listing order) and the likelihood of true SCA in patients presenting to the emergency department (ED).
Methods:
From a database of 22 369 patients with VT/VF/SCA, we randomly selected 380 patients for detailed chart review. Diagnostic accuracy was confirmed when patients (1) had sustained a true VT/VF/SCA event during the index hospitalization and (2) when the event was not precipitated by non-cardiac causes.
Results:
Manual chart review for the 380 patients (age 71 ± 12 years, 53% women) confirmed that 65% experienced true VT/VF/SCA and 55% had an arrest unrelated to non-cardiac causes. Diagnostic accuracy was 100% at priority rank #1 and declined significantly at lower ranks. In the overall larger cohort of 22 369 patients, recurrence of VT/VF/SCA trended 3% lower (p = 0.086) and all-cause mortality was 5% higher (p < 0.001) with each diagnostic priority rank decrease, over a mean follow-up of 1.5 years.
Conclusion:
Diagnostic codes show variable predictive accuracy for true VT/VF/SCA events, with the highest accuracy at priority rank #1. Higher-priority codes identify patients most likely to have true SCA, while lower-priority codes capture sick patients with other in-hospital events. These results have important implications for the interpretation of administrative health datasets.
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