Diagnosing type 2 myocardial infarction in clinical routine. A validation study

Area of Science:

• Cardiology
• Clinical Research
• Medical Informatics

Background:

• The Swedish registry for myocardial infarction (SWEDEHEART) classifies MI subtypes since 2010.
• Previous studies have utilized SWEDEHEART for type 2 MI research.
• The accuracy of SWEDEHEART's type 2 MI classification has not been validated.

Purpose of the Study:

• To validate the accuracy of type 2 myocardial infarction (MI) classification within the SWEDEHEART registry.
• To compare SWEDEHEART's MI classification against a gold standard based on The Third Universal Definition of MI.

Main Methods:

• Retrospective classification of 772 MI patients from 2011 using SWEDEHEART data.
• Independent reviewers applied The Third Universal Definition of MI as the gold standard.
• Comparison of gold standard classification with SWEDEHEART registry data.

Main Results:

• SWEDEHEART classified 6.2% of patients as type 2 MI, versus 12.0% by the gold standard.
• Positive predictive value for type 2 MI in SWEDEHEART was 62.5%.
• Moderate agreement (κ=0.43) was observed between SWEDEHEART and the gold standard for type 2 MI.

Conclusions:

• SWEDEHEART demonstrates moderate agreement with the gold standard for type 2 MI classification.
• Studies relying on SWEDEHEART for type 2 MI diagnosis should be interpreted with caution.
• The SWEDEHEART registry significantly underestimates type 2 MI prevalence and is not suitable for such studies.