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Updated: Jul 7, 2026

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Published on: July 21, 2012
Microvascular angina beyond risk markers: the need for endotype-specific validation
Abdülmelik Birgün1, Abdullah Sarıhan2, Macit Kalçık3
1Department of Cardiology, Hitit University Erol Olçok Education and Research Hospital, Çorum, Turkey. melikbirgun@gmail.com.
Abstract:
This letter discusses methodological limitations of a retrospective case-control study evaluating HbA1c, HDL-C, and hemoglobin levels in microvascular angina. Although the findings are clinically interesting, differences in control phenotyping, incomplete CFR assessment, medication confounding, and endotype heterogeneity limit causal interpretation. Prospective, mechanism-based validation is needed before these variables are accepted as therapeutic targets.
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