Platelet Function Analyzer 100 and Brain Natriuretic Peptide as Biomarkers in Obstructive Hypertrophic Cardiomyopathy

Area of Science:

• Cardiology
• Biomarker Discovery
• Genetic Cardiology

Background:

• Hypertrophic cardiomyopathy (HC) is a significant cause of heart disease.
• Current screening methods like electrocardiogram (ECG) have limitations in sensitivity and specificity.
• There is a need for more effective screening tools for early detection of HC.

Purpose of the Study:

• To evaluate the efficacy of dual blood biomarkers, platelet function analyzer (PFA)-100 and normalized B-type natriuretic peptide (BNP/ULN), for hypertrophic cardiomyopathy (HC) screening.
• To compare the diagnostic performance of these biomarkers against the electrocardiogram (ECG).

Main Methods:

• Measured PFA-100 and BNP/ULN in patients with HC and normal controls (NCs).
• Derived estimated PFA from a regression equation with PFA and gradient.
• Calculated sensitivity and specificity of single and dual biomarkers (PFA × BNP/ULN) compared to ECG in various HC classifications (obstructive, latent, nonobstructive).

Main Results:

• The product of PFA × BNP/ULN showed near-complete separation of values between obstructive HC patients and NCs.
• Estimated PFA × BNP/ULN achieved 93% sensitivity and 100% specificity for class I obstructive HC, significantly outperforming ECG (71% sensitivity).
• BNP/ULN was elevated in HC patients regardless of mutation status or family history, indicating no specific elevation based on these factors.

Conclusions:

• Platelet function analyzer (PFA) and B-type natriuretic peptide (BNP) are strongly associated with obstructive hypertrophic cardiomyopathy (HC) and show potential for screening.
• The combined use of PFA and BNP/ULN demonstrates superior diagnostic accuracy compared to ECG for HC screening, particularly in obstructive forms.
• BNP levels are not uniquely elevated in familial or mutation-positive HC, suggesting its utility is primarily in assessing cardiac strain rather than genetic predisposition.