Compound Mutation in Cardiac Sarcomere Proteins Is Associated with Increased Risk for Major Arrhythmic Events in Pediatric Onset Hypertrophic Cardiomyopathy.

There was a trend toward increased left atrial parameters and decreased EF in TTE in patients with compound mutations compared to single-mutation carriers, but the findings did not reach statistical significance, possibly due to small patient numbers ( p -value 0.056).

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