Dr Shailesh Singh, an interventional heart specialist, shared on X (previously Twitter) how even the fittest people could unknowingly carry this silent menace. “You hit the health club six days per week, no chest ache, no dizziness, resting coronary heart fee 52. However your ventricular septum is 18mm thick, regular is beneath 12mm. You've gotten hypertrophic cardiomyopathy,” he wrote, explaining how households usually mistake sudden deaths in younger members as “freak accidents”.