Low QRS voltages and left ventricular hypertrophy: a risky association.

LQRSV are relatively common (11%) in HCM and have clinical relevance, being predictive over a medium-term for a worsening functional class, incidence of stroke and ICD implant. Instead, LQRSV are rare (2.3%) in athletes, but may occasionally be a marker that raises suspicion for underlying cardiac disease at risk.