LeBron James son cardiac arrest during practice. Leaves ICU

...All 3 athletes exhibited arrhythmias with a RBBB configuration, which was concordant with the LV location of LGE, whereas CMR was negative in all athletes with LBBB arrhythmias and control athletes. These findings are in agreement with previous studies showing that a RBBB‐like morphologic feature of VA, but not LBBB, predicts the presence of an underlying LV scar.20 Moreover, in athletes showing VA with a LBBB morphologic feature, no abnormalities of the right ventricle were evidenced by both echocardiography and CMR using dedicated morphofunctional and postcontrast views.

The clinical relevance of this finding is that nonischemic LV scar is an increasingly reported cause of life‐threatening VAs and SCD in the athletes, often undetected by routine electrocardiographic and echocardiographic screening.1 However, this perspective is based on previous observations on selected athletes who were referred to tertiary center or experienced cardiac arrest. The risk of SCD during sports activity and recommendations for sports eligibility of the low (but not negligible, ≈1%) proportion of our asymptomatic athletes with VA and LV LGE remain to be established.

In 2011, researchers from the University of Washington at Seattle used an NCAA database, public media reports, and catastrophic insurance claims to come up with an incidence rate for sudden cardiac death among students who died suddenly during exercise. They found that 75 percent of sudden deaths among student athletes who died during exercise could be traced to cardiovascular causes and that the current methods of collecting data underestimate the risk of sudden cardiac death.

The NCAA itself found that the risk of a male athlete dying from sudden cardiac arrest is one in 38,000 and only one in about 122,000 for female athletes. Basketball, soccer, and football players appear to be at the greatest risk — though only 4 percent of NCAA athletes are basketball players, they represent a full 20 percent of all sudden cardiac deaths.