How did LeBron James' teenage son develop heart problems?

Today, we get the news that LeBron James' son Bronny collapsed during a basketball workout in California. He's in the ICU after a cardiac arrest.
Plus, here at home, we're dealing with intense heat and we're about to add Egyptian dust to the skies to provide a dangerous combination to heart patients. On today's Ask The Expert, Dr. Fahmi Farah joined us from Bentley Heart Health.