Extreme Heat Limited Oxygen Delivery in People With Heart Problems

About one-third of people with preexisting heart disease who were exposed to very high temperatures experienced asymptomatic heat–induced cardiac ischemia, or poor oxygen delivery to the heart, a recent study published in Annals of Internal Medicine found. The findings were based on data from 61 participants: 41 healthy young and older adults as well as 20 older people with coronary artery disease (CAD).