Study Reveals Blood Pressure Changes During Extreme Heat in 4.2 Million Visits

A large study published in JAMA Network Open, analyzing 4.2 million outpatient visits, found that extreme heat was associated with lower systolic and diastolic blood pressure, particularly in adults aged 65 years or older. The findings suggest a population-wide shift in blood pressure during heat exposure, with the largest reductions observed on the day of the encounter and one day prior.