A new JAMA research letter by Jordana Cohen, MD, MSCE, Deputy Director and Associate Professor of Medicine and Epidemiology, uses nationally representative data to evaluate the Apple Watch Hypertension Notification Feature on a population level. The study finds that receiving an alert substantially increases the likelihood of having hypertension. However, the absence of an alert provides little reassurance, which could lead to false confidence among those who do not receive one. As cuffless technologies enter routine use, understanding how to interpret their signals will be essential for both patients and clinicians.
In the underlying validation data, about 41 % of people with undiagnosed hypertension received an alert, while nearly 59 % did not. Among those without hypertension, roughly 8 % received an inappropriate alert. These findings highlight that while alerts can help identify potential cases, they cannot replace traditional blood pressure screening and should be interpreted carefully in clinical and public health settings.