Cuffless blood pressure monitoring promises and challenges

Current BP measurements are on the basis of traditional BP cuff approaches. Ambulatory BP monitoring, at 15-to 30-minute intervals usually over 24 hours, provides sufficiently continuous readings that are superior to the officebased snapshot, but this system is not suitable for frequent repeated use. A true continuous BP measurement that could collectBPpassively andfrequently wouldrequire a cuffless method that couldbe wornby the patient, with the data stored electronically much the same way that heart rate and heart rhythm are already done routinely. Ideally, BP should be measured continuously and frequently during diverse activities during both daytime and nighttime in the same subject by means of novel devices. There is increasing excitement for newer methods to measure BP on the basis of sensors and algorithm development. As new devices are refined and their accuracy is improved, it will be possible to better assess masked hypertension, nocturnal hypertension, and the severity and variability of BP. In this review, we discuss the progression in the field, particularly in the last 5 years, ending with sensor-based approaches that incorporate machine learning algorithms to personalized medicine.