What technology do cuffless monitoring solutions often use besides ultrasound to estimate blood pressure?
Answer
Photoplethysmography (PPG)
Cuffless monitoring solutions, often integrated directly into advanced fitness trackers or smartwatches, employ various non-pressure-based sensing principles to estimate blood pressure continuously. One of the key optical sensors mentioned for this purpose is photoplethysmography, commonly referred to as PPG. This technology assesses blood flow dynamics indirectly, typically by analyzing pulse wave velocity or by tracking minute changes in vessel diameter detected through light absorption or reflection on the skin surface. While these methods offer unparalleled convenience, they require careful calibration against a traditional cuff device to ensure their readings maintain adequate clinical accuracy over time.
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