An Unfinished but Necessary Path: Ring-Based Cuffless Blood Pressure Monitoring at the Crossroads of Innovation and Clinical Reality

Background Cuffless wearable technologies for blood pressure monitoring have emerged as a promising alternative to conventional cuff-based methods, offering the possibility of continuous, real-world assessment. Summary Ring-based devices estimate blood pressure from peripheral signals, including photoplethysmography and pulse wave features. Although early studies have shown encouraging correlations with reference standards, these systems do not directly measure arterial pressure. Their performance is affected by physiological variability, calibration dependence, and population heterogeneity. Current evidence suggests that these devices may provide useful information about blood pressure dynamics, but their accuracy and reliability remain insufficient for routine clinical decision-making. Key Messages Cuffless blood pressure monitoring represents an important technological advance, but it remains constrained by fundamental methodological challenges. Broader validation in diverse populations and outcome-based clinical trials are needed before widespread clinical adoption.