Key result
A cuff-less watch-like optical sensor estimated 24-hour ambulatory systolic blood pressure with a mean difference of -1.8 mmHg compared to a conventional cuff-based device.
Why the study?
Cuff-based 24-h ambulatory blood pressure monitoring can cause discomfort, especially at night, potentially yielding non-representative blood pressure values.
Does a cuff-less watch-like optical sensor accurately estimate 24-h ambulatory blood pressure compared to a conventional cuff-based device in subjects undergoing ABPM?
Observational (n=67)
No
Does a cuff-less watch-like optical sensor accurately estimate 24-h ambulatory blood pressure compared to a conventional cuff-based device in subjects undergoing ABPM?
Mean Difference: -1.8 (95% CI -13.9–10.3)
Absolute Event Rate: 122.2% vs 124%
p-value: p=<0.05
A cuff-less watch-like optical sensor demonstrated acceptable accuracy and precision for 24-hour ambulatory blood pressure monitoring compared to a standard cuff-based device.
The use of 24-h ambulatory blood pressure monitoring (ABPM) has been continuously increasing over the last decades. However, cuff-based devices may cause discomfort, particularly at night, leading to potentially non-representative blood pressure (BP) values. We investigated the feasibility of a cuff-less BP monitoring solution in 67 subjects undergoing conventional 24-h ABPM. A watch-like optical sensor was attached at the upper arm or wrist at the contralateral side of the cuff. Systolic (SBP) and diastolic BP (DBP) values were estimated from the measured optical signals by pulse wave analysis. Average 24-h, daytime and nighttime BP values were compared between the conventional monitor and the cuff-less sensor. The differences between both methods-expressed as mean ± standard deviation (95% limits of agreement)-were of - 1.8 ± 6.2 mmHg (- 13.9, 10.3) on SBP and - 2.3 ± 5.4 mmHg (- 13.0, 8.3) on DBP for 24-h averages, of - 1.5 ± 6.6 mmHg (- 14.4, 11.4) on SBP and - 1.8 ± 5.9 mmHg (- 13.4, 9.9) on DBP for daytime averages, and of 0.4 ± 7.5 mmHg (- 14.4, 15.1) on SBP and - 1.3 ± 6.8 mmHg (- 14.7, 12.0) on DBP for nighttime averages. These results encouragingly suggest that cuff-less 24-h ABPM may soon become a clinical possibility.
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Proença et al. (2023) conducted an observational in Arterial hypertension (n=67). Cuff-less watch-like optical sensor (PulseWatch) vs. Conventional oscillometric brachial cuff was evaluated on 24-hour average systolic blood pressure (MD -1.8 mmHg, 95% CI -13.9 to 10.3, p=<0.05). A cuff-less watch-like optical sensor estimated 24-hour ambulatory systolic blood pressure with a mean difference of -1.8 mmHg compared to a conventional cuff-based device.
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