Blood pressure altering method affects correlation with pulse arrival time. Issue 2 (1st December 2021)

• Record Type: Journal Article
• Authors: Heimark, Sondre; Rindal, Ole Marius H.; Seeberg, Trine M.; Stepanov, Alexey; Boysen, Elin S.; Bøtker-Rasmussen, Kasper G.; Mobæk, Nina K.; Søraas, Camilla L.; Stenehjem, Aud E.; Fadl Elmula, Fadl Elmula M.; Waldum-Grevbo, Bård
• Is Part Of: Blood pressure monitoring. Volume 27:Issue 2(2022)
• Page Start: 139
• Page End: 146
• Publication Date: 2021-12-01
• Subjects: blood pressure monitoring -- pulse wave analysis -- wearable electronic devices; Blood pressure -- Measurement -- Periodicals; Blood Pressure Determination -- Periodicals; Blood Pressure Monitoring, Ambulatory -- Periodicals; Blood Pressure Monitors -- Periodicals; Hypertension -- Periodicals; 612.140287
• DOI: 10.1097/MBP.0000000000000577
• Languages: English
• ISSNs: 1359-5237

Abstract

Abstract : Objective: Pulse arrival time (PAT) is a potential main feature in cuff-less blood pressure (BP) monitoring. However, the precise relationship between BP parameters and PAT under varying conditions lacks a complete understanding. We hypothesize that simple test protocols fail to demonstrate the complex relationship between PAT and both SBP and DBP. Therefore, this study aimed to investigate the correlation between PAT and BP during two exercise modalities with differing BP responses using an unobtrusive wearable device. Methods: Seventy-five subjects, of which 43.7% had a prior diagnosis of hypertension, participated in an isometric and dynamic exercise test also including seated periods of rest prior to, in between and after. PAT was measured using a prototype wearable chest belt with a one-channel electrocardiogram and a photo-plethysmography sensor. Reference BP was measured auscultatory. Results: Mean individual correlation between PAT and SBP was −0.82 ± 0.14 in the full protocol, −0.79 ± 0.27 during isometric exercise and −0.77 ± 0.19 during dynamic exercise. Corresponding correlation between PAT and DBP was 0.25 ± 0.35, −0.74 ± 0.23 and 0.39 ± 0.41. Conclusion: The results confirm PAT as a potential main feature to track changes in SBP. The relationship between DBP and PAT varied between exercise modalities, with the sign of the correlation changing from negative to positive between type of exercise modality. Thus, we hypothesize that simple test protocols fail to demonstrate the complex relationship between PAT and BP with emphasis on DBP.