FIRST RESULTS OF THE COMPARISON OF A CUFFLESS 24 HOUR BLOOD PRESSURE MEASUREMENT DEVICE WITH A CUFF-BASED STANDARD DEVICE IN A REAL LIFE SETTING. (June 2018)

• Record Type: Journal Article
• Authors: Krisai, P.; Vischer, A.; Meienberg, A.; Mayr, M.; Burkard, T.
• Is Part Of: Journal of hypertension. Volume 36(2018)Supplement 1
• Publication Date: 2018-06
• Subjects: Hypertension -- Periodicals; Hypertension -- Periodicals; 616.132005
• DOI: 10.1097/01.hjh.0000539759.58515.45
• Languages: English
• ISSNs: 1473-5598

Abstract

Abstract : Objective: Recently, a cuffless blood pressure (BP) measurement device using the pulse-transit time (PTT) for beat-to-beat calculation of BP values initially calibrated to a single cuff-based measurement has been introduced and successfully validated over short term according to the ESH validation protocol. We evaluated this cuffless PTT device (TestBP) in a real-life setting compared to a validated, ambulatory, cuff-based standard BP device (RefBP) over 24 hours. Figure. No caption available. Design and method: Between May and December 2017, 71 individuals were prospectively enrolled and categorised into three groups according to mean day-time systolic BP (<135, 135–149, > = 150 mmHg). Main exclusion criteria were age < 25 years or a difference in blood pressure > 10 mmHg between both upper extremities. Cuffless (Somnotouch NIBP) and cuff-based, standard (Spacelabs 90217A) 24 h BP measurements were performed simultaneously on the left and right arm, respectively. The first cuff-based measurement was used as calibration measurement for the TestBP. We compared the systolic and diastolic mean 24h-BP values of the RefBP and TestBP. Results: Mean age was 49 (±15) years and 51% were male. Mean (±standard deviation) 24 h BP for the TestBP and RefBP were 140.8 (±20) vs 134.0 (±17.3) mmHg for systolic (p < 0.0001) and 85.8 (±14.1) vs 79.3 (±11.7) mmHg for diastolic (p < 0.0001) BP values, respectively. Mean absolute systolic and diastolic differences were 10.2 (±7.2) and 8.2 (±5.5) mmHg, respectively. Comparing agreement between the mean 24 h BP values of the TestBP and RefBP, absolute difference was within 5, 10 and 15 mmHg in 23 (31.5%), 43 (58.9%) and 54 (74%) for systolic and 25 (34.3%), 52 (71.2%) and 66 (90.4%) for diastolic measurements. The agreement for systolic mean 24 h BP measurements stratified by daytime BP-groups are shown in Table 1. Bland-Altman plots comparing mean systolic and diastolic 24h-BP values between the two devices are shown in Figure 1. Conclusions: In our study there was a significant difference between the TestBP and RefBP with an overestimation by the new cuffless PTT device. Best agreement for systolic BP was in the range of 135–149 mmHg. Reasons for this difference between the measurement techniques need to be investigated in further studies.