A COMPARISON OF THE BpTRU ELECTRONIC BLOOD PRESSURE MEASURING DEVICE WITH DAYTIME 24HR AMBULATORY BLOOD PRESSURE RECORDINGS IN AN OUTPATIENT CLINICAL PRACTICE Author Block: A Thakrar, D Armstrong, D Brouillard, M MatangiKingston, Ontario Abstract:PURPOSE: To compare the average BpTRU electronic blood pressure (BP) measurements with the average daytime BP measurements using 24hr ambulatory blood pressure monitoring (ABPM).METHODS: 420 consecutivepatients (P) referred for 24hr ABPM also had their BpTRU measurements recorded. The BpTRU measurements were recorded the same morning the ABPM was applied. Our BpTRU devices are set to measure 6 BP recordings every 2 minutes. The BpTRU automatically discards the first reading and averages the last 5. Our ABPM monitors record daytime BP from 7am to 10pm every half hour. A paired Student’s t test was used to determine differences between mean systolic blood pressure (SBP) and diastolic blood pressure (DBP). Bivariate simple linear regression analysis was used to calculate the correlation coefficient using a fit Y by X scatterplot. A P value of <0.05 was considered statistically significant.RESULTS: See table 1.CONCLUSIONS: There was no statistically significant difference in the mean SBP between the two methods. There is a small (2.6mmHg), but statistically significant difference in DBP. Basedon this data the normal value for SBP using the BpTRU device should be the same as the accepted normal for average daytime 24hr ABPM, specifically ≤135mmHg. The BpTRU DBP is approximately 3mmHg higher than the 24hr ABPM and implies the normal DBP for this device should be ≤88mmHg. Table 1. . N SBP DBP BpTRU 420 140.4 +/-19.8 83.1 +/-11.2 24hr ABPM 420 139.3 +/-13.4 80.7 +/-10.6 P value =0.13 <0.0001 r value 0.69 0.71 P value <0.0001 <0.0001 :Author Disclosure Information: A. Thakrar, None; D. Armstrong, None; D. Brouillard, None; M. Matangi, None.