CCS Edmonton 2009 PDF Print E-mail
Written by mmur   
Sunday, 19 July 2009 12:21
THE SENSITIVITY, SPECIFICITY AND ACCURACY OF THE BpTRU VERSUS 24 HOUR AMBULATORY BLOOD PRESSURE MONITORING


Author Block: D Armstrong, A Thakrar, D Brouillard, M Matangi
Kingston, Ontario

Abstract:
PURPOSE: To determine the sensitivity, specificity, negative predictive value (NPV), positive predictive value (PPV) and accuracy of the BpTRU electronic blood pressure (BP) measuring device when compared to average daytime 24hr ambulatory blood pressure (ABPM) measurements.
METHODS: 420 consecutive patients (P) referred for 24hr ABPM also had their BpTRU measurements recorded. The value of ≤135/85 was used as normal for both methods. The BpTRU measurements were recorded the same morning the ABPM was applied. Our BpTRU devices were 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. Calculations were made for both systolic blood pressure (SBP) and diastolic blood pressure (DBP).
RESULTS: See table 1.
CONCLUSIONS: The sensitivity, specificity and accuracy of the BpTRU electronic BP measuring device when compared to average daytime 24hr ABPM is clinically unacceptable for both systolic and diastolic measurements. This device must not supplant 24hr ABPM as has been advocated by some.
Table 1.
SYSTOLIC BPDaytime ABPM SBP >135Daytime ABPM SBP <136N 
BpTRU SBP >13518944233PPV =81.1%
BpTRU SBP <13675112187NPV =59.9%
SYSTOLIC BPSensitivity =71.6%Specificity =71.8%420Accuracy =71.6%
     
DIASTOLIC BPDaytime ABPM DBP >85Daytime ABPM DBP <86N 
BpTRU DBP >8510862170PPV =63.5%
BpTRU DBP <8636214250NPV =85.6
DIASTOLIC BPSensitivity =75.0%Specificity =77.5%420Accuracy =76.7%

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Author Disclosure Information:  D. Armstrong, None; A. Thakrar, None; D. Brouillard, None; M. Matangi, None.
Last Updated on Sunday, 19 July 2009 12:22