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Diagnostic accuracy of a home blood pressure monitor to detect atrial fibrillation


Atrial fibrillation (AF) is the most common sustained arrhythmia and is associated with an increased long-term risk of stroke. A screening test for early diagnosis has the potential to prevent AF-related strokes. This study assessed the diagnostic accuracy of an automated device for self-home blood pressure (BP) monitoring, which implements an algorithm for AF detection. A modified, automated oscillometric device for self-home BP monitoring (Microlife BPA100 Plus, Microlife, Heerbrugg, Switzerland) with an AF detector was used to carry out triplicate BP measurements in subjects with sinus rhythm, AF and non-AF arrhythmias. During each BP measurement, the electrocardiogram (ECG) was recorded simultaneously. A total of 217 simultaneous BP measurements and ECG recordings were obtained from 73 subjects. Twenty-seven subjects (37%) had AF, 23 (31%) non-AF arrhythmias and 23 (31%) had sinus rhythm. A single measurement had 93% sensitivity and 89% specificity for detecting AF. For two measurements, in which one of them was required to detect AF, the sensitivity was 100% and specificity 76%, whereas for three measurements, in which two of them were required to detect AF, the sensitivity was 100% and specificity 89% (κ=0.86 for an agreement with ECG). Using the latter approach, there were five false positive cases all having irregularities in 50% of the heartbeats. In patients with tachyarrhythmia, the device underestimated heart rate. These data suggest that an electronic device for self-home BP monitoring, which implements an algorithm for AF diagnosis has an excellent diagnostic accuracy and might, therefore, be used as a reliable screening test for the early diagnosis.

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This study was funded by the Hypertension Center, Third University Department of Medicine, Athens.

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Correspondence to G S Stergiou.

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The Hypertension Center has received grants from the manufacturer of the tested device (Microlife) for other research activities. GSS was a consultant to Microlife for the design of other blood pressure monitors. Microlife was not involved in the esign of this study.

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Stergiou, G., Karpettas, N., Protogerou, A. et al. Diagnostic accuracy of a home blood pressure monitor to detect atrial fibrillation. J Hum Hypertens 23, 654–658 (2009).

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  • atrial fiblillation
  • diagnosis
  • screening
  • blood pressure measurement
  • self-home monitoring

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