title: Evaluation of the overall system precision of the Welch-Allyn transtelephonic home blood pressure monitor in adults with Parkinson's disease.
abstract: BACKGROUND
  Non-invasive blood pressure (BP) devices should be independently evaluated before being used in special populations. The objective of this study was to assess the accuracy of the Welch-Allyn transtelephonic home blood pressure monitor in adults with Parkinson's disease to evaluate the device for use in a large clinical trial involving the safety and efficacy of a monoamine oxidase inhibitor.
  
  
  METHODS
  BP measurements taken with the device were compared with the results obtained by two experienced observers using a mercury sphygmomanometer in patients with Parkinson's disease. The limits of agreement were then calculated for the device and compared with the results of the two observers.
  
  
  RESULTS
  The agreement parameters between the two observers were -0.5 +/- 2.6 mmHg for systolic BP and 0.1 +/- 2.2 mmHg for diastolic BP. The agreement between the Welch-Allyn transtelephonic device and the observers was -2.6 +/- 4.5 mmHg and -1.9 +/- 3.2 mmHg for systolic and diastolic BP respectively. Nearly 90% of the readings were within 10 mmHg of the observers for both systolic and diastolic BP. Mild tremor had a moderate effect on the validity of the device.
  
  
  CONCLUSIONS
  The Welch-Allyn transtelephonic device demonstrated acceptable precision in this cohort of patients with Parkinson's disease and is considered valid for use in a clinical trial involving these patients.
authors.affiliation: Section of Hypertension and Clinical Pharmacology, University of Connecticut School of Medicine, Farmington, 06030-3940, USA.
authors.forename: Timothy
authors.initials: T
authors.lastname: Herbst
authors.forename: Yusra
authors.initials: Y
authors.lastname: Anis-Anwar
authors.forename: Sharon
authors.initials: S
authors.lastname: Giacco
authors.forename: William B
authors.initials: WB
authors.lastname: White
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D015588:Observer Variation; D009991:Oscillometry; D010300:Parkinson Disease / Q000503:physiopathology*; D015203:Reproducibility of Results; D013685:Telecommunications / Q000295:instrumentation