Journal
CIRCULATION-HEART FAILURE
Volume 6, Issue 5, Pages 1005-1012Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCHEARTFAILURE.112.000186
Keywords
blood pressure measurement; monitoring; heart-assist devices; heart failure; Terumo Elemano
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Funding
- Thoratec Corporation
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Background Doppler ultrasound is the clinical gold standard for noninvasive blood pressure (BP) measurement among continuous-flow left ventricular assist device patients. The relationship of Doppler BP to systolic BP (SBP) and mean arterial pressure (MAP) is uncertain and Doppler measurements require a clinic visit. We studied the relationship between Doppler BP and both arterial-line (A-line) SBP and MAP. Validity and reliability of the Terumo Elemano BP Monitor, a novel slow cuff-deflation device that could potentially be used by patients at home, were assessed. Methods and Results Doppler and Terumo BP measurements were made in triplicate among 60 axial continuous-flow left ventricular assist device (HeartMate II) patients (30 inpatients and 30 outpatients) at 2 separate exams (360 possible measurements). A-line measures were also obtained among inpatients. Mean absolute differences (MADs) and correlations were used to determine within-device reliability (comparison of second and third BP measures) and between-device validity. Bland-Altman plots assessed BP agreement between A-line, Doppler BP, and Terumo Elemano. Success rates for Doppler and Terumo Elemano were 100% and 91%. Terumo Elemano MAD for repeat SBP and MAP were 4.60.6 and 4.2 +/- 0.6 mm Hg; repeat Doppler BP MAD was 2.9 +/- 0.2 mm Hg. Mean Doppler BP was lower than A-line SBP by 4.1 (MAD=6.4 +/- 1.4) mm Hg and higher than MAP by 9.5 (MAD=11.0 +/- 1.2) mm Hg; Terumo Elemano underestimated A-line SBP by 0.3 (MAD=5.6 +/- 0.9) mm Hg and MAP by 1.7 (MAD=6.0 +/- 1.0) mm Hg. Conclusions Doppler BP more closely approximates SBP than MAP. Terumo Elemano was successful, reliable, and valid when compared with A-line and Doppler.
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