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Effect of increasing pump speed during exercise on peak oxygen uptake in heart failure patients supported with a continuous-flow left ventricular assist device. A double-blind randomized study.

Publication ,  Journal Article
Jung, MH; Hansen, PB; Sander, K; Olsen, PS; Rossing, K; Boesgaard, S; Russell, SD; Gustafsson, F
Published in: Eur J Heart Fail
April 2014

AIMS: Continuous-flow left ventricular assist device (CF-LVAD) implantation is associated with improved quality of life, but the effect on exercise capacity is less well documented. It is uncertain whether a fixed CF-LVAD pump speed, which allows for sufficient circulatory support at rest, remains adequate during exercise. The aim of this study was to evaluate the effects of fixed versus incremental pump speed on peak oxygen uptake (peak VO2) during a maximal exercise test. METHODS AND RESULTS: In CF-LVAD (HeartMate II) patients exercise testing measuring peak oxygen uptake (VO2) was performed on an ergometer bike twice in one day: once with fixed pump speed (testfix) and once with incremental pump speed (testinc). The order of testfix and testinc in each patient was determined by randomization. During testinc pump speed was increased from the baseline value by 400 rpm/2 min. Fourteen patients (aged 23–69 years) were included with a mean support duration of 465±483 days. Baseline CF-LVAD speed was 9357±238 rpm and during testinc speed was increased by a mean of 1486±775 rpm. Mean peak VO2 was significantly higher in testinc compared with testfix (15.4±5.9 mL/kg/min vs. 14.1±6.3 mL/kg/min; P=0.012), corresponding to a 9.2% increase. All exercise tests (n=28) were adequately performed with RER>1. CONCLUSION: Increasing pump speed during exercise augments peak VO2 in patients supported with CF-LVADs. An automatic speed-change function in future generations of CF-LVADs might improve functional capacity.

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Published In

Eur J Heart Fail

DOI

EISSN

1879-0844

Publication Date

April 2014

Volume

16

Issue

4

Start / End Page

403 / 408

Location

England

Related Subject Headings

  • Young Adult
  • Oxygen Consumption
  • Oxygen
  • Middle Aged
  • Male
  • Humans
  • Heart-Assist Devices
  • Heart Ventricles
  • Heart Failure
  • Female
 

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Jung, M. H., Hansen, P. B., Sander, K., Olsen, P. S., Rossing, K., Boesgaard, S., … Gustafsson, F. (2014). Effect of increasing pump speed during exercise on peak oxygen uptake in heart failure patients supported with a continuous-flow left ventricular assist device. A double-blind randomized study. Eur J Heart Fail, 16(4), 403–408. https://doi.org/10.1002/ejhf.52
Jung, Mette Holme, Peter Bo Hansen, Kaare Sander, Peter Skov Olsen, Kasper Rossing, Soeren Boesgaard, Stuart D. Russell, and Finn Gustafsson. “Effect of increasing pump speed during exercise on peak oxygen uptake in heart failure patients supported with a continuous-flow left ventricular assist device. A double-blind randomized study.Eur J Heart Fail 16, no. 4 (April 2014): 403–8. https://doi.org/10.1002/ejhf.52.
Jung MH, Hansen PB, Sander K, Olsen PS, Rossing K, Boesgaard S, Russell SD, Gustafsson F. Effect of increasing pump speed during exercise on peak oxygen uptake in heart failure patients supported with a continuous-flow left ventricular assist device. A double-blind randomized study. Eur J Heart Fail. 2014 Apr;16(4):403–408.
Journal cover image

Published In

Eur J Heart Fail

DOI

EISSN

1879-0844

Publication Date

April 2014

Volume

16

Issue

4

Start / End Page

403 / 408

Location

England

Related Subject Headings

  • Young Adult
  • Oxygen Consumption
  • Oxygen
  • Middle Aged
  • Male
  • Humans
  • Heart-Assist Devices
  • Heart Ventricles
  • Heart Failure
  • Female