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Vascular function in continuous-flow left ventricular assist device recipients: effect of a single pulsatility treatment session
- Source :
- Am J Physiol Regul Integr Comp Physiol
- Publication Year :
- 2021
- Publisher :
- American Physiological Society, 2021.
-
Abstract
- Vascular function is further attenuated in patients with chronic heart failure implanted with a continuous-flow left ventricular assist device (LVAD), likely due to decreased arterial pulsatility, and this may contribute to LVAD-associated cardiovascular complications. However, the impact of increasing pulsatility on vascular function in this population is unknown. Therefore, 15 LVAD recipients and 15 well-matched controls underwent a 45-min, unilateral, arm pulsatility treatment, evoked by intermittent cuff inflation/deflation (2-s duty cycle), distal to the elbow. Vascular function was assessed by percent brachial artery flow-mediated dilation (%FMD) and reactive hyperemia (RH) (Doppler ultrasound). Pretreatment, %FMD (LVAD: 4.0 ± 1.7; controls: 4.2 ± 1.4%) and RH (LVAD: 340 ± 101; controls: 308 ± 94 mL) were not different between LVAD recipients and controls; however, %FMD/shear rate was attenuated (LVAD: 0.10 ± 0.04; controls: 0.17 ± 0.06%/s−1, P < 0.05). The LVAD recipients exhibited a significantly attenuated pulsatility index (PI) compared with controls prior to treatment (LVAD: 2 ± 2; controls: 15 ± 7 AU, P < 0.05); however, during the treatment, PI was no longer different (LVAD: 37 ± 38; controls: 36 ± 14 AU). Although time to peak dilation and RH were not altered by the pulsatility treatment, %FMD (LVAD: 7.0 ± 1.8; controls: 7.4 ± 2.6%) and %FMD/shear rate (LVAD: 0.19 ± 0.07; controls: 0.33 ± 0.15%/s−1) increased significantly in both groups, with, importantly, %FMD/shear rate in the LVAD recipients being restored to that of the controls pretreatment. This study documents that a localized pulsatility treatment in LVAD recipients and controls can recover local vascular function, an important precursor to the development of approaches to increase systemic pulsatility and reduce systemic vascular complications in LVAD recipients.
- Subjects :
- Male
medicine.medical_specialty
Physiology
medicine.medical_treatment
Flow mediated dilation
030204 cardiovascular system & hematology
Pulsatility index
Prosthesis Design
Ventricular Function, Left
Prosthesis Implantation
Upper Extremity
03 medical and health sciences
0302 clinical medicine
Physiology (medical)
Internal medicine
Medicine
Humans
In patient
030212 general & internal medicine
Session (computer science)
Aged
Heart Failure
Cross-Over Studies
business.industry
Continuous flow
Recovery of Function
Middle Aged
medicine.disease
equipment and supplies
Treatment Outcome
Regional Blood Flow
Ventricular assist device
Heart failure
Case-Control Studies
Pulsatile Flow
Cardiology
Heart-Assist Devices
Therapeutic Occlusion
business
Vascular function
Research Article
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Am J Physiol Regul Integr Comp Physiol
- Accession number :
- edsair.doi.dedup.....1e62018438f8c3fc1f038151ddfb495b