Analysis of Pressure Head-Flow Loops of Pulsatile Rotodynamic Blood Pumps

Jahren, Silje Ekroll; Ochsner, Gregor; Shu, Fangjun; Amacher, Raffael; Antaki, James F.; Vandenberghe, Stijn (2014). Analysis of Pressure Head-Flow Loops of Pulsatile Rotodynamic Blood Pumps. Artificial organs, 38(4), pp. 316-326. Wiley-Blackwell 10.1111/aor.12139

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The clinical importance of pulsatility is a recurring topic of debate in mechanical circulatory support. Lack of pulsatility has been identified as a possible factor responsible for adverse events and has also demonstrated a role in myocardial perfusion and cardiac recovery. A commonly used method for restoring pulsatility with rotodynamic blood pumps (RBPs) is to modulate the speed profile, synchronized to the cardiac cycle. This introduces additional parameters that influence the (un)loading of the heart, including the timing (phase shift) between the native cardiac cycle and the pump pulses, and the amplitude of speed modulation. In this study, the impact of these parameters upon the heart-RBP interaction was examined in terms of the pressure head-flow (HQ) diagram. The measurements were conducted using a rotodynamic Deltastream DP2 pump in a validated hybrid mock circulation with baroreflex function. The pump was operated with a sinusoidal speed profile, synchronized to the native cardiac cycle. The simulated ventriculo-aortic cannulation showed that the level of (un)loading and the shape of the HQ loops strongly depend on the phase shift. The HQ loops displayed characteristic shapes depending on the phase shift. Increased contribution of native contraction (increased ventricular stroke work [WS ]) resulted in a broadening of the loops. It was found that the previously described linear relationship between WS and the area of the HQ loop for constant pump speeds becomes a family of linear relationships, whose slope depends on the phase shift.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Cardiovascular Engineering (CVE)

UniBE Contributor:

Jahren, Silje Ekroll and Vandenberghe, Stijn

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0160-564X

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Francesco Clavica

Date Deposited:

09 Apr 2014 21:48

Last Modified:

02 Nov 2015 09:51

Publisher DOI:

10.1111/aor.12139

PubMed ID:

23889536

Uncontrolled Keywords:

Rotodynamic blood pumps, Pulsatility, Pressure head-flow loops, Left ventricular assist device, In vitro study, Hybrid mock circulation, Continuous flow

BORIS DOI:

10.7892/boris.48118

URI:

https://boris.unibe.ch/id/eprint/48118

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