Faculty Collaboration Database

Effect of continuous and pulsatile flow left ventricular assist on pulsatility in a pediatric animal model of left ventricular dysfunction: pilot observations. ASAIO J 2007;53(3):385-91

Date

05/23/2007

Pubmed ID

17515734

DOI

10.1097/MAT.0b013e318050d210

Scopus ID

2-s2.0-34249014596 (requires institutional sign-in at Scopus site)   22 Citations

Abstract

Pediatric ventricular assist devices are being developed that can produce pulsatile flow (PF) or continuous flow (CF). An important aspect of choosing between these two modes is understanding the consequences of each mode on pediatric vascular pulsatility. Differences in vascular pulsatility generated by PF and CF operation of the 3-inch pediatric cardiopulmonary assist system (pCAS, Ension, Inc., Pittsburgh, PA) were investigated while providing left atrium-to-aorta left ventricular assist (LVA), using an infant animal model of left ventricular dysfunction. Hemodynamic data were digitally recorded with the pCAS providing LVA at incremental flow rates while operating in continuous mode, pulsatile mode at 100 bpm, and pulsatile mode at 140 bpm. These data were used to calculate vascular input impedance (Zart), energy equivalent pressure, and surplus hemodynamic energy as indices of pulsatility for partial (50% of maximum) and maximum LVA flow. Both CF and PF LVA by the pCAS resulted in favorable hemodynamic rectification of left ventricular dysfunction while generating equivalent flows. PF LVA maintained a greater degree of pulsatility compared with CF, as evidenced by increasing energy equivalent pressure and a lesser drop in surplus hemodynamic energy with increasing pCAS flow. Differences in Zart modulus and phase were indiscernible. The selection of flow mode may have long-term consequences on Zart and end-organ perfusion affecting clinical outcomes in pediatric patients.

Author List

Pantalos GM, Giridharan G, Colyer J, Mitchell M, Speakman J, Lucci C, Johnson G, Gartner M, Koenig SC

Author

Michael Edward Mitchell MD Chief, Professor in the Surgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Aorta, Thoracic
Blood Pressure Monitors
Disease Models, Animal
Heart Atria
Heart-Assist Devices
Humans
Infant
Models, Cardiovascular
Pilot Projects
Pulsatile Flow
Swine
Transducers
Vascular Resistance
Ventricular Dysfunction, Left