Intrathoracic implantation of a continuous flow left ventricular assist device--the microdiagonal blood pump.
OBJECTIVE
All existing ventricular assist devices are associated with a considerable number of serious complications. We report on our first animal tests with a newly developed microdiagonal blood pump (MDP).


METHODS
Six female calves underwent MDP implantation. The inflow and outflow conduit were anastomosed to the left atrium and the descending aorta. The MDP was placed in the left phrenicocostal sinus. Pump flow was adjusted to 2-3 L/min. Hemodynamic and echocardiographic data as well as blood samples were measured over the test period of 7 days. Thereafter, all internal organs and the pump were explanted for thorough examination.


RESULTS
Mean arterial (90.5+/-12.1102.7+/-8.7 mmHg) and mean pulmonary arterial (17.3+/-2.420.6+/-2.7 mmHg) pressures remained stable during the test period. Cardiac output (5.4+/-0.5 = or >3.5+/-0.5 L/min) decreased postoperatively due to partial unloading of the heart. Left ventricular end-diastolic (4.4+/-0.5= or >3.8+/-0.4 cm) and end-systolic (3.4+/-0.5 =or >2.9+/-0.4 cm) diameters decreased after MDP implantation and did not change during the test period. Mean number of platelets (550+/-57 =or >350+/-86 x 103/microL) and hemoglobin (13.2+/-1.3 = or >11.9+/-0.8 g/dL) decreased perioperatively due to surgical reasons and recovered in the postoperative course. Free hemoglobin was slightly enhanced in the postoperative course.


CONCLUSIONS
Our results demonstrate that the MDP is suitable for intrathoracic implantation and provides a reliable left ventricular unloading.
Christiansen
S
S
Department of Cardiothoracic Surgery, University of Aachen, Aachen, Germany. schristiansen@ukaachen.de
Redmann
K
K
Autschbach
R
R
D000818:Animals; D015415:Biomarkers / Q000097:blood; D001783:Blood Flow Velocity; D002417:Cattle; D004195:Disease Models, Animal; D004452:Echocardiography; D004867:Equipment Design; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D006353:Heart-Assist Devices / Q000009:adverse effects; D010493:Pericarditis / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D011184:Postoperative Period; D011300:Preoperative Care; D011669:Pulmonary Wedge Pressure; D013318:Stroke Volume; D019616:Thoracic Surgical Procedures / Q000009:adverse effects / Q000295:instrumentation*; D016896:Treatment Outcome
D015415:Biomarkers