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Ann Thorac Surg 2001;72:899-904
© 2001 The Society of Thoracic Surgeons
a Department of Surgery, The University of Texas Medical Branch, Galveston, Texas, USA
b Department of Anesthesiology, The University of Texas Medical Branch, Galveston, Texas, USA
c MC3 Corporation, Ann Arbor, Michigan, USA
Address reprint requests to Dr Lick, Department of Cardiothoracic Surgery, University of Texas Medical Branch, 301 University Blvd, Route 0528, Galveston, TX 77555-0528
e-mail: slick{at}utmb.edu
Presented at the Poster Session of the Thirty-seventh Annual Meeting of The Society of Thoracic Surgeons, New Orleans, LA, Jan 29–31, 2001.
Background. We previously reported a 50% incidence of immediate right heart failure using a rigidly housed, noncompliant inflow artificial lung in series with the pulmonary circulation in a healthy ovine survival model. Three device modifications resulted: (1) an inflow cannula compliance chamber, (2) an inlet blood flow separator, and (3) modification of the artificial lung outlet geometry, all to reduce resistance and mimic the compliance of the pulmonary vascular bed.
Methods. In 7 sheep, arterial grafts were anastomosed end-to-side to the proximal and distal main pulmonary artery, with the paracorporeal artificial lung interposed. A pulmonary artery snare between anastomoses diverted full pulmonary blood flow through the artificial lung for up to 72 hours.
Results. Six of 7 sheep exhibited good cardiac function throughout the test period: mean central venous pressure was 6.8 mm Hg (range, 4 to 11 mm Hg), mean cardiac output, 4.17 ± 0.12 L/min (range, 2.4 to 6.3 L/min); before and after device mean pulmonary arterial pressure, 21.8 and 18.5 mm Hg, and left atrial pressure, 10.8 mm Hg.
Conclusions. This modified artificial lung prototype with an inflow compliance chamber, blood flow separator, and modified outlet geometry has greatly improved cardiac function and initial survival in our healthy ovine model.
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