[A new method of pulmonary artery cannulation with minimally invasive decannulation for right ventricular assistance:an animal experiment].
OBJECTIVE
To create a new method of pulmonary artery cannulation during operation for right ventricular assistance, for which minimally invasive decannulation can be done after operation.


METHODS
A specially-made disassemblable composite graft consisting of a woven dacron tube and a bovine pericardial tube (composite graft) was anastomosed to the pulmonary artery as a pathway in seven dogs by median sternotomy. The end of the woven dacron tube and a link-thread for connecting the two tubes in the composite graft were drawn outside the body through an intercostal tunnel. A predisposed drawing-tieing thread in the composite graft was drawn outside through another intercostal tunnel and then tightened. An inflow cannula was placed into the left femoral vein or jugular vein via an incision of skin so as to establish a right ventricular assist system. By means of the centrifugal pump, the right ventricular bypass was established. After stopping the pumping, the 2 sets of predisposed prolene thread in the composite graft were tied by catheter and knotting tool via the small skin incision, 8 knots for each set, to close the bovine pericardial tube, and then the drawing-tieing thread, link-thread, and the dacron tube in the composite graft were removed. Median sternotomy was performed again to observe the anastomotic stoma, the closure of the stump of bovine pericardial tube, and whether hemorrhage occurred.


RESULTS
The mean maximum output of right ventricular assist system from left femoral or jugular vein to pulmonary artery was (64.4 +/- 12.3) ml.min(-1).kg(-1). The second sternotomy showed satisfactory knotting on the bovine pericardial tube except in one case, whose second set of drawing-tieing thread was tied in the seventh knot and failed to be drawn out, thus partially remained in the body. No bleeding was found in all cases.


CONCLUSIONS
The new cannulating methods with minimally invasive decannulation after operation created in this study is simple, easy and effective.
Tang
Yue
Y
Department of Surgery, Cardiovascular Institute and Fuwai Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100037, China.
Zhu
Xiao-dong
XD
Xu
Jian-long
JL
Chen
Dong-sheng
DS
Li
Gui-fen
GF
D000818:Animals; D002404:Catheterization / Q000379:methods*; D002417:Cattle; D004285:Dogs; D005260:Female; D006353:Heart-Assist Devices; D008297:Male; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D023421:Models, Animal; D011651:Pulmonary Artery / Q000601:surgery*; D015203:Reproducibility of Results; D018497:Ventricular Dysfunction, Right / Q000601:surgery*