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Ann Thorac Surg 2004;78:1460-1462
© 2004 The Society of Thoracic Surgeons
a King's College Hospital, Denmark Hill, London, United Kingdom
Accepted for publication July 10, 2003.
* Address reprint requests to Dr Carr, Department of Cardiothoracic Surgery, King's College Hospital, London SE5 9RS, UK
noahalkh{at}talk21.com
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| Introduction |
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We discuss a patient with cirrhosis and hepatocellular carcinoma who was suitable for OPCAB surgery where avoiding cardiopulmonary bypass may have reduced the risk of potentially fatal liver decompensation. We also describe the operative maneuvers to minimize the risk of postoperative bleeding.
A 56-year-old man was admitted with unstable angina, with a history of two previous myocardial infarctions. He was an insulin-dependent diabetic with cirrhosis secondary to alcohol abuse and had several esophageal variceal bleeds in the past. Cardiac catheter demonstrated severe triple vessel disease with a blocked left anterior descending artery (LAD), tight ostial circumflex, ostial diagonal, and proximal right coronary artery stenoses. Echocardiogram illustrated well preserved left ventricular function.
Preoperative workup had revealed deranged liver function tests (Table 1) and a reduced platelet count (50 x 109/L). Ultrasound and computerized tomography (CT) of the liver illustrated two contrast enhancing masses in a cirrhotic liver: a 2.5-cm lesion in segment 4 with a central scar and a 1-cm lesion in segment 6. Hepatitis serology was negative and
-fetoprotein was not elevated. He had cirrhosis diagnosed 12 years previously (by biopsy) and his last variceal bleed was 4 years ago.
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His reduced platelet count had previously been diagnosed as secondary to his chronic liver disease. He was transfused 2 pools of platelets immediately preoperatively and depending on the repeat full blood count during surgery, further transfusion would be titrated.
Following median sternotomy bilateral skeletonized internal thoracic arteries were harvested leaving the pleurae intact on both sides in order to minimize blood loss postoperatively, due to the reduced platelet count and decreased clotting product production (intraoperative platelet count 64 x 109/L). Long saphenous vein was harvested from the leg using a minimally invasive "stripper" technique.
Following half-dose heparin OPCAB surgery was performed using the Octopus 3 (Medtronic Inc, Minneapolis, MN) stabilizer and intracoronary shunts (Flo-thru; Biovascular Inc, St Paul, MN). The left internal thoracic artery was anastomosed to the LAD, the right internal thoracic artery was anastomosed to the first diagonal artery, and lengths of saphenous vein were anastomosed to the distal circumflex and right coronary arteries. There was some hemodynamic instability during the circumflex graft; if this graft had not been feasible a hybrid procedure would have been performed with percutaneous coronary angioplasty following the surgery. Following the construction of the proximal anastomoses Tisseel glue (Baxter AG, Vienna, Austria) was sprayed using the Duploject System (Immuno AG, Vienna, Austria) on both internal thoracic artery harvest beds and on all anastomoses, to further aid control of bleeding. It is not our normal policy to use hemostatic aids. The heparin was reversed and a further 2 pools of platelets administered. The patient was extubated at 3 hours postoperatively and the total drainage from the mediastinal drains was 425 mLs in 48 hours, no further platelet or blood transfusions were required.
Postoperatively his management was undertaken in close communication with the hepatologists and, apart from a minor chest infection, he made a smooth recovery with no evidence of hepatic decompensation. The patient was discharged home on the eighth postoperative day, and his liver transplant was performed 2-months later, from which he made a good recovery.
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Progressive hepatic dysfunction is one of the most severe postoperative complications in the cirrhotic patient, and it is probably important to maintain stable and sufficient hepatic blood flow in the perioperative period to avoid further damage [4]. The use of cardiopulmonary bypass may not provide sufficient blood flow to the already compromised liver and by performing CABG surgery off-pump a more normal blood pressure and perfusion may reduce the risk of decompensation. A redo-CABG in a cirrhotic patient performed through a left thoracotomy without extracorporeal circulatory support has been described [5], but this involved a saphenous vein graft to the LAD and anastomosis to the descending thoracic aorta.
The presence of severe coronary artery disease in a patient who requires liver transplantation should not be considered as a contraindication to transplant, and with the advent of OPCAB and its future refinements the need for simultaneous CABG and OLT may not be necessary.
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