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Ann Thorac Surg 2004;77:311-312
© 2004 The Society of Thoracic Surgeons
a Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, Cleveland, Ohio, USA
Accepted for publication April 14, 2003.
* Address reprint requests to Dr Gillinov, Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, F24, 9500 Euclid Ave, Cleveland, OH 44195, USA
e-mail: gillinom{at}ccf.org
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| Introduction |
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A 43-year-old man with aortic stenosis had aortic valve replacement with a 25 mm St. Jude prosthesis. Seven months later, he presented with prosthetic valve endocarditis and aortic root abscess caused by Enterobacter aerogenes. Antibiotics were started, and he underwent aortic root replacement with an allograft. Two weeks later, he developed mediastinitis. This was treated by mediastinal debidement and mobilization of omental and pectoralis flaps to cover the allograft and close the incision. The patient had recurrent fever and malaise. An echocardiogram demonstrated endocarditis involving the allograft, and the patient was transferred to The Cleveland Clinic Foundation.
Upon arrival, the patient was lethargic but neurologically intact. Echocardiogram revealed a large aortic root abscess cavity and pseudoaneurysm with disruption of the proximal allograft suture line and severe periprosthetic aortic regurgitation. There was major disruption of the distal aortic suture line with a large jet of blood exiting the aorta and entering the same large pseudoaneurysm that occupied most of the pericardial space. The right ventricle was compressed by this blood, and right ventricular function was mildly depressed. The left ventricle was displaced laterally, but left ventricular function was normal.
We proceeded with an urgent operation. The left femoral artery and vein were exposed and cannulated with Heartport cannulas (21F arterial, 25F venous, Heartport, Redwood, CA). Under transesophageal echo guidance, a retrograde cardioplegia catheter was placed via the right internal jugular vein. Cardiopulmonary bypass was instituted and systemic cooling commenced. A balloon occlusion catheter was introduced via the femoral artery cannula and positioned at the level of the disrupted allograft-aortic anastomosis. When the heart fibrillated at a systemic temperature of 280C, the intra-aortic balloon was inflated directly over the distal aortic perforation in an attempt to seal the rupture (Fig 1). With some manipulation, we were able to achieve aortic occlusion, as assessed by reduced pressure at the balloon tip.
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The patient was neurologically intact and extubated the day after surgery. He received a permanent pacemaker, recovered rapidly, and was discharged on postoperative day 15. Blood cultures and intraoperative cultures were negative. Pathology revealed suppurative acute inflammation of the allograft and surrounding soft tissue with transmural necrosis. The patient was discharged to home with a 6-week course of intravenous antibiotics and continues to do well 18 months after surgery.
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An alternate strategy would have been to institute femoral bypass, cool and place a left ventricular vent via a small left thoracotomy to prevent ventricular distension. Using this strategy, once the patient is cooled sufficiently, the pump is shut off and the entire dissection completed under circulatory arrest. Because of dense adhesions, omental and pectoralis flaps, and severe inflammation, this would have necessitated a 30- to 40-minute period of hypothermic circulatory arrest in this case. In addition, it is likely that severe aortic regurgitation would have caused ventricular distension, even with a left ventricular vent in place.
Balloon occlusion was used to control an aortic disruption and facilitate myocardial protection in a complex and threatening reoperative setting. In this case, a reoperation with dense adhesions, balloon inflation did not cause further aortic damage; in other instances, particularly in a primary operation or aortic dissection, it is possible that the balloon might cause more aortic damage. Nevertheless, the strategy of balloon occlusion of aortic disruption is potentially lifesaving and should be considered in the management of difficult patients, particularly those with the combination of mediasinal pseudoaneurysm and aortic regurgitation [3].
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