Chest
Volume 93, Issue 1, January 1988, Pages 138-143
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Pseudoaneurysm of the Ascending Aorta following Cardiac Surgery

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Pseudoaneurysm of the ascending aorta is an unusual and potentially fatal complication of cardiovascular surgery. Most pseudoaneurysms are associated with aortic valve or coronary artery bypass graft surgery and are often mycotic in origin. Chest roentgenography and aortography have been the principle methods of diagnosis. Recently, contrast enhanced computed tomography (CT) has proven to be a useful means of diagnosis, providing a less invasive method of distinguishing pseudoaneurysm from other causes of fever and mediastinal widening in the postoperative cardiovascular patient. Thirty one cases of postoperative pseudoaneurysm of the ascending aorta occurring since 1963 are reviewed, including seven cases from our experience.

Section snippets

Material and Methods

Twenty-four cases of postoperative pseudoaneurysm of the ascending aorta published in English since 1963 were reviewed. Five additional cases were added from Thomas Jefferson University Hospital (TJUH) and two from the Medical College of Pennsylvania (MCP). The location of the pseudoaneurysm (Fig 1), the interval of time from the initial cardiac surgery to the diagnosis of pseudoaneurysm, the type of initial surgery performed, the organism found, if any, the outcome of surgery for aneurysm and

Case 1

A 55-year-old man developed a new diastolic murmur due to aortic regurgitation secondary to infective endocarditis following a dental procedure. The aortic valve was replaced with a Bjork-Shiley prosthesis, and four-vessel coronary artery bypass graft surgery was performed. The patient was febrile postoperatively. One out of six blood cultures demonstrated Staphylococcus epidermidis, felt to be a contaminant, and the fever was attributed to a drug reaction.

Six weeks later, the patient developed

Results

Among the 15 patients who underwent aortic valve surgery, pseudoaneurysm occurred at the aortotomy site in seven, the aortic cannulation site in two, the valvulotomy site in one, aortic vent site in one, a sinus of Valsalva in one, and the site of needle puncture in one patient (Table 1). The origin of the pseudoaneurysm was not clearly defined in two patients. One patient underwent both CABG and aortic valve surgery.

Among the 13 patients who underwent CABG surgery, pseudoaneurysm occurred at

Discussion

Postoperative pseudoaneurysms of the ascending aorta usually occur at sites of aortic wall disruption. During cardiopulmonary bypass, the ascending aorta is usually chosen as a site for cannulation1, 3, 13 and is a potential site for pseudoaneurysm formation. The aortic suture lines made during aortic valve replacement or the CABG insertion site are also potential locations.5, 14, 19 A needle may be inserted into the aorta during surgery for pressure measurements, or to purge the aorta of air,

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    Manuscript received January 26; revision accepted July 6.

    Reprint requests: Dr. Steiner, Suite 3607, 111 South 11th Street, Philadelphia 19107

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