Intramural hematoma of the thoracic aorta.

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This study was designed to clarify the optimal treatment mode of patients with intramural hematoma (IMH) of the thoracic aorta. From 1992 through 1997, 51 patients underwent surgical repair or medical treatment of IMH of the thoracic aorta. There were 36 male and 15 female patients, aged between 49 and 79 years with a mean of 67 years. The ascending aorta and/or aortic arch was involved in 18 patients (group I), whereas the descending thoracic aorta was affected in 33 (group II). The presence of intimal disruption in IMH was confirmed in 10 of group I and 13 of group II patients. For group I patients 13 required aortic arch repairs and the remaining 5 underwent conservative therapy including anti-hypertensive medication. Primary indications for immediate surgery were: cardiac tamponade in 5 patients, aortic dissection superimposed on IMH in 2, and persistent pain with an aortic arch aneurysm in 1, respectively. Early elective operations were done for enlarged ulcer in 3 patients and aneurysmal dilatation in 2 of which 1 had a coexisting aortic arch aneurysm. The 2-year survival rate after diagnosis was 94% with an operation-free rate of 25%. Nine of the group II patients experienced surgical intervention of which 8 had intimal disruption, 4 patients received urgent replacement of the descending thoracic aorta for massive pleural effusion and 1 had the aortic arch replaced for a coexisting aneurysm with persistent pain. All other patients underwent conservative treatment and 4 of them had to be shifted to early surgery during the initial hospitalization because of an enlarged ulcer. The 5-year survival rate in group II patients was 63% with an operation-free survival rate of 66%. On the basis of our experience early operation is recommended for almost all patients with ascending aortic IMH, and medical therapy for those with descending aortic involvement unless complication developed. However, the presence of intimal disruption may require early surgical treatment even in the patients with descending thoracic IMH.