Fate of the native aorta after repair of acute type A dissection: a magnetic resonance imaging study.

OBJECTIVE

To determine late patency of the aortic false lumen and propensity for aneurysm formation after repair of type A dissection.

DESIGN

Retrospective follow up study.

SETTING

Regional cardiac surgical unit.

PATIENTS

28 patients after repair of type A dissection.

METHODS

Magnetic resonance imaging (MRI) was performed between 6 weeks and 12 months after operation.

RESULTS

A patent distal false lumen with demonstrable blood flow was found in 22 patients (78%). Only six patients had complete obliteration of the false lumen by thrombus. The conduct of operation did not influence this. Nine patients (32%) showed aneurysmal dilatation of the false lumen and three had a repeat operation.

CONCLUSIONS

So-called "successful repair" of aortic dissection does not obliterate the distal false lumen. MRI is a safe and effective radiological procedure for determining patency and dilatation in the false lumen. Patients with type A dissection with blood flow in the false lumen should be studied every 6 months to look for aneurysmal dilatation.