Insufficient unilateral cerebral perfusion during emergent aortic arch surgery.

A rare case of insufficient right-sided unilateral cerebral perfusion during emergent aortic arch replacement in a patient with an acute aortic dissection is reported. On the basis of intraoperative monitoring using near-infrared spectroscopy, the insufficient perfusion of the contralateral hemisphere was detected and the bilateral perfusion was performed, which led to normalization of cerebral perfusion and an uncomplicated neurological outcome.