Anterior ischemic optic neuropathy following off-pump cardiac bypass surgery.

Anterior ischemic optic neuropathy (AION) is a well-described cause of visual loss in patients who have undergone cardiac surgery with cardiopulmonary bypass. The etiology of AION following cardiac surgery with cardiopulmonary bypass is believed to be multifactorial. Microembolisation and pump-related platelet dysfunction have been considered risk factors for the development of AION following cardiac surgery with cardiopulmonary bypass. Currently, 10-15% of cardiac procedures are performed without cardiopulmonary bypass to reduce morbidity. To the best of our knowledge, this is the second report of a patient who underwent off-pump cardiac surgery and developed an AION postoperatively. The patient's potential risk factors were severe anemia, new onset of atrial fibrillation with rapid ventricular rate, hypotension postoperatively, a small optic disc, uncontrolled diabetes mellitus and a past medical history of hypertension and coronary artery disease.