Alper Güneş1, Şerife Gülhan Konuk2, Helin Deniz Demir2, Semiha Kurt3, Erdinç Naseri4, Ünal Erkorkmaz5. 1. School of Medicine, Department of Ophthalmology, Gaziosmanpaşa University, Tokat, Turkey. alpergunes@gmail.com. 2. School of Medicine, Department of Ophthalmology, Gaziosmanpaşa University, Tokat, Turkey. 3. School of Medicine, Department of Neurology, Gaziosmanpaşa University, Tokat, Turkey. 4. Park Hayat Hospital, Afyon, Turkey. 5. School of Medicine, Department of Biostatistics, Sakarya University, Sakarya, Turkey.
Abstract
PURPOSE: Coronary bypass surgery is emphasized in aetiology of ischemic optic neuropathy. Our aim in this study was to investigate the pattern visual evoked potentials (PVEP) in patients before and after coronary bypass surgery. METHODS: Thirty-one patients were included in the study. After a full ophthalmological evaluation, PVEP was assesed in the pre and postoperative periods. Operative times, hematological parameters, blood pressures, number of transfusions, body temperatures, anaesthetic drugs and systemic illnesses were recorded for each patient. RESULTS: The mean age of the patients were 59 ± 10.4 years. There was 22 men and 9 women in the study. Only 3 of them needed transfusion during the surgery. The mean duration of the surgery was 3.2 ± 0.7 h. None of the patients had a history of visual disturbance or postoperative ischemic optic neuropathy. The mean VEP P100 amplitude was not statistically significantly different but the mean VEP P100 latency showed statistically significant difference between the preoperative and postoperative periods. (p = 0.014) This significance was more appereant in patients with systemic illnesses. (p = 0.023) There was a positive correlation between the age and VEP P100 latency (r = 0.402, p < 0.05). CONCLUSIONS: Although surgical techniques and equipments are developing each day in the field of cardiopulmonary bypass surgery, the contributing factors such as hypothermia, anemia and diabetes still seem to affect neurophysiological functions even after a noncomplicated surgery.
PURPOSE: Coronary bypass surgery is emphasized in aetiology of ischemic optic neuropathy. Our aim in this study was to investigate the pattern visual evoked potentials (PVEP) in patients before and after coronary bypass surgery. METHODS: Thirty-one patients were included in the study. After a full ophthalmological evaluation, PVEP was assesed in the pre and postoperative periods. Operative times, hematological parameters, blood pressures, number of transfusions, body temperatures, anaesthetic drugs and systemic illnesses were recorded for each patient. RESULTS: The mean age of the patients were 59 ± 10.4 years. There was 22 men and 9 women in the study. Only 3 of them needed transfusion during the surgery. The mean duration of the surgery was 3.2 ± 0.7 h. None of the patients had a history of visual disturbance or postoperative ischemic optic neuropathy. The mean VEP P100 amplitude was not statistically significantly different but the mean VEP P100 latency showed statistically significant difference between the preoperative and postoperative periods. (p = 0.014) This significance was more appereant in patients with systemic illnesses. (p = 0.023) There was a positive correlation between the age and VEP P100 latency (r = 0.402, p < 0.05). CONCLUSIONS: Although surgical techniques and equipments are developing each day in the field of cardiopulmonary bypass surgery, the contributing factors such as hypothermia, anemia and diabetes still seem to affect neurophysiological functions even after a noncomplicated surgery.
Authors: Brian A Trethowan; Helen Gilliland; Aron F Popov; Barathi Varadarajan; Sally-Anne Phillips; Louise McWhirter; Robert Ghent Journal: J Cardiothorac Surg Date: 2011-11-21 Impact factor: 1.637