Fig. 2. Changes in Bispectral Index values before, during, and after cross clamping of the descending thoracic aorta. Each  line represents data for each patient. Before = right before cross clamping; C15 = 15 min after cross clamping; C30 = 30 min after cross clamping; C45 = 45 min after cross clamping; DC15 = 15 min after declamping.