Table 1. Physiologic Parameters

All values are mean ± SD.Paco²= arterial carbon dioxide tension; Pao²= arterial oxygen tension; Ht = hematocrit; Hb = Hemoglobin; temp = rectal temperature during the last hour of tcMEP recording; intervention = group A, short tcMEP reduction; ischemia = group B, prolonged tcMEP reduction.