From: Comparison of intraoperative blood loss during spinal surgery using either remifentanil or fentanyl as an adjuvant to general anesthesia
Remifentanil (n = 35)
Fentanyl (n = 29)
Age (years)
75 ± 9
74 ± 8
Sex (M/F)
21/14
13/16
Height (cm)
155 ± 10
152 ± 9
Weight (kg)
56 ± 10
56 ± 11
ASA physical status (I/II/III)
1/24/10
2/21/6
History of hypertension (n)
22
20