-transparent.png){kind=logo}
To evaluate the effects of ketamine, N2O, propofol on visual evoked potential (VEP) during fentanyl anesthesia, 14 patients undergoing transphenoid pituitary dissections were studied. Visual stimulation was done by using the goggles with red light diodes through closed eyelids and responses were recorded in one channel montage, Cz against Oz. The stimulus frequency was 1.9 flashes/sec. The VEPs were recorded from skin incision until the opening of the dura. For comparison, the preanesthesia to anesthesia values were determined. The ratio for N2 (N75) latency were 100.5 +/- 13.9% in ketamine group, 104 +/- 3.5% in N2O group, 100.5 +/- 4.2% in propofol group. The ratios for P2 (P100) latency were 97.45 +/- 5.7% in ketamine group, 101.9 +/- 3.5% in N2O group, 96.8 +/- 5.5% in propofol group. For N2P2 amplitude, the ratios were 36.3% +/- 31.4% in ketamine group, 138.5 +/- 58.0% in N2O group, 80.8 +/- 42.2% in propofol group. The percentage of inadequate recordings were 2.5 +/- 4.3% in ketamine group, 19.2 +/- 2.2% in N2O group and 20.6 +/- 16.0% in propofol group. The percentage of false positive results were 0 +/- 0% in ketamine group, 9.8 +/- 19.9% in N2O group, 12.7 +/- 13.2% in propofol group. Satisfactory anesthesia was achieved in all groups except for ketamine group which required additional medications for elevated blood pressure and intracranial pressure, and postoperative nausea and vomiting. It is concluded that there was great variability of VEP during anesthesia and surgery. Amplitude rather than latency changes were observed during anesthesia combined with fentanyl.(ABSTRACT TRUNCATED AT 250 WORDS)
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
August 2004,
Masui. The Japanese journal of anesthesiology,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
August 1990,
Masui. The Japanese journal of anesthesiology,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
May 1985,
Anesthesiology,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
June 2002,
British journal of anaesthesia,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
June 2000,
Anesthesia and analgesia,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
November 1999,
European journal of anaesthesiology,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
March 1989,
The Mount Sinai journal of medicine, New York,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
June 2010,
Journal of anesthesia,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
November 1989,
Canadian journal of anaesthesia = Journal canadien d'anesthesie,
W Y Hou, and
W Y Lee, and
S M Lin, and
C C Liu, and
L Susceto, and
W Z Sun, and
S Y Lin
December 2009,
Journal of clinical anesthesia,
