Pattern of contrast dye spreading

Cloud-like

(n = 9)

Longitudinal

(n = 28)

P value

Intraoperative fentanyl consumption (μg)

94.4 (15.7)

91.1 (26.9)

0.66

Frequency of additional analgesics within 12 h after surgery

PCA use (times)

0.3 (0.7)

0.2 (0.5)

0.64

NSAID (times)

0.4 (0.4)

0.5 (0.6)

0.79

Incidence of side effects, n

Hypotension

0

0

N/A

PONV 1 h after surgery

0

1

0.56

PONV 6 h after surgery

1

1

0.38