From: Efficacy of programmed intermittent bolus epidural analgesia in thoracic surgery: a randomized controlled trial
PIB (n = 21)
CEI (n = 21)
P-value
n (%)
Adverse effects
Nausea, vomiting
8(38.1)
5(23.8)
0.32
Urinary retention
2(9.5)
3(14.3)
0.63
Feeling dizzy on standing up
4(19.0)
1(4.7)
0.15