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Table 1 Study visits of the PRE-EASE trial

From: Preemptive Infiltration with Betamethasone and Ropivacaine for Postoperative Pain in Laminoplasty or Laminectomy (PRE-EASE): study protocol for a randomized controlled trial

  Study period
Enrollment Allocation Post-allocation
Time points Preoperative 0 day (d) Surgery 2 h 4 h 8 h 1 d 2d 3d 1 week (w) Discharged 2w 4w 6w 3 months (m) 6 m
Enrollment
Eligibility screening X                
Informed consent X                
Random allocation   X               
Interventions
Betamethasone plus ropivacaine   X               
Ropivacaine   X               
Assessments
Baseline data X X X              
Intraoperative data    X              
Cumulative butorphanol consumption      X X X X         
Patients with no butorphanol         X         
Total PCA button press count         X         
Time of first analgesia demand      X X X X         
VASM     X X X X X X X   X X X X X
VASR     X X X X X X X   X X X X X
PSS     X X X X X X X   X X X X X
PONV     X X X X X         
RSS     X X X X X         
WHOQOL-BREF X                X
ODI X             X X X X
POSAS                 X
AEs                 
Nausea     X X X X          
Vomiting     X X X X          
Gastritis     X X X X          
GI bleeding     X X X X          
Delayed wound healing     X X X X