Table 1.

Trial Schedule

Time Point	Study Period
	Enrolment	Allocation	Post-Allocation
	−1 D	0	PRE	POS 6h	POS 12h	POS 24h	POS 48h	POS 30d	POS 90d
Enrolment
Eligibility Screen	×
Informed consent	×
Allocation		×
Interventions
Low SAPB			×
Placebo control			×
Assessments
QoR-40 score						×	×	×	×
NRS score				×	×	×	×	×	×
Opioid consumption				×	×	×	×
PCIA press counts					×		×
Consumption of analgesic drugs except opioid				×	×	×	×
Adverse effects			×	×	×	×	×
Chronic pain									×

Abbreviations: PRE, preoperative; POS, postoperative; SAPB, serratus anterior plane block; NRS, numeric rating score; QoR-40 score, quality of Recovery-40.