Adverse events within the 48-hour postoperative period in both groups
| Adverse effects | Group 1 PIB ESPB with saline (n=23) | Group 2 PIB ESPB with ropivacaine (n=27) | P value |
| Vomiting | 4 (17) | 0 (0) | 0.01 |
| Hypotension | 2 (13) | 1 (4) | NS |
| Bradycardia/dysrhythmia | 0 (0) | 1 (4) | NS |
| Fever | 2 (13) | 2 (8) | NS |
| Pruritus | 1 (5) | 0 (0) | NS |
| Respiratory depression/apnea | 0 (0) | 1 (4) | NS |
| Pulmonary complication | 2 (13) | 1 (4) | NS |
| Displaced catheter (patient) | 2 (13) | 4 (15) | NS |
| Redness/inflammation at catheter entry point | 0 (0) | 0 (0) | NS |
ESPB, erector spinae plane block; PIB, programmed intermittent bolus.