Authors' Contributions
postoperative nausea and vomiting, SD
Michael Dubilet and Benjamin F. Gruenbaum contributed equally to this work.Ultrasound-guided ESP block (T5 level). Red line: transverse process of the T5 thoracic vertebra. Green line: erector spinae muscle. Black line: needle with local anesthetic spraying.Study protocol.Consort flow diagram of present study.Comparison of demographic characteristics, admission diagnosis, length of hospital stay, and types of surgery as mean ± SD, 
Comparison of hemodynamic parameters in the postoperative period as mean ± SD.
Comparison of perioperative outcomes as median (IQR).
Comparison of incidences of postoperative nausea and vomiting as 
