“…General anesthesia was induced and then maintained with opioids, such as alfentanil ( Ferreira Laso et al , 2014 ), fentanyl ( Couceiro et al , [ 11 ] ; Gürkan et al , 2018; Ilfeld et al , 2014; Mohamed et al , 2013; Neethu et al , 2018; Terkawi et al , 2014; Wang et al , 2018 ), remifentanil ( Wang et al , 2019 ) and sufentanil ( Versyck et al , 2017; Wang et al , 2019; Yao et al , 2019 ). For the postoperative pain management, four studies ( Couceiro et al , [ 11 ] ; Cros et al , [ 12 ] ; Ferreira Laso et al , 2014; Ilfeld et al , 2014 ) provided infiltration of the chest wall ipsilateral to the mastectomy with local anesthetic; acetaminophen and other NSAIDs were systematically administered. Two studies did not report the anesthesia protocol ( Campbell et al , 2014 [ 10 ] ; Lanier et al , 2018 ).…”