Bilateral Erector Spinae Plane Block After Elective Cesarean Section

"bilateral TAP block: while the patient in the supine position, a linear ultrasound (US) transducer (Phillips Saronno Italy) is placed transversally on the anterolateral abdominal wall in the midaxillary line between the iliac crest and the costal margin identifying external oblique, internal oblique and transversus abdominis muscles. The TAP is between internal oblique and transversus abdominis.~A 22-G needle (spinocan, B.Braun, melsungen AG, Germany) is introduced anteriorly to the transducer and advanced to reach the TAP between internal oblique muscle and transversus abdominis muscle. After careful aspiration to exclude vascular puncture, 20 ml 0.5 % bupivacaine is injected causing an elliptical separation of the two muscles. The same procedure is done on the other side."