Sofia Jaswal, Rashi Sarna, Richa Saroa and Sanjeev Palta. Determination of Tramadol as an Adjuvant to Ropivacaine in Utrasound Guided Erector Spinae Plane Block for Postoperative Analgesia after Sternotomy. RDMMR-V7 [Internet]. 2021 Oct. 28 [cited 2026 Jul. 22];:163-9. Available from: https://stm.bookpi.org/RDMMR-V7/article/view/4544