Efficacy and Safety of Fentanyl as An Adjuvant To 0.75% Isobaric Ropivacaine in Epidural Anaesthesia for Infraumbilical Surgeries. International Journal of Environmental Sciences, [S. l.], p. 3421–3428, 2025. DOI: 10.64252/gxa7s461. Disponível em: https://theaspd.com/index.php/ijes/article/view/7076.. Acesso em: 12 oct. 2025.