Anaesthesia The ideal muscle relaxant used for a neonate undergoing porto-enterostomy for biliary atresia is: A Atracurium. B Vecuronium C Pancuronium. D Rocuronium. 💡 Explanation The ideal muscle relaxant used for a neonate undergoing porto-enterostomy for biliary atresia is: ✓ Correct Answer: A. Atracurium.