During general anaesthesia for orthognathic surgery:
Correct Answer: D
Rationale: Anaesthesia for orthognathic surgery balances airway and bleeding risks. Head-up positioning, not head-down, reduces venous congestion and airway soiling from blood head-down risks aspiration. Lidocaine with adrenaline (typically 1:80,000-1:200,000) minimizes bleeding via vasoconstriction, a standard infiltration. NSAIDs are used post-haemostasis for analgesia, not universally avoided, unless bleeding risk persists. Mandibular and maxillary nerve blocks (e.g., V2, V3) reduce opioid needs and enhance pain control, leveraging regional anaesthesia's precision in jaw surgery. Propofol TIVA may improve recovery versus volatiles, per studies, but isn't definitive. Nerve blocks' utility optimizes perioperative pain management, critical in extensive osteotomies.