Anaesthesia The volatility of an anesthetic agent is directly proportional to lowering the flow in the portal vein. Portal flow is maximally reduced by – A Ether B Halothane C Isoflurane D Enflurane 💡 Explanation The volatility of an anesthetic agent is directly proportional to lowering the flow in the portal vein. Portal flow is maximally reduced by – ✓ Correct Answer: B. Halothane