This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anaesthesia
Drug used to prolong the action of LA in Hypeensive pts 
Select and explain. 
A. Clonidine, B. Felypressin, C. Dexmeditomidate, D. Noradrenalin
B: Felypressin
Answer: B: Felypressin 
Explanation: Vasoconstrictor are used along with local anaestheticsAdrenaline is the most commonly used vasoconstrictor. Less commonly phenylephrine is also used. Felypressin (synthetic vasopressin) does not affect BP & HR - Preferred in patients with cardiovascular disease(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no.270-271)