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
Use of dexemditomidine 
Select and explain. 
A. Prolong action of LA in hypeensive patients, B. Sedative agent for intubated patients, C. Increases bioavailability of regional anaesthetic drug, D. Helps in reducing bispictral index of general anaesthetic drug with low potency
B: Sedative agent for intubated patients
Answer: B: Sedative agent for intubated patients 
Explanation: DexmedetomidineIt is a centrally acting a-2 adrenergic agonistIt is approved by f.D.A for sho-term (<24 hours) continuous IV sedation of adults who are tracheally intubatedIts use as an anaesthetic agent is not recommended but it is useful in patients with brain injury and ongoing sedation needs.(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no. 288)