This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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 bispectral index of general anaesthetic drug with low potency
B: Sedative agent for intubated patients
Answer: B: Sedative agent for intubated patients 
Explanation: Ans. is 'b' i.e., Sedative agent for intubated patients Dexmeditomidine It is a centrally acting a-2 adrenergic agonist It is approved by F.D.A. for sho term (<24 hours) continuous IV sedation of adults who are tracheally intubated. Its use as an anaesthetic agent is not recommended but it is useful in patients with brain injury and ongoing sedation needs