Anaesthesia used in microlaryngoscopy is –
Actually, no option is absolutely correct. However, option 'c' is the best one.
Option a & b can be excluded as In microlaryngoscopy tube of smaller diameter (4-6 mm) are used.
Option 'd' can be excluded as microlaryngoscopy is done either in local or general anaesthesia (not in sedation).
Now we are left with option 'c'. Pollard tube was the earliest tube which was used for Microlaryngoscopy. However, newer and better tubes are now available.
Pollarad tube of 10 mm diameter with heavy sedation
Pollarad tube of 15 mm diameter with topical xylocaine
Pollarad tube with infiltration block
Heavy sedation on and endotracheal intubation