Right, there are operations that are sometimes performed with minimal (or sometimes even 0 sedation) with just a nerve block (regional anesthesia) which impairs

Right, there are operations that are sometimes performed with minimal (or sometimes even 0 sedation) with just a nerve block (regional anesthesia) which impairs sensation locally (like you get when a dentist numbs up your mouth, but you’re still awake). They have the same rates of cognitive dysfunction afterward.