Anaesthesia

For a 78 yr old man for trans urethral resection of prostate, ideal anesthetic method is spinal anesthesia, this is because

General anesthesia causes more bleeding than spinal

Signs of hyponatremia can easily be detected under spinal

Spinal anesthesia abolishes the obturator nerve stimulation by electro cautery

Obstructive uropathy and renal failure may be associated with prostatic enlargement