I Recently Had A Bp Of 90/40. I Had Surgery

i recently had a bp of 90/40. i had surgery for a lumbar spine. extra fusion extra segment, spine fixation device, apply spine prosthetic device, removal of spinal lamina and spinal lamina add. This was at S1-L5, L5-L4. my bp has been constantly low since this proceddure. additionally, a AAA was repaired on 8/19/15 with a stent inserted into a 5cm aneurysm at the bifurcation. any reason i should be concerned with this low bp. it hasn't been above 100 since before 3/1.