Hair shock loss after hair transplant?

Shock loss is due to the loss of normal hair whether it is from donor site or recipient area.  It can occur with both FUE and strip procedures.  Usually if it occurs it will take place in the recipient area.  
Shock loss from hair transplant can occur due to the following:
Anesthesia-  excessively long procedures taking longer than 12 hours can induce shock loss more likely.  the repeated use of lidocaine, marcaine, and perhaps most importantly epinephrine can affect nourishment of the hairTraumatic harvest-  In strip surgery, traumatic harvest can induce shock loss.  Recipient area trauma- during the incision making process the hairs are either crushed or cut and damaged during the process. 
Ways to minimize shock loss are as follows:
Improve recipient bed and donor area environment.  Make your recipient environment improved by addition of growth factors and/or PRP to help reduce incidence of shock loss to native hairs.Use of Rogaine and Propecia- can help miniaturized hair become more stable and less likely to fall out during procedure9xRobotArtas-  The latest version of the robot can make recipient sites and can determine angle of existing hair and help ensure that the angle will not damage existing hair.  Especially helpful in patients where you are transplanting hair to create densityMinimize anesthesia time and procedure time- We limit number of grafts to a safe number per session.  Extended anesthesia periods and harvest times can cause patients to have a higher chance of shock loss.  The 9x Robot harvests between 1000-1500 grafts per hour making it superior to previous additions and traditional FUE approaches.Best,
Anil Shah

Not everyone experience shock hair loss after surgery. In fact if most people should not experience it if the surgery was well planned.  In other words, doctors would likely NOT recommend surgery if shock hair loss risk is too high.

Shock loss refers to the loss of hair in the regions where there was a harvest or transplant.  Noticeable shock loss is rare.  Do not confuse this with the loss of the transplanted hair that will occur within weeks of the procedure.  This is normal and common.

Shedding
after a hair transplant occurs but can be prevented in most men if they use the drug propecia is unusual. If the shedding is in the transplanted area, the new grafts, when they
grow, will off set it. If the shedding is from all over the front and top of
the head it might well be shock loss which usually accelerates the hair loss that
you might have seen two years after a hair transplant had you not been on the
drug. If you are developing a more advanced balding pattern with acceleration
of your hair loss, which a Bulk Measurements with the HAIRCHECK instrument can
provide, it will show over a one year time frame, what exactly is your hair
loss (in numbers) and then you and your doctor need to develop a MASTER PLAN
for what may happen to you. If you just recently had the hair transplant and are not on finasteride (Propecia), then you might ask your doctor ti prescribe it.