In medicine it is said of the monitoring and control of a patient during a surgical operation. It is formed by the prefix trans- ( "through" ) operative ( "relative to an operation" ) . See surgical, preoperative, postoperative.
Transoperative grammatical error by TRANSOPERATIVE The prefix TRANS means through, beyond and here it is intended to explain some process after surgery, so it is appropriate to use POSTOPERATIVE or TRANSOPERATIVE.