Facial Nerve Exploration for Known or Suspected Transection: The Massachusetts Eye and Ear Experience.

Background: There is no ideal test to determine likelihood of spontaneous recovery after post-traumatic and postsurgical facial palsy (FP). Objective: Among patients with unexpected FP undergoing facial nerve (FN) exploration for suspected discontinuity, we endeavored to discern whether intraoperative findings, repair type, and time to exploration impact FN recovery, as measured by electronic Facial Clinimetric Evaluation (eFACE) and FaCE scales. Methods: Retrospective cohort study of 42 adult patients who underwent FN exploration. Results: FN injury resulted from either surgery ( n  = 29) or trauma ( n  = 13). Average time to repair was 68.4 (standard deviation 79.6) days. Postoperative improvements were observed in total eFACE (73.3-86.5; p  < 0.0001) and FaCE (21.5-38.1; p  = 0.0214) scores. Distal FN injuries were most common ( n  = 29) and had best recovery (percentage change in eFACE 57.2% vs. 34.3% main trunk, p  = 0.0306). Discontinuity injuries ( n  = 33) repaired with primary coaptation ( n  = 18) had noninferior outcomes compared with cable graft repair ( n  = 16; percentage change in eFACE 49.6% vs. 39.2%, p  = 0.3470). Denervation times <3 months yielded better recovery using percentage change in eFACE score (56.9% vs. 33.1%, p  = 0.0270). Conclusions: Surgical exploration for unexpected FP allows for direct visualization of anatomical nerve status and timely repair.