Long-term functional recovery after facial nerve transection and repair in the rat

BACKGROUND: The rodent model is commonly used to study facial nerve injury. Because of the exceptional regenerative capacity of the rodent facial nerve, it is essential to consider the timing when studying facial nerve regeneration and functional recovery. Short-term functional recovery data following transection and repair of the facial nerve has been documented by our laboratory. However, because of the limitations of the head fixation device, there is a lack of long-term data following facial nerve injury. The objective of this study was to elucidate the long-term time course and functional deficit following facial nerve transection and repair in a rodent model. METHODS: Adult rats were divided into group 1 (controls) and group 2 (experimental). Group 1 animals underwent head fixation, followed by a facial nerve injury, and functional testing was performed from day 7 to day 70. Group 2 animals underwent facial nerve injury, followed by delayed head fixation, and then underwent functional testing from months 6 to 8. RESULTS: There was no statistical difference between the average whisking amplitudes in group 1 and group 2 animals. CONCLUSION: Functional whisking recovery 6 months after facial nerve injury is comparable to recovery within 1 to 4 months of transection and repair, thus the ideal window for evaluating facial nerve recovery falls within the 4 months after injury

In the Eye of the Beholder:Changes in Perceived Emotion Expression after Smile Reanimation

Background: Tools to quantify layperson assessments of facial palsy are lacking. In this study, artificial intelligence was applied to develop a proxy for layperson assessments, and compare sensitivity to existing outcome measures. Methods: Artificially intelligent emotion detection software was used to develop the emotionality quotient. The emotionality quotient was defined as the percentage probability of perceived joy over the percentage probability of perceived negative emotions during smiling, as predicted by the software. The emotionality quotient was used to analyze the emotionality of voluntary smiles of normal subjects and unilateral facial palsy patients before and after smile reanimation. The emotionality quotient was compared to oral commissure excursion and layperson assessments of facial palsy patients. Results: In voluntary smiles of 10 normal subjects, 100 percent joy and no negative emotion was detected (interquartile ranges, 0/1). Median preoperative emotionality quotient of 30 facial palsy patients was 15/-60 (interquartile range, 73/62). Postoperatively, median emotionality quotient was 84/0 (interquartile range, 28/5). In 134 smile reanimation patients, no correlation was found between postoperative oral commissure excursion and emotionality quotient score. However, in 61 preoperative patients, a moderate correlation was found between layperson-assessed disfigurement and negative emotion perception (correlation coefficient, 0.516; p <0.001). Conclusions: Computer vision artificial intelligence software detected less joy and more negative emotion in smiles of facial palsy patients compared with normal subjects. Following smile reanimation, significantly more joy and less negative emotion were detected. The emotionality quotient was correlated with layperson assessments. The simplicity, sensitivity, and objectivity of the emotionality quotient render it an attractive tool to serve as a potential proxy for layperson assessment, an ideal outcome measure in facial palsy

Nasolabial Fold Dynamics: Implications for Facial Paralysis and Facial Reanimation Surgery

ObjectivesIn patients with facial paralysis, facial reanimation surgery may be needed to normalize facial soft tissue function/movements. Critical for this normalization is the dynamics of the nasolabial folds (NLFs). The objective of this prospective, observational study was to determine the 3D morphologic dynamics of the NLFs in patients with unilateral facial palsy and normal subjects.Settings and Sample Population3D facial soft tissue movement data collected from adults with unilateral, facial paralysis (Bell's Palsy, n=36); and (2) an age‐ and sex‐frequency matched control group (n=68).Materials and MethodsMovement data were collected during repeated animations from participants using a video‐based motion capture system. Movement in terms of displacement and asymmetry of the NLFs, nasal, and circumoral regions were analyzed in the lateral, vertical and depth planes; as well as movement of the commissure and NLFs relative to the lower lip midline. Two sample t tests were used to test for significant group differences.ResultsPatients NLFs had less mean displacement, greater mean asymmetry, and uncoordinated movements compared with the controls. For both groups during smiling, the NLF and commissure landmarks had approximately similar magnitudes of displacement (control range = 11‐14mm; patient range = 7‐10mm).ConclusionNLF dynamics during smiling were as significant as oral commissure excursion. Thus, an immobile NLF is an unnatural feature of facial animations. Surgical treatments that address impaired NFL movements must be considered to create a more natural surgical outcome especially during smiling.<br/

Head and Neck Squamous Cell Carcinoma in Western Uganda: Disease of Uncertainty and Poor Prognosis

Objectives Patients with head and neck squamous cell carcinoma (HNSCC) have symptoms that masquerade as benign conditions, resulting in late presentations. The objective is to describe characteristics and stages of patients with HNSCC and document their prognosis from clinical experience in western Uganda. Study Design Cross-sectional study with clinical follow-up. Setting Mbarara Regional Referral Hospital. Subjects and Methods Fifty-one participants were recruited from February to July 2016. A questionnaire was used for patient characteristics, and staging, serologic studies, biopsy for histopathology, and immunohistochemistry were investigated. Staging was subclassified as early (stage I and II) and late (stage III and IV). Analysis was done with Fisher’s exact test. Results Of 51 participants, 44 (86.5%) were male; the group had a mean age of 57.7 years, and 41 (80.1%) presented with late stage. Of 10 participants who presented with early stage, 6 (60%) had laryngeal HNSCC. The pharynx was ranked as the highest subsite (n = 19, 37.3%), followed by the oral cavity (n = 9, 17.6%), the larynx (n = 9, 17.6%), an unknown primary (n = 8, 15.7%), and sinonasal area (n = 6, 11.8%). Tobacco smoking, alcohol consumption, and prior use of traditional remedy were common characteristics among participants. Moderate differentiation was the most common grade (n = 23, 45.1%). Helicobacter pylori , Epstein-Barr virus, human immunodeficiency virus, and human papilloma virus type 16 were identified among 51 participants. However, none could afford referral for radiotherapy; hence, 1-year survival was 4%. Conclusion The majority of our patients with HNSCC present at late stage, and the prognosis is poor. There is great need for preventative community-based education and early screening services to save our population

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

Outcome Tracking in Facial Palsy

Outcome tracking in facial palsy is multimodal, consisting of patient-reported outcome measures, clinician-graded scoring systems, objective assessment tools, and novel tools for layperson and spontaneity assessment. Patient-reported outcome measures are critical to understanding burden of disease in facial palsy and effects of interventions from the patient perspective. Clinician-graded scoring systems are inherently subjective and no 1 single system satisfies all needs. Objective assessment tools quantify facial movements but can be laborious. Recent advances in facial recognition technology have enabled automated facial measurements. Novel assessment tools analyze attributes such as spontaneous smile, emotional expressivity, disfigurement, and attractiveness as determined by laypersons