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Peripheral Facial palsy (PFP) is generally considered a benign condition with good recovery and no sequelae. Yet, a distortion in the gesture and abnormal blinking, as those typically found in blepharospasm, can potentially develop early on. Such abnormal movements seem to be related to remodelling mechanisms that take place in the process of recovery. We report 2 cases where such clinical features became evident following an idiopathic PFP, as a result of reciprocal inhibition of orbicularis oculi and levator palpebrae. Hence, the neurophysiological study revealed an increased frequency in the blinking, with bilateral trigeminal-facial facilitation and, most notably, a disturbance that only became evident when the eyes were maintained wide open. Interestingly, those features were not reproduced in other tasks where the blinking conditions had not been altered. Our findings suggest that sensory inputs (reflex afferent pathways) are involved in such abnormal movements. The insufficient eyelid closure (lagophthalmus) in the context of PFP is likely to account for the exaggerated corneal vulnerability, thus resulting in abnormal mechanisms of adaptation.

Aims: The aim of this study was to review the value of neurophysiological exploration in peripheral facial paralysis in the literature and in our own experience., Method: Peripheral facial paralysis is a frequently occurring cranial neuropathy with an acute presentation. Its striking clinical expression is usually in strong contrast to its benign prognosis, except for a small percentage of cases in which the existence of acute injury to the nerve (axonotmesis) will cause it to progress unfavourably, either due to the absence of nerve regeneration or because this is inadequate or insufficient. A neurophysiological study aids diagnosis and the functional and prognostic assessment., Conclusions: We recommend the utilisation of standardised studies involving a comprehensive electromyographic and electroneurographic evaluation of the facial territory, including reflexology (blink reflex). Use of a suitable methodology in the neurophysiological study of this neuropathy will allow us to complete the diagnosis and to evaluate progress, even from very early days (early surgical approach prior to the onset of nerve degeneration), all of which is decisive in the prognosis of injury throughout the process.