A 6-year-old girl was brought to a pediatric emergency department (ED) in Atlanta by her mother. The mother stated that during the previous hour, she had noticed that her daughter’s face seemed weaker on the right side.
The night before, the child had said, “I can’t blink my eye”; when her mother asked her to demonstrate, the child seemed to be able to blink both eyes appropriately, and she had no further complaints. The next morning, the child complained of the light being too bright and asked to wear her mother’s sunglasses. In the course of the day, she continued to complain of eye discomfort, which she described as “stinging” and “sore.” The mother could see nothing abnormal, but by late afternoon noticed that her daughter’s smile and facial movements were asymmetrical. She immediately took her to the pediatric ED.
The child had no significant medical history and no surgical history. Her vaccination schedule was current, and she denied any recent illnesses. The mother could recall no exposures to infections or tick bites, no rashes, and no trauma to the face or head. The mother and child were visiting Atlanta from northeastern Florida.
The review of systems was negative for headache, fever, chills, rash, earache, sore throat, cough, rhinorrhea, vision changes, weight loss, or change in appetite or disposition. The child was afebrile, and the other vital signs were within normal limits.
Physical examination revealed an alert child who was calm and conversant. Her height was 45” and weight, 43 lb. Otoscopic exam showed normal ears and tympanic membranes with no sign of otitis media or ear pathology. No throat redness, tonsillar enlargement, or lymphadenopathies were noted. Breath sounds were clear, and heart rhythm and rate were regular without murmur.
The patient’s left eye appeared normal, and the right eye was mildly erythematic without drainage or swelling; since corneal abrasion was not suspected, a slit lamp examination was not performed. Upon neurologic examination, right eye ptosis with incomplete lid closure, asymmetrical mouth movement with smile, and a diminished nasal labial fold crease were noted on the right side. When the child was asked to raise her eyebrows and wrinkle her forehead, asymmetrical forehead creases were apparent. All other cranial nerve functions were intact, and motor and sensory responses, including gait and reflexes, were assessed as normal. Unilateral dysfunction of right-sided cranial nerve VII (CN VII), including forehead involvement, was confirmed, consistent with a grade of III to IV on the House-Brackmann (maximum, VI)1,2 facial nerve grading scale.
Based on the rapid onset of unilateral facial nerve paresis (FNP) and an otherwise normal exam, the patient was diagnosed with Bell’s palsy. No further testing was done, and the child was given a dose of oral prednisolone 40 mg in the ED, with a prescription for four more days of oral prednisolone at 15 mg bid. The need for eye protection and lubrication was emphasized to the mother, who was given lubricating eye drops to administer. The mother was also instructed to follow up with the child’s primary care practitioner upon their return to Florida.
The child was seen by her pediatrician three days later. Her facial paresis had not worsened in the interim, and the pediatrician declined to extend the course of corticosteroids or to add an antiviral medication. At the mother’s request, the child was referred to a pediatric otolaryngologist, who saw her the following day and adjusted the treatment plan. The child was prescribed prednisolone elixir 20 mg bid for one week, followed by a tapering dose for the second week. In addition, she was prescribed oral acyclovir 400 mg qid for 10 days. Her mother was instructed to return with the child in one week for audiometry testing.
Discussion
Idiopathic FNP, commonly referred to as Bell’s palsy, is defined as an acute unilateral paresis of the facial nerve without detectable underlying cause.3,4 It most commonly occurs among persons ages 15 to 45, with a prevalence rate of 15 to 30 cases per 100,000 persons. The peak incidence of Bell’s palsy is in the fourth decade of life. Diabetic patients and pregnant women are disproportionately affected by idiopathic FNP.2,5 About 8% to 10% of patients will experience a recurrence of Bell’s palsy within 10 years.2,6
Pediatric FNP can be congenital or acquired. Congenital FNP is most often associated with birth trauma and occurs at a rate of 2.1 cases per 1,000 births. Rare genetic syndromes can also manifest with FNP and will most often present with other syndromic anomalies noted at birth.7