Which of the following is TRUE of Bell's palsy? (A) Sudden...

Which of the following is TRUE of Bell's palsy?
(A) Sudden onset is common.
(B) Preservation of motor function in the upper face is seen.
(C) Associated pain generally rules out the diagnosis.
(D) Steroids are indicated and should be started at any phase of the disease.

Key Concepts

Bell's Palsy

Bell's palsy is an acute, typically idiopathic, peripheral facial nerve paralysis that results in a sudden onset of unilateral weakness or paralysis of the facial muscles. The condition affects the motor fibers of the facial nerve, leading to an inability to control facial expressions on the affected side.

Facial Nerve Anatomy and Innervation

The facial nerve (cranial nerve VII) innervates the muscles of facial expression. In peripheral lesions such as Bell's palsy, both the upper and lower facial muscles are affected because the entire nerve is compromised, unlike central (upper motor neuron) lesions which usually spare the upper face due to bilateral cortical innervation.

Acute Onset of Neurological Symptoms

A hallmark of Bell's palsy is its rapid or sudden onset, where patients can experience facial paralysis within hours. This acute presentation is critical in differentiating it from other causes of facial weakness and underscores the importance of prompt medical assessment.

Corticosteroid Therapy in Acute Neurological Conditions

Corticosteroids are a mainstay of treatment in Bell's palsy when administered early, ideally within 72 hours of symptom onset, as they help reduce inflammation and edema of the facial nerve. Timely steroid treatment has been shown to improve recovery outcomes, highlighting the importance of early intervention in acute peripheral nerve conditions.

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