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Bell, Sir Charles

(bel)

Scottish physiologist and surgeon, 1774-1842.

Bell law

Bell-Magendie law The fact that anterior spinal nerve roots contain only motor fibers and posterior roots only sensory fibers.
SYN: SEE: law of Magendie

Bell nerve

Long thoracic nerve; nervus thoracicus longus.

Bell palsy

Paralysis of the facial nerve.
SYN: SEE: Bell paralysis; SEE: facial palsy; SEE: facial nerve palsy; SEE: facial nerve paralysis; SEE: facial paralysis; SEE: idiopathic facial neuropathy

INCIDENCE
Approx. 25 people out of 100,000 experience an episode of facial nerve paralysis yearly.

ETIOLOGY
Bell palsy is usually caused by a reactivation of herpes simplex virus, but other infections such as syphilis or Lyme disease are sometimes implicated.

SYMPTOMS AND SIGNS
Paralysis of the facial nerve typically results in an asymmetrical facial appearance. Either side of the face may be affected. The affected patient is unable to raise one side of the mouth to smile or to wrinkle or raise the eyebrow on the same side. This peripheral nerve dysfunction is distinguished from strokes that alter facial movement by the involvement of both the forehead and the mouth. Paralysis of the face caused by strokes usually only limits movement of the oral muscles.


BELL PALSY Asymmetrical smile in patient with Bell Palsy

DIAGNOSIS
Bell palsy is diagnosed by physical examination. It should be distinguished from ischemic or hemorrhagic stroke, complicated migraine, brain tumors, central nervous system infections, Lyme disease and Guillain-Barré syndrome.

TREATMENT
Tapering doses of prednisone without antiviral drugs provide the most effective results. In addition, the affected eye should be protected from drying with artificial tears or unmedicated ointments. Some practitioners advise wearing sunglasses during the palsy or patching the eye to protect it from foreign bodies or drying.

IMPACT ON HEALTH
Partial facial paralysis is usually resolved within several months. The likelihood of complete recovery after total paralysis varies from 20% to 90% and is best in the young patient. Attacks recur in about 10% of cases. Complications that may arise from inability to close the eye include corneal drying and ulceration. Mild slurring of speech may occur because of paralysis of the muscles of the lower part of the face.

PATIENT CARE
To protect the affected eye, patients should be advised to use lubricating eye drops or prescribed ointments. Patching the eye or taping it shut at night prevents drying. Patients who experience unilateral sensitivity to loud noises may try ear plugs.

Bell paralysis

SEE: Bell palsy.

Bell phenomenon

Rolling of the eyeball upward and outward when an attempt is made to close the eye on the side of the face affected in peripheral facial paralysis.

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Citation

Venes, Donald, editor. "Bell, Sir Charles." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/752751/all/Bell__Sir_Charles.
Bell, Sir Charles. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/752751/all/Bell__Sir_Charles. Accessed June 25, 2019.
Bell, Sir Charles. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/752751/all/Bell__Sir_Charles
Bell, Sir Charles [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 June 25]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/752751/all/Bell__Sir_Charles.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Bell, Sir Charles ID - 752751 ED - Venes,Donald, BT - Taber's Medical Dictionary UR - https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/752751/all/Bell__Sir_Charles PB - F.A. Davis Company ET - 23 DB - Nursing Central DP - Unbound Medicine ER -