Prevalence and pattern of multiple sclerosis in Benghazi, north-eastern Libya.

Area of Science:

• Neurology
• Epidemiology

Background:

• Multiple sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system.
• Geographic variations in MS prevalence suggest environmental or genetic influences.
• Libya's MS epidemiology remains largely undocumented.

Purpose of the Study:

• To determine the incidence and prevalence of multiple sclerosis (MS) in Benghazi, Libya.
• To characterize the clinical presentation of MS in the Libyan population.
• To compare the Libyan MS pattern with international data.

Main Methods:

• Retrospective case ascertainment of clinically definite and probable multiple sclerosis (MS) cases.
• Population-based incidence and prevalence rate calculations.
• Clinical data analysis focusing on neurological involvement patterns.

Main Results:

• Identified 21 cases of multiple sclerosis (MS) between July 1982 and June 1984.
• Calculated an incidence rate of 0.8 per 100,000 for 1983 (population aged 10-50).
• Reported a crude prevalence of 4 per 100,000 and age-adjusted prevalence of 5.9 per 100,000 in 1984.
• Observed a higher frequency of brainstem and cerebellar involvement, with less frequent optic-spinal and sphincter disturbances.
• The Benghazi MS cohort exhibits characteristics consistent with the Western pattern of MS.

Conclusions:

• Benghazi, Libya, falls within the medium frequency band for multiple sclerosis (MS).
• The clinical phenotype of MS in Benghazi resembles the Western pattern, distinct from the Asian pattern.
• Further research is warranted to explore etiological factors contributing to MS in this region.