West syndrome is a from of epileptic attacks of infants. Diagnosis of West syndrome includes: presence of the sudden violent flexion of the trunk and limbs, psychomotoric development retardation, especially after the onset of attacks, abnormal EEG records, and therapeutical problems. Clinical course and results of therapy were analysed in 66 children with West syndrome (39 boys and 27 girls). Children were divided into four groups, depending on etiology of the disease. Group 1 included 39 children with lesions to CNS during pregnancy; group 2-8 children with developmental CNS disorders, group 3-6 children with a history of encephalitis or meningitis, and group 4-13 children in whom etiology of West syndrome was unclear. Patients were treated with Synacthen-Depot in a daily dose of 0.03 mg/kg combined with other anti-epileptic agents. The most difficult to treat were those children in whom West syndrome occurred below 6 months of life, were psychomotor retarded before the onset of symptoms, hormonal treatment was introduced with delay, there were additional seizures of different etiology, and there were frequently recurrent infections.