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Biotin-Thiamine-Responsive Basal Ganglia Disease: Case Report and Follow-Up of a Patient With Poor Compliance.

Background: Biotin-thiamine-responsive basal ganglia disease (BTBGD) is a rare treatable autosomal recessive neurometabolic disorder characterized by progressive encephalopathy that eventually leads to severe disability and death if not treated with biotin and thiamine supplements.

Objectives: We aimed to determine the optimal management of BTBGD presenting in acute encephalopathic episodes.

Method: Case report.

Results: An 8-year-old girl born to consanguineous parents was diagnosed with BTBGD at the age of 3 years after presenting with acute encephalopathy and ataxia. The patient was treated with biotin and thiamine, and the family was instructed to continue these medications for life. When she was 7 years old, her supplements were stopped for 2 weeks for social reasons. Afterward, the patient began to have tremor in both hands and an unsteady gait. The family then resumed the medications at the usual dosages. However, the patient remained symptomatic. The patient was admitted with acute BTBGD because of discontinuation of medications. The patient's condition was then managed with high doses of intravenous thiamine and oral biotin. She showed gradual improvement after 48 hours. She was then discharged home 1 week later with residual mild upper and lower limb tremor, as well as right lower limb dystonia. Further follow-up showed a good neurological condition with no apparent long-term sequel. The family was further educated about the importance of strict compliance.

Conclusion: Patients with BTBGD should remain on lifelong treatment with thiamine and biotin. For those who present with acute relapse, we recommend inpatient treatment with high doses of intravenous thiamine and oral biotin. Further clinical research is required to determine the optimal doses and durations.

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