861 Vascular dementia presenting as rapidly progressive dementia secondary to zolpidem

Abstract

Introduction Rapidly progressive dementia is a condition with a wide differential which remains difficult to accurately diagnose. The potential pathologies responsible include thyroid, vitamin, and electrolytes abnormalities, infectious, and malignant causes. Vascular dementia, however, typically has a slow and insidious presentation. Zolpidem (Ambien) is among the top 50 prescribed medications in the US. Report of case(s) An 84-year-old Caucasian male with a past medical history of insomnia, and sleep apnea who is noncompliant with CPAP presented after a fall associated with altered mental status. He has taken zolpidem 10 mg nightly for over six years. The patient and wife reported notable personality changes beginning six months prior, as well as four months of progressively worsening auditory and visual hallucinations. Additionally, the patient noted developing urinary incontinence, and worsening gait steadiness with recurrent falls. The patient then developed sleep-wake inversion during the three weeks prior to his fall, and an outpatient referral to neurology was subsequently sent for dementia evaluation. On the night prior to his presentation, the patient took his usual nighttime zolpidem at 22:00 and later fell and was unable to get up. Subsequent testing was negative for reversible causes of dementia and MRI Brain revealed only chronic microvascular disease. His zolpidem dose was decreased to 5 mg and scheduled earlier which resulted in the resolution of his hallucinations, gait abnormalities, and acute encephalopathy. Conclusion One month later, the patient presented to the hospital after a repeat fall secondary to taking his zolpidem at his previously scheduled time. Once more, his dosage was further decreased to 2.5 mg and scheduling earlier, resulting again, in the complete resolution of his symptoms. Zolpidem, has an increased potential for delirium in elderly patients and especially those with dementia. Chronic use of zolpidem with insidiously progressive vascular dementia led to a worsening delirium which resolved after adjustment of timing and reduction of zolpidem dosing. Support (if any):