Pseudodementia Case Study

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75 year old man with a history of diabetes, coronary artery disease, and COPD requiring nasal oxygen is brought to the clinic by his daughter. She reports that the patient has poor memory and has been getting worse over the past 2 years. She states that after he makes a statement or asks a question, he will repeat the statement or question again 15 or 20 minutes later. He can no longer manage his personal finances. The patient reports that his mood is good, and that he gets up occasionally to urinate throughout the night, but is able to get back to sleep quickly once he is done.. On office screening, he scores 18/30 on a mini-mental status test. On physical examination, he has bilateral crackles on lung auscultation and an accentuated …show more content…

This patient has Alzheimer disease. The diagnosis is based on 1) the history describing progressive episodic memory loss, 2) hippocampal atrophy on brain MRI, 3) functional impairment in cognition (patient is no longer able to handle his personal finances) and 4) absence of other reversible pathologies (normal TSH, vitamin B12 and RPR tests). This is not likely to be a depression causing memory loss (a.k.a. “pseudodementia”) since he does not report depressive symptoms, does not have neurovegetative signs, and does not have a positive testing on a depression inventory. The first-line therapy for this disorder is an acetylcholinesterase inhibitor, such as donepezil, galantamine or rivastigmine. These drugs block the breakdown of acetylcholine, which then leads to an increase in acetylcholine in the brain. Side effects of the drug are primarily related to the increase in acetylcholine that are found outside of the brain. Common side effects are related to hyperactivity of the parasympathetic system (nausea, diarrhea, syncope, bronchospasm), neuromuscular transmission (muscle cramps) or other CNS complications (vivid dreams). Because this patient has severe COPD (evidenced by the oxygen requirement, abnormal breath and heart sounds), cholinesterase inhibitors are contraindicated. Therefore the second line agent, memantine, should be used. Memantine works, in part, by blocking NMDA receptors. The side effects of this drug are primarily …show more content…

Donepezil is a cholinesterase inhibitor, and therefore may potentiate the effects of the parasympathetic nervous system. Bronchospasm is a potential complication, and therefore this drug is contraindicated in patients with COPD. Choice "B" is not the best answer. Galantamine is a cholinesterase inhibitor, and therefore may potentiate the effects of the parasympathetic nervous system. Bronchospasm is a potential complication, and therefore this drug is contraindicated in patients with COPD. Choice "C" is not the best answer. Levodopa is the first line agent (along with carbidopa) for Parkinson disease, not Alzheimer disease. Choice "E" is not the best answer. Rivastigmine is a cholinesterase inhibitor, and therefore may potentiate the effects of the parasympathetic nervous system. Bronchospasm is a potential complication, and therefore this drug is contraindicated in patients with COPD. Note that rivastigmine has been formulated into a patch. The patch form has very stable pharmacokinetics, limiting peak-dose effects, and therefore may be useful for patients with gastrointestinal upset (which is related to peak drug levels) on other cholinesterase

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