Which of the following describes genu varum?

Choice A reason: Loss of short-term memory is a hallmark of Alzheimer’s disease, as seen in the patient’s difficulty recalling recent events. This reflects early hippocampal damage, impairing new memory formation, making it a correct clinical manifestation for this diagnosis.

Choice B reason: Alzheimer’s disease is the most likely diagnosis, given progressive memory loss, word-finding difficulties, and an MMSE score of 20/30 in a 65-year-old. These symptoms align with Alzheimer’s neurodegenerative pattern, making this the correct diagnosis.

Choice C reason: Vascular dementia typically presents with stepwise cognitive decline and focal neurological signs, often with vascular risk factors. The patient’s gradual memory loss without such history better fits Alzheimer’s, making vascular dementia incorrect.

Choice D reason: Word-finding difficulties, as exhibited, are a hallmark of Alzheimer’s, reflecting language cortex involvement. This progressive aphasia, common in early stages, impairs communication, making it a correct clinical manifestation for this patient.

Choice E reason: Disorientation to time and place, though not explicitly stated, is a hallmark of Alzheimer’s, often emerging as memory declines. Given the patient’s MMSE score and symptoms, this is likely, making it a correct manifestation.

Choice A reason: Increased glucose use doesn’t occur in DKA; insulin deficiency reduces glucose uptake. Fluid shifts are due to osmotic diuresis, not intravascular to intracellular movement, so this is incorrect for DKA’s mechanism.

Choice B reason: DKA involves metabolic, not respiratory, acidosis from ketones. Protein catabolism occurs, but fatty acid use and ketogenesis are primary, leading to acidosis and diuresis, so this is incorrect.

Choice C reason: Increased glucose and fatty acids contribute, but the mechanism is decreased glucose use causing ketogenesis. This option omits ketogenesis, a key DKA feature, so it’s less precise and incorrect.

Choice D reason: Insulin deficiency in DKA reduces glucose use, leading to fatty acid breakdown, ketogenesis, metabolic acidosis (pH 7.2), and osmotic diuresis (electrolyte loss). This fully explains the lab values, making it correct.