What are the two necessary conditions for a diagnosis of substance-induced dementia?

For a diagnosis of substance-induced dementia, it is crucial to establish that there is evidence of sustained substance abuse, which indicates a prolonged and significant impact on cognitive functioning. This sustained abuse leads to cognitive deficits that are pronounced enough to impair daily functioning and manifest as dementia.

The second necessary condition involves eliminating other potential medical causes of dementia-like symptoms, such as neurodegenerative diseases or untreated medical conditions that may mimic dementia. This rigorous diagnostic process ensures that the cognitive impairment is indeed attributable to the effects of substance abuse rather than other underlying health issues.

The combination of sustained substance use and ruling out alternative medical explanations is essential for accurately diagnosing substance-induced dementia, which makes this answer the most appropriate choice in this context.