All the following are organic brain disorders except?

IGNOU Post B. SC. Nursing entrance -2021

Mental Health Nursing

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Appeared in: IGNOU Post B. SC. Nursing entrance -2021

Explanation

Mental retardation, now known as Intellectual Disability (ID), is classified as a neurodevelopmental disorder, not an organic brain disorder.
Its onset is during the developmental period (before age 18) and is characterized by significant limitations in both intellectual functioning and adaptive behavior.
Unlike organic disorders, it is not an acquired condition representing a decline from a previous level of functioning, but rather a condition of sub-optimal development.

Option A: Amnestic disorder is a classic organic brain disorder. It involves an acquired impairment in memory due to a direct physiological cause, such as a medical condition, brain injury, or substance use, representing a decline from a previous functional level.
Option B: Dementia is a primary example of an organic brain disorder. It is characterized by a progressive, acquired decline in multiple cognitive areas, including memory, language, and executive function, due to underlying brain pathology.
Option C: Delirium is an acute organic brain syndrome. It is defined by a disturbance in attention, awareness, and cognition that develops over a short period and is a direct physiological consequence of another medical condition, substance intoxication or withdrawal.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of mental disorders, distinguishing between acquired neurocognitive disorders and neurodevelopmental disorders as background academic context rather than a clinical decision trigger.
It is crucial for nurses to distinguish between an acute change in mental status (like delirium) and a chronic developmental condition (like intellectual disability) as the assessment, management, and communication strategies are vastly different.
Management for delirium focuses on identifying and treating the underlying acute medical cause, ensuring patient safety, and managing symptoms. In contrast, care for a person with intellectual disability focuses on long-term support, education, and maximizing adaptive functioning in a stable environment.
What if? If a patient with a known history of intellectual disability suddenly becomes confused, agitated, and inattentive, the nurse must not attribute this to their baseline condition. This presentation strongly suggests a superimposed delirium, requiring an urgent investigation for an underlying medical illness, infection, or medication side effect.

How to Approach the Question

First, recognize that the question uses the word 'except'. This means you are looking for the option that does not belong to the specified category.
Next, define the category: 'organic brain disorders'. Recall that this term refers to acquired conditions that cause a decline in cognitive function due to a physiological cause.
Systematically evaluate each option against this definition.
Amnestic disorder, dementia, and delirium all fit the definition of an acquired cognitive decline.
Consider 'Mental retardation'. Recall that this is a condition of impaired intellectual and adaptive functioning with an onset during the developmental period (childhood). It is not an acquired decline.
Conclude that Mental Retardation is the exception and therefore the correct answer.

Concept Tested & Keywords

Concept Tested: Classification of mental disorders, distinguishing between acquired neurocognitive disorders and neurodevelopmental disorders.
Stem keywords: organic brain disorders
Lead-in keywords: except
Negative lead-in flag: The question asks for the option that does NOT belong to the group of organic brain disorders.

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E6 Guide to Mental Health & PSYCHIATRIC NURSING R Sreevani— Part 2 (pp 290-564 of 579) pp. 78-80, 66-68