Global cerebral dysfunction characterised by alteration in cognitive function and consciousness is known as
**Core Concept**
Global cerebral dysfunction refers to a diffuse impairment of brain function, affecting cognitive processes and consciousness. This condition arises due to widespread disruption of neural circuits, often resulting from systemic or diffuse pathologies.
**Why the Correct Answer is Right**
The correct answer is Delirium. Delirium is characterized by acute onset of fluctuating cognitive disturbances, including disorientation, altered level of consciousness, and impaired attention. This condition is often precipitated by severe systemic illness, medication effects, or metabolic disturbances. The pathophysiology of delirium involves disruption of normal neurotransmitter balance, particularly cholinergic and dopaminergic systems, which regulate attention and cognitive processing.
**Why Each Wrong Option is Incorrect**
**Option A:** Coma - While coma involves a disturbance of consciousness, it is a more profound and persistent state of unresponsiveness, often with a fixed and non-fluctuating level of consciousness.
**Option B:** Dementia - Dementia is a chronic condition characterized by progressive cognitive decline, often with a more gradual onset and less fluctuating course than delirium.
**Option C:** Encephalopathy - Encephalopathy refers to a diffuse brain dysfunction, but it is a broader term that encompasses a range of conditions, including delirium, but also other conditions like hepatic encephalopathy or metabolic encephalopathy.
**Clinical Pearl / High-Yield Fact**
Delirium is often remembered by the "CAM" factors: **C**hronic medical conditions, **A**cute medication effects, and **M**etabolic disturbances. These factors can precipitate delirium in vulnerable patients.
**Correct Answer: A. Coma is incorrect. Delirium is a more appropriate answer as it is characterized by fluctuating cognitive disturbances and altered level of consciousness.**