Increased ICT is characterised by AIE-a) Headache and vomiting b) Intellectual changec) Tremorsd) Papilloedemae) Tachycardia

**Core Concept**
Increased intracranial pressure (ICT) is a critical clinical condition that can result from various causes such as head trauma, tumors, or hemorrhage. The body's response to increased pressure within the skull can lead to a range of symptoms, including those related to the central nervous system.

**Why the Correct Answer is Right**
The correct answer is Papilloedema, which is a clinical sign of increased ICT. Papilloedema is characterized by swelling of the optic disc due to compression of the optic nerve by the increased pressure. This occurs because the brain's ability to adapt to increased pressure by increasing the cerebrospinal fluid (CSF) production is limited, and eventually, the pressure exerted on the optic nerve leads to its swelling. The increased pressure in the brain can also lead to other symptoms such as headache and vomiting, but these are non-specific and can be seen in various conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** Headache and vomiting are symptoms of increased ICT but are not pathognomonic and can be seen in various other conditions. While headache and vomiting are common presenting symptoms in patients with increased ICT, they are not as specific as papilloedema.

**Option B:** Intellectual changes can occur in patients with increased ICT, but they are not as specific as papilloedema. Intellectual changes can be seen in various conditions and are not a direct result of increased ICT.

**Option C:** Tremors are not a direct result of increased ICT. While tremors can be seen in patients with increased ICT, they are not as specific as papilloedema.

**Option E:** Tachycardia is a non-specific symptom that can be seen in various conditions. While tachycardia can be seen in patients with increased ICT, it is not a specific sign of this condition.

**Clinical Pearl / High-Yield Fact**
Papilloedema is a specific sign of increased ICT and should prompt further investigation to determine the underlying cause. It is essential to differentiate papilloedema from other conditions that can cause disc swelling, such as optic neuritis.

**Correct Answer: D. Papilloedema**