What are the earliest signs of increased intracranial pressure?

• A. Cushing's triad
• B. Vomiting
• C. Dilated pupil with sluggish response
• D. Decreasing level of consciousness

Answer: (D)

Rising intracranial pressure first impairs the brain’s ability to stay awake and respond, so changes in level of consciousness appear before other signs. The brain’s arousal system, located in the brainstem (the reticular activating system), is sensitive to perfusion changes caused by increased pressure. As ICP climbs, you’ll typically see the patient become confused, restless, drowsy, or have difficulty waking—early indicators that something is wrong with intracranial dynamics.

Vomiting is common with increased ICP and can occur early, but it isn’t as reliable an early marker as altered consciousness. Dilated pupils with a sluggish response indicate more focal brain involvement (often pointing to midbrain compression) and tend to occur later as pressure increases. Cushing’s triad (high blood pressure with wide pulse pressure, bradycardia, and irregular respirations) is a late sign, signaling impending herniation and deterioration. So the earliest, most sensitive sign among these is the decrease in level of consciousness.