When does ICP increase?

Increased intracranial pressure (ICP) occurs when anything unusual occupies space within the cranial cavity. The cranium is a rigid structure that contains the brain, blood, and cerebrospinal fluid (CSF). When the volume of any of these components increases, such as due to a tumor, hemorrhage, or swelling from injury, it can lead to increased pressure as there is limited space for expansion. This creates a situation where the overall pressure inside the cranium rises, which is a crucial point in understanding conditions such as traumatic brain injuries or space-occupying lesions. Recognizing that external volumes can lead to changes in ICP is vital for assessing and managing patients with neurological concerns.