How does pulse pressure change when ICP is increased?

When intracranial pressure (ICP) increases, pulse pressure widens. This occurs because the increased pressure within the skull can affect the dynamics of blood flow and the relationship between systolic and diastolic blood pressures. Normally, pulse pressure, which is the difference between systolic and diastolic blood pressure, is maintained at a relatively constant level. However, when ICP rises, the body responds by increasing stroke volume or cardiac output to maintain cerebral perfusion. This enhanced stroke output can lead to a greater systolic pressure if the heart pumps more forcefully, while diastolic pressure may not rise proportionately. As a result, the widening of pulse pressure reflects the body's attempts to accommodate and ensure adequate blood flow to the brain despite the elevated pressure.