What does the medical abbreviation ICP mean?

Answer 1

ICP is an abbreviation for the term intracranial pressure meaning pressure within the cranial cavity (the skull).

Another Answer:

The intracranial pressure, or ICP, is the pressure inside the skull. This is one of the medical terms heard often in the treatment of patients with head trauma. Because the space inside the bony skull is fixed, any increase in mass within the skull will increase this pressure. This can be due to several things including a mass inside the head (such as a brain tumor or a hemorrhage/hematoma), swelling of the brain due to traumatic injury or infarction, and hydrocephalus. Generally, as the pressure increases the brain does not function as well, leading to neurological symptoms. Very high intracranial pressures can cause coma or death. Patients with disorders that lead to high pressure are often monitored with some form of intracranial pressure monitor, such as a ventriculostomy, to record the pressure. Several treatments can be then used to help lower the pressure to protect the brain.