Examples of intracranial pressure in the following topics:
- Too much blood can raise intracranial pressure (ICP), which can compress and damage delicate brain tissue.
- A brain tumor is an intracranial solid neoplasm—a tumor (defined as an abnormal growth of cells)—within the brain or the central spinal canal.
- Consequences of intracranial hypertension: Large tumors or tumors with extensive perifocal swelling (edema) inevitably lead to elevated intracranial pressure (intracranial hypertension), which translates clinically into headaches, vomiting (sometimes without nausea), altered state of consciousness (somnolence, coma), dilation of the pupil on the side of the lesion (anisocoria), papilledema (prominent optic disc at the funduscopic eye examination).
- In any age group, subarachnoid hemorrhage, hydrocephalus, benign intracranial hypertension, and many other conditions may be diagnosed with this test.
- The opening pressure of the cerebrospinal fluid may also be recorded during the procedure.
- Finally, the needle is withdrawn and pressure is placed on the puncture site for a few minutes.
- Increased CSF pressure: can indicate conditions causing increased intracranial pressure, such as congestive heart failure, cerebral edema, subarachnoid hemorrhage, meningeal inflammation, purulent meningitis or tuberculous meningitis, hydrocephalus, or pseudotumor cerebri.
- Decreased CSF pressure: can indicate complete subarachnoid blockage, leakage of spinal fluid, severe dehydration, hyperosmolality, or circulatory collapse.
- This decreases total intracranial pressure and facilitates blood perfusion.
- When CSF pressure is
elevated, cerebral blood flow may be constricted.
- When disorders of CSF flow
occur, they may therefore affect not only CSF movement but also craniospinal
compliance and the intracranial blood flow, with subsequent neuronal and glial
- It may present as a specific response to ailments like gastritis or poisoning, or as a non-specific symptom of disorders ranging from brain tumors and elevated intracranial pressure to overexposure to ionizing radiation.
- In the next phase, also termed the expulsive phase, intense pressure is formed in the stomach brought about by enormous shifts in both the diaphragm and the abdomen.
- The pressure is then suddenly released when the upper esophageal sphincter relaxes resulting in the expulsion of gastric contents.
- The relief of pressure and the release of endorphins into the bloodstream after the expulsion cause the patient to feel better after vomiting.
- An example of a specific type of neurological test is a monofilament test which evaluates fine touch by applying pressure to the skin with a set of nylon filaments.
- Intracranial pressure is roughly estimated by fundoscopy; this also enables assessment for microvascular disease.
- A strabismus may be a sign of increased intracranial pressure, as CN VI is particularly vulnerable to damage from brain swelling, as it runs between the clivus and brain stem.
- It is the inner hair cells of the organ of Corti that are responsible for activation of afferent receptors in response to pressure waves reaching the basilar membrane through the transduction of sound.
- A benign
primary intracranial tumor of vestibulocochlear nerve is called a
vestibular schwannoma (also called acoustic neuroma).
- Maxillary: can cause pain or pressure in the maxillary (cheek) area (e.g., toothache, headache) .
- Frontal: can cause pain or pressure in the frontal sinus cavity (located above eyes), or a headache.
- Ethmoid: can cause pain or pressure pain between/behind the eyes and headaches.
- Sphenoid: can cause pain or pressure behind the eyes, but often refers to the vertex, or top of the head.
- Continuous monitoring of patients for possible intracranial complication is advised.
- Traumatic brain injury (TBI), also known as intracranial injury, occurs when an external force traumatically injures the brain.
- These processes, which include alterations in cerebral blood flow and the pressure within the skull, contribute substantially to the damage from the initial injury.
- Lying still for long periods can cause complications including pressure sores, pneumonia or other infections, progressive multiple organ failure, and deep venous thrombosis, which can cause pulmonary embolism.