Write-up by Peterhutch
Hydrocephalus can be defined broadly as a disturbance of formation, flow, or absorption of cerebrospinal fluid (CSF) that leads to an increase in volume occupied by this fluid in the central nervous system (CNS). This condition also could be termed a hydrodynamic disorder of CSF. Acute hydrocephalus occurs over days, subacute over weeks, and chronic over months or years. Conditions such as cerebral atrophy and focal destructive lesions also lead to an abnormal boost of CSF in CNS. In these situations, loss of cerebral tissue leaves a vacant space that is filled passively with CSF.
The ventricular program is produced up of four ventricles connected by narrow passages.. Normally, CSF flows by means of the ventricles, exits into cisterns (closed spaces that serve as reservoirs) at the base of the brain, bathes the surfaces of the brain and spinal cord, and then reabsorbs into the bloodstream. CSF has 3 crucial life-sustaining functions: 1) to maintain the brain tissue buoyant, acting as a cushion or "shock absorber" 2) to act as the vehicle for delivering nutrients to the brain and removing waste and three) to flow between the cranium and spine and compensate for changes in intracranial blood volume (the amount of blood inside the brain).
The causes of hydrocephalus are still not nicely understood. Hydrocephalus could result from inherited genetic abnormalities (such as the genetic defect that causes aqueductal stenosis) or developmental disorders (such as those associated with neural tube defects including spina bifida and encephalocele). Other feasible causes include complications of premature birth such as intraventricular hemorrhage, diseases such as meningitis, tumors, traumatic head injury, or subarachnoid hemorrhage, which block the exit of CSF from the ventricles to the cisterns or eliminate the passageway for CSF into the cisterns.
Symptoms of hydrocephalus vary with age, disease progression, and individual differences in tolerance to CSF. In infancy, the most obvious indication of hydrocephalus is often the rapid enhance in head circumstance or an unusually significant head size. In older young children and adults, symptoms could consist of headache followed by vomiting, nausea, papilledema (swelling of the optic disk, which is component of the optic nerve), downward deviation of the eyes (called "sunsetting"), issues with balance, poor coordination, gait disturbance, urinary incontinence, slowing or loss of development (in youngsters), lethargy, drowsiness, irritability, or other adjustments in personality or cognition, which includes memory loss.
Regular flow and absorption by way of the subarachnoid space is dependent on correct CSF pressure in the head (known as intracranial pressure). A build up of CSF usually causes a harmful enhance in pressure. The combination of CSF buildup and the subsequent improve in intracranial pressure can stress brain tissue and can cause the characteristic symptoms of hydrocephalus, though they also could occur with normal pressure.
Hydrocephalus produces diverse combinations of these signs and symptoms, depending on its cause, which also varies by age. For example, a condition identified as normal pressure hydrocephalus, which mainly affects older people, usually starts with difficulty walking. Urinary incontinence usually develops, along with a sort of dementia marked by slowness of thinking and data processing.
The most widespread treatment for hydrocephalus is the surgical insertion of a drainage program, called a shunt. It consists of a long flexible tube with a valve that keeps fluid from the brain flowing in the proper direction and at the proper rate. One end of the tubing is generally placed in one of the brain's ventricles.
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