Overview
IdiopathicThe term idiopathic is used when there is no detectable reason for something. Click the term to read more intracranial hypertension (IIH) is a disorder of elevated pressure within the brain without an identifiable cause. This increased pressure can lead to permanent damage to the brain and eyesight if left untreated. The term idiopathic is used when there is no detectable reason for increased pressure within the brain. However, as researchers continue to investigate potential causes, the term “idiopathic” may become a term of the past.¹
IIH is most commonly seen in overweight women in their reproductive years, usually in the 3rd and 4th decades of life. In the United States, approximately 19 per 100,000 women in this group are diagnosed with IIH.² With increasing rates of obesity in the US, defined as a body mass indexA value derived from the mass (weight) and height of a person. A healthy range is between 18.5-24.9, overweight is defined as 25-29.9 and obese… Click the term to read more (BMIA value derived from the mass (weight) and height of a person. A healthy range is between 18.5-24.9, overweight is defined as 25-29.9 and obese… Click the term to read more) of 30 or greater, the number of people affected by this syndrome is projected to increase.
The most common signs and symptoms of IIH are: headaches, dizziness, nausea, vision loss, and double vision.³ PapilledemaSwelling of the optic nerve that carries visual signals from the eye to the brain. Click the term to read more – swelling of the optic nerve that carries visual signals from the eye to the brain – is a common finding during a visual exam in one with IIH. As swelling of the optic nerve persists, vision worsens and can progress to blindness which can be permanent.
Signs & Symptoms
Other signs and symptoms of IIH may include: radicular pain, sixth nerve palsy, and pulse synchronous tinnitus.³ Radicular pain is hypothesized to be an effect of increased cerebrospinal fluidFluid that is made by specialized cells in the ventricles of the brain. Click the term to read more pressure, compressing nerves in the arms and legs causing the sensation of pins and needles. Sixth nerve palsy is the weakening of the lateral rectus muscle of the eye and can lead to double vision. Pulse synchronous tinnitus is the humming, whooshing, whistling, or marching noise that can be heard in one or both ears that is in sync with their own pulse.
Diagnosis
The diagnosis of IIH requires a detailed neurological history, complete physical, a visual exam (conventionally with an ophthalmologistA specialist in the branch of medicine concerned with the study and treatment of disorders and diseases of the eye. Click the term to read more), lumbar punctureA procedure where a needle is placed in the lower part of the spine (the lumbar spine) to access cerebrospinal fluid. Click the term to read more, and imaging studies to diagnose this condition. If signs and symptoms are related to increased pressure within the brain, a lumbar puncture yields normal cerebrospinal fluid results and elevated opening pressure, and imaging studies of the brain do not show an identifiable reason for increased intracranial pressure, then IIH is suspected.
