Definition

Subarachnoid hemorrhage is a type of stroke that occurs when a blood vessel ruptures. Blood quickly fills the area immediately surrounding the brain and spinal cord. This space contains the cerebrospinal fluid. The fluid cushions and bathes the brain and spinal cord.

This life-threatening condition requires emergency medical care. The hemorrhage may increase the pressure around the brain. It can interfere with the brain's ability to function.

Subarachnoid Hemorrhage

exh53858_97870_1_subarach hemo
Copyright © Nucleus Medical Media, Inc.

Causes

Subarachnoid hemorrhage may be caused by:

  • Head trauma
  • Rupture of cerebral aneurysms and other blood vessel deformities
  • Bleeding disorders
  • Drug use, especially with cocaine and amphetamines
  • Brain tumors

Risk Factors

Factors that may increase your chance of developing subarachnoid hemorrhage include:

Symptoms

Symptoms may include:

  • A very sudden, severe headache
  • Brief loss of consciousness
  • Seizures
  • Nausea and vomiting
  • Weakness on one side of your body
  • Unexplained numbness or tingling
  • Slurred speech or other speech disturbance
  • Visions problems, such as double vision, blind spots, or temporary vision loss on one side
  • Stiff neck or shoulder pain
  • Confusion

If you have these symptoms, call for emergency medical services right away. Early care can decrease the amount of damage to brain.

Diagnosis

Your doctor will ask about your symptoms and medical history. A physical exam will be done. Your cerebrospinal fluid may need to be tested. This can be done with a lumbar puncture.

Images may need to be taken of your internal body structures. This can be done with:

Treatment

Subarachnoid hemorrhage is a serious condition. It requires initial treatment in the intensive care unit. Despite treatment, many patients with this condition die.

The aim of treatment is to stop the bleeding, limit damage to the brain, and reduce the risk of it occurring again. If bleeding results from a cerebral aneurysm, a doctor will usually attempt to stop it using various techniques. Patients receive medication to ensure proper blood flow to the rest of the brain. Absolute bed rest is needed to prevent additional bleeding. After the situation is stabilized, patients undertake a vigorous rehabilitation program.

If you are diagnosed with a subarachnoid hemorrhage, follow your doctor's instructions .

Prevention

Aneurysms present since birth cannot be prevented. Because they are so rare, doctors do not advise screening for them. If an unruptured aneurysm is discovered by chance in a young person, the doctor may do surgery.

Avoiding smoking and controlling blood pressure can reduce the risk of a rupture if an aneurysm exists. Wearing a seatbelt and using a helmet can also reduce the risk of subarachnoid hemorrhage from head trauma.