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Ventricular fibrillation is a type of arrhythmia, or irregular heartbeat, that affects your heart's ventricles.

An AED is a small, portable, battery-powered machine with a computer in it. The machine detects heart activity. It can give an electric shock to someone if needed.

Rathke cleft cysts are noncancerous fluid-filled growths that develop between the parts of the pituitary gland at the base of the brain. They develop while a baby is growing in the uterus. A Rathke cleft cyst develops from a piece of the fetus' developing Rathke pouch, which ultimately becomes part of the pituitary gland.

The biggest problem with palliative care is that many people are referred for care too late. By starting this type of care early, and by using the right type of pain management, nearly all pain problems can be relieved or reduced.

Patient-controlled analgesia (PCA) is a type of pain management that allows you to decide when you will get a dose of pain medicine. You don't need to wait for a nurse, and you can get smaller doses of pain medicine more often.

Insomnia is trouble falling to sleep or staying asleep. One in three adults has bouts of insomnia.

Swallowing difficulties can happen for reasons ranging from dehydration to illness. Most cases are short-lived, but sometimes you might need medical treatment or special home care.

Wolff-Parkinson-White syndrome (WPW) is a type of abnormal heartbeat. If you have WPW, you may have episodes of tachycardia, when your heart beats very rapidly

Long QT syndrome can cause life-threatening rapid heart rhythms that can lead to fainting or sudden death.