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Heart Loop Recorder

  • Arrhythmia (Abnormal Heartbeat) Arrhythmia (Abnormal Heartbeat)

    An arrhythmia is an abnormal heartbeat usually caused by an electrical "short circuit" in the heart. Many are minor and not a health threat, but some can indicate a more serious problem.

  • Body Basics: The Heart (Slideshow)

    Learn how this amazing muscle pumps blood throughout the body.

  • Fainting Fainting

    Fainting is a temporary loss of consciousness. Someone who has fainted will usually recover quickly.

  • First Aid: Fainting First Aid: Fainting

    Fainting is a loss of consciousness that can be caused by many things. Here's what to do if your child faints or is about to faint.

  • Long QT Syndrome Long QT Syndrome

    Long QT syndrome (LQTS) is a condition that affects the electrical system of the heart. Some kids have no symptoms, while others may feel changes in their heartbeat or feel lightheaded.

  • Postural Orthostatic Tachycardia Syndrome (POTS) Postural Orthostatic Tachycardia Syndrome (POTS)

    Postural orthostatic tachycardia syndrome (POTS) happens when the autonomic nervous system — which controls things like heart rate, blood pressure, and breathing — doesn't work as it should.

  • Supraventricular Tachycardia (SVT) Supraventricular Tachycardia (SVT)

    Supraventricular tachycardia is a type of abnormal heart rhythm in which the heart beats very quickly.

  • Words to Know (Heart Glossary) Words to Know (Heart Glossary)

    A guide to medical terms about the heart and circulatory system. In an easy A-Z format, find definitions on heart defects, heart conditions, treatments, and more.

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