Welcome to our Tachycardia Reference Page. This page provides a summary definition followed by introductions to our practice drills, quizzes, lessons and interactive guides.
Tachycardia is a rapid, above normal, heart rate when the subject is at rest. A resting heart rate that exceeds one hundred beats per minute can be classified as tachycardia.
Tachycardias can be classified by their origin (atria or ventricles).
Ventricular tachycardia originates in the ventricles and includes the follow abnormalities:
- Ventricular fibrillation is a rapid and chaotic cardiac rhythm. The ventricles quiver rather than pump, which diminished blood pressure and flow. Ventricular fibrillation demands immediate emergency medical attention.
- Long QT syndrome is an abnormal EKG pattern that reflects disorder of the heart's electrical signals resulting in fast and chaotic heartbeats. During exercise or stress, long QT syndrome can cause dangerous arrhythmias.
- Premature ventricular contractions are abnormal (and extra) heartbeats that originate in the ventricles. This abnormality is also called PVC or Premature Ventricular Complex. It is fairly common abnormality.
Supraventricular tachycardias originate above the ventricles. They include:
- Atrial flutter, a rapid heart beat, but not as chaotic as atrial fibrillation.
- Supraventricular tachycardia, originating above the ventricles, it can last for seconds to hours. Several types of supraventricular tachycardia can be diagnosed.
- Atrial fibrillation, which is a chaotic, fast heart rhythm. Fairly common. Risk of developing atrial fibrillation increases with age.
- Wolff-Parkinson-White syndrome, which occurs when a second electrical pathway between atria and ventricles bypasses the atrioventricular node.
Diagnosis - Overview
Several types of tests may be employed to diagnose tachycardia: electrocardiograms,
holter monitors, event monitors, stress tests, echocardiograms, electrophysiology studies, head-up-tilt-table tests and cardiac catheterization. On this website you will find provide tools for heart sounds and electrocardiograms.
If you wish to practice taking pulse rate, use our blood pressure case studies.
Using the play button on the torso, you can listen to tachycardia. For more
information, lessons and quizzes for heart sounds, visit our page: