Supraventricular tachycardia

Supraventricular tachycardia (SVT) is an abnormally fast heart rhythm caused from improper electrical activity in the upper part of the heart.^[1]

There are four main types: atrial fibrillation, paroxysmal supraventricular tachycardia (PSVT), atrial flutter, and Wolff–Parkinson–White syndrome.

Symptoms may include palpitations, feeling faint, sweating, shortness of breath, or chest pain.^[2]

Supraventricular Tachycardia Media

Mechanisms of supraventricular tachycardias
Holter monitor-Imaging with start (red arrow) and end (blue arrow) of a SV-tachycardia with a pulse frequency of about 128/min.
A 12-lead ECG showing paroxysmal supraventricular tachycardia at about 180 beats per minute.
Atrial fibrillation: Red dots show atrial fibrillation activity.
Impulse arising in SA node, traversing atria to AV node, then entering ventricle. Rhythm originating at or above AV node constitutes SVT.
Atrial fibrillation: Irregular impulses reaching AV node, only some being transmitted.

References

↑ "Types of Arrhythmia". NHLBI. July 1, 2011. Archived from the original on June 7, 2015.
↑ "What Are the Signs and Symptoms of an Arrhythmia?". NHLBI. July 1, 2011. Archived from the original on 19 February 2015. Retrieved 27 September 2016.

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[NIH2011Type-1] "Types of Arrhythmia". NHLBI. July 1, 2011. Archived from the original on June 7, 2015.

[NIH2011Sym-2] "What Are the Signs and Symptoms of an Arrhythmia?". NHLBI. July 1, 2011. Archived from the original on 19 February 2015. Retrieved 27 September 2016.

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