Supraventricular tachycardia (SVT) is an abnormal heart rhythm arising from improper electrical activity of the heart. It is a type of rapid heart rhythm originating at or above the atrioventricular node. It can be contrasted with the potentially more dangerousventricular tachycardias—rapid rhythms that originate within the ventricular tissue.
Although SVT can be due to any supraventricular cause, the term usually refers to a specific example, paroxysmal supraventricular tachycardia (PSVT), two common types being atrioventricular reentrant tachycardia and AV nodal reentrant tachycardia. In the older population atrial fibrillation becomes a common type of supraventricular arrhythmias—though it is typically considered separately.
In general, SVT is caused by one of two mechanisms: re-entry and automaticity. Re-entry (such as AV nodal reentrant tachycardia and atrioventricular reciprocating tachycardia) often presents with an almost immediate increase in heart rate. Someone experiencing this type of PSVT may feel the heart rate accelerate from 60 to 200 beats per minute or more. Typically, it reverts to normal just as suddenly.
In "automaticity" types of SVT (atrial tachycardia, junctional ectopic tachycardia), there is more typically a gradual increase and decrease in the heart rate. These are due to an area in the heart that generates its own electrical signal.
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http://www.aafp.org/afp/2010/1015/p942.html common types of supraventricular tachycardia: diagnosis and management by randall a. colucci, do, mph, ohio university college of osteopathic medicine, athens, ohio mitchell j. silver, do, mcconnell heart hospital, columbus, ohio jay shubrook, do, ohio university college of osteopathic medicine, athens, ohio am fam physician. 2010 oct 15;82(8):942-952.
meissner a, stifoudi i, weismüller p, schrage mo, maagh p, christ m, butz t, trappe hj, plehn g. sustained high quality of life in a 5-year long term follow-up after successful ablation for supra-ventricular tachycardia. results from a large retrospective patient cohort. int j med sci 2009; 6(1):28-36. doi:10.7150/ijms.6.28. available from http://www.medsci.org/v06p0028.htm
http://www.scopemed.org/fulltextpdf.php?mno=174994 arrhythmogenic right ventricular dysplasia: a rare case report from tribal zone of central india by prakash khunte, pradeep beck, bajrang basal int j res med sci. 2015 apr;3(4):1025-1029 doi: 10.5455/2320-6012.ijrms20150445
http://content.onlinejacc.org/article.aspx?articleid=2443667 2015 acc/aha/hrs guideline for the management of adult patients with supraventricular tachycardiaa report of the american college of cardiology/american heart association task force on clinical practice guidelines and the heart rhythm society by richard l. page, md, facc, faha, fhrs et al., j am coll cardiol. 2016;67(13):e27-e115. doi:10.1016/j.jacc.2015.08.856