paroxysmal supraventricular tachycardia

tachycardia /tachy·car·dia/ (-kahr´de-ah) abnormally rapid heart rate.tachycar´diac

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atrial tachycardia  a rapid cardiac rate, usually 160–190 per minute, originating from an atrial locus.

atrioventricular (AV) junctional tachycardia , atrioventricular (AV) nodal tachycardia junctional t.

atrioventricular nodal reentrant tachycardia  that resulting from reentry in or around the atrioventricular node; it may be antidromic, in which conduction is anterograde over the accessory pathway and retrograde over the normal conduction pathway or orthodromic, in which conduction is anterograde over the normal conduction pathway and retrograde over the accessory pathway.

atrioventricular reciprocating tachycardia  (AVRT) a reentrant tachycardia in which the reentrant circuit contains both the normal conduction pathway and an accessory pathway as integral parts.

chaotic atrial tachycardia  that characterized by atrial rates of 100 to 130 beats per minute, markedly variable P wave morphology, and irregular P–P intervals, often leading to atrial fibrillation.

circus movement tachycardia  reentrant t.

ectopic tachycardia  rapid heart action in response to impulses arising outside the sinoatrial node.

junctional tachycardia  that arising in response to impulses originating in the atrioventricular junction, i.e., in the atrioventricular node, with a heart rate greater than 75 beats per minute.

multifocal atrial tachycardia  (MAT) chaotic atrial t.

nonparoxysmal junctional tachycardia  a junctional tachycardia of slow onset, with a heart rate of 70 to 130 beats per minute; due to enhanced automaticity of the atrioventricular junctional tissue, often secondary to disease or trauma.

paroxysmal tachycardia  rapid heart action that starts and stops abruptly.

paroxysmal supraventricular tachycardia  (PSVT) supraventricular tachycardia occurring in attacks of rapid onset and cessation, usually due to a reentrant circuit.

reciprocating tachycardia  a tachycardia due to a reentrant mechanism and characterized by a reciprocating rhythm.

reentrant tachycardia  any tachycardia characterized by a reentrant circuit.

sinus tachycardia  (ST) tachycardia originating in the sinus node; normal during exercise or anxiety but also associated with shock, hypotension, hypoxia, congestive heart failure, fever, and various high output states.

supraventricular tachycardia  (SVT) any regular tachycardia in which the point of stimulation is above the bundle branches; it may also include those arising from large reentrant circuits that encompass both atrial and ventricular sites.

ventricular tachycardia  an abnormally rapid ventricular rhythm with aberrant ventricular excitation, usually above 150 beats per minute, generated within the ventricle, and most often associated with atrioventricular dissociation.

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paroxysmal supraventricular tachycardia,

an ectopic heart rhythm with a rate of 170 to 250 beats/min. It begins abruptly with a premature atrial or ventricular beat and is supported by an atrioventricular (AV) nodal reentry mechanism or by an AV reentry mechanism involving an accessory pathway. Formerly called paroxysmal atrial tachycardia, paroxysmal junctional tachycardia.

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paroxysmal supraventricular tachycardia

Supraventricular tachycardia Cardiology Tachycardia triggered sporadically in the myocardium above the ventricles; PSVT is most common in younger subjects with normal hearts Risk factors Smoking, caffeine, stress, alcohol abuse, overactive thyroid, excess thyroid hormone intake, drugs–eg, digitalis; PSVT can be a form of a re-entry tachycardia, resembling Wolff-Parkinson-White syndrome