paroxysmal supraventricular tachycardia


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Related to paroxysmal supraventricular tachycardia: Paroxysmal Atrial Tachycardia

tachycardia

 [tak″e-kahr´de-ah]
abnormally rapid heart rate, usually taken to be over 100 beats per minute. adj., adj tachycar´diac.
A, Sinus tachycardia; B, Ventricular tachycardia. From Chernecky, 2001.
antidromic circus movement tachycardia a supraventricular tachycardia supported by a reentry circuit that uses the atrioventricular node in the retrograde direction and an accessory pathway in the anterograde direction; this produces a broad QRS rhythm indistinguishable from ventricular tachycardia. Such a tachycardia may also use two accessory pathways (one anterograde and one retrograde) and not involve the AV node at all.
atrial tachycardia a rapid heart rate, between 140 and 250 beats per minute, with the ectopic focus in the atria and with no participation by the atrioventricular node or the sinoatrial node. It is recognizable on the electrocardiogram because the P wave precedes the QRS complex, as opposed to being merged with it or following it. This condition is usually associated with atrioventricular block or digitalis toxicity.
benign ventricular tachycardia tachycardia originating in the ventricles, not associated with structural heart disease or significant hemodynamic symptoms.
bidirectional ventricular tachycardia (bifascicular ventricular tachycardia) a ventricular arrhythmia characterized by heart rates of 90 to 160 beats per minute, alternating right and left axis deviation, ectopic focus that alternates between the anterior superior and posterior inferior fascicles, and a right bundle branch block pattern in lead V1; seen in digitalis toxicity and other conditions.
chaotic atrial tachycardia an ectopic atrial tachycardia due to multifocal activity, characterized by at least three different shapes of P waves on the electrocardiogram; often associated with chronic obstructive lung disease.
circus movement tachycardia (CMT) a reentry circuit that uses an accessory pathway or pathways; there are two subtypes, antidromic and orthodromic circus movement tachycardia.
ectopic tachycardia rapid heart action in response to impulses arising outside the sinoatrial node.
junctional tachycardia rhythm at the rate of 100 to 140 beats per minute that arises in response to impulses originating in the atrioventricular junction, i.e., the atrioventricular node. It is often seen with digitalis toxicity and is due to triggered activity, but it may also be due to altered automaticity. In the case of digitalis toxicity, the term may be used to encompass the entire span of junctional rates with this condition, i.e., approximately 70 to 140 beats per minute.
monomorphic ventricular tachycardia a type that has a uniform beat-to-beat QRS morphology.
nonsustained ventricular tachycardia a type that terminates spontaneously within 30 seconds and does not lead to hemodynamic collapse.
orthodromic circus movement tachycardia a supraventricular tachycardia supported by a reentry circuit that uses the atrioventricular node in the anterograde direction and an accessory pathway in the retrograde direction, producing a narrow QRS complex.
orthostatic tachycardia disproportionate rapidity of the heart rate on arising from a reclining to a standing position.
paroxysmal tachycardia rapid heart action that starts and stops abruptly.
paroxysmal atrial tachycardia paroxysmal supraventricular tachycardia.
paroxysmal supraventricular tachycardia (PSVT) a narrow QRS tachycardia that begins and ends abruptly; it may be terminated with a vagal maneuver. It has two common mechanisms, atrioventricular nodal reentry and circus movement that uses the atrioventricular node anterogradely and an accessory pathway retrogradely. On the electrocardiogram it is characterized by abrupt onset, and mechanisms are differentiated by the relation of the P wave to the QRS complex.
polymorphic ventricular tachycardia a type that has a constantly, and sometimes subtly, changing beat-to-beat QRS configuration.
potentially malignant ventricular tachycardia a type that is not associated with structural heart disease or hemodynamically important cardiac symptoms but is sometimes associated with left ventricular dysfunction.
sinus tachycardia (ST) a rapid rhythm originating in the sinoatrial node with a rate of usually 100 to 160 beats per minute; conduction through the ventricles is normal. During exercise or stress this is normal, but if it occurs during rest it is abnormal.
supraventricular tachycardia a combination of junctional tachycardia and atrial tachycardia.
sustained ventricular tachycardia tachycardia that lasts more than 30 seconds and leads to hemodynamic collapse.
ventricular tachycardia an abnormally rapid ventricular rhythm with aberrant ventricular excitation, characterized by at least three consecutive ventricular complexes of more than 100 beats per minute. It is generated within the ventricle and is most often associated with atrioventricular dissociation.

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.

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

paroxysmal supraventricular tachycardia

Abbreviation: PSVT
A sporadically occurring arrhythmia with an atrial rate that is usually 160 to 200 beats per minute. It originates above the bundle of His, and typically appears on the surface electrocardiogram as a rapid, narrow-complex tachycardia. This relatively common arrhythmia may revert to sinus rhythm with rest, sedation, vagal maneuvers, or drug therapy.
See also: tachycardia
References in periodicals archive ?
12] If paroxysmal supraventricular tachycardia occurs and the patient is hemodynamically stable then vagal maneuvers, lignocaine, adenosine can be tried.
and European countries because of its beneficially effects on heart rate control in artial fibrillation/flutter and stopping/preventing paroxysmal supraventricular tachycardia.
Mechanisms of paroxysmal supraventricular tachycardia.
Radiofrequency catheter ablation for paroxysmal supraventricular tachycardia in children and adolescents without structural heart disease.
15); no mention of adenosine or esmolol (Brevibloc) in the treatment of paroxysmal supraventricular tachycardia (p 47); no mention of magnesium infusion as treatment of torsade de pointes (p 51) nor a list (getting longer every day) of the drugs that cause it; no mention of cigarette smoking as an "allergen" in asthma (p 100); and no statement was made regarding the lack of efficacy of mineralocorticoid replacement in adrenal insufficiency, but it does appear in the section on secondary adrenal insufficiency, and causes confusion nonetheless (p 497).
The generic prescription drug, supplied in 5 and 10 mL vials, is used to treat irregular heartbeats (arrhythmias), including atrial fibrillation and paroxysmal supraventricular tachycardia.

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