atrial tachycardia


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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.

a·tri·al tach·y·car·di·a

paroxysmal tachycardia originating in an ectopic focus in the atrium.

atrial tachycardia

Cardiology Tachycardia triggered by a focus in the atrium, which beats at 160 to 190 bpm. See Atrial fibrillation, Atrial flutter.

a·tri·al tach·y·car·dia

(AT) (ātrē-ăl tak-i-kahrdē-ă)
Paroxysmal tachycardia originating in an ectopic focus in the atrium.
References in periodicals archive ?
Results of success frequency for different types of arrhythmia in their study were as: AVNRT 98% (130/132), AVRT 91% (97/106), typical atrial flutter 99% (129/130) and for atrial tachycardia 86% (18/21).15 Results of success frequency for different types of arrhythmia in our study included AVNRT 100% (28/28), AVRT 100% (17/17), and for atrial tachycardia 75% (3/4).
A superior-to-inferior axis of P waves (positivity in leads II, III, and aVF) is seen in sinus node-generated tachycardias and sometimes in focal atrial tachycardia. An inferior-superior P wave axis (negativity in leads II, III, and aVF) is observed in AVNRT, AVRT, and a subset of focal atrial tachycardia.
Whenever the ventricular rate appears to be lower than anticipated in a postoperative patient, it is important to exclude atrial tachycardias with 2:1 AV block, in which alternate P waves may be difficult to identify.
An atrial tachycardia was diagnosed and she was initially cardioverted electrically and treated with beta blockers, but the symptoms returned.
Such was the case with our patient who developed episodes of atrial fibrillation, sinus arrhythmia, and multifocal atrial tachycardia.
Adenosineinsensitive focal atrial tachycardia: Evidence for de novo micro-reentry in the human atrium.
DIAGNOSIS: Multifocal atrial tachycardia; right bundle branch block.
(11.) Wagshal AB, Applebaum A, Crystal P et al: Atrial tachycardia as the presenting sign of left atrial appendage aneurysm: Pacing Clinelectrophysiol 2000:23:283-285.
The incidence of multifocal atrial tachycardia (MAT) in infants and children is very low, accounting for approximately 1% of supraventricular tachycardia (SVT) substrates.
Atrial premature complex, atrial tachycardia and A-V junctional arrhythmias were attended with Digoxin (0.06 mg/ kg PO BID.
"I chose to support BHF on this occasion because I suffer from atrial tachycardia," explained Anthony.
TABLE 2 Causes of an irregular pulse Sinus arrhythmia Atrial extrasystoles Ventricular extrasystoles Atrial fibrillation Atrial tachycardia with variable response Second-degree heart block Source: Munro and Campbell, eds, MacLeod's Clinical Examination, 2000.