supraventricular 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.

su·pra·ven·tric·u·lar tach·y·car·di·a (SVT),

rapid heart rate due to a pacemaker anywhere above the ventricular level, that is, sinus node, atrium, atrioventricular junction. The QRS complexes are always narrow unless there is rate-related aberrancy or preexisting intraventricular conduction delay.

supraventricular tachycardia (SVT)

[-ventrik′yələr]
Etymology: L, supra + ventriculus, little belly
any cardiac rhythm with a rate exceeding 100 beats/min that originates above the branching part of the atrioventricular (AV) bundle, that is, in the sinus node, atria, or AV junction.

supraventricular tachycardia

Paroxysmal atrial tachycardia Cardiology An arrhythmia initiated by a premature atrial beat in the AV node, SA node, or bundle to the point of bifurcation; once the ventricle contracts, an echo atrial beat is stimulated via a retrograde tract, resulting in a reverberating re-entry phenomenon, resulting in an atrial rate of 180-300 beats/min Management Simple vagal stimulation–eg, carotid sinus massage, ice bag, breath-holding; if intense, cardioversion or digoxin therapy

supraventricular tachycardia

Episodes of abnormally fast heart-rate lasting for hours or days. The rate may be as high as 300 beats per minute but is usually between 140 and 180. It is caused by fast spontaneous impulses, arising in the upper chambers of the heart, that over-ride the natural pacemaker. There may be chest pain, breathlessness, consciousness of the heart action (PALPITATIONS) and faintness. Attacks may be stopped by the VALSALVA MANOEUVRE or by the use of antiarrhythmic drugs. Sometimes electrical cardioversion is necessary.

Supraventricular tachycardia

A fast heart beat that originates above the ventricles.

tachycardia

abnormally rapid heart rate.

atrial tachycardia
rapid contraction of the atrium arising from an ectopic focus in the atrium. The heart rate remains normal.
ectopic tachycardia
rapid heart action in response to impulses arising outside the sinoatrial node.
idioventricular tachycardia
one occurring as a compensation for a sinus bradycardia and A-V block.
junctional tachycardia
that arising in response to impulses originating in the atrioventricular junction, i.e. the atrioventricular node.
orthostatic tachycardia
disproportionate rapidity of the heart rate on arising from a recumbent to a standing position.
paroxysmal tachycardia
episodes of an abrupt and marked increase in heart rate in a resting patient, with an equally sudden return to normal.
sinus tachycardia, simple tachycardia
an increase in heart rate from heightened activity of the sinoatrial node, such as occurs with excitement or pain.
Enlarge picture
Sinus tachycardia in a dog.By permission from Ettinger SJ, Feldman E, Textbook of Veterinary Internal Medicine, Saunders, 2004
supraventricular tachycardia
a combination of junctional tachycardia and atrial tachycardia.
ventricular tachycardia
see ventricular tachycardia.

Patient discussion about supraventricular tachycardia

Q. SVT and AF, Hearts that go fast to slow or any others probs with the beats of any kind and Ablation of hearts I have had Ablation done once and I am still having passing out spells and still on 50mg toprol 2 times a day till two days ago, now I am on 150 to 200 aday again. Its not the first time I have had to up meds. I had ablation down 4/22/05. I can breath better now but but it didnt take it away as you can tell. Now Dr Leonardie would like to do it again . This is the big ????! Will it or can it work 100% this time, or will it hit and miss some again???? MTT

A. Well I can understand the frustration of having to go through this procedure yet another time. There are no guarantees in medicine. You should follow your doctor's advice, as another proceudre might be more helpful than the last one. However you should keep in mind that nothing is for sure.

More discussions about supraventricular tachycardia
References in periodicals archive ?
Major Finding: Inappropriate shocks occur in 13% of implantable cardioverter defibrillator recipients, mainly because of misdiagnosis of supraventricular tachycardia, and are associated with a higher risk of all-cause mortality.
Ventricular tachycardia versus Supraventricular tachycardia with aberration In: Cardiac electrophysiology from cell to bedside.
Thus, the perfect left bundle branch block in this patient suggests a supraventricular tachycardia with the new onset of left bundle branch block, which could be rate related and/or due to temporary or permanent damage to the left bundle branch during removal of the patient's heavily calcified bicuspid aortic valve and its replacement with a 29-mm St.
and European countries because of its beneficially effects on heart rate control in artial fibrillation/flutter and stopping/preventing paroxysmal supraventricular tachycardia.
I WATCHED the television in disgust last week as Tony Blair went into hospital for an operation to correct his heart condition, supraventricular tachycardia - a condition which was only diagnosed last year.
The Prime Minister was diagnosed with supraventricular tachycardia, or SVT, which is often described as an electrical short-circuiting of the heart.
Last month the 50-year-old Prime Minister needed hospital treatment when he was diag- nosed with supraventricular tachycardia, in which the heart beats much faster than usual.
Doctors there carried out a series of checks and diagnosed supraventricular tachycardia,in which the heart beats much faster than usual.
NEW YORK -- Fetal atrial flutter gets diagnosed about 2 weeks later in pregnancy than does fetal supraventricular tachycardia, but mortality rates are similar in fetuses with either polyarrhythmia, according to results of a metaanalysis.
DTI-0009 is more selective, more potent, and has a much longer duration of action than adenosine, which is currently marketed for the atrial arrhythmia paroxsymal supraventricular tachycardia (PSVT)," said Donald A.
Major safety fears over supraventricular tachycardia (SVT) medications are threatening many elderly patients, and even encouraging some to opt for surgery, claims a new report by healthcare experts The authors.
The study, "Arrhythmia Burden among Community Dwelling Elderly Using Two Weeks of Ambulatory ECG Recordings," analyzed the frequency and prevalence of atrial fibrillation (AFib), premature atrial complexes (PACs) and premature ventricular complexes (PVCs), and supraventricular tachycardia (SVT) and non-sustained ventricular tachycardia (nsVT) in a subset of the Atherosclerosis Risks In Communities (ARIC) Study, which is a National Heart, Lung and Blood Institute (NHLBI) supported cohort.