abnormally rapid heart rate, usually taken to be over 100 beats per minute. adj., adj
A, Sinus tachycardia; B, Ventricular tachycardia. From Chernecky, 2001.
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
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.
ectopic tachycardia rapid heart action in response to impulses arising outside the sinoatrial node.
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.
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 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.
sustained ventricular tachycardia tachycardia that lasts more than 30 seconds and leads to hemodynamic collapse.
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
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
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
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