tachycardia (tak´i-kar´de-a)

Rapid beating of the heart, conventionally applied to rates over 100 per minute.polycardia, tachyrhythmia, tachysystole; [tachy- + G. kardia, heart]
atrial t. paroxysmal t. originating in an ectopic focus in the atrium.auricular t;
atrial chaotic t. multifocal origin of tachycardia within the atrium; often confused with atrial fibrillation during physical examination.
atrioventricular junctional t. t. originating in the A-V junction.A-V junctional t., nodal t;
auricular t. atrial t
A-V junctional t. atrioventricular junctional t
bidirectional ventricular t. ventricular t. in which the QRS complexes in the electrocardiogram are alternately mainly positive and mainly negative; many such cases may represent ventricular t. with alternating forms of aberrant ventricular conduction.
Coumel's t. a persistent junctional reciprocating t. that usually uses a slowly conducting posteroseptal pathway for the retrograde journey.
double t. the simultaneous t. of two ectopic pacemakers, e.g., atrial and junctional t.
ectopic t. a t. originating in a focus other than the sinus node, e.g., atrial, A-V junctional, or ventricular t.
t. en salves short runs of paroxysmal t. of the Gallavardin type. Cf. Gallavardin's phenomenon. [Fr. tachycardia in salvos]
essential t. persistent rapid action of the heart due to no discoverable organic lesion.
t. exophthal´mica rapid heart action occurring as one of the symptoms of exophthalmic goiter.
fetal t. a fetal heart rate of 160 or more beats per minute.
junctional t. supraventricular t. arising from the atrioventricular junction (formerly called nodal t.).
nodal t. atrioventricular junctional t
orthostatic t. increased heart rate on assuming the erect posture.
paroxysmal t. recurrent attacks of t., with abrupt onset and often also abrupt termination, originating from an ectopic focus which may be atrial, A-V junctional, or ventricular.
reflex t. increased heart rate in response to some stimulus conveyed through the cardiac nerves.
sinus t. t. originating in the sinus node.
supraventricular t. rapid heart rate due to a pacemaker anywhere above the ventricular level, i.e., sinus node, atrium, atrioventricular junction. The QRS complexes are always narrow unless there is rate related aberrancy or preexisting intraventricular conduction delay.
ventricular t. paroxysmal t. originating in an ectopic focus in the ventricle. See also torsade de pointes.


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