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Atrial Rhythms
Term | Definition |
---|---|
Accessory pathway | an extra bundle of working myocardial tissue that forms a connection between he atria and ventricles outside the normal conduction system |
Altered automaticity | a disorder of impulse formation in which cardiac cells fire and initiate impulses before a normal SA node impulse |
Atrial kick | blood pushed into the ventricles because of atrial contraction |
Atrial tachycardia | three or more sequential PACs occurring at a rate of more than 100 bpm |
Bigeminy | dysrhythmia in which every other beat is a premature ectopic beat |
Blocked premature atrial complex | PAC not followed by a QRS complex |
Bruit | blowing or swishing sound |
Burst | three or more sequential ectopic beats; also referred to as a salvo or run |
Bypass tract | term used when one end of an accessory pathway is attached to normal conductive tissue |
Carotid sinus pressure | type of vagal maneuver in which pressure is applied to the carotid sinus for a brief period to slow conduction through the AV node |
Compensatory pause | pause for which the normal beat after a premature complex occurs when expected; also called a complete pause |
Couplet | two consecutive premature complexes |
Delta waves | slurring of the beginning portion of the RS complex, caused by pre-excitation |
F waves | fibrillation waves; irregularly shaped atrial waves associated with atrial fibrillation; occurring at a rate of 400 to 600 bpm |
Focal atrial tachycardia | AT that begins in a small area (focus) with the heart |
Multiformed atrial rhythm | Dysrhythmia that occurs because of impulses originating from various sites, including the SA node, the atria, and/or the AV junction; requires at least three different P waves, seen in the same lead, for proper diagnosis |
Nonconducted PAC (blocked PAC) | PAC that is not followed by a QRS complex |
Noncompensatory pause | a pause that often follows a premature atrial complex that represents the delay during which the SA node resets its rhythm for the next beat; pause is noncompensatory if the normal beat following the premature complex occurs before it was expected |
Paired beats | two consecutive complexes |
Palpitations | an unpleasant awareness of one's heartbeat |
Paroxysal supraventricular tachycardia (PSVT) | a regular, narrow-QRS tachycardia that starts or ends suddenly |
Preexcitation | term used to describe rhythms that originate from above the ventricles but in which the impulse travels by a pathway other than the AV node and bundle of His; thus the supraventricular impulse excites the ventricles earlier than normal |
Premature complex | early beat occurring before the next expected beat; can be atrial, junctional, or ventricular |
Quadrigeminy | dysrhythmia in which every fourth heartbeat is a premature ectopic beat |
supraventricular | originating from a site above the bifurcation of the bundle of His, such as the SA node, atria, or AV junction |
Trigeminy | dysrhythmia in which every third beat is a premature ectopic beat |
Vagal maneuver | methods used to stimulate the vagus nerve in an attempt to slow conduction through the AV node, resulting in slowing of the heart rate |
Wandering atrial pacemaker (multiformed atrial rhythm) | cardiac dysrhythmia that occurs because of impulses origination fro various sites, including the SA node, the atria, and/or the AV junction; requires at least three different P waves, seen in the same lead, for proper diagnosis |
Wolff-Parkinson-White syndrome | type of preexcitation syndrome, characterized by a slurred upstroke of the QRS complex (delta waves) and wide QRS |
Formation | altered automaticity and triggered activity are disorders in... |
conduction | reentry is a disorder in impulse... |
automatic | reference given to dysrhythmias that result from disorders of impulse formation |
reentrant | reference given to dysrhythmias that result from a disorder in impulse conduction |