Chapter 8 Flashcards
Irregular muscle connection between the atria and ventricles that bypasses the AV node
Accessory pathway
The group of dysrhythmias produced when the SA node fails to generate an impulse and the atrial tissue or areas in the internodal pathways initiate an impulse
Atrial dysrhythmias
Occur when pacemaker sites wander or travel from the SA node to other pacemaker sites in the atria, the internodal pathways, or AV node
Wandering atrial pacemaker rythms (WAP)
Rhythm created when the rate of the WAP rhythm reaches 100BPM or greater
Multifocal atrial tachycardia
A single electrical impulse that originates outside the SA node in the atria
Premature atrial contraction (PAC)
Reactivation of myocardial tissue for a second or subsequent time by the same electrical impulse
Reentry
When a single irritable site in the atria initiates many electrical impulses at a rapid rate, characterized by the presence of regular atrial activity with a picket-fence or sawtooth pattern
Atrial flutter
A ventricular rate of less than 60BPM
Slow ventricular response
Ventricular rate of 100-150
Rapid ventricular response
When multiple disorganized ectopic atrial foci generate electrical activity at a very rapid rate (atrial rate varies from 350-750 BPM)
Atrial fibrillation
General term that encompasses all fast dysrhythmias in which the heart rate is greater than 100 BPM
Supraventricular tachycardia (SVT)
Refers to a sudden onset or cessation or both
Paroxysmal
Methods utilized to stimulate baroreceptors (located in the internal carotid and aortic arch) when these receptors are stimulated the vagus nerve releases acetylcholine resulting in slowing of the heart rate
Vagal maneuvers
Preexcitation syndrome and atrioventricular conduction disorder characterized by two AV conduction pathways and is often identified by a characteristic delta wave seen on an electrocardiogram at the beginning of the QRS complex
Wolff-Parkinson-White WPW syndrome
The final phase of diastole, atrial contraction forces remaining blood into the ventricles: provides 15 percent to 30 percent of ventricular filling
Atrial kick