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Cardiac Dysrhythmia

Common Cardiac Dysrhythmias

Where are the bundles of HIS located? Below the AV node with two on the left side and one on the right.
What is another term for the AV node? Junction (all conduction channels through).
What does the Myocardial action potential involve? Depolarization; Repolarization; Relative Refractory Period; Absolute Refractory Period.
What happens during depolarization? Stimulation of the cardiac cell by the pacemaker cell causing an influx of Na and Ca, outflow of K.
What happens during Repolarization? No impulse entering the cells can cause it to depolarize.
What happens during the Relative refractory period? Impulses entering the cardiac cell now can cause serious, uncontrolled reactions.
What happens during the Absolute refractory period? The retun of the cardiac cell to resting state.
What part of the EKG is the Absolute RP? From the begining of the QRS to the middle of the T
What does the T wave represent? Repolarization of the Ventricle.
What does the P wave represent? SA node fires, stimulates atrial contraction.
What is the P-R interval? Represents the de and repolarization of the atrium (the time it takes to travel from the SA node to the AV node). Average time: .12 - .20
What does the ST segment represent? Early phase of ventricular muscle recovery.
What is the QT interval? The total time for ventricular de and repolarization (should not be less than 1/2 the R-R time. (AVG time: .34-.44) Danger above .45!!!!
What is the passive flow rate from the atria into the ventricle? 75-80%
What is "Atrial Kick"? It is the residual blood left in the atrium that is ejected upon contraction of atrium into ventricle.
What is the duration of the QRS? < or equal to .12
What does a peaked T wave represent? TOO MUCH POTASSIUM
What does and "U"ed T wave represent? Ischemia
A U wave appears on a EKG what does that represent? Repolarization of the Purkinje Fibers.
What is the most accurate method in deciding Rate? Count the number of boxes between two R waves, divide 1500 by the number of boxes.
What is Sinus Arrhythmia? Rhythm=slightly irregular, varies w/respirations; Rate=variable; Normal P wave.
What is Supraventricular Tachycardia (SVT)? Rhythm=Regular; Rate=>150 bpm; T and P waves are together; PR and QT intervals not measurable.
What does Adenosine do to the heart? It is a Chemical Defibrillator used to reset the heart.
What is Atrial Flutter? Rhythm= regular or irregular; Rate=variable; P waves are sawtooth; PR and QT not measurable.
What is Atrial Fibrillation? Alway irregular rhythm, rate.
Be able to recognize Ventricular Tachy, Ventricular Fib and Asystole.
Created by: zj mepn