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### 15 Cards in this Set

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 The single largest killer of Americans is: adult respiratory distress syndrome cancer coronary heart disease diabetes hypotension coronary heart disease For Lead I, placement of the leads is on the: left arm, left leg left arm, right leg right arm, left arm right arm, left leg right arm, right leg right arm, left arm The ECG-component that represents atrial depolarization is the: P wave QRS complex T wave U wave S-T segment P wave Ventricular repolarization is indicated on the ECG tracing by the: P wave QRS complex T wave U wave S-T segment T wave The time necessary for ventricular depolarization is represented by the: P-R interval QRS interval QT interval S-T segment QRS complex QRS interval A delay in the AV node is indicated by a P-R interval: between 0.01 and 0.20 seconds between 0.04 and 0.12 seconds greater than 0.40 seconds less than 0.12 seconds greater than 0.20 seconds greater than 0.20 seconds The total duration of ventricular depolarization is represented by the: P-R interval QRS duration QT interval S-T segment QRS interval QT interval With a heart rate of 180 beats per minute, you would expect the QT interval to be: approximately 0.40 seconds between 0.33 and 0.42 seconds greater than 0.42 seconds less than 0.33 seconds none of the above less than 0.33 seconds The duration from the beginning of the P wave to the beginning of the QRS complex is the: P-R interval QRS duration absolute refractory period relative refractory period U wave P-R interval The interval during which the heart cannot be stimulated to depolarize except by a strong stimulus is the: absolute refractory period relative refractory period P-R interval QT interval P wave relative refractory period A significant Q wave has a: duration of at least 0.02 seconds duration of at least 0.04 seconds negative deflection at least 1/4 the height of the QRS complex positive deflection at least 1/3 the height of the QRS complex deflection equal to the height of the P wave duration of at least 0.04 seconds Which of the following ECG lead combinations can be used to evaluate the anterior and lateral walls of the left ventricle? aVR and V1 V1 and V2 V3 and V4 V5 and V6 V1 and V6 V5 and V6 The ____ method of calculating heart rate counts the number of complexes in a 6-second strip P-P interval R-R interval 6-second triplicate hexagonal 6-second Which of the following is characteristic of an abnormal sinus rhythm? irregular rhythm P-R interval of 0.16 seconds QRS duration of 0.08 seconds rate of 60-100 P wave before the QRS complex irregular rhythm The passive transfer of pacemaker sites from the SA node to other latent pacemaker sites in the atria or AV junction is: wandering atrial pacemaker premature atrial contractions premature junctional contractions premature ventricular contractions atrial fibrillation wandering atrial pacemaker