Podcast
Questions and Answers
What is the PR interval measured from?
What is the PR interval measured from?
- The beginning of the QRS complex to the end of the P wave
- The end of the PR segment to the beginning of the QRS complex
- The end of the P wave to the end of the QRS complex
- The beginning of the P wave to the beginning of the QRS complex (correct)
What does the PR interval include physiologically?
What does the PR interval include physiologically?
- Atrial depolarization and ventricular contraction
- Atrial depolarization and the propagation of the impulse through the AV node (correct)
- Ventricular depolarization and atrial relaxation
- Ventricular depolarization and atrial contraction
What is the normal PR interval in adults?
What is the normal PR interval in adults?
- 0.05 s to 0.10 s
- 0.30 s to 0.40 s
- 0.20 s to 0.30 s
- 0.12 s to 0.20 s (correct)
What is the PR segment?
What is the PR segment?
What is the duration of one small square in the ECG?
What is the duration of one small square in the ECG?
In which direction does the cardiac impulse cause depolarization of the atria?
In which direction does the cardiac impulse cause depolarization of the atria?
What is the result of the impulse being conducted slowly in the AV node?
What is the result of the impulse being conducted slowly in the AV node?
Which part of the ventricular muscle is the first to be activated?
Which part of the ventricular muscle is the first to be activated?
What is the direction of depolarization of the interventricular septum?
What is the direction of depolarization of the interventricular septum?
What is generated by the depolarization of the left and right ventricular free walls?
What is generated by the depolarization of the left and right ventricular free walls?
Which of the following structures conducts the impulse quickly?
Which of the following structures conducts the impulse quickly?
What is the reason for no electric changes being recorded after the ventricles are completely depolarized?
What is the reason for no electric changes being recorded after the ventricles are completely depolarized?
What is the direction of ventricular muscle repolarization?
What is the direction of ventricular muscle repolarization?
Why are the recordings from all the bipolar limb leads similar to one another?
Why are the recordings from all the bipolar limb leads similar to one another?
What is the relationship between the algebraic sum of LII and the algebraic sum of L1 and LIII?
What is the relationship between the algebraic sum of LII and the algebraic sum of L1 and LIII?
What is the difference between the recordings from the augmented limb leads and the standard limb leads?
What is the difference between the recordings from the augmented limb leads and the standard limb leads?
What is the significance of the similarity between the recordings from the three standard bipolar limb leads?
What is the significance of the similarity between the recordings from the three standard bipolar limb leads?
What is the direction of septum depolarization?
What is the direction of septum depolarization?
What is the characteristic of QRS recordings in leads V1 and V2?
What is the characteristic of QRS recordings in leads V1 and V2?
Which leads overlie the anterolateral wall of the left ventricle?
Which leads overlie the anterolateral wall of the left ventricle?
What is the significance of a negative aVR wave in an ECG?
What is the significance of a negative aVR wave in an ECG?
What is the normal duration of the P wave in a normal heart?
What is the normal duration of the P wave in a normal heart?
Which of the following ECG components is occasionally present in normal persons?
Which of the following ECG components is occasionally present in normal persons?
What occurs during the PR segment?
What occurs during the PR segment?
What is the significance of a P-R interval greater than 0.20 seconds?
What is the significance of a P-R interval greater than 0.20 seconds?
What is the normal duration of the QRS complex?
What is the normal duration of the QRS complex?
What is the significance of a prolonged QRS complex?
What is the significance of a prolonged QRS complex?
What is the QRS complex representative of?
What is the QRS complex representative of?
What is the effect of altering the site of the recording electrode on the QRS complex?
What is the effect of altering the site of the recording electrode on the QRS complex?
What is the characteristic of the T wave in relation to the QRS complex?
What is the characteristic of the T wave in relation to the QRS complex?
In which leads can T wave inversion be diagnosed?
In which leads can T wave inversion be diagnosed?
What is the significance of a prominent U wave?
What is the significance of a prominent U wave?
Which of the following is not an indication for ECG recording?
Which of the following is not an indication for ECG recording?
What is the normal direction of the T wave in leads with large R waves?
What is the normal direction of the T wave in leads with large R waves?
In which leads is the U wave best seen?
In which leads is the U wave best seen?
