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10 Cards in this Set

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  • Back
What does each small square represent on EKG paper?
Moving horizontally, each small square represents .04 sec, when the EKG is run at the proper paper speed of 25mm/sec.
Each set of 5 small squares represents 0.2 sec.
What is the P wave?
It is a record of atrial muscle depolarization. The actual firing of the SA node does not give a strong enough signal to be detected in the ECG.
What is the P-R interval?
It is the interval from the beginning of the P wave to the beginning of the QRS complex.
It reflects the time required for conduction of the impulse through the atria, AV node, common bundle and bundle branches up to the time of ventricular depolarization.
What is the QRS complex?
The interval from the beginning of the Q wave to the end of the S wave. It reflects the depolarization of muscle fibers in the ventricles.
What is the S-T segment?
It is the segment between the end of the QRS interval and the beginning of the T wave.
It is the pause between ventricular muscle firing and ventricular muscle repolarization.
The T wave represents ventricular muscle cell repolarization. TRUE/FALSE
What is the Q-T interval?
It is the interval between the beginning of the QRS and the end of the T wave. It represents duration of ventricular electrical activity.
What is the U wave?
It is not always seen. It may be due to repolarization of the bundle branches and Purkinje fibers. It occurs between the T and P wave.
What is the purpose of the electrode leads?
These leads are used to detect electrical signals from the heart positioned at various points on the body to look at the heart at different angles.
The classical 12 leads are:
1, 11, 111, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6.
How does cardiac depolarization spread?
It spreads from upper right to lower left(in reference to the body as a whole), considering the tilt of the heart.