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7 Cards in this Set

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regarding positions of the ECG leads, these arrows indicate the axes between the negative and positive electrodes. TRUE/FALSE
TRUE. cardiac depolarization that spreads in the direction of an arrow, i.e. toward a positive electrode, results in a positive(upward) deflection on the ECG above the baseline. Those travrling away from the positive electrode will have a negative deflection(downward) below the baseline.
Since depolarization normally spreads from upper right to lower left, this places the depolarization as spreading, for the most part, toward positive electrodes, except for AVR and sometimes V1. TRUE/FALSE
TRUE.
What can be said regarding vertical and horizontal planes of the body?
The net result of the various electrode positions is that the ECG looks at the heart from a variety of positions. Leads 1,11, 111, aVR, aVL, aVF look at the heart along the vertical(frontal) plane, whereas leads V1-V6 look at the heart along the horizontal(transverse) plane.
Why is there a downward deflection of the Q wave?
It occurs because septal depolarization proceeds from left to right, arising from connections from the left bundle branch.
ventricular depolarization spreads from the subendocardial to the subepicardial surface.
List one simple way for calculating heart rate?
Count the number of QRS complexes between three markers(6 seconds) and multiply by 10. If we count 6 QRS complexes between 3 markers(found on top of the ECG paper) we would have a rate of 60.
In the above example, we have a rate of 60, yet what would a 2:1 block look like in theory?
A 2:1 block in which there is only one of every 2 P waves gets through and generates a QRS complex.
The atrial rate, as measured by P waves, is about 110-120.
What can the cardiogram actually show?
It can depict heart rate, rhythm, axis of heart rotation, heart muscle hypertrophy, and cardiac muscle ischemia.