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What is the standard height and width of a large box on an EKG strip?
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Height: 5 mm (0.5 millivolts); Width: 5 mm (0.20 seconds).
In precordial leads V1-V6, what should the R wave and S wave progression be?
R wave should increase and S wave should decrease from V1 to V6.
What anatomical position is Lead aVR associated with?
Right ventricle and basal septum.
What physiological process does the T wave represent?
Ventricular repolarization due to negative charge moving towards a negative electrode.
Which precordial leads focus on the lateral wall of the left ventricle?
V5 and V6.
What are the normal duration limits for the PR interval and the QRS complex?
PR Interval: <0.20 seconds; QRS Complex: <0.12 seconds.
How is ventricular depolarization shown in Lead II of a 12-lead EKG?
By the QRS complex.
In the context of EKGs, what does the isoelectric line indicate?
No net movement or electrical activity perpendicular to the lead.
What does a small box on an EKG strip represent in terms of time?
0.04 seconds.
What causes the positive deflection observed in an EKG?
Positive charges moving towards a positive electrode.
Which EKG segment corresponds to the electrical activity being held in the AV node?
PR Segment.
What is represented by the P wave on an EKG?
Atrial depolarization.
How does the QT interval vary between males and females?
Generally <430 ms for males and <460 ms for females.
What does the R wave primarily represent?
Ventricular depolarization, particularly large for the left ventricle.
What specific areas of the heart do the limb leads (II and III) monitor?
The inferior wall of the heart.
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