Week 4 Scholarly Questions and Analytical Thinking

Monday
What is a wave?
What is a segment?
What is an interval?
What are the components that we measure on a P, Q, R, S, T? Can you draw and label them correctly!
What is a normal PR Interval (PRI)?
What is an accelerated PRI?
What is a prolonged PRI?
What is a normal QRS?
What is the Gray area of a QRS?
What is an abnormal QRS?
What is the J point.
What is the PR segment?
If the PR Interval were the following lengths, how would you classify? .09, .10, .11, .12, .17, .20, .21, .22, .26
What is the ‘transition lead’? Where do you find the transition lead (standard leads, augmented leads, precordial leads)?
What is the difference ‘R to R waves‘ vary for it to be classified as irregular? (In time and in small boxes)
The delay at the AV Node is seen WHERE on the P, Q, R, S, T?
The ST segment on the P, Q, R, S, T represents what?
If the depolarization is perpendicular to the lead, what will it look like on the EKG?
What does biphasic mean?
What limb leads of the heart will tend to have the largest P waves? Try to brainstorm this from your understanding of the depolarization pathway.
Which limb lead of the heart will have an inverted P wave.Try to brainstorm this from your understanding of the depolarization pathway
Keep practicing labeling the Hexaxial Reference System and also label the 6 limb leads on this. Be able to do this effortlessly!
Can you draw and lavel all waves, segments, intervals and points of the P, Q, R, S, T?
How do you count cardiac cycles on an EKG rhythm strip (hint, start from left and count across the QRS complexes)?

Wednesday
How do you determine the mean QRS? Practice, Practice Practice! What leads do you use? What steps do you follow?
When measuring the QRS axis, where is your actual starting point on the heart? (i.e., SA Node, AV Node, Bundle of His, Bundle branches, Purkingie fibers)
What is the range for a normal QRS axis (from what degrees to what degrees)? What is the range for right axis deviation? What is the range for extreme right axis deviation? What is the range for left axis deviation?
When reporting the mean QRS, how is this correctly done?

Make sure you know your perpendicular leads!
Practice determining the QRS axis.

What do you know about the mean QRS and the Biphasic (or isoelectric lead)?
Do the terms QRS axis and mean QRS say the same thing? What do we know about the mean QRS and the biphasic lead? Are they parallel to each other, perpendicular to each other, or what?
What leads are perpendicular to each other?
What anatomical location does the QRS begin? (SA node, AV node, Bundle of His, Purkinjie fibers)
How do you count Cardiac cycles across a tracing?
What are the classification ranges for the axis of the mean QRS? Make sure you know the range and how to classify! What is normal axis? What is left axis deviation? What is right axis deviation? What is extreme right axis deviation? How do you correctly report the mean QRS (also called the QRS axis)?

End

EKG Page