| Week 3 Scholarly Questions and Analytical Thinking Monday EKG Basics Who first discovered the precordial leads? In discussing EKG paper we always use the terms large boxes and small boxes. On the vertical axis we measure what? (hint–amplitude) On the horizontal axis we measure what? IMPORTANT!!: Know your time in seconds with EKG graph paper! One small box (on the horizontal axis is how many seconds? How many seconds is 2 small boxes? How many seconds is 3 small boxes? How many seconds is 4 small boxes? How many seconds is 5 small boxes? How many seconds in 1 large box? How many seconds in 5 large boxes? How many large boxes in 3 seconds? How many large boxes in 6 seconds? How many seconds in 12 small boxes? In 20 small boxes? In 26 small boxes? In 38 small boxes? How many small boxes in 2.0 seconds? How many small boxes in 1.32 seconds? How many small boxes in 1.64 seconds? What is the speed of EKG paper? What are the Triplets? Practice, Practice, Practice and Practice some more labeling them on you EKG strips in your text. What does biphasic mean? What does isoelectric mean? Class continue reviewing the Triplets HR method. Get very familiar and comfortable with this HR estimation method. Practice, Practice, and Practice some more the ‘R wave to R wave‘ HR measurement method as well. Get very comfortable and efficient at this method. How do you measure a HR if it is irregular. Please note: we use a .16 second difference (or greater) in different R wave to R waves as the criteria for a irregular HR rhythm. The text uses a .12 second difference, but other KEY sources use the .16 second difference. If you see this once in the lead you are given, the classification is ‘irregular rhythm.’ How many small boxes in .16 seconds? If the tracing is irregular rhythm, how do you determine heart rate? (We call this the 6-sec method. How many large boxes do you use with this method? Practice measuring HRs with the triples and R wave to R wave methods with the many EKG tracings in your text. Reminder, the precordial or chest view the heart in what plane? Reminder, what are the 6 limb leads and where are the charges on them? What plane do the 6 limb leads view the heart? Also, what is the most accurate definition of ‘precordial?’ Which way will a deflection go on the EKG paper if the depolarization is going towards the electrode? Which way will a deflection go on the EKG paper if the depolarization is going away from the electrode? If the deflection is going towards the electrode, will it have the greatest amplitude if it is parallel to the lead or at an angle to the lead. Make sure you can identify depolarization directions and what will happen on the EKG stylus. If the depolarization is perpendicular to the lead, what will you see on the EKG stylus? Wednesday and Friday are the EKG PREP Labs: Bring your Workbook to the Lab (page 6) We may get started on the Below topics...if not, this will be picked up with the next class. 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)? End |
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