Learning EKG Graphs: Understand Cardiac Cycles in 1st, 2nd & 3rd Periods

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SUMMARY

The discussion focuses on understanding EKG graphs, specifically identifying features within cardiac cycles. The user seeks clarification on the differences between the first, second, and third cardiac cycles depicted in the attached EKG graph. It is established that the first cycle exhibits atrial repolarization, which is absent in the subsequent cycles. The user notes the presence of an isoelectric line and the sequence of the Q, R, and S waves, indicating a need for deeper analysis of the ventricular contraction phase.

PREREQUISITES
  • Basic knowledge of EKG interpretation
  • Understanding of cardiac cycle phases
  • Familiarity with waveforms: P wave, QRS complex, T wave
  • Experience with graph analysis in a physics context
NEXT STEPS
  • Study the differences between atrial and ventricular repolarization in EKGs
  • Learn about the significance of the isoelectric line in EKG interpretation
  • Research the physiological events corresponding to each wave in the cardiac cycle
  • Explore software tools for visualizing and analyzing EKG data
USEFUL FOR

Students in medical or physics courses, healthcare professionals, and anyone interested in mastering EKG interpretation and cardiac physiology.

MitsuShai
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Hello,

I don't know if I'm posting this in the right section because I need help with reading EKG graphs (and I've never had any experience with them), but I'm doing this for my physics lab class.

I attached the graph I need help with.

So basically, one period on the graph means one cardiac cycle, right?

From the graph attached I have to figure out the "feature" that is in the 1st cycle but not in the 2nd or 3rd.
I can't see the difference between the cycles. They all have an isoelectric line.
I think I can see that the 2nd and 3rd cycles fail to show the repolarization of the atrium, which is where the the voltage falls slightly and makes a Q wave then after that is an R wave and then the S wave, the lowest voltage.
Or maybe it doesn't show just the last part (going from R to S), which is the contraction of the ventricles.
 

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