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

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Understanding EKG graphs is crucial for analyzing cardiac cycles, with one period representing one complete cycle. The discussion highlights confusion in distinguishing features across the first, second, and third cycles on the provided graph. It notes that the second and third cycles appear to lack the repolarization of the atrium, which is characterized by a slight voltage drop leading to the Q wave, followed by the R and S waves. The user is seeking clarification on these differences, particularly regarding the contraction of the ventricles. Accurate interpretation of EKG features is essential for proper analysis in a physics lab context.
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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Hey! Tell us the answer.
 

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