Question at position 10 Which letter on the image depicts the S-T segment?BADEFC

Question

BlackTom AI · Accepted Answer

To identify the S-T segment, I first recall that the S-T segment is the flat, isoelectric portion of the ECG tracing that occurs after the S wave (the final downward or upward deflection of the QRS complex) and ends at the beginning of the T wave. Now, let’s evaluate each labeled option in the image:

Option B: This corresponds to the tall QRS complex spike, which represents ventricular depolarization. It is not the S-T segment since the S-T segment is the flat region after the QRS complex and before the T wave. Therefore B is incorrect.

Option A: This is the wave preceding the QRS complex, likely representing the P wave, which corresponds to atrial depolarization. The S-T segment occurs later, not during the P wave, so A is incorrect.

Option D: This seems to indicate a horizontal distance or gap before the next segment, not the actual flat isoelectric line after S and before T. It does not align with the S-T segment’s position on the tracing, so D is incorrect.

Option E: Here we see a short horizontal, flat portion located after the S wave and before the onset of the next upward deflection (which is the T wave). This is precisely the S-T segment, the flat isoelectric interval between S and T.

Option F: This appears to span a larger interval or reflect a different measurement on the tracing, not the specific S-T segment. It does not match the isolectric segment between S and T, so F is incorrect.

Option C: This label corresponds to a later part of the tracing, likely associated with the return toward baseline or the tail end of the T wave, not the flat S-T interval. Therefore C is incorrect.

Question at position 10 Which letter on the image depicts the S-T segment?BADEFC

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Question at position 10 Which letter on the image depicts the S-T segment?BADEFC

View Explanation

Log in for full answers

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