Created at 2:28 a.m. Nov, 10, 2025
Author:
mrvhyte
Type of change:
Updated content
Rationale for change
I think this wording makes more sense
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This is due to a paradoxical embolus from the right sided circulation to the left. These patients may also present with RBBB with LAD and a prolonged PR interval on ECG.
Theoretically, this can similarly occur with a VSD, however it is much more likely in an ASD as the pressure gradient between the 2 atrial chambers is much smaller, so blood (and clots) can flow from right to left occassionally. In a VSD, the LV pressure is usually much greater than the right so blood flow is usually on L → R, so paradoxical embolism is much rare (outside of Eisemenger's).
Theoretically, this can similarly occur with a VSD, however it is much more likely in an ASD as the pressure gradient between the 2 atrial chambers is much smaller, so blood (and clots) can flow from right to left occassionally. In a VSD, the LV pressure is usually much greater than the right so blood flow is usually on L → R, so paradoxical embolism is much rare (outside of Eisemenger's).
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Talley & O'Connor
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Source
Atrial septal defects. PassMed Textbook. Accessed June 12, 2024. https://www.passmedicine.com/.
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