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MedSchool Forums USMLE QBank S2 splitting widens because …
Spoiler for Answer:
  • ↑O2 in the lung
  • There will be a delay in the opening/closing of the pulmonic valve due to the ↑ volume → Ex. AVM
  • ↑↑↑ Blood volume in the right ventricle (L→R shunts)

What can widen S2 splitting?
Spoiler for Answer:
  • Dilated heart
  • PS/PR
  • Deep breath
  • ASD (L→R shunt)
  • Early in Exercise
  • ↑ Fluid intake
  • SIADH
  • Right Bundle Branch Block

The Medical Library Notes-exchange; post a copy of any notes/revision aids you made which might benefit others.


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