Why does pleural effusion usually occurs in the right hemithorax in acute heart failure? Could someone explain the mechanism? Thank you.

  • $\begingroup$ where did you see/read that pulmonary edema usually occurs in the right hemithorax? as far as I typically see it's generally in both lung fields on a chest x-ray when it's present $\endgroup$ Commented Feb 22, 2017 at 19:59
  • $\begingroup$ Sorry i just realized i wrote it wrong. It should be pleural effusion, not pulmonary edema. I cannot say any reference textbook. Because it is written on a book for medical exams. $\endgroup$
    – user30133
    Commented Feb 22, 2017 at 20:07
  • $\begingroup$ thanks for clarifying... I still have the same question... where have you seen that pleural effusions occur on the right instead of the left? can you cite that in your question? $\endgroup$ Commented Feb 22, 2017 at 20:25
  • $\begingroup$ @VanceLAlbaugh I am curious about this question though I don't know the answer. Searching for the source of this information I think OP might have it slightly wrong; bilateral pleural effusion is by far most common, but unilateral pleural effusion is typically in the right. This seems to be commonly reported, here's one example, here is another. $\endgroup$
    – Bryan Krause
    Commented Feb 22, 2017 at 20:33
  • $\begingroup$ completely agree @BryanKrause $\endgroup$ Commented Feb 22, 2017 at 20:34


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