Cardiac Dyspnea

  • Cardiac generally occurs when the heart's pumping action has become weakened or something obstructs the free flow of blood through the heart into the blood vessels.
  • Poor pumping quality can be due to weakened heart muscle caused by coronary artery disease. Narrowing of a valve between the heart's pumping chambers can also prevent blood from flowing from chamber to chamber. If too little blood is pumped forward with each beat there is a buildup of pressure in the lungs.
  • Diminished pumping quality creates shortness of breath b/c blood and fluids begin to back up.
  • Pressure increases in the heart and ultimately in the lungs via the pulmonary veins.
  • This added pressure in the pulmonary veins results in a leaking of fluid from the bloodstream into the air sacs in the lungs.
  • As the amount of fluid increases in the air sacs, breathing becomes more difficult.
  • In addition, fluid may back up into the lower legs, causing swelling.
  • With or without fluid accumulation in the air sacs, the buildup of pressure in the pulmonary veins also can cause the lung tissue to lose its suppleness and create the sensation of labored breathing.


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1 comments:

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