Flashcards
Congestive Heart Failure
Flashcards do conjunto (4)
- 1What is congestive heart failure (CHF)?A progressive condition where damage to one or both ventricles impairs the ability to maintain CO.
- 2How does left ventricle failure lead to pulmonary oedema?- less blood pumped out of the heart, so a decreased CO.
- this gathers fluid in the lung area, as the blood comes from there into the left ventricle.
-increases hydrostatic pressure inside the pulmonary vessels, favouring filtration.
- more fluid let out of the vessels, casuing pulmonary oedema. - 3Explain how peripheral oedema is often present with right or biventricular failure.- not enough blood being oxygenated, as the right ventricle cannot pump efficiently to the lungs.
- build-up of blood in the veins/capillaries, increasing hydrostatic pressure, which favours filtration into the interstital fluid space.
- right ventricular failure is caused by left ventricular filtration. - 4Using Laplace's law, explain how long-term hypertension may lead to CHF.- high blood pressure in the arteries (aorta).
- the heart has to pump harder to generate a higher pressure in the ventricles to open the aortic valves, allowing ejection to take place.
- to do this, the blood volume is increased & this increases ESV & EDV.
With Laplace's Law, as there is now more volume in the ventricles, this means that the radius of the ventricles has increased. With an increased radius, there is more wall stress in the chamber. There is an increased afterload, and the heart has to pump harder in order to get the blood out of the chamber. This means that the heart muscle is working more, so ventricular hypertrophy will occur. This means that the heart will spend more time in contraction, which, over time, can lead to heart failure.
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- Cardiovascular System FlashCards sobre Congestive Heart Failure, criado por Krupali Parikh em 18-04-2018.
- Criado por
- Krupali Parikh
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