So the heart is a functional organ, but can be thought of in 2 separate pieces. Left heart failure and right heart failure both are usually causes by pressure. Pressure agaisnt the emptying. This causes the muscle to grow in an effort to create more pushing force to squeeze blood out. Eventually it gets too large and can’t pump effectively/can’t fill adequately and less blood leaves the chamber. Left heart failure occurs from the aortic valve being hard to open or high blood pressure. Right heart failure occurs from increased lung resistance or pulmonic valve difficulty. Think of where the blood is going and imagine it fighting back.
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