Significant TR is more commonly functional than due to organic tricuspid valve disease. The most frequently associated diseases included pulmonary hypertension and cardiomyopathy changing the geometry of the left ventricle. Usually, if isolated and due to a problem with only the valve, it will not increase pulmonary pressures too much. Thus, it is very important ot figure out the underlying cause of your regurgitation.
Calculating pulmonary pressures and calculating the severity of tricuspid regurgitation (TR) have almost nothing in common. In other words, you can have minimal TR, yet have high pulmonary pressures. You can also have moderate TR, yet have near normal pulmonary pressures.
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