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Pulmonary hypertension is high blood pressure within the artery that connects the lungs and heart. It forces the heart to work harder to transfer blood between the heart and lungs, which may lead to an enlargement of the right side. Thyroid problems, whether they involve an underactive or overactive thyroid, can cause a heart to enlarge.
right heart failure the inability of the right side of the heart to adequately pump venous blood into the pulmonary circulation this causes a back up of fluid in the body resulting in swelling and edema left heart failure the inability of the left side of the heart to pump into the systemic circulation