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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.
slide 1 of 6. Right atrial enlargement means the heart's right atrium has increased in size. The right atrium plays the role of delivering blood through the tricuspid valve to the right ventricle. A variety of things can cause the right atrium to become enlarged. An EKG is used to diagnose this condition.slide 2 of 6.ight atrial enlargement means the heart's right atrium has increased in size. The right atrium plays the role of delivering blood through the tricuspid valve to the right ventricle. A variety of things can cause the right atrium to become enlarged.