A tropical climate can be observed in Nicaragua. Just as in the other Central American countries, there are two seasons: the dry and the raining season. During the dry season (January - June) there is virtually no rain and trees and plants start to dry out.
Causes of aortic valve regurgitation include: 1  Congenital heart valve disease. 2  You may have been born with an aortic valve that has only two leaflets (bicuspid valve) or fused leaflets rather than the normal three separate leaflets. 3  This puts you at risk of developing aortic valve regurgitation at some time in your life.
The main cause of tricuspid regurgitation is an enlarged right ventricle. This may be caused by any disorder that causes right ventricular failure, such as increased pressure in the pulmonary artery. Damage to the tricuspid valve may be caused by rheumatic fever.he tricuspid valve regulates the blood flow from the heart's upper-right chamber (the right atrium) to the lower-right chamber (the right ventricle). Two diseases of the tricuspid valve are regurgitation and stenosis. Tricuspid Regurgitation.