Factors associated with contraceptive choice or effectiveness of use include women's personal characteristics and childbearing goals. These factors can change throughout a persons life. Something that would cause one to change the birth control they use is definitely cost and availability and all of the above.
Mitral stenosis causes reduced blood flow through the narrowed valve opening from the left atrium to the left ventricle. As a result, the volume of blood bringing oxygen from the lungs is reduced. This can make you feel tired and short of breath.
