There is a note in Mr. G's chart that he had a color flow Doppler echocardiogram done to prepare for this visit. You pull up the results on the computer. You can see that the blood is flowing up through his mitral valve during systole and that his left ventricle wall is thickened, and his left atrium is dilated. The right ventricle looks normal. His ejection fraction is 43%; normal levels are 55-75% (Heart Rhythm Society, 2013). How does Mr. G's altered blood flow explain his signs and symptoms