I started having some heart palpitations, shortness of breath and dizziness and went to cardiologist for check up. Doctor did ecg, echo and stress test and said I have a very good heart. I Came home studied the reports and echo showed EF of 60%. And I compared It to the test I did last year where echo showed 66% at another doctor. Both reading were by m-mode. Does it mean that my EF is falling and therefore I started having the above symptoms?