I have had many Echos (perhaps as many as 10) over the past 15 years and I have found the reports to differ slightly from year-to-year on such things as size of chambers, and I understand that is because the measurement is an estimate, not an exact measure. I'd take the Cardiologist's opinion on your question. dizziness and weakness can have many sources outside of hear issues. Have you had a full physical exam in the last year or two?