[Current and future concepts of echocardiography: a review laboratory technicians]

We, cardiac sonographers are mostly engaged in by two-dimensional, M-mode and Doppler echocardiography. Bedside echocardiography tends to help evaluating index of cardiac function and hemodynamics quantitatively according with the progress of technique and improvement of equipment. Good examples are evaluation of left ventricle volume and regional wall motion abnormality by two-dimensional echocardiography, and systolic as well as diastolic left ventricle function and valvular stenosis and regurgitation by Doppler echocardiography. They improve the diagnostic value of cardiac echocardiography. However, many limiting factors based on error and poor indication should be taken into consideration.