Some of our US machines can perform all tasks a full-seize “professional” echo machine can. Other units have excellent, but not full capability. Specifically, it concerns 2 functions.

Continuous Wave Doppler (CWD) is required for detection and quantification of high velocity flows, which the “usual”, Pulse Wave Doppler (PWD) cannot quantify. This is particularly important is assessing pathological left-sided flows, such as those of AS, AI, MR and MS. However, right-sided pathological flows of PI and TR are also often high velocity, making CWD critical in electrocardiography.

image: MR. (from Feigenbaum)

Tissue Doppler (TD) detects high amplitude low frequency movements of the myocardium, which are “normally” purposefully filtered out. It is an important tool in assessment of LV and RV systolic and diastolic function.

image: Mitral annular e’ wave is an index of LV diastolic function. (www.criticalecho.com/sites/default/files/images/6.6.png)