Transthoracic Assessment of Coronary Flow Velocity Reserve: A Practical Approach to Diagnostic Testing in Patients with Angina and No Obstructive Coronary Artery Disease

Figure 3

Examples of different qualities of coronary flow velocity curves at rest (upper level) and peak hyperemia (lower level). (a) Well-defined and reproducible flow curves. (b) Blurred and inconsistent flow curves (e.g., due to chest movements). (c) Poorly defined flow curves (e.g., due to probe displacement leading to partial loss of coronary flow signal).

(a)

(b)

(c)