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Figure 1 M-Mode Characteristics of LV Intracavitary Flow Along the Longitudinal Axis

(A) Doppler velocities are shown in red (flow toward left ventricular [LV] apex) and blue (flow toward LV base). (A, B) Phases of the cardiac cycle have been determined with timing of the movement of the mitral valve (MV) and the aortic valve (AV). (C) The M-mode features of Doppler flow are compared with an anatomical M-mode through the LV cavity during contrast infusion. (C, D) The axial movement of contrast bubbles can be compared with the movement of the MV and the AV. Phases: 1, pre-ejection; 2, ejection; 3, isovolumic relaxation; 4, early diastole; 5, diastasis; and 6, late diastole.