The Peak E and A Wave Velocity mark the functioning of the left ventricle of the heart. It shows the ratio of blood flow in E wave, also the early diastole to the A wave, the late diastole, by the atrial contraction. The ratio is calculated applying Doppler echocardiography. When the ratio is showing some abnormalities, it is an indication that the left ventricle has an issue and cannot pump blood into the circulation system. The phenomenon is called diastolic dysfunction, and it can cause heart failure. When the ratio is effective, diastolic relation takes place using four phases in the cardiac cycle, and they are the isovolumetric relaxation, early filling, diastasis, and atrial contraction.
Echocardiography allows for direct observation of the cardiac structures of the patient as well as the hemodynamic status. It allows the physicians to carry out immediate intervention which relates to the replacement of volume and applying inotropic agents. The process can also be applied in some patients as a way of explaining various cardiac morphological and functional analyses. Echocardiography helps to understand the cardiorespiratory system preload, overload, and afterload in association to consumption of oxygen. Monitoring the existing heart and lung issues can be done, and it will help determine the problems that exist and prevent fatal cases.
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E/e' utilization is associated with unreliability when filling pressure. It indicates a poor correlation with the intracardiac filling pressure, mostly when the LV volumes are large. The quote by Mourad on "e' < 8cm/s shows that the volume of the lung is large. Since the filling pressure is unreliable, a patient in ICU may not get the oxygen required since the pressure to pass blood is not enough resulting in death.
