Fig. 2
From: Mechanical ventilation weaning issues can be counted on the fingers of just one hand: part 1
Pulse wave Doppler and tissue Doppler. a Trans-mitralic Doppler; an early wave (E wave) is displayed on the monitor that represents the first phase of the diastole as a passive phenomenon, limited only by the stiffness of the left ventricle or by interventricular interdependence—right ventricular push over the left ventricle via the septum. The E wave in patient with sinus rhythm is followed by atrial contraction (A wave). b Septal tissue Doppler; tissue Doppler directly measures myocardial velocities by means of the Eʹ wave in a load-independent way. The combination of the trans-mitral Doppler E wave, the tissue Doppler Eʹ wave, and the E/Eʹ ratio at the end of an SBT also seems to be capable of predicting weaning failure from diastolic dysfunction