TTE - parasternal short-axis view of the vessels at the base of the heart.
RV: right ventricle, PA: trunk of the pulmonary artery.
This view is obtained from the view visualized in film 4 by tilting the probe upwards. By using pulsed Doppler, this view can be used to record the ejection flow of the right ventricle just upstream of the pulmonary valve. This enables measurement of the area under the flow curve (VTI, time-velocity integral) as well as the diameter of the pulmonary annulus to calculate the stroke volume of the right ventricle (SV = TVI x Pi D2 / 4). It is also possible to find indicators of pulmonary hypertension: (i) measurement of the acceleration time (from the start of flow to peak velocity) rather suggestive of pulmonary hypertension when it is shortened (Tacc < 100 ms); (ii) appearance of the flow: the biphasic appearance of the flow visualized on this clip was recorded in a patient presenting massive pulmonary embolism. This appearance is entirely consonant with the diagnosis.
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