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Atlas of Human Body Ultrasound Scanning_ Methods and Diagnostic Applications ( PDFDrive ).pdf
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6  Echocardiography

117

 

 

3.7.1\ Method

The patient lies on the left side. Parasternal aortic root short-axis view and parasternal right ventricular outflow tract–pulmonary artery long-axis view are used. The sample volume is placed below or above the pulmonary valve orifice.

3.7.2\ Section Structure

PW or CW Doppler profile of right ventricular outflow tract and pulmonary artery gives a negative and narrow deflection with one wave on the spectral display in systole.

3.7.3\ Measuring Method and Normal Value

The normal range of Vmax of pulmonary artery determined in this view is 0.5–1.0 m/s, with mean 0.75 m/s.

3.7.4\ The Clinical Application Value

Pathologic regurgitation will occur when the pulmonary valve annulus is dilated secondary to pulmonary hypertension or a pathologic damage of the valves, in which a positive diastolic turbulent flow spectrum without clear window area can be recorded by putting the sample volume in the right ventricular outflow tract just proximal to the pulmonary valve.

3.7.5\ Notice

A mild regurgitation can be seen in some normal persons, in which a positive and diastolic spectrum can be obtained in the right ventricular outflow tract in this view.

118

S. He

 

 

3.8\ Color Doppler/Flow Mapping

of Pulmonary Artery Orifice

a

b

Fig. 6.46  Color Doppler/flow mapping of pulmonary artery orifice. (a) Systole. (b) Diastole

3.8.1\ Scanning Method

The patient lies on the left side. Parasternal aortic root short-axis view and parasternal right ventricular outflow tract–pulmonary artery long-axis view are used.

3.8.2\ Section Structure

During early-mid systole, a flow with color-­ coded blue with a brighter area in the center is seen in right ventricular outflow tract and across the pulmonary valve orifice.

more severe the stenosis. A diastolic regurgitation as a jet of red or mosaic color flowing in a retrograde direction from the pulmonary valve orifice to the right ventricular outflow tract when the pulmonary valve is insufficient. According to the radio of the regurgitant jet width to the right ventricular outflow tract width, the severity of pulmonary regurgitation can be estimated. If the ratio is <50%, the regurgitation is mild or moderate. If the ratio is >50%, the regurgitation is severe.

3.8.3\ The Clinical Application Value

3.8.4\ Notice

When pulmonary stenosis presents, a systolic mosaic jet will be seen across the pulmonary valve orifice as widened, spring-like jet in the pulmonary artery. The more slender the jet is, the

A mild insufficiency can be seen in some normal persons, in which a red regurgitant jet can be detected flowing from the subvalve into the right ventricular outflow tract in this view.