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Atlas of Human Body Ultrasound Scanning_ Methods and Diagnostic Applications ( PDFDrive ).pdf
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94

S. He

 

 

2.19\ Short-Axis View oftheInferior Vena Cava

a1

a2

LL

MHV

IVC

Fig. 6.23  Short-axis view of the inferior vena cava

6  Echocardiography

95

 

 

2.20\ Inferior Vena Cava Long

(Short)-Axis View

a1

a2

LL

IVC

RHV

Ao

 

Fig. 6.24  Inferior vena cava long-axis view

2.20.1\ Scanning Method

The patient lies supine. The transducer is placed in the ventrimesal subxiphoid area with a right slight slanting and the reference point of the beam is directed towards the spine of the patient.

2.20.2\ Section Structure

The structures shown are the hepatic segment of inferior vena cava, right atrial entrance of inferior vena cava, and hepatic vein.

2.20.3\ Measuring Method and Normal Value

The inferior vena cava diameter taken 12 cm before it enters the right atrium is 19 ± 11 mm.

2.20.4\ The Clinical Application

The following contents can be observed from this view: diameter and respiratory variation of the hepatic segment of inferior vena cava, acoustic transmission (uniformity) and abnormal object in inferior vena cava, blood flow signal in hepatic vein, and position between inferior vena cava and abdominal aorta.

96

S. He

 

 

2.21\ Left Parasternal Right

Ventricular Outflow Tract

Long-Axis View (2)

a1

a2

RVOT

LV

PV mPA

b1

b2

RVOT

LV

mPA

Fig. 6.25  Left parasternal right ventricular outflow tract long-axis view. (a) Diastole. (b) Systole

2.21.1\ Scanning Method

The patient lies supine or on the left anterior position (in a semilateral position). The probe is placed at left parasternal edge (third to fourth intercostal space) with the beam titling up slightly and pointing the left shoulder on the base of left ventricular long-axis view.

2.21.2\ Section Structure

The structures visualized are the right ventricular infundibulum, pulmonary aortic valve, main pulmonary artery, and left ventricle.

2.21.3\ Measuring Method and Normal Value

The anterior–posterior diameter of right ventricular outflow tract is 22 ± 9 mm.

2.21.4\ The Clinical Application

Right ventricular outflow tract and motion of pulmonary aortic valve and right ventricular wall are the main contents to see in this view.

6  Echocardiography

97

 

 

2.22\ Left Anterior Oblique Position

Left Ventricular (Apical Three-­

Chamber) View

a1

a2

LV

PPM

Ao

LA

DAo

b1

b2

LV

Ao

LA

Fig. 6.26  Left anterior oblique position left ventricular (apical three-chamber) view. (a) Diastole. (b) Systole

2.22.1\ Scanning Method

The patient lies supine or on the left anterior position (in a semilateral position). The probe is placed at the left parasternal edge and the palpable apex of the heart with the beam titling left slightly on the base of right anterior-oblique position left ventricular view.

2.22.2\ Section Structure

The structures visualized are the left ventricle, left atrium, aortic valve, and mitral valve.

2.22.3\ The Clinical Application

In this view, the emphases should be put on the following items: aortic valve annulus, diameter of left ventricular outflow tract, continuity between aortic anterior wall and interventricular septum, thickness and motion of interventricular septum and left ventricular posterior wall, echogenicity, and activity of mitral valve and mitral annulus.