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434 A.A. Baschat<br />

Fig. 29.6. The fetal heart shows the course of the coronary<br />

sinus in the right lateral four-chamber view. The coronary<br />

sinus runs in the atrioventricular groove and opens into<br />

the right atrium near the atrioventricular valve, in close<br />

proximity to the inferior vena cava (IVC) and foramen ovale<br />

(FO). In this imaging plane, the direction of blood flow is<br />

towards the transducer beam. (From [47])<br />

Fig. 29.7. The fetal heart imaged in the apical four-chamber<br />

view shows the left and right ventricles (LV and RV)<br />

and the corresponding atria (LA and RA). The coronary sinus<br />

runs in the atrioventricular groove parallel to the mitral<br />

valve leaflets. The coronary sinus is visualized by tilting the<br />

transducer towards the inferior cardiac surface until the<br />

valve leaflets disappear. (From [45])<br />

Fig. 29.8. The fetal heart imaged in an apical four-chamber<br />

view at 28Ô4 weeks' gestation. The coronary sinus (arrows)<br />

can be seen running in the atrioventricular groove between<br />

the left ventricle (LV) and atrium. Using the cineloop<br />

technique a difference in diameter between end-systolic<br />

(A) and mid-systolic (B) diameters can be appreciated.<br />

M-mode tracing obtained from a normal coronary sinus at<br />

29 weeks' gestation demonstrating fluctuations during systole<br />

and diastole (C). The cursors are placed on the anterior<br />

and posterior walls of the coronary sinus. (From [45])

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