Which location is the pulse wave flow belongs to? What kind of abnormality you can see in this flow sample?
A. Tricuspid valve inflow, complete heart block
B. Pulmonary vein, blunting of systolic forward flow due to high left ventricular filling pressures
C. Hepatic flow, systolic flow reversal due to severe tricuspid regurgitation
D. Left atrial appendage,systolic flow reversal due to severe mitral regurgitation
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