Abdominal Doppler TEST| 130 QUESTIONS| WITH COMPLETE SOLUTIONS

Size of the abdominal arteries CORRECT ANSWERS: Aorta: 2-2.5cm Celiac: .7cm SMA: .6cm IMA: .3cm Renal arteries: .4-.5cm Doppler spectrum CORRECT ANSWERS: time-velocity waveform that represents variation in intravascular blood flow velocities during the cardiac cycle In a doppler spectra, what's represented along the horizontal axis vs. vertical axis CORRECT ANSWERS: horizontal - time vertical - frequency shift (velocity) What does the intensity or brightness of the spectral line represent? CORRECT ANSWERS: the # of RBCs that are reflecting the ultrasound beam at each velocity The width of the spectral line represents CORRECT ANSWERS: the range of velocities w/in a vessel The width varies during the normal cardiac cycle CORRECT ANSWERS: narrowing during systole widening in diastole Spectral window CORRECT ANSWERS: the clear black zone b/w the spectral line and the baseline Spectral broadening CORRECT ANSWERS: widening of the spectral line and filling of the spectral window When is spectral broadening normally seen? CORRECT ANSWERS: in the presence of high flow velocity, at the branching of a vessel, or in small-diameter vessels Pulsed Doppler spectrum - turbulent flow CORRECT ANSWERS: - filling in of the "window" beneath the spectrum and indicative of the wide range of velocities present - peak systolic velocity is elevated (300 cm/sec) because of a stenosis - may be bidirectional The normal Doppler flow pattern in the infrarenal aorta is that of CORRECT ANSWERS: plug flow Typical flow in aorta and iliac arteries CORRECT ANSWERS: - high resistance with a sharp increase in antegrade flow velocity during systole - rapid decrease that bottoms out in early diastole with a brief period