Diagnostic ultrasound ( PDFDrive )

CHAPTER 26 The Extracranial Cerebral Vessels 957
A
B
C
FIG. 26.57 Normal and Abnormal Venous
Waveforms in Three Patients. (A) Brachiocephalic
vein has normal cardiorespiratory change in the venous
waveforms, implying a patent superior vena cava. (B)
Near-occlusive left central brachiocephalic vein stenosis
caused by a prior central venous catheter. Pulsed
Doppler waveform shows reversed nonpulsatile low
in the internal jugular vein (IJV). (C) Left subclavian
vein shows monophasic low with respiratory phasicity
upon snifing.
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