By Edward I. Bluth

ISBN-10: 1588906108

ISBN-13: 9781588906106

ISBN-10: 1604064684

ISBN-13: 9781604064681

ISBN-10: 3131291427

ISBN-13: 9783131291424

Ultrasonography in Vascular illnesses: a realistic method of scientific difficulties is a concise consultant to the newest medical functions of ultrasound in diagnosing ...

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Additional info for Ultrasonography in vascular diseases: a practical approach to clinical problems

Sample text

Biphasic or triphasic waveform 3. Reverse flow waveform component present Pre-/poststenosis 1. Waveforms and flow velocity normal prestenosis 2. Disturbed flow immediately beyond stenosis. Normal waveforms farther distal to stenosis Severe stenosis (50–75% diameter reduction) Within stenosis 1. PSV Ն 2 times prestenotic PSV 2. Reverse component absent 3. End diastolic velocity < prestenotic PSV Pre-/poststenosis 1. Possible reduced velocity pre- and poststenosis (due to flow reduction) 2. Disturbed flow immediately poststenosis 3.

3–11). Blood flow direction is always toward the region of lower pressures such that arterial blood flow preferentially shunts into the vein. Because the venous pressure is lower, this results in the loss of the high-resistance triphasic waveform in the artery proximal to the fistulous communication (Fig. 3–12). If a large enough component of the blood flow is diverted into the fistula, there may be decreased blood flow in the distal artery, as well as increased pulsatile blood flow in the vein proximal to the communication (Fig.

Although these inflamed lymph nodes might be mistaken for a partially thrombosed PSA, they do not demonstrate characteristic to-and-fro waveforms. qxd 38 8/16/07 2:13 PM Page 38 Ultrasonography in Vascular Diseases A B C D E Figure 3–15 (A) Color Doppler ultrasound of the right groin performed with low-flow detection color Doppler settings (arrow) shows a large-color Doppler speckling mass (M) in the region of a palpable bruit. The arteriovenous (AV) communication is obscured by the large soft tissue color Doppler bruit.

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Ultrasonography in vascular diseases: a practical approach to clinical problems by Edward I. Bluth

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