By Edward I. Bluth
Ultrasonography in Vascular illnesses: a realistic method of scientific difficulties is a concise consultant to the newest medical functions of ultrasound in diagnosing ...
summary: Ultrasonography in Vascular illnesses: a pragmatic method of scientific difficulties is a concise advisor to the most recent scientific functions of ultrasound in diagnosing
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Additional info for Ultrasonography in vascular diseases: a practical approach to clinical problems
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.
Ultrasonography in vascular diseases: a practical approach to clinical problems by Edward I. Bluth