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Applying spectral Doppler to the renal artery and selected interlobular arteries, peak systolic velocities, resistive index, and acceleration curves can be estimated (Figure 4) (e.g., peak systolic velocity of the renal artery above 180 cm/s is a predictor of renal artery stenosis of more than 60%, and a resistive index, which is a calculated ...
The use of ultrasonography in a medical application was first used in the late 1940s in the United States. This use was soon followed in other countries with further research and development being carried out. The first report on Doppler ultrasound as a diagnostic tool for vascular disease was published in 1967–1968.
Unlike arterial ultrasonography, venous ultrasonography is carried out with the probe in a transversal position, (perpendicular to the vein axis), displaying cross-sections of the veins. [4] All collateral veins are better detected this way, including perforator veins, but of most importance is the detection of venous thrombosis.
A Doppler ultrasound blood flow detector, commonly called Doppler wand or Doppler probe, and a sphygmomanometer (blood pressure cuff) are usually needed. The blood pressure cuff is inflated proximal to the artery in question. Measured by the Doppler wand, the inflation continues until the pulse in the artery ceases.
Invasive venography can be used in patients who may require surgery or have suspicion of venous stenosis. Other modalities that may be employed are: ankle-brachial index to exclude arterial pathology, air or photoplethysmography, intravascular ultrasound, and ambulatory venous pressures, which provides a global assessment of venous competence.
Vasculitis, peripheral arterial vascular disease, and lower extremity chronic venous insufficiency are the most frequent conditions to be taken into account during the differential diagnosis process. Peripheral artery diseases are diagnosed with the help of clinical signs, abnormal arterial Doppler ultrasound findings, and the ankle-brachial ...
An occlusion of the artery would be seen by decreased or absent flow distal to the occlusion. Doppler ultrasound can even distinguish between embolic and thrombotic plaque. The former would show a delineated, round thrombus, whereas the latter would show narrowed arterial lumen with atherosclerotic plaque. [2]
A peripheral vascular examination is a medical examination to discover signs of pathology in the peripheral vascular system. It is performed as part of a physical examination, or when a patient presents with leg pain suggestive of a cardiovascular pathology. The exam includes several parts: Position/lighting/draping; Inspection; Palpation ...
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