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Measurement of blood flow parameters in the vertebral artery using colour duplex Doppler ultrasound :Johnson, Catherine. Unknown Date (has links)
Thesis (M.App.Sc. in Physiotherapy)--University of South Australia, 1997.
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Primary saphenous vein insufficiency:prospective studies on diagnostic duplex ultrasonography and treatment with endovenous radiofrequency-resistive heatingRautio, T. (Tero) 07 July 2002 (has links)
Abstract
The purpose of the present research was (I-II) to evaluate the effects of
clinical, hand-held Doppler (HHD) and duplex ultrasonographic examinations on the
planning of operative procedure for primary varicose veins, (III) to assess the
feasibility, safety and efficacy of endovenous saphenous vein obliteration with
radiofrequency-resistive heating and (IV) to compare endovenous saphenous vein
obliteration with conventional stripping operation in terms of short-term
recovery and costs.
Sixty-two legs (in 49 consecutive patients) and 142 legs (in 111
consecutive patients) with primary uncomplicated varicose veins were examined
clinically and with HHD and duplex ultrasonography for planning the subsequent
treatment. At the saphenous-femoral junction (SFJ) and at the saphenous-popliteal
junction (SPJ), sensitivity was 56-64% and 23%, specificity 93-97% and 96%,
positive predictive value 97-98% and 43% and negative predictive value 44-45% and
91%, respectively. In 9% of the cases, the treatment plan was modified on the
basis of the duplex ultrasound findings. The present study showed that, in
primary uncomplicated varicose veins, the accuracy of HHD is
unsatisfactory.
Thirty legs of 27 patients with varicose veins were treated using an
endovenous catheter (Closure® System, VNUS Medical Technologies, Inc.,
Sunnyvale,
CA), which was inserted under ultrasound guidance via a percutaneous puncture or
a skin incision. The persistence of vein occlusion and complications potentially
attributable to the endovenous treatment were assessed at 1-week, 6-week,
3-month, 6-month and 1-year follow-up visits. By the time of the last follow-up
visit, occlusion of the treated segment of the LSV had been achieved in 22
(73.3%) legs. Persisting patency or recanalization of LSV was detected in 8 legs
(26.7%). Postoperative complications included saphenous nerve paresthesia in 3
legs (10%) and thermal skin injury in one limb (3.3%).
Twenty-eight selected patients admitted for operative treatment of varicose
veins in the tributaries of the primary long saphenous were randomly assigned to
endovenous obliteration (n = 15) or stripping operation (n = 13). The patients
were followed up for 7-8 weeks postoperatively and examined by duplex
ultrasonography. The comparison of costs included both direct medical costs and
costs due to lost of productivity. All operations were successful, and the
complication rates were similar in the two groups. The sick leaves were
significantly shorter in the endovenous obliteration group [6.5 (SD 3.3) vs. 15.6
(SD 6.0), 95 % CI 5.4 to 12.9, p < 0.001, t-test]. When
the
value of the lost working days was included, the endovenous obliteration was
societally cost-saving.
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Renal Artery Stenosis As Etiology of Recurrent Flash Pulmonary Edema and Role of Imaging in Timely Diagnosis and ManagementBhattad, Pradnya B., Jain, Vinay 09 April 2020 (has links)
Renal hypoperfusion from renal artery stenosis (RAS) activates the renin-angiotensin system, which in turn causes volume overload and hypertension. Atherosclerosis and fibromuscular dysplasia are the most common causes of renal artery stenosis. Recurrent flash pulmonary edema, also known as Pickering syndrome, is commonly associated with bilateral renal artery stenosis. There should be a high index of clinical suspicion for renal artery stenosis in the setting of recurrent flash pulmonary edema and severe hypertension in patients with atherosclerotic disease. Duplex ultrasonography is commonly recommended as the best initial test for the detection of renal artery stenosis. Computed tomography (CT) angiography (CTA) or magnetic resonance (MR) angiography (MRA) are useful diagnostic imaging studies for the detection of renal artery stenosis in patients where duplex ultrasonography is difficult. If duplex ultrasound, CTA, and MRA are indeterminate or pose a risk of significant renal impairment, renal angiography is useful for a definitive diagnosis of RAS. The focus of medical management for RAS relies on controlling renovascular hypertension and aggressive lifestyle modification with control of atherosclerotic disease risk factors. The restoration of renal artery patency by revascularization in the setting of RAS due to atherosclerosis may help in the management of hypertension and minimize renal dysfunction.
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Echo-Enhanced Transcranial Color-Coded Duplexsonography to Study Collateral Blood Flow in Patients with Symptomatic Obstructions of the Internal Carotid Artery and Limited Acoustic Bone WindowsGahn, Georg, Hahn, Gabriele, Hallmeyer-Elgner, Susanne, Kunz, Alexander, Straube, Torsten, Bourquain, Holger, Reichmann, Heinz, Kummer, Rüdiger von 26 February 2014 (has links) (PDF)
We prospectively evaluated 30 consecutive patients with echo-enhanced transcranial color-coded duplexsonography (TCCD) and correlative transfemoral digital subtraction angiography to assess the diagnostic efficacy of echo-enhanced TCCD for evaluation of collateral pathways through the circle of Willis in patients with limited acoustic bone windows and critical symptomatic carotid disease. Echo-enhanced TCCD detected collateral blood flow through the anterior communicating artery in 16 of 18 patients (sensitivity 89%, 95% CI 65–99%) and was false positive in one out of 12 patients without collateral flow (specificity 92%, 95% CI 59–100%). For the posterior communicating artery, sensitivity was 11/14 (79%, 95% CI 49–95%) and specificity was 15/16 (94%, 95% CI 70–100%). Echo-enhanced TCCD enables to study collateral blood flow through the communicating arteries of the circle of Willis with high sensitivity and specificity in patients with obstructions of the internal carotid artery and limited acoustic bone windows. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Echo-Enhanced Transcranial Color-Coded Duplexsonography to Study Collateral Blood Flow in Patients with Symptomatic Obstructions of the Internal Carotid Artery and Limited Acoustic Bone WindowsGahn, Georg, Hahn, Gabriele, Hallmeyer-Elgner, Susanne, Kunz, Alexander, Straube, Torsten, Bourquain, Holger, Reichmann, Heinz, Kummer, Rüdiger von January 2001 (has links)
We prospectively evaluated 30 consecutive patients with echo-enhanced transcranial color-coded duplexsonography (TCCD) and correlative transfemoral digital subtraction angiography to assess the diagnostic efficacy of echo-enhanced TCCD for evaluation of collateral pathways through the circle of Willis in patients with limited acoustic bone windows and critical symptomatic carotid disease. Echo-enhanced TCCD detected collateral blood flow through the anterior communicating artery in 16 of 18 patients (sensitivity 89%, 95% CI 65–99%) and was false positive in one out of 12 patients without collateral flow (specificity 92%, 95% CI 59–100%). For the posterior communicating artery, sensitivity was 11/14 (79%, 95% CI 49–95%) and specificity was 15/16 (94%, 95% CI 70–100%). Echo-enhanced TCCD enables to study collateral blood flow through the communicating arteries of the circle of Willis with high sensitivity and specificity in patients with obstructions of the internal carotid artery and limited acoustic bone windows. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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