Thyroid nodules: Evaluation with power Doppler and duplex Doppler ultrasound

2005 ◽  
Vol 132 (6) ◽  
pp. 874-882 ◽  
Author(s):  
Maria Cristina Chammas ◽  
Renê Gerhard ◽  
Ilka Regina Souza De Oliveira ◽  
Azzo Widman ◽  
Nestor De Barros ◽  
...  
Keyword(s):  
Blood Flow ◽  
Spectral Analysis ◽  
Doppler Ultrasound ◽  
Thyroid Nodules ◽  
Power Doppler ◽  
Multivariate Logistic Regression Analysis ◽  
Resistance Index ◽  
Needle Aspiration ◽  
Duplex Doppler Ultrasound ◽  
Duplex Doppler

This study purposes a new classification of thyroid nodules blood flow by power duplex Doppler ultrasound. A total of 177 nodules were studied with B-mode scanning, power Doppler, and spectral analysis. These data were compared with cytological results from ultrasound-guided fine-needle aspiration biopsy. Univariate and multivariate logistic regression analysis were performed. The power Doppler analysis of the nodules produced 5 vascular patterns: I, absence of signal blood flow; II, exclusively perinodular blood flow; III, perinodular > central blood flow; IV, central blood flow > perinodular blood flow; V, exclusively central blood flow. Statistical analysis revealed a significant relationship between these vascular patterns and cytological results. The spectral analysis demonstrated that the resistance index were higher in nodules with malignant versus other cytology ( P >0.001). The results indicate that power duplex Doppler facilitates screening of thyroid nodules at high risk for malignancy with elevated sensitivity (92.3%) and specificity (88%).

How to carry out monthly blood flow surveillance of fistula in large-scale hemodialysis units: A cross-sectional study

2020 ◽  
pp. 112972982092393
Author(s):  
Ya-wen Mo ◽  
Chun-yan Sun ◽  
Li Song ◽  
Li-fang Zhou ◽  
Ting-ting Zhuang ◽  
...  
Keyword(s):  
Blood Flow ◽  
Arteriovenous Fistula ◽  
Doppler Ultrasound ◽  
Radial Artery ◽  
Brachial Artery ◽  
Dilution Technique ◽  
Cross Sectional ◽  
Duplex Doppler Ultrasound ◽  
Duplex Doppler ◽  
Artery Flow

Background: The important effect of regular blood flow surveillance on arteriovenous fistula maintenance is emphasized. The ultrasonic dilution technique for blood flow surveillance can be performed during hemodialysis, but there are some limitations. Blood flow is traditionally measured by duplex Doppler ultrasound during the nondialysis period. However, the surveillance workload for arteriovenous fistula has increased with the rapid increase in the hemodialysis population size. Efficient methods for blood flow surveillance during hemodialysis are needed. Methods: Eighty-four hemodialysis patients with a forearm radiocephalic arteriovenous fistula were enrolled in this cross-sectional study. Each received blood flow measurements using ultrasonic dilution technique and duplex Doppler ultrasound during hemodialysis. Duplex Doppler ultrasound measurements included the blood flow of the brachial artery and radial artery. The correlations between these variables were analyzed. Results: The correlation coefficients ( r) between flow measured by ultrasonic dilution technique and brachial artery flow measured by duplex Doppler ultrasound, between flow measured by ultrasonic dilution technique and radial artery flow measured by duplex Doppler ultrasound, and between brachial artery flow and radial artery flow measured by duplex Doppler ultrasound were 0.724, 0.784, and 0.749, respectively (all p < 0.001). Conclusion: Blood flow measured by ultrasonic dilution technique was positively correlated with blood flow measured by duplex Doppler ultrasound during hemodialysis, suggesting that duplex Doppler ultrasound can be used to monitor the trends in the blood flow of the brachial artery and radial artery for timely intervention to improve patency during hemodialysis.

Smart Flow for the evaluation of the hemodialysis arteriovenous fistula

2020 ◽  
Vol 21 (5) ◽  
pp. 652-657
Author(s):  
Marco Colucci ◽  
Massimo Torreggiani ◽  
Irene Bernardi ◽  
Simone Stangalino ◽  
Davide Catucci ◽  
...  
Keyword(s):  
Blood Flow ◽  
Doppler Ultrasound ◽  
Duplex Ultrasound ◽  
Chronic Patients ◽  
Flow Measurements ◽  
Additional Information ◽  
Arteriovenous Fistulas ◽  
Duplex Doppler Ultrasound ◽  
Duplex Doppler ◽  
Flow Turbulence

Background: Smart Flow is an innovative tool available on the Carestream Touch Prime Ultrasound machines, which provides automated blood flow measurement and shows the vectors that form the blood flow in the vessel. We compared the use of Smart Flow with traditional Duplex Doppler Ultrasound to evaluate blood flow of arteriovenous fistulas in prevalent hemodialysis patients. Methods: A total of 31 chronic patients on hemodialysis were enrolled. Blood flow was measured on the brachial artery with Smart Flow and duplex Doppler ultrasound. In a subset of 26 patients, a video of the juxta-anastomotic efferent vein was recorded and analyzed to calculate an index of flow turbulence. Results: We enrolled 21 males and 10 females aged 68.52 ± 11.64 years at the time of evaluation with an average arteriovenous fistulas vintage of 50.23 ± 47.42 months and followed them up for 18.03 ± 5.18 months. Smart Flow and Duplex Doppler Ultrasound blood flow measurements positively correlated (p < 0.0001) in the same patient but Smart Flow gave higher blood flow values (995.0 vs 730.3 mL/min, p < 0.0001), and the Duplex Doppler Ultrasound blood flow standard deviation was similar to Smart Flow (125.4 vs 114.4 mL/min, p < 0.0001). The time needed to evaluate arteriovenous fistulas with Smart Flow was significantly shorter than Duplex Doppler Ultrasound (67.58 ± 19.89 vs 146.3 ± 26.35 s, p < 0.0001). No correlation was found between blood flow turbulence and the subsequent access failure. Conclusion: Smart Flow is reliable, reproducible, and faster than traditional duplex ultrasound. However, the additional information given by the Smart Flow technique does not seem to add any further benefits in terms of prediction of the access failure.

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