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Kortenbout AJ, Costerus S, Dudink J, de Jong N, de Graaff JC, Vos HJ, Bosch JG. Automatic Max-Likelihood Envelope Detection Algorithm for Quantitative High-Frame-Rate Ultrasound for Neonatal Brain Monitoring. Ultrasound Med Biol 2024; 50:434-444. [PMID: 38143187 DOI: 10.1016/j.ultrasmedbio.2023.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 11/07/2023] [Accepted: 12/03/2023] [Indexed: 12/26/2023]
Abstract
OBJECTIVE Post-operative brain injury in neonates may result from disturbed cerebral perfusion, but accurate peri-operative monitoring is lacking. High-frame-rate (HFR) cerebral ultrasound could visualize and quantify flow in all detectable vessels using spectral Doppler; however, automated quantification in small vessels is challenging because of low signal amplitude. We have developed an automatic envelope detection algorithm for HFR pulsed wave spectral Doppler signals, enabling neonatal brain quantitative parameter maps during and after surgery. METHODS HFR ultrasound data from high-risk neonatal surgeries were recorded with a custom HFR mode (frame rate = 1000 Hz) on a Zonare ZS3 system. A pulsed wave Doppler spectrogram was calculated for each pixel containing blood flow in the image, and spectral peak velocity was tracked using a max-likelihood estimation algorithm of signal and noise regions in the spectrogram, where the most likely cross-over point marks the blood flow velocity. The resulting peak systolic velocity (PSV), end-diastolic velocity (EDV) and resistivity index (RI) were compared with other detection schemes, manual tracking and RIs from regular pulsed wave Doppler measurements in 10 neonates. RESULTS Envelope detection was successful in both high- and low-quality arterial and venous flow spectrograms. Our technique had the lowest root mean square error for EDV, PSV and RI (0.46 cm/s, 0.53 cm/s and 0.15, respectively) when compared with manual tracking. There was good agreement between the clinical pulsed wave Doppler RI and HFR measurement with a mean difference of 0.07. CONCLUSION The max-likelihood algorithm is a promising approach to accurate, automated cerebral blood flow monitoring with HFR imaging in neonates.
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Affiliation(s)
- Anna J Kortenbout
- Biomedical Engineering, Department of Cardiology, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands
| | - Sophie Costerus
- Department of Pediatric Surgery, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands
| | - Jeroen Dudink
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Nico de Jong
- Biomedical Engineering, Department of Cardiology, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands; Department of Imaging Physics, Medical Imaging, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands
| | - Jurgen C de Graaff
- Department of Anesthesiology, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands; Department of Anesthesiology, Erasmus MC, Goes, The Netherlands; Department of Anesthesiology, Weill Cornell Medicine, New York, NY, USA
| | - Hendrik J Vos
- Biomedical Engineering, Department of Cardiology, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands; Department of Imaging Physics, Medical Imaging, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands
| | - Johan G Bosch
- Biomedical Engineering, Department of Cardiology, University Medical Center Rotterdam, Erasmus MC, Rotterdam, The Netherlands.
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Fadel BM, Kazzi B, Mohty D. Ultrasound Imaging of the Superior Vena Cava: A State-of-the-Art Review. J Am Soc Echocardiogr 2023:S0894-7317(23)00072-X. [PMID: 36754099 DOI: 10.1016/j.echo.2023.01.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/28/2023] [Accepted: 01/30/2023] [Indexed: 02/10/2023]
Abstract
Greater interest in imaging the superior vena cava (SVC) in recent years has arisen because of increased focus on disorders of the right heart; the growing use of transvenous access lines, dialysis catheters, and device leads; and the emergence of right ventricular mechanical circulatory support systems via the transcatheter approach. As a low-pressure venous conduit in the right upper mediastinum, the SVC is prone to compression by various pathologic processes, to invasion by malignancies originating in nearby structures, and to complications arising from intraluminal device leads and indwelling catheters. Computed tomography and magnetic resonance venography are the modalities of choice for structural imaging of the SVC. Ultrasound allows a reasonable, yet less detailed anatomic assessment of this venous conduit. Spectral and color Doppler imaging by ultrasound are the most valuable noninvasive tools for the interrogation of SVC blood flow, a marker of the filling pattern of the right heart. Analysis of the velocity, duration, and direction of the Doppler waveforms and their phasic response to respiration makes it possible to distinguish normal from abnormal flow patterns and offers diagnostic insights into disorders that affect right heart function. The aims of this review are to demonstrate the added value SVC imaging provides during transthoracic and transesophageal echocardiographic studies, to outline its usefulness for the detection and evaluation of structural abnormalities, and to detail the role of spectral Doppler imaging in aiding the diagnosis of various disorders that affect the right heart.
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3
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Silva VBC, Froes TR, Wolf M, Lucina SB, Sousa MG. Characterization of Doppler spectrum of hepatic veins in dogs with pulmonary hypertension. Res Vet Sci 2022; 150:131-136. [PMID: 35820267 DOI: 10.1016/j.rvsc.2022.06.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 03/27/2022] [Accepted: 06/21/2022] [Indexed: 11/19/2022]
Abstract
Pulmonary hypertension (PH) triggers hemodynamic changes within the right heart, which may affect hepatic venous flow. The aims of this study were three-fold: to investigate, prospectively, the reliability of the hepatic vein Doppler waveform to diagnose and characterize the magnitude of PH in dogs; to evaluate whether a correlation exists between hepatic venous flow waves and the structural and functional characteristics of the right ventricle (RV); and to determine whether age, gender, body weight, heart rate (HR), heart rhythm and systolic blood pressure affect the hepatic venous waveform pattern. A cross-sectional observational study was carried out in 43 dogs with varying degrees of PH and a control group of 15 healthy dogs. The velocities of the hepatic A, S, V and D spectral waves and the phasic pattern varied according to the severity of PH. Weak to moderate correlations were documented between hepatic vein waves and age, HR, and the structural and functional variables of the RV. A D Wave cut-off of 11.6 cm ∙ s-1 had a sensitivity of 100% and specificity of 35% for differentiation of dogs with severe PH from healthy dogs. Doppler assessment of hepatic venous flow was shown to be a reliable technique for screening dogs for PH.
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Affiliation(s)
- V B C Silva
- Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná 80035-050, Brazil.
| | - T R Froes
- Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná 80035-050, Brazil
| | - M Wolf
- Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná 80035-050, Brazil
| | - S B Lucina
- Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná 80035-050, Brazil
| | - M G Sousa
- Laboratory of Comparative Cardiology, Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná 80035-050, Brazil
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Bakhshandeh T, Maleknejad A, Sargolzaie N, Mashhadi A, Zadehmir M. The utility of spectral Doppler evaluation of acute appendicitis. Emerg Radiol 2022; 29:371-375. [PMID: 35013851 DOI: 10.1007/s10140-021-02010-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 12/07/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE The use of spectral Doppler, peak systolic velocity (PSV), and resistive index (RI) imaging criteria to improve the accuracy of acute appendicitis diagnosis is hypothesized. METHODS Graded compression ultrasound was performed for suspected patients. The spectral Doppler evaluation was conducted while observing the appendix. A total of 152 patients (82 males and 70 females, ages 4-63 years, mean age of 24.5 years) were examined using the spectral Doppler waveform between 2018 and 2019. RI and PSV values of patients with and without appendicitis were compared to histopathologic findings. SPSS 26 was used to analyze the data, including using descriptive statistics and measures of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). RESULTS Appendicitis was confirmed in 95 patients (62.5%) and rejected in 57 patients (37.5%). For the diagnosis of appendicitis, the area under the curve (AUC) of receiver operating characteristic (ROC) for RI (0.92 with 95% confidence interval (CI): 0.88, 0.97; P = 0.001) and PSV (0.96, with 95% CI: 0.93, 1.00; P = 0.001) was calculated. The discriminatory RI ≥ 0.49 demonstrated high sensitivity (90.5%) and low specificity (86%), and the discriminatory PSV ≥ 9.6 cm/s had high specificity (94.7%) and sensitivity (94.7%) for appendicitis. CONCLUSION By incorporating spectral Doppler criteria into routine graded compression ultrasound, the diagnostic accuracy of acute appendicitis was increased. In comparison, high PSV and RI values of the appendix with a cut-off point of 9.6 cm/s and 0.49 differ significantly between positive and negative appendectomy patients.
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Affiliation(s)
- Tahereh Bakhshandeh
- Department of Radiology, Torbat Heydarieh University of Medical Sciences, Torbat Heydarieh, Iran
| | - Abdulbaset Maleknejad
- Department of Surgery, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Narges Sargolzaie
- Community Medicine Department, Medical School, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Amin Mashhadi
- Department of Radiology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Mohadeseh Zadehmir
- Department of Radiology, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran.
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Peixoto AB, Bravo-Valenzuela NJM, Mattar R, Moron AF, da Silva Pares DB, Tonni G, Araujo Júnior E. Reference values for left and right ventricular systolic-to-diastolic duration ratio (SDR) found using both spectral and tissue Doppler of fetal heart between 20 and 36+6 weeks of gestation. Int J Cardiovasc Imaging 2021; 37:2717-26. [PMID: 33844115 DOI: 10.1007/s10554-021-02239-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 04/03/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE To establish reference values for the systolic-to-diastolic duration ratio (SDR) of the left ventricle (LV) using spectral Doppler, as well as for the SDR' of the interventricular septum (SEP), LV, and right ventricles (RV) using tissue Doppler of the fetal heart. METHOD This prospective and cross-sectional study evaluated 374 low-risk singleton pregnancies from 20 to 36 + 6 weeks of gestation. The ventricular filling time (FT) was obtained from LV inflow using spectral Doppler. Tissue Doppler was used to assess the FT of each ventricle by placing the cursor at the atrioventricular junction marked by the mitral and tricuspid valves, respectively. SDR was calculated as the sum of the isovolumic contraction time (ICT) and the ejection time (ET) divided by the sum of the isovolumic relaxation time (IRT) and the ventricular FT. We used regression analysis to obtain the best-fit model polynomial equation for the parameters. The concordance correlation coefficient (CCC) was used to assess intra- and inter-observer reproducibility. RESULTS SDR and SDR' LV showed a progressive decrease with gestational age (GA); the SDR' RV and SDR' SEP did not show a significant decrease with advancing GA. The SDR LV (r = 0.29, p < 0.0001), SDR' RV (r = 0.21, p < 0.0001), SDR' LV (r = 0.20, p = 0.0001), and SDR' SEP (r = 0.25, p < 0.0001) showed a significant weak positive correlation with fetal heart rate. The inter-observer SDR' SEP measurements demonstrated poor reproducibility (CCC: 0.50), whereas intra-observer SRD LV measurements demonstrated moderate reproducibility (CCC: 0.78). CONCLUSIONS Reference values for SDR SEP, LV, and RV using spectral and tissue Doppler of fetal heart were established between 20 and 36+6 weeks of gestation.
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Peixoto AB, Bravo-Valenzuela NJM, Martins WP, Słodki M, Mattar R, Moron AF, Araujo Júnior E. Impact of type I and type II maternal diabetes mellitus on fetal cardiac function assessment parameters using spectral and tissue Doppler. Int J Cardiovasc Imaging 2020; 36:1237-1247. [PMID: 32232625 DOI: 10.1007/s10554-020-01821-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 03/19/2020] [Indexed: 11/26/2022]
Abstract
The aim of this study was to evaluate the impact of pregestational diabetes mellitus (DM) on fetal cardiac function two-dimensional parameters using spectral and tissue Doppler. Pregnant women between 20 and 36 + 6 weeks gestation were divided into three groups: controls, type I DM, and type II DM. The right ventricle (RV) and left ventricle (LV) annular velocity peaks were measured using spectral (E, A) and tissue (E', A', S') Doppler. The myocardial performance index was calculated as (isovolumetric contraction time [ICT] + isovolumetric relaxation time [IRT])/ejection time using tissue (MPI') and the spectral Doppler (MPI). A general linear model, with fetal heart rate as a covariant, was used to evaluate the effect of DM on the fetal heart function assessment parameters. To assess the association of type I and II DM with adverse perinatal outcomes, Fisher's exact test was used. A receiver operating characteristic curve was used to determine the best cutoff for fetal cardiac function assessment parameters to identify the neonatal composite outcomes. The sample comprised 179 pregnant women. DM had significant effect on RV and LV A peak velocities (p = 0.026 and p = 0.011, respectively). LV ICT (p < 0.001) and LV MPI (p < 0.001) were significantly affected by maternal DM. Fetuses from pregnant women with type II DM showed significantly higher LV MPI (0.492 vs. 0.459, p = 0.006) and RV S' (7.2 vs. 6.44 cm/s, p = 0.024) than controls. Fetuses from type I DM pregnant women showed increase in cardiac parameters that evaluated the LV and RV diastolic function (LV IRT' p < 0.001 and RV MPI' p = 0.044). Type I and II DM were associated with adverse perinatal outcomes: neonatal intensive care unit stay (p < 0.0001), macrosomia (p < 0.0001), hyperbilirubinemia (p < 0.0001), and hypoglycemia (p < 0.0001). The LV MPI' showed significant but moderate sensitivity in identifying the composite neonatal outcomes (AUC: 0.709, 95% CI 0.629-0.780, p < 0.001). Tissue Doppler and MPI parameters can be useful to detect subclinical cardiac dysfunction in the fetal heart of pregestational DM pregnant women.
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Affiliation(s)
- Alberto Borges Peixoto
- Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM- UNIFESP), Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo, SP, CEP 05089-030, Brazil
- Gynecology and Obstetrics Service, Mario Palmério University Hospital - University of Uberaba (UNIUBE), Uberaba, MG, Brazil
- Department of Obstetrics and Gynecology, Federal University of Triângulo Mineiro (UFTM), Uberaba, MG, Brazil
| | - Nathalie Jeanne Magioli Bravo-Valenzuela
- Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM- UNIFESP), Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo, SP, CEP 05089-030, Brazil
| | | | - Maciej Słodki
- Department of Prenatal Cardiology, Polish Mother Memorial Hospital Research Institute, Łódż, Poland
| | - Rosiane Mattar
- Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM- UNIFESP), Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo, SP, CEP 05089-030, Brazil
| | - Antonio Fernandes Moron
- Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM- UNIFESP), Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo, SP, CEP 05089-030, Brazil
| | - Edward Araujo Júnior
- Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM- UNIFESP), Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo, SP, CEP 05089-030, Brazil.
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Abstract
Doppler ultrasound (US) is the primary noninvasive imaging modality for detecting, grading, and monitoring extracranial internal carotid artery (ICA) stenosis, which is a well-established surrogate marker for stroke risk. In addition, Doppler US is the primary imaging modality for surveillance of patients following carotid intervention with endarterectomy or stent placement. This article reviews the pathophysiology and epidemiology of stroke, technique for performing a carotid US examination, normal findings, and diagnostic US criteria for evaluating carotid plaque, grading stenosis in the native ICA and following intervention, as well as waveform analysis of the carotid arteries.
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Affiliation(s)
- Leslie M Scoutt
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, 333 Cedar Street, PO Box 208042, New Haven, CT 06520-8042, USA.
| | - Gowthaman Gunabushanam
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, 333 Cedar Street, PO Box 208042, New Haven, CT 06520-8042, USA
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Waelti SL, Rypens F, Damphousse A, Powell J, Soulez G, Messerli M, Dubois J. Ultrasound findings in rapidly involuting congenital hemangioma (RICH) - beware of venous ectasia and venous lakes. Pediatr Radiol 2018; 48:586-593. [PMID: 29362838 DOI: 10.1007/s00247-017-4042-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 10/12/2017] [Accepted: 11/16/2017] [Indexed: 11/26/2022]
Abstract
BACKGROUND Bleeding, ulceration and cardiac failure can occur in rapidly involuting congenital hemangioma (RICH). Bleeding intensity ranges from superficial to life-threatening. OBJECTIVE To determine whether there are sonographic criteria associated with an increased risk of bleeding, ulceration or cardiac failure in RICH in order to identify children who need close monitoring or prophylactic treatment. MATERIALS AND METHODS This retrospective single-center study included RICH patients over a period of 13 years. We evaluated sonographic features of RICH on B-mode and Doppler ultrasound. We correlated the occurrence of bleeding, ulceration and cardiac failure with four sonographic findings: (1) visible vessel, (2) venous ectasia, (3) venous lake and (4) arteriovenous shunting. RESULTS We included 24 patients. Ulceration occurred in five cases, bleeding in four cases, one of which was life-threatening. Cardiac failure was observed more frequently in RICH with venous lakes (P=0.028). Bleeding and ulceration appeared more frequently in RICH with venous ectasia and venous lakes. Cardiac failure was associated with the presence of venous ectasia. All children with cardiac failure or ulceration had arteriovenous shunts. CONCLUSION RICH with venous lakes on ultrasound is prone to develop bleeding, cardiac failure and ulceration. This association was only significant for cardiac failure.
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Affiliation(s)
- Stephan L Waelti
- Department of Medical Imaging, Sainte Justine Hospital, University of Montreal, 3175 Cote-Sainte-Catherine Road, Montreal, QC, H3T 1C5, Canada
| | - Françoise Rypens
- Department of Medical Imaging, Sainte Justine Hospital, University of Montreal, 3175 Cote-Sainte-Catherine Road, Montreal, QC, H3T 1C5, Canada
| | - Amélie Damphousse
- Department of Medical Imaging, Sainte Justine Hospital, University of Montreal, 3175 Cote-Sainte-Catherine Road, Montreal, QC, H3T 1C5, Canada
| | - Julie Powell
- Department of Dermatology, Sainte Justine Hospital, University of Montreal, 3175 Cote-Sainte-Catherine Road, Montreal, QC, H3T 1C5, Canada
| | - Gilles Soulez
- Department of Medical Imaging, University of Montreal Medical Center, Montreal, QC, Canada
| | - Michael Messerli
- Department of Nuclear Medicine, Cardiac Imaging, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Josée Dubois
- Department of Medical Imaging, Sainte Justine Hospital, University of Montreal, 3175 Cote-Sainte-Catherine Road, Montreal, QC, H3T 1C5, Canada.
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Mahmoud OA, Mahmoud MZ. Spectral Doppler findings in a rare case of acute compartment syndrome following leg burn. Radiol Case Rep 2018; 13:352-5. [PMID: 29904471 DOI: 10.1016/j.radcr.2018.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/04/2018] [Indexed: 01/11/2023] Open
Abstract
Acute compartment syndrome (ACS) is an orthopedic emergency condition, which is rarely attributed to burns. It occurs when pressure in an enclosed space rises to a point where it reduces blood flow and impairs tissue perfusion. Its consequences often lead to ischemia and possible necrosis within that space. Until now, the use of Doppler assessment to explore different types of compartment syndrome has yielded contradictory findings. Here, we present a significant increase of blood flow velocity in the arteries proximal to the burned area. Thus, the combination of Duplex ultrasound results with clinical findings will help vascular surgeons to make immediate decision to perform fasciotomy.
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Bechsgaard T, Hansen KL, Brandt AH, Holbek S, Forman JL, Strandberg C, Lönn L, Bækgaard N, Jensen JA, Nielsen MB. Vector and Doppler Ultrasound Velocities Evaluated in a Flow Phantom and the Femoropopliteal Vein. Ultrasound Med Biol 2017; 43:2477-2487. [PMID: 28750944 DOI: 10.1016/j.ultrasmedbio.2017.06.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 06/16/2017] [Accepted: 06/19/2017] [Indexed: 06/07/2023]
Abstract
Ultrasound is used for evaluating the veins of the lower extremities. Operator and angle dependency limit spectral Doppler ultrasound (SDUS). The aim of the study was to compare peak velocity measurements in a flow phantom and the femoropopliteal vein of 20 volunteers with the angle-independent vector velocity technique vector flow imaging (VFI) and SDUS. In the flow phantom, VFI underestimated velocity (p = 0.01), with a lower accuracy of 5.5% (p = 0.01) and with no difference in precision, that is, error factor, compared with SDUS (VFI: 1.02 vs. SDUS: 1.02, p = 0.58). In vivo, VFI estimated lower velocities (femoral: p = 0.001; popliteal: p = 0.001) with no difference in precision compared with SDUS (femoral: VFI 1.09 vs. SDUS 1.14, p = 0.37; popliteal: VFI 1.13 vs. SDUS 1.06, p = 0.09). In conclusion, the precise VFI technique can be used to characterize venous hemodynamics of the lower extremities despite its underestimation of velocities.
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Affiliation(s)
- Thor Bechsgaard
- Department of Radiology, University Hospital of Copenhagen, Rigshospitalet, Copenhagen, Denmark.
| | | | - Andreas Hjelm Brandt
- Department of Radiology, University Hospital of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Simon Holbek
- Center for Fast Ultrasound Imaging, Department of Electrical Engineering, Technical University of Denmark, Lyngby, Denmark
| | - Julie Lyng Forman
- Section of Biostatistics, Department of Public Health, Copenhagen University, Copenhagen, Denmark
| | - Charlotte Strandberg
- Department of Radiology, University Hospital of Copenhagen, Herlev & Gentofte Hospital, Hellerup, Denmark
| | - Lars Lönn
- Department of Radiology, University Hospital of Copenhagen, Rigshospitalet, Copenhagen, Denmark
| | - Niels Bækgaard
- Department of Vascular Surgery, University Hospital of Copenhagen, Rigshospitalet & Gentofte Hospital, Hellerup, Denmark
| | - Jørgen Arendt Jensen
- Center for Fast Ultrasound Imaging, Department of Electrical Engineering, Technical University of Denmark, Lyngby, Denmark
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Tortoli P, Lenge M, Righi D, Ciuti G, Liebgott H, Ricci S. Comparison of carotid artery blood velocity measurements by vector and standard Doppler approaches. Ultrasound Med Biol 2015; 41:1354-1362. [PMID: 25722028 DOI: 10.1016/j.ultrasmedbio.2015.01.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 12/22/2014] [Accepted: 01/16/2015] [Indexed: 06/04/2023]
Abstract
Although severely affected by the angle dependency, carotid artery peak systolic velocity measurements are widely used for assessment of stenosis. In this study, blood peak systolic velocities in the common and internal carotid arteries of both healthy volunteers and patients with internal carotid artery stenosis were measured by two vector Doppler (VD) methods and compared with measurements obtained with the conventional spectral Doppler approach. Although the two VD techniques were completely different (using the transmission of focused beams and plane waves, respectively), the measurement results indicate that these techniques are nearly equivalent. The peak systolic velocities measured in 22 healthy common carotid arteries by the two VD techniques were very close (according to Bland-Altman analysis, the average difference was 3.2%, with limits of agreement of ± 8.6%). Application of Bland-Altman analysis to comparison of either VD technique with the spectral Doppler method provided a 21%-25% average difference with ± 13%-15% limits of agreement. Analysis of the results obtained from 15 internal carotid arteries led to similar conclusions, indicating significant overestimation of peak systolic velocity with the spectral Doppler method. Inter- and intra-operator repeatability measurements performed in a group of 8 healthy volunteers provided equivalent results for all of the methods (coefficients of variability in the range 2.7%-6.9%), even though the sonographers were not familiar with the VD methods. The results of this study suggest that the introduction of vector Doppler methods in commercial machines may finally be considered mature and capable of overcoming the angle-dependent overestimation typical of the standard spectral Doppler approach.
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Affiliation(s)
- Piero Tortoli
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy.
| | - Matteo Lenge
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy; CREATIS, Université de Lyon 1, CNRS UMR 5220, INSERM U1044, INSA, Lyon, France
| | - Daniele Righi
- Heart and Vessels Department, AOU Careggi, Florence, Italy
| | - Gabriele Ciuti
- Heart and Vessels Department, AOU Careggi, Florence, Italy
| | - Hervé Liebgott
- CREATIS, Université de Lyon 1, CNRS UMR 5220, INSERM U1044, INSA, Lyon, France
| | - Stefano Ricci
- Department of Information Engineering, Università degli Studi di Firenze, Florence, Italy
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12
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Xu T, Hozan M, Bashford GR. In vivo lateral blood flow velocity measurement using speckle size estimation. Ultrasound Med Biol 2014; 40:931-937. [PMID: 24462149 DOI: 10.1016/j.ultrasmedbio.2013.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 11/12/2013] [Accepted: 11/18/2013] [Indexed: 06/03/2023]
Abstract
In previous studies, we proposed blood measurement using speckle size estimation, which estimates the lateral component of blood flow within a single image frame based on the observation that the speckle pattern corresponding to blood reflectors (typically red blood cells) stretches (i.e., is "smeared") if blood flow is in the same direction as the electronically controlled transducer line selection in a 2-D image. In this observational study, the clinical viability of ultrasound blood flow velocity measurement using speckle size estimation was investigated and compared with that of conventional spectral Doppler of carotid artery blood flow data collected from human patients in vivo. Ten patients (six male, four female) were recruited. Right carotid artery blood flow data were collected in an interleaved fashion (alternating Doppler and B-mode A-lines) with an Antares Ultrasound Imaging System and transferred to a PC via the Axius Ultrasound Research Interface. The scanning velocity was 77 cm/s, and a 4-s interval of flow data were collected from each subject to cover three to five complete cardiac cycles. Conventional spectral Doppler data were collected simultaneously to compare with estimates made by speckle size estimation. The results indicate that the peak systolic velocities measured with the two methods are comparable (within ±10%) if the scan velocity is greater than or equal to the flow velocity. When scan velocity is slower than peak systolic velocity, the speckle stretch method asymptotes to the scan velocity. Thus, the speckle stretch method is able to accurately measure pure lateral flow, which conventional Doppler cannot do. In addition, an initial comparison of the speckle size estimation and color Doppler methods with respect to computational complexity and data acquisition time indicated potential time savings in blood flow velocity estimation using speckle size estimation. Further studies are needed for calculation of the speckle stretch method across a field of view and combination with an appropriate axial flow estimator.
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Affiliation(s)
- Tiantian Xu
- Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Mohsen Hozan
- Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Gregory R Bashford
- Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
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