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Shimada E, Zhu M, Kimura S, Streiff C, Houle H, Datta S, Sahn DJ, Ashraf M. Quantitative assessment of mitral inflow and aortic outflow stroke volumes by 3-dimensional real-time full-volume color flow doppler transthoracic echocardiography: an in vivo study. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2015; 34:95-103. [PMID: 25542944 DOI: 10.7863/ultra.34.1.95] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVES Noninvasive quantification of left ventricular (LV) stroke volumes has an important clinical role in assessing circulation and monitoring therapeutic interventions for cardiac disease. This study validated the accuracy of a real-time 3-dimensional (3D) color flow Doppler method performed during transthoracic echocardiography (TTE) for quantifying volume flows through the mitral and aortic valves using a dedicated offline 3D flow computation program compared to LV sonomicrometry in an open-chest animal model. METHODS Forty-six different hemodynamic states in 5 open-chest pigs were studied. Three-dimensional color flow Doppler TTE and 2-dimensional (2D) TTE were performed by epicardial scanning. The dedicated software was used to compute flow volumes at the mitral annulus and the left ventricular outflow tract (LVOT) with the 3D color flow Doppler method. Stroke volumes by 2D TTE were computed in the conventional manner. Stroke volumes derived from sonomicrometry were used as reference values. RESULTS Mitral inflow and LVOT outflow derived from the 3D color flow Doppler method correlated well with stroke volumes by sonomicrometry (R = 0.96 and 0.96, respectively), whereas correlation coefficients for mitral inflow and LVOT outflow computed by 2D TTE and stroke volumes by sonomicrometry were R = 0.84 and 0.86. Compared to 2D TTE, the 3D method showed a smaller bias and narrower limits of agreement in both mitral inflow (mean ± SD: 3D, 2.36 ± 2.86 mL; 2D, 10.22 ± 8.46 mL) and LVOT outflow (3D, 1.99 ± 2.95 mL; 2D, 4.12 ± 6.32 mL). CONCLUSIONS Real-time 3D color flow Doppler quantification is feasible and accurate for measurement of mitral inflow and LVOT outflow stroke volumes over a range of hemodynamic conditions.
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Affiliation(s)
- Eriko Shimada
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - Meihua Zhu
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - Sumito Kimura
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - Cole Streiff
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - Helene Houle
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - Saurabh Datta
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
| | - David J Sahn
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.).
| | - Muhammad Ashraf
- Oregon Health and Science University, Portland, Oregon USA (E.S., M.Z., S.K., C.S., D.J.S., M.A.); and Siemens Medical Solutions USA, Inc, Mountain View, California USA (H.H., S.D.)
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2
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Ficial B, Finnemore AE, Cox DJ, Broadhouse KM, Price AN, Durighel G, Ekitzidou G, Hajnal JV, Edwards AD, Groves AM. Validation study of the accuracy of echocardiographic measurements of systemic blood flow volume in newborn infants. J Am Soc Echocardiogr 2013; 26:1365-71. [PMID: 24075229 PMCID: PMC3852205 DOI: 10.1016/j.echo.2013.08.019] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Indexed: 11/01/2022]
Abstract
BACKGROUND The echocardiographic assessment of circulatory function in sick newborn infants has the potential to improve patient care. However, measurements are prone to error and have not been sufficiently validated. Phase-contrast magnetic resonance imaging (MRI) provides highly validated measures of blood flow and has recently been applied to the newborn population. The aim of this study was to validate measures of left ventricular output and superior vena caval flow volume in newborn infants. METHODS Echocardiographic and MRI assessments were performed within 1 working day of each other in a cohort of newborn infants. RESULTS Examinations were performed in 49 infants with a median corrected gestational age at scan of 34.43 weeks (range, 27.43-40 weeks) and a median weight at scan of 1,880 g (range, 660-3,760 g). Echocardiographic assessment of left ventricular output showed a strong correlation with MRI assessment (R(2) = 0.83; mean bias, -9.6 mL/kg/min; limits of agreement, -79.6 to +60.0 mL/kg/min; repeatability index, 28.2%). Echocardiographic assessment of superior vena caval flow showed a poor correlation with MRI assessment (R(2) = 0.22; mean bias, -13.7 mL/kg/min; limits of agreement, -89.1 to +61.7 mL/kg/min; repeatability index, 68.0%). Calculating superior vena caval flow volume from an axial area measurement and applying a 50% reduction to stroke distance to compensate for overestimation gave a slightly improved correlation with MRI (R(2) = 0.29; mean bias, 2.6 mL/kg/min; limits of agreement, -53.4 to +58.6 mL/kg/min; repeatability index, 54.5%). CONCLUSIONS Echocardiographic assessment of left ventricular output appears relatively robust in newborn infant. Echocardiographic assessment of superior vena caval flow is of limited accuracy in this population, casting doubt on the utility of the measurement for diagnostic decision making.
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Affiliation(s)
- Benjamim Ficial
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Patologia e Terapia Intensiva Neonatale, Università degli Studi di Verona, Verona, Italy
| | - Anna E. Finnemore
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - David J. Cox
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - Kathryn M. Broadhouse
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - Anthony N. Price
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - Giuliana Durighel
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
| | - Georgia Ekitzidou
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
| | - Joseph V. Hajnal
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - A. David Edwards
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
| | - Alan M. Groves
- Imperial College and MRC Clinical Sciences Centre, London, United Kingdom
- Department of Perinatal Imaging and Health, King's College London, London, United Kingdom
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3
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Hoskins PR, Soldan M, Fortune S, Inglis S, Anderson T, Plevris J. Validation of endoscopic ultrasound measured flow rate in the azygos vein using a flow phantom. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:1957-1964. [PMID: 20800953 DOI: 10.1016/j.ultrasmedbio.2010.06.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 06/17/2010] [Accepted: 06/24/2010] [Indexed: 05/29/2023]
Abstract
Increase in flow rate within the azygos vein may be used as an indicator of the degree of liver cirrhosis. The aim of this study was to evaluate the error in measurement of flow rate using a commercial endoscopic ultrasound system, using a flow phantom that mimicked azygos vein depth, diameter and flow rate. Diameter was underestimated in all cases, with an average underestimation of 0.09 cm. Maximum velocity was overestimated, by 4 ± 4% at 50°, 11 ± 3% at 60° and 23 ± 7% at 70°. The increase in error with beam-vessel angle is consistent with the error as arising from geometric spectral broadening. Flow was underestimated by amounts up to 33%, and it is noted that the overestimation caused by geometric spectral broadening is in part compensated by underestimation of diameter. It was concluded that measurement of flow rate using a commercially available endoscopic ultrasound system is dependent on the beam-vessel angle, with errors up to 33% for typical vessel depths, diameter and beam-vessel angle.
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Affiliation(s)
- Peter R Hoskins
- Medical Physics Department, University of Edinburgh, Edinburgh, United Kingdom.
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4
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Shahgaldi K, Manouras A, Brodin LÅ, Winter R. Direct Measurement of Left Ventricular Outflow Tract Area Using Three-Dimensional Echocardiography in Biplane Mode Improves Accuracy of Stroke Volume Assessment. Echocardiography 2010; 27:1078-85. [DOI: 10.1111/j.1540-8175.2010.01197.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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5
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Prager RW, Ijaz UZ, Gee AH, Treece GM. Three-dimensional ultrasound imaging. Proc Inst Mech Eng H 2010; 224:193-223. [PMID: 20349815 DOI: 10.1243/09544119jeim586] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This review is about the development of three-dimensional (3D) ultrasonic medical imaging, how it works, and where its future lies. It assumes knowledge of two-dimensional (2D) ultrasound, which is covered elsewhere in this issue. The three main ways in which 3D ultrasound may be acquired are described: the mechanically swept 3D probe, the 2D transducer array that can acquire intrinsically 3D data, and the freehand 3D ultrasound. This provides an appreciation of the constraints implicit in each of these approaches together with their strengths and weaknesses. Then some of the techniques that are used for processing the 3D data and the way this can lead to information of clinical value are discussed. A table is provided to show the range of clinical applications reported in the literature. Finally, the discussion relating to the technology and its clinical applications to explain why 3D ultrasound has been relatively slow to be adopted in routine clinics is drawn together and the issues that will govern its development in the future explored.
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Affiliation(s)
- R W Prager
- Department of Engineering, University of Cambridge, Cambridge, UK.
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6
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Garcia D, Fenech M, Qin Z, Soulez G, Cloutier G. Signal losses with real-time three-dimensional power Doppler imaging. ULTRASOUND IN MEDICINE & BIOLOGY 2007; 33:1632-9. [PMID: 17587487 DOI: 10.1016/j.ultrasmedbio.2007.04.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Revised: 04/10/2007] [Accepted: 04/26/2007] [Indexed: 05/16/2023]
Abstract
Power Doppler imaging (PDI) has been shown to be influenced by the wall filter when assessing arterial stenoses. Real-time 3-D Doppler imaging may likely become a widespread practice in the near future, but how the wall filter could affect PDI during the cardiac cycle has not been investigated. The objective of the study was to demonstrate that the wall filter may produce unexpected major signal losses in real-time 3-D PDI. To test our hypothesis, we first validated binary images obtained from analytical simulations with in vitro PDI acquisitions performed in a tube under pulsatile flow conditions. We then simulated PDI images in the presence of a severe stenosis, considering physiological conditions by finite element modeling. Power Doppler imaging simulations revealed important signal losses within the lumen area at different instants of the flow cycle, and there was a very good concordance between measured and predicted PDI binary images in the tube. Our results show that the wall filter may induce severe PDI signal losses that could negatively influence the assessment of vascular stenosis. Clinicians should therefore be aware of this cause of signal loss to properly interpret power Doppler angiographic images.
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Affiliation(s)
- Damien Garcia
- Laboratory of Biomedical Engineering, Clinical Research Institute of Montreal, University of Montreal, Montreal, Quebec, Canada.
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7
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Lu X, Nadvoretskiy V, Klas B, Bu L, Stolpen A, Ayres NA, Sahn DJ, Ge S. Measurement of Volumetric Flow by Real-time 3-Dimensional Doppler Echocardiography in Children. J Am Soc Echocardiogr 2007; 20:915-20. [PMID: 17555931 DOI: 10.1016/j.echo.2007.01.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Indexed: 11/21/2022]
Abstract
BACKGROUND We sought to assess the accuracy and reproducibility of an automated real-time (RT) 3-dimensional (3D) Doppler echocardiography (RT3DDE) technique for measuring volumetric flow (VF) in children. METHODS A total of 19 healthy children (age = 11.5 +/- 3.5 years) were studied to measure VF through mitral valve (MV), aortic valve (AV), pulmonary valve (PV), and tricuspid valve (TV) by RT3DDE. RT 3D echocardiography was also performed to measure left ventricular (LV) end-systolic volume, LV end-diastolic volume, and stroke volume (stroke volume = LV end-diastolic volume--LV end-systolic volume), which served as a reference standard for comparison with VF by RT3DDE. RESULTS Compared with stroke volume by RT 3D echocardiography, the correlation with VF was excellent for MV (r = 0.91), good for AV (r = 0.89) and PV (r = 0.89), but poor for TV (r = 0.20) by RT3DDE. There were good agreements for AV (bias = 0.9 +/- 5.0 mL), PV (bias = -0.4 +/- 5.7 mL), and MV (bias = 4.1 +/- 4.7 mL), and marked underestimation for TV (bias = -24.4 +/- 14.6 mL). CONCLUSIONS Our data demonstrated that VF measurement by RT3DDE is feasible and reasonably accurate for MV, AV, and PV but problematic for TV.
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Affiliation(s)
- Xiuzhang Lu
- Baylor College of Medicine, Houston, Texas 77030, USA
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8
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Abstract
Traumatic death remains pandemic. The majority of preventable deaths occur early and are due to injuries or physiologic derangements in the airway, thoracoabdominal cavities, or brain. Ultrasound is a noninvasive and portable imaging modality that spans a spectrum between the physical examination and diagnostic imaging. It allows trained examiners to immediately confirm important syndromes and answer clinical questions. Newer technologies greatly increase the fidelity, accessibility, ease of use, and informatic manipulation of the results. The early bedside use of focused ultrasound as the initial imaging modality used to detect hemoperitoneum and hemopericardium in the resuscitation of the injured patient has become an accepted standard of care. Widespread dissemination of basic ultrasound skills and technology to facilitate this brings ultrasound to many resuscitative and critical care areas. Although not as widely appreciated, the focused use of ultrasound may also have a role in detecting hemothoraces and pneumothoraces, guiding airway management, and detecting increased intracranial pressure. Intensivists generally utilize a treating philosophy that requires the real-time integration of many divergent sources of information regarding their patients' anatomy and physiology. They are therefore positioned to take advantage of focused resuscitative ultrasound, which offers immediate diagnostic information in the early care of the critically injured.
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Affiliation(s)
- Andrew W Kirkpatrick
- Department of Critical Care Medicine, Foothills Medicine Centre, Calgary, Alberta, Canada.
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Hung J, Lang R, Flachskampf F, Shernan SK, McCulloch ML, Adams DB, Thomas J, Vannan M, Ryan T. 3D echocardiography: a review of the current status and future directions. J Am Soc Echocardiogr 2007; 20:213-33. [PMID: 17336747 DOI: 10.1016/j.echo.2007.01.010] [Citation(s) in RCA: 193] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Judy Hung
- Massachusetts General Hospital, Boston, MA, USA
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10
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Pemberton J, Ge S, Thiele K, Jerosch-Herold M, Sahn DJ. Real-time Three-dimensional Color Doppler Echocardiography Overcomes the Inaccuracies of Spectral Doppler for Stroke Volume Calculation. J Am Soc Echocardiogr 2006; 19:1403-10. [PMID: 17098150 DOI: 10.1016/j.echo.2006.05.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Indexed: 11/22/2022]
Abstract
Real-time 3-dimensional echocardiography is increasingly used in clinical cardiology. Studies have been shown that this technique can be accurately used to assess both cardiac mass and chamber volumes. We review the work showing that real-time 3-dimensional Doppler echocardiography can be used to accurately calculate intracardiac flow volumes that can potentially be used to assess cardiac function, intracardiac shunt, and valve regurgitation.
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Affiliation(s)
- James Pemberton
- James Cook University Hospital, Middlesbrough, United Kingdom
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11
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Lang RM, Mor-Avi V, Sugeng L, Nieman PS, Sahn DJ. Three-Dimensional Echocardiography. J Am Coll Cardiol 2006; 48:2053-69. [PMID: 17112995 DOI: 10.1016/j.jacc.2006.07.047] [Citation(s) in RCA: 177] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Revised: 07/06/2006] [Accepted: 07/10/2006] [Indexed: 10/24/2022]
Abstract
Over the past 3 decades, echocardiography has become a major diagnostic tool in the arsenal of clinical cardiology for real-time imaging of cardiac dynamics. More and more, cardiologists' decisions are based on images created from ultrasound wave reflections. From the time ultrasound imaging technology provided the first insight into the human heart, our diagnostic capabilities have increased exponentially as a result of our growing knowledge and developing technology. One of the most significant developments of the last decades was the introduction of 3-dimensional (3D) imaging and its evolution from slow and labor-intense off-line reconstruction to real-time volumetric imaging. While continuing its meteoric rise instigated by constant technological refinements and continuing increase in computing power, this tool is guaranteed to be integrated in routine clinical practice. The major proven advantage of this technique is the improvement in the accuracy of the echocardiographic evaluation of cardiac chamber volumes, which is achieved by eliminating the need for geometric modeling and the errors caused by foreshortened views. Another benefit of 3D imaging is the realistic and unique comprehensive views of cardiac valves and congenital abnormalities. In addition, 3D imaging is extremely useful in the intraoperative and postoperative settings because it allows immediate feedback on the effectiveness of surgical interventions. In this article, we review the published reports that have provided the scientific basis for the clinical use of 3D ultrasound imaging of the heart and discuss its potential future applications.
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Affiliation(s)
- Roberto M Lang
- Cardiac Imaging Center, Department of Medicine, University of Chicago, Chicago, Illinois 60637, USA.
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12
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Pemberton J, Li X, Kenny A, Davies CH, Minette MS, Sahn DJ. Real-time 3-Dimensional Doppler Echocardiography for the Assessment of Stroke Volume: An In Vivo Human Study Compared with Standard 2-Dimensional Echocardiography. J Am Soc Echocardiogr 2005; 18:1030-6. [PMID: 16198879 DOI: 10.1016/j.echo.2005.03.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND Invasive monitors and noninvasive 2-dimensional echocardiography are the standard clinical methods for stroke volume (SV) and cardiac output computation. We studied the use of real-time color Doppler 3-dimensional (3D) echocardiography (3DE) for the assessment of SV in human beings. METHODS In all, 55 pediatric and adult patients with good transthoracic windows and a normal aortic valve were studied. Real-time 3DE color Doppler volumes incorporating the left ventricular outflow tract and aortic valve were taken. SV was calculated from the color Doppler data in the 3DE DICOM dataset. This was compared with 2-dimensional echocardiography SV calculation from the pulsed wave velocity through the aortic valve along with the left ventricular outflow tract diameter. RESULTS Five patients were excluded because of mismatching of the 3D color Doppler segments in the 3D volume. The 3D Doppler volumes from the remaining 50 patients were analyzed. There was good correlation between the patients' averaged 3DE SV calculations and the 2-dimensional echocardiography pulsed wave SV estimation (y = 0.84x + 7.8, r2 = 0.90). CONCLUSION Real-time 3D Doppler echocardiography can be used to accurately calculate SV and cardiac output, compared with conventional pulsed Doppler measurement, in pediatric and adult patients from transthoracic imaging.
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Affiliation(s)
- James Pemberton
- Clinical Care Center for Congenital Heart Disease, Department of Cardiology, Oregon Health and Science University, Portland, Oregon 97239, USA
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Bumbasirevic V, Karamarkovic A, Lesic A, Bumbasirevic M. Trauma-related sepsis and multiple organ failure: Current concepts in the diagnosis and management. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.cuor.2005.05.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Pemberton J, Hui L, Young M, Li X, Kenny A, Sahn DJ. Accuracy of 3-dimensional color Doppler-derived flow volumes with increasing image depth. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2005; 24:1109-15. [PMID: 16040826 DOI: 10.7863/jum.2005.24.8.1109] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
OBJECTIVES We and others have reported on the use of digital color Doppler sonography from real-time 3-dimensional (3D) echocardiography and its use in accurately calculating cardiac flow volumes, namely stroke volume (SV) and, hence, cardiac output. However, in some patients, image depth is higher than average, and this may affect the accuracy of volume calculation. We sought to investigate the impact of image depth and the accompanying change in signal strength, spatial resolution, and pulse repetition frequency on the accuracy of SV calculation from 3D color Doppler data in an in vitro model. METHODS A tube model of the left ventricular outflow tract was constructed from plastic tubing and connected to a pulsatile pump. The volume flowing through the tube was imaged using a 3D echocardiography system. Stroke volumes from the pump were computed from the DICOM data using commercially available software and compared with a reference standard of timed volumes with the use of a graduated measuring cylinder over a range of depth settings and SVs. RESULTS There was good correlation between the 3D-derived SVs and the reference cylinder measures over all depths from 4 to 16 cm at 1-cm increments with a tube diameter of 17 mm, a pump rate of 60 beats/min, and SVs ranging from 20 to 70 mL. The average r(2) value for the 13 different depths was 0.976. However, the accuracy of the 3D method of volume calculation appeared to fall at depths greater than 13 cm, especially at higher SVs. CONCLUSIONS Stroke volume calculation from real-time 3D color Doppler data in this in vitro study shows that at depths greater than approximately 13 cm, accuracy decreases, especially at higher SVs. This may be due to decreased resolution and the reduced frame rate at these depths. At shallower depths, volume calculation form the 3D Doppler data appears very accurate.
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Affiliation(s)
- James Pemberton
- Oregon Health & Science University, Portland, 97239-3098, USA
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15
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Pemberton J, Li X, Karamlou T, Sandquist CA, Thiele K, Shen I, Ungerleider RM, Kenny A, Sahn DJ. The use of live three-dimensional Doppler echocardiography in the measurement of cardiac output. J Am Coll Cardiol 2005; 45:433-8. [PMID: 15680724 DOI: 10.1016/j.jacc.2004.10.046] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Revised: 10/05/2004] [Accepted: 10/12/2004] [Indexed: 12/31/2022]
Abstract
OBJECTIVES The purpose of this study was to investigate whether cardiac output (CO) could be accurately computed from live three-dimensional (3-D) Doppler echocardiographic data in an acute open-chested animal preparation. BACKGROUND The accurate measurement of CO is important in both patient management and research. Current methods use invasive pulmonary artery catheters or two-dimensional (2-D) echocardiography or esophageal aortic Doppler measures, with the inherent risks and inaccuracies of these techniques. METHODS Seventeen juvenile, open-chested pigs were studied before undergoing a separate cardiopulmonary bypass procedure. Live 3-D Doppler echocardiography images of the left ventricular outflow tract and aortic valve were obtained by epicardial scanning, using a Philips Medical Systems (Andover, Massachusetts) Sonos 7500 Live 3-D Echo system with a 2.5-MHz probe. Simultaneous CO measurements were obtained from an ultrasonic flow probe placed around the aortic root. Subsequent offline processing using custom software computed the CO from the digital 3-D Doppler DICOM data, and this was compared to the gold standard of the aortic flow probe measurements. RESULTS One hundred forty-three individual CO measurements were taken from 16 pigs, one being excluded because of severe aortic regurgitation. There was good correlation between the 3-D Doppler and flow probe methods of CO measurement (y = 1.1x - 9.82, R(2) = 0.93). CONCLUSIONS In this acute animal preparation, live 3-D Doppler echocardiographic data allowed for accurate assessment of CO as compared to the ultrasonic flow probe measurement.
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Affiliation(s)
- James Pemberton
- Clinical Care Center for Congenital Heart Disease, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
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Kirkpatrick AW, Campbell MR, Jones JA, Broderick TJ, Ball CG, McBeth PB, McSwain NE, Hamilton DR, Holcomb JB. Extraterrestrial hemorrhage control: Terrestrial developments in technique, technology, and philosophy with applicability to traumatic hemorrhage control in long-duration spaceflight. J Am Coll Surg 2005; 200:64-76. [PMID: 15631922 DOI: 10.1016/j.jamcollsurg.2004.08.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2004] [Accepted: 08/27/2004] [Indexed: 12/27/2022]
Affiliation(s)
- Andrew W Kirkpatrick
- Departments of Critical Care Medicine and Surgery, and Calgary Brain Institute, Foothills Medical Centre, 1403 29th Street NW, Calgary, Alberta T2N 2T9, Canada.
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17
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Ge S, Bu L, Zhang H, Schelbert E, Disterhoft M, Li X, Li X, Sahn D, Stolpen A, Sonka M. A real-time 3-dimensional digital Doppler method for measurement of flow rate and volume through mitral valve in children: A validation study compared with magnetic resonance imaging. J Am Soc Echocardiogr 2005; 18:1-7. [PMID: 15637481 DOI: 10.1016/j.echo.2004.08.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We developed and assessed a real-time 3-dimensional (3D) digital Doppler method for measurement of flow volumes through the mitral valve in children. A total of 13 children (aged 10.46 +/- 2.5 years; 8 boys/5 girls) were enrolled. An ultrasound system (Sonos 7500, Philips, Andover, Mass) was used to acquire raw 3D velocity data for flow measurement based on Gaussian control surface theorem [flow (mL/s) = mean velocity x flow area]. Stroke volume (SV) measured by real-time 3D digital Doppler with the control surface at the mitral valve annulus or orifice was compared with the SV by phase velocity cine magnetic resonance imaging (MRI) at the ascending aorta and by left ventricular volumetric MRI measurement. The best correlation and agreement were seen at the mitral valve orifice by real-time 3D digital Doppler compared with SV by phase velocity cine MRI at the ascending aorta (r = 0.92, mean difference = -5.2 +/- 12.0 mL) and SV by left ventricular volumetric MRI measurement (r = 0.94, mean difference = -0.2 +/- 10.3 mL).
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Affiliation(s)
- Shuping Ge
- Division of Pediatric Cardiology, University of Iowa, USA.
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Kim B, Soble JS, Stamos TD, Neumann A, Robergé J. Automated volumetric flow quantification using angle-corrected color Doppler image. Echocardiography 2004; 21:399-408. [PMID: 15209718 DOI: 10.1111/j.0742-2822.2004.03066.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
We have developed a fully automated method for measuring volumetric blood flow with angle-corrected blood velocity from a color Doppler image. By computing the blood flow vector through a conduit, the angle of incidence between the direction of ultrasound beam and the direction of blood flow can be measured to correct the underestimated blood velocity. This correction immediately contributes to the improvement of measurement accuracy. The developed method also enhances the conduit identification procedure that is one of the most important factors affecting the accuracy of volumetric measurement. To evaluate the validity of the developed algorithm, experimental studies had been applied to 21 healthy subjects and 10 patients. Volumetric flows were measured from a color Doppler image of the left ventricular outflow track, which were compared with blood volumes that were measured by traditional pulsed-wave (PW)-Doppler technique. The mean stroke volume difference between two methods was -0.45 +/- 11.7 (mean +/- SD). The proposed algorithm is a viable method for determining blood flow volume in an automated fashion.
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Affiliation(s)
- Beomjin Kim
- Department of Computer Science, Indiana University-Purdue University, Fort Wayne, 46805, USA.
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Affiliation(s)
- R Phillip Dellinger
- Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Section of Critical Care Medicine, Cooper Health System, Camden 08103, USA.
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