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Toufan Tabrizi M, Faraji Azad H, Khezerlouy-Aghdam N, Sakha H. Measurement of mitral valve area by direct three dimensional planimetry compared to multiplanar reconstruction in patients with rheumatic mitral stenosis. THE INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING 2022; 38:1341-1349. [PMID: 35044628 DOI: 10.1007/s10554-022-02523-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/04/2022] [Indexed: 12/01/2022]
Abstract
Mitral valve area (MVA) measurement by three-dimensional transesophageal echocardiography (3D-TEE) has a crucial role in the evaluation of mitral stenosis (MS) severity. Three-dimensional direct (3D-direct) planimetry has been proposed as a new technique to measure mitral valve area. This study aimed to compare the 3D-direct mitral valve planimetry to conventional three-dimensional multiplanar reconstruction (3D-MPR) in severe MS using 3D-TEE. In this cross-sectional, prospective study; 149 patients with severe MS who were referred for transesophageal echocardiography in Shahid Madani Hospital (Tabriz Iran), just before percutaneous transmitral commissurotomy (PTMC), recruited consecutively. All patients underwent 2D transthoracic echocardiography (2D-TTE) and 3D-TEE in a single session before PTMC. During 2D-TTE planimetry, pressure half time (PHT), and proximal isovelocity surface area (PISA) were applied to measure the MVA. Transmitral mean pressure gradient (MPG) was measured. During 3D-TEE, MVA planimetry was carried out with both 3D-direct and 3D-MPR methods. 3D-direct was applied from both atrial and ventricular views. The consistency of MVA measurements with 3D-direct, 3D-MPR, and 2D-TTE methods was statistically investigated. Our sample consisted of 109 (73.2%) women and 40 (26.8%) men. The mean age was 51.75 ± 9.81 years. The agreement between 3D-direct and 3D-MPR planimetry was significant and moderate (0.99 ± 0.29 cm2 vs. 1.12 ± 0.26 cm2, intraclass correlation = 0.716, p value = 0.001).The accuracy of the 3D-direct method reduced significantly compared to the MPR method at MVA > 1.5 cm2. The maximum difference between two methods was observed in cases with MVAs larger than 1.5 cm2. MVA measured with the 3D-MPR method was significantly correlated with a 2D-TTE method, with a moderate agreement (intraclass correlation = 0.644, p value = 0.001). Also, 2D-TTE and 3D-direct TEE techniques yielded significantly consistent measurements of the MVA (1.06 ± 0.026 cm2 vs. 0.99 ± 0.29 cm2, intraclass correlation = 0.787, p value = 0.001); however, with a slight overestimation of the MVA by the former with a net difference of 0.06 ± 0.013 cm2. Mitral valve pressure gradient (MPG) had no significant correlation with planimetry results. A significant inverse correlation was seen between the MVA and pulmonary arterial systolic pressure. 3D-direct planimetry has an acceptable agreement with 3D-MPR planimetry at MVA less than 1.5 cm2, but their correlation decreases significantly at MVA above 1.5 cm2. 3D-direct planimetry underestimates MVA compared to 3D-MPR, especially at MVA above 1.5 cm2. It seems that the saddle shape of mitral valve, interferes with 3D-direct measurement of commissures at moderate MS. The 2D-TTE planimetry has generally acceptable accuracy, but its correlation to the 3D-TEE methods is significantly reduced in cases with moderate to severe MS (i.e. MVA > 1.0 cm2).
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Affiliation(s)
| | - Haniyeh Faraji Azad
- Cardiovascular Research Center, Tabriz University of Medical Science, Tabriz, Iran
| | | | - Hanieh Sakha
- Islamic Azad University, Tehran North Branch, Tehran, Iran
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Cupe-Chacalcaje K, Benites-Yshpilco L, Cachicatari-Beltrán A, Urdanivia-Ruiz D, Rafael-Horna E, Rojas P, Lévano-Pachas G, Baltodano-Arellano R. [Rheumatic mitral aggression. Usefulness of 3d transesophageal echocardiography]. ARCHIVOS PERUANOS DE CARDIOLOGIA Y CIRUGIA CARDIOVASCULAR 2022; 3:98-111. [PMID: 37283602 PMCID: PMC10241339 DOI: 10.47487/apcyccv.v3i2.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 06/28/2022] [Indexed: 06/08/2023]
Abstract
Rheumatic heart disease is the leading cause of cardiovascular disease in children under 25 years of age worldwide, with the highest prevalence in low-income countries. The usual and distinctive finding of rheumatic aggression is mitral stenosis, which leads to serious cardiovascular consequences. International guidelines establish transthoracic echocardiography (TTE) as the diagnostic test for rheumatic heart disease; however, it has limitations in the measurement of planimetry and those inherent to Doppler. Transesophageal 3D echocardiography (TTE-3D) is a new modality that shows realistic images of the mitral valve and has the added value of accurately locating the plane of maximum stenosis and better determining commissural involvement.
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Affiliation(s)
- Kelly Cupe-Chacalcaje
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | - Lindsay Benites-Yshpilco
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | | | - Dante Urdanivia-Ruiz
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | - Eliana Rafael-Horna
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | - Paol Rojas
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | - Gerald Lévano-Pachas
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
| | - Roberto Baltodano-Arellano
- . Hospital Nacional Guillermo Almenara, LimaPerú. Hospital Nacional Guillermo Almenara Lima Perú
- . Universidad Nacional Mayor de San Marcos, Lima, Perú. Universidad Nacional Mayor de San Marcos Universidad Nacional Mayor de San Marcos Lima Peru
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Kassar M, Praz F, Hunziker L, Pilgrim T, Windecker S, Seiler C, Brugger N. Anatomical and Technical Predictors of Three-Dimensional Mitral Valve Area Reduction After Transcatheter Edge-To-Edge Repair. J Am Soc Echocardiogr 2021; 35:96-104. [PMID: 34506920 DOI: 10.1016/j.echo.2021.08.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 08/20/2021] [Accepted: 08/30/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Among current transcatheter therapies for the treatment of mitral regurgitation, the MitraClip (MC; Abbott Vascular, Abbott Park, IL) system is the most commonly used. MitraClip implantation is usually contraindicated in patients with a mitral valve area (MVA) < 4.0 cm2. However, little is known about the real impact of MC implantation on MVA. Our goal was to investigate the factors influencing MVA reduction and derive the minimal MVA required to prevent the development of a clinically significant mitral stenosis (MVA < 1.5 cm2) in different clinical scenarios. METHODS Using three-dimensional data sets, the annulus and leaflet anatomy and MVA before clip implantation (MVABC) were assessed. After each MC implant (NTR or XTR), the relative MVA reduction and the absolute residual MVA were measured and their predictors evaluated. RESULTS The present analysis included 116 patients. An MC XTR was the first device implanted in 50% of the subjects, and 53% were treated with a single implant. The MVA reduction following one XTR was 57% ± 7% versus 52% ± 8% after one NTR (P = .001). A lower MVA reduction was observed when the MC was placed commissural/central versus paracentral (50% ± 8% vs 57% ± 7%, P < .0001). After a second device, the additional MVA reduction was higher when creating a triple-compared with a double-orifice morphology (34% ± 11% vs 25% ± 9%, P = .001). The MVA after one MC correlated with MVABC as well as with the clip type and position (r = 0.91, P < .0001). The MVABC, orifice morphology, and first device position predicted MVA after two implants (r = 0.82, P < .0001). Based on the mathematical relationship between these parameters, the minimal MVABC needed in eight different clinical scenarios was summarized in a decision algorithm: the values ranged from 3.5 to 4.7 cm2 for one and 4.5 to 6.3 cm2 for two MC strategies. CONCLUSIONS The minimal native MVA preventing clinically relevant MS after transcatheter edge-to-edge repair is predicted by the number and location of clip(s), orifice morphology, and device type. Based on these parameters, an algorithm has been derived to optimize patient selection and preprocedural planning.
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Affiliation(s)
- Mohammad Kassar
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Fabien Praz
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Lukas Hunziker
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Thomas Pilgrim
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Stephan Windecker
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Christian Seiler
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
| | - Nicolas Brugger
- Department of Cardiology, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland.
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Zhong X, Chen W, Shi Z, Huan Z, Ma L, Liu W, Yang X, Xu Y, Jiang Y, Lee APW, Guo R. Three-dimensional transesophageal echocardiography measurement of mitral valve area in patients with rheumatic mitral stenosis: multiplanar reconstruction or 3D direct planimetry? Int J Cardiovasc Imaging 2020; 37:99-107. [PMID: 32719991 DOI: 10.1007/s10554-020-01950-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 07/20/2020] [Indexed: 02/07/2023]
Abstract
3D direct planimetry is increasingly used in clinical practice as a rapid way to measure the mitral valve area (MVA) in patients with rheumatic mitral stenosis (MS) who underwent three-dimensional transesophageal echocardiography (3D-TEE). However, data on its accuracy and reliability are scarce. This study aimed to compare the MVA measurements obtained by 3D direct planimetry to the conventional technique multiplanar reconstruction (MPR) in MS patients using 3D-TEE. We retrospectively included 49 patients with rheumatic MS undergoing clinically-indicated 3D-TEE in the study. We determined the 3D direct planimetry measurements of MVA from the left atria aspect (MVALA) and the left ventricle aspect (MVALV), and compared those with the MPR method (MVAMPR). We also assessed the major and minor diameters of the mitral valve orifice using MPR and 3D direct planimetry. We found an excellent agreement between the MVA measurements obtained by the MPR method and 3D direct planimetry (MVALA and MVALV) [intraclass correlation coefficients (ICC) = 0.951 and 0.950, respectively]. However, the MVAMPR measurements were significantly larger than the MVALA and MVALV (p < 0.001; mean difference: 0.12 ± 0.15 cm2 and 0.11 ± 0.16 cm2, respectively).The inter-observer and intra-observer variability ICC were 0.875 and 0.856 for MVAMPR, 0.982 and 0.984 for MVALA, and 0.988 and 0.986 for MVALV, respectively. The major diameter measured by MPR (1.90 ± 0.42 cm) was significantly larger than that obtained by 3D direct planimetry (1.72 ± 0.35 cm for the LA aspect, p < 0.001; 1.73 ± 0.36 cm for the LV aspect, p < 0.001). The minor diameter measured by MPR (0.96 ± 0.25 cm) did not differ from that derived by 3D direct planimetry (0.94 ± 0.25 cm for the LA aspect, p = 0.07; 0.95 ± 0.27 cm for the LV aspect, p = 0.32). 3D direct planimetry provides highly reproducible measurements of MVA and yields data in excellent agreement with those obtained by the MPR method. The discrepancy between the two techniques may be due to differences in major diameter measurements of the mitral valve orifice.
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Affiliation(s)
- Xinbo Zhong
- Echo Lab, Department of Ultrasound Imaging, Renmin Hospital of Wuhan University, Wuhan, 430060, China.,Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China.,Department of Cardiology, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Wenbin Chen
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Zhiyong Shi
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Zhifu Huan
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Lanxiang Ma
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Wei Liu
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Xiaohan Yang
- Department of Cardiovascular Surgery, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Yan Xu
- Department of Cardiology, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Yong Jiang
- Department of Echocardiography, Fuwai Hospital Chinese Academy of Medical Sciences, Shenzhen, Shenzhen, 518057, China
| | - Alex Pui-Wai Lee
- Laboratory of Cardiac Imaging and 3D Printing, Li Ka Shing Institute of Health Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Ruiqiang Guo
- Echo Lab, Department of Ultrasound Imaging, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
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Argulian E, Seetharam K. Echocardiographic 3D-guided 2D planimetry in quantifying left-sided valvular heart disease. Echocardiography 2018; 35:695-706. [PMID: 29420834 DOI: 10.1111/echo.13828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Echocardiographic 3D-guided 2D planimetry can improve the accuracy of valvular disease assessment. Acquisition of 3D pyramidal dataset allows subsequent multiplanar reconstruction with accurate orthogonal plane alignment to obtain the correct borders of an anatomic orifice or flow area. Studies examining the 3D-guided 2D planimetry approach in left-sided valvular heart disease were identified and reviewed. The strongest evidence exists for estimating mitral valve area in patients with rheumatic mitral valve stenosis and vena contracta area in patients with mitral regurgitation (both primary and secondary). 3D-guided approach showed excellent feasibility and reproducibility in most studies, as well as time efficiency and good correlation with reference and comparator methods. Therefore, 3D-guided 2D planimetry can be used as an important clinical tool in quantifying left-sided valvular heart disease, especially mitral valve disorders.
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Utsunomiya H, Itabashi Y, Kobayashi S, Rader F, Hussaini A, Makar M, Trento A, Siegel RJ, Kar S, Shiota T. Effect of Percutaneous Edge-to-Edge Repair on Mitral Valve Area and Its Association With Pulmonary Hypertension and Outcomes. Am J Cardiol 2017; 120:662-669. [PMID: 28673638 DOI: 10.1016/j.amjcard.2017.05.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/17/2017] [Accepted: 05/17/2017] [Indexed: 12/19/2022]
Abstract
Percutaneous edge-to-edge repair using the MitraClip system causes reduction in mitral valve area (MVA). However, its clinical impact is not fully elucidated. This study assessed the impact of postprocedural MVA reduction on pulmonary hypertension and outcomes. A total of 92 patients with grades 3 to 4 + mitral regurgitation (MR) who underwent MitraClip therapy were retrospectively reviewed. Using intraprocedural, 3-dimensional transesophageal echocardiography, postprocedural MVA was obtained by 2 optimized planes through the medial and lateral orifices of the repaired valve. MVA was reduced by 60.1% immediately after MitraClip procedure (p <0.001). Postprocedural MVA correlated moderately with mean transmitral pressure gradient (TMPG) in the majority of patients (r = -0.56, p <0.001), but discordance of MVA and TMPG was observed in 40% of patients. In multivariable linear regression analysis, postprocedural MVA ≤1.94 cm2 was independently associated with a blunted decrease in systolic pulmonary artery pressure at 1-month follow-up (β-estimate -4.63, 95% confidence interval -9.71 to -0.15, p = 0.042). Postprocedural MVA ≤1.94 cm2 was an independent predictor of all-cause mortality and heart failure hospitalization after MitraClip (hazard ratio 4.28, 95% confidence interval 1.56 to 11.7, p = 0.005) even after adjustment for age, gender, atrial fibrillation, cause of MR, left ventricular systolic function, pre-existing pulmonary hypertension, and residual MR. After further adjustment for TMPG ≥5 mm Hg, postprocedural MVA ≤1.94 cm2 remained predictive for adverse outcomes (p = 0.048). In conclusion, the intraprocedural assessment of MVA by 3-dimensional transesophageal echocardiography can predict hemodynamic response and postprocedural prognosis after MitraClip therapy.
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Affiliation(s)
- Hiroto Utsunomiya
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Yuji Itabashi
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Sayuki Kobayashi
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Florian Rader
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Asma Hussaini
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Moody Makar
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Alfredo Trento
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Robert J Siegel
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Saibal Kar
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California
| | - Takahiro Shiota
- The Heart Institute, Cedars-Sinai Medical Center and UCLA, Los Angeles, California.
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Turton EW, Ender J. Role of 3D Echocardiography in Cardiac Surgery: Strengths and Limitations. CURRENT ANESTHESIOLOGY REPORTS 2017; 7:291-298. [PMID: 28890667 PMCID: PMC5565647 DOI: 10.1007/s40140-017-0226-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
PURPOSE OF REVIEW This review aims to highlight the general and specific strengths and limitations of intraoperative 3D echocardiography. This article explains the value of real-time three-dimensional transesophageal echocardiography (RT 3D TEE) during cardiac surgery and cardiac interventions. RECENT FINDINGS Recently published recommendations and guidelines include the use of RT 3D TEE. RT 3 D TEE provides additional value particularly for guidance during cardiac interventions (i.e., transcatheter mitral valve repair, left atrial appendix and atrial septal defect closures), assessment of the mitral valve in surgical repair, measurement of left ventricular outflow tract area for transcatheter valvular replacements, and estimating right and left ventricular volumes and function. The exact localization of paravalvular leakage is another strength of RT 3D TEE. The major limitation is the reduced temporal resolution compared to 2D TEE. SUMMARY Three-dimensional echocardiography is a powerful tool that improves communication and accurate measurements of cardiac structures.
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Affiliation(s)
- Edwin Wilberforce Turton
- Department of Anesthesiology and Intensive Care Medicine, Heart Center Leipzig, Struempellstr 39, 04289 Leipzig, Germany
| | - Jörg Ender
- Department of Anesthesiology and Intensive Care Medicine, Heart Center Leipzig, Struempellstr 39, 04289 Leipzig, Germany
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Abstract
Three-dimensional (3D) echocardiography has been conceived as one of the most promising methods for the diagnosis of valvular heart disease, and recently has become an integral clinical tool thanks to the development of high quality real-time transesophageal echocardiography (TEE). In particular, for mitral valve diseases, this new approach has proven to be the most unique, powerful, and convincing method for understanding the complicated anatomy of the mitral valve and its dynamism. The method has been useful for surgical management, including robotic mitral valve repair. Moreover, this method has become indispensable for nonsurgical mitral procedures such as edge to edge mitral repair and transcatheter closure of paravaluvular leaks. In addition, color Doppler 3D echo has been valuable to identify the location of the regurgitant orifice and the severity of the mitral regurgitation. For aortic and tricuspid valve diseases, this method may not be quite as valuable as for the mitral valve. However, the necessity of 3D echo is recognized for certain situations even for these valves, such as for evaluating the aortic annulus for transcatheter aortic valve implantation. It is now clear that this method, especially with the continued development of real-time 3D TEE technology, will enhance the diagnosis and management of patients with these valvular heart diseases.
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Affiliation(s)
- Takahiro Shiota
- Department of Medicine, Heart Institute, Cedars-Sinai Medical Center and University of California, Los Angeles, Los Angeles, CA, USA
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Andrawes MN, Feinman JW. 3-dimensional echocardiography and its role in preoperative mitral valve evaluation. Cardiol Clin 2014; 31:271-85. [PMID: 23743077 DOI: 10.1016/j.ccl.2013.03.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Echocardiography plays a key role in the preoperative evaluation of mitral valve disease. 3-dimensional echocardiography is a relatively new development that is being used more and more frequently in the evaluation of these patients. This article reviews the available literature comparing the use of this new technology to classic techniques in the assessment of mitral valve pathology. The authors also review some of the novel insights learned from 3-dimensional echocardiography and how they may be used in surgical decision making and planning.
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Affiliation(s)
- Michael N Andrawes
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA.
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Krapf L, Dreyfus J, Cueff C, Lepage L, Brochet É, Vahanian A, Messika-Zeitoun D. Anatomical features of rheumatic and non-rheumatic mitral stenosis: Potential additional value of three-dimensional echocardiography. Arch Cardiovasc Dis 2013; 106:111-5. [DOI: 10.1016/j.acvd.2012.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Revised: 10/10/2012] [Accepted: 11/13/2012] [Indexed: 10/27/2022]
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