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Goerlich CE, Griffith BP, Shah A, Treffalls JA, Zhang T, Lewis B, Tatarov I, Hershfeld A, Sentz F, Braileanu G, Ayares D, Singh AK, Mohiuddin MM. A Standardized Approach to Orthotopic (Life-supporting) Porcine Cardiac Xenotransplantation in a Nonhuman Primate Model. Transplantation 2023; 107:1718-1728. [PMID: 36706064 DOI: 10.1097/tp.0000000000004508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Cardiac xenotransplantation from swine has been proposed to "bridge the gap" in supply for heart failure patients requiring transplantation. Recent preclinical success using genetically modified pig donors in baboon recipients has demonstrated survival greater than 6 mo, with a modern understanding of xenotransplantation immunobiology and continued experience with large animal models of cardiac xenotransplantation. As a direct result of this expertise, the Food and Drug Administration approved the first in-human transplantation of a genetically engineered cardiac xenograft through an expanded access application for a single patient. This clinical case demonstrated the feasibility of xenotransplantation. Although this human study demonstrated proof-of-principle application of cardiac xenotransplantation, further regulatory oversight by the Food and Drug Administration may be required with preclinical trials in large animal models of xenotransplantation with long-term survival before approval of a more formalized clinical trial. Here we detail our surgical approach to pig-to-primate large animal models of orthotopic cardiac xenotransplantation, and the postoperative care of the primate recipient, both in the immediate postoperative period and in the months thereafter. We also detail xenograft surveillance methods and common issues that arise in the postoperative period specific to this model and ways to overcome them. These studies require multidisciplinary teams and expertise in orthotopic transplantation (cardiac surgery, anesthesia, and cardiopulmonary bypass), immunology, genetic engineering, and experience in handling large animal donors and recipients, which are described here. This article serves to reduce the barriers to entry into a field with ever-growing enthusiasm, but demands expertise knowledge and experience to be successful.
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Affiliation(s)
- Corbin E Goerlich
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Bartley P Griffith
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Aakash Shah
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - John A Treffalls
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Tianshu Zhang
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Billeta Lewis
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Ivan Tatarov
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Alena Hershfeld
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Faith Sentz
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | - Gheorghe Braileanu
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
| | | | - Avneesh K Singh
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD
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Prentice R, Ahmadian H, Thomas D, Berger J, Gore R. Improved efficiency and diagnostic utility of inpatient transthoracic echocardiography following implementation of a sonographer-initiated perflutren-based contrast administration protocol. Cardiovasc Ultrasound 2020; 18:35. [PMID: 32807198 PMCID: PMC7433118 DOI: 10.1186/s12947-020-00215-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 08/04/2020] [Indexed: 11/10/2022] Open
Abstract
Background Up to 20% of resting echocardiograms obtained are suboptimal leading to further downstream testing and delays in diagnosis. Contrast enhanced echocardiography is well established and endorsed for use by the American Society of Echocardiography (ASE) in clinical scenarios when 2 or more adjacent wall segments are not well visualized; however, varied institutional protocols and practices in place limit such use due to increased time and personnel needed to obtain such imaging. Methods The purpose of this study was to determineif sonographer administered echo contrast led to decreased time to complete inpatient echocardiography exams when compared to the current institutional policy of having a registered nurse perform administration of contrast via a case-control approach. Sonographers received a one-day training course on the techniques for contrast administration. Baseline completion times (time from 1st image to last image) were reviewed in studies from March 2015 to May 2015. Sonographers who received training began self-administration of contrast the first week of June 2015. After a familiarization period, study completion times were recorded from September 2015 to December 2015 and compared to those during the baseline phase. Sonographers were not informed that they were being monitored. Patients and the public were not involved in the design or conduct of our study. Results A total of 320 patients were included for analysis. Time spent obtaining contrast enhanced imaging was not significant between the two groups (p = 0.67). Time spent to complete each echocardiogram (time from first echocardiogram image to the last contrast enhanced echocardiogram image) was significant between the two groups (37.5 ± 10.9 min sonographer administered v 49.6 ± 12.5 min in nurse administered group, p < 0.001). Conclusion Utilizing a sonographer administered echo enhancement protocol results in reduced over 12 min of time saved per study.
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Affiliation(s)
- Ryan Prentice
- Cardiology Division, Brooke Army Medical Center, San Antonio, TX, USA
| | - Homayoun Ahmadian
- Cardiology Division, Brooke Army Medical Center, San Antonio, TX, USA
| | - Dustin Thomas
- Cardiology Division, Brooke Army Medical Center, San Antonio, TX, USA
| | - Jeremy Berger
- Cardiology Division, Brooke Army Medical Center, San Antonio, TX, USA
| | - Rosco Gore
- Cardiology Division, Brooke Army Medical Center, San Antonio, TX, USA.
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Kim J, Kim S, Lee Y, Yoon H, Eom K. Contrast Echocardiography in two-dimensional left ventricular measurements: comparison with 256-row multi-detector computed tomography as a reference standard in Beagles. J Vet Sci 2020; 20:e45. [PMID: 31565888 PMCID: PMC6769328 DOI: 10.4142/jvs.2019.20.e45] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/20/2019] [Accepted: 07/17/2019] [Indexed: 12/30/2022] Open
Abstract
Unenhanced echocardiography (UE), commonly used in veterinary practice, is limited by left ventricular (LV) foreshortening and observer dependency. Contrast echocardiography (CE) was used to compare two-dimensional (2D) LV measurements made using UE and 256-row multi-detector computed tomography (MDCT) as a reference standard. Seven healthy beagle dogs were evaluated in this study. Measurements obtained using CE, including LV wall thickness, internal diameter, and longitudinal and transverse length, were significantly greater than those obtained using UE. Measurements of LV internal dimension in diastole (LVIDd) and systole (LVIDs) were significantly larger with CE compared UE. Regardless of the cardiac cycle, LV longitudinal (LVLd and LVLs) and transverse diameter (LVTDd and LVTDs) measurements were significantly different with CE and approximated values from MDCT. Among automatically calculated parameters, LV end-systolic volume and the relative wall thickness were significantly different between UE and CE. In CE, the correlation coefficients of 4 major parameters (r = 0.87 in LVIDd; 0.91 in LVIDs; 0.87 in LVLd; and 0.81 in LVLs) showed higher values compared to the UE (r = 0.68 in LVIDd, 0.71 in LVIDs, 0.69 in LVLd, and 0.35 in LVLs). Inter-observer agreement was highest for MDCT and higher for CE than UE. In conclusion, CE is more accurate and reproducible than UE in assessing 2D LV measurements and can overcome the limitations of UE including LV foreshortening and high observer dependency.
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Affiliation(s)
- Jaehwan Kim
- Helix Animal Medical Center, Seoul 06546, Korea
| | - Soyoung Kim
- Department of Veterinary Medical Imaging, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea
| | - Yeonhea Lee
- Department of Veterinary Medical Imaging, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea
| | - Hakyoung Yoon
- Department of Veterinary Medical Imaging, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea
| | - Kidong Eom
- Department of Veterinary Medical Imaging, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea.
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Chai SC, Tan PJ, Tong KL. A review of the safety and clinical utility of contrast echocardiography. Singapore Med J 2019; 61:181-183. [PMID: 31820006 DOI: 10.11622/smedj.2019169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
There are limitations to the sensitivity and specificity of conventional two-dimensional echocardiograms in making an accurate diagnosis in certain patient populations. This led to the development of specific contrast-enhancing agents with the following characteristics: small enough to cross the pulmonary capillary bed, remain stable throughout the length of the procedure, do not dissolve in blood, and rapidly cleared from the body with low toxicity. Unfortunately, the use of contrast echocardiography has not taken off as expected. The low take-up rate among clinicians can largely be attributed to the black box warning by the United States Food and Drug Administration in 2007, after the coincidental occurrence of four patient deaths and about 190 severe cardiopulmonary reactions shortly after contrast agent administration. In this article, we address the clinical safety of contrast agents, share our institution's experience in using it and elaborate on the clinical indications of contrast echocardiography.
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Affiliation(s)
- Siang Chew Chai
- Department of Cardiology, Changi General Hospital, Singapore
| | - Puay Joo Tan
- Department of Cardiology, Changi General Hospital, Singapore
| | - Khim Leng Tong
- Department of Cardiology, Changi General Hospital, Singapore
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Ora M, Gambhir S. Myocardial Perfusion Imaging: A Brief Review of Nuclear and Nonnuclear Techniques and Comparative Evaluation of Recent Advances. Indian J Nucl Med 2019; 34:263-270. [PMID: 31579355 PMCID: PMC6771197 DOI: 10.4103/ijnm.ijnm_90_19] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Coronary artery disease (CAD) is the leading cause of morbidity and mortality worldwide. Invasive coronary angiography (ICA) is the gold standard for the evaluation of epicardial CAD. In the pathogenesis of the CAD, myocardial perfusion abnormalities are the first changes that appear followed by wall motion abnormalities, electrocardiogram changes, and angina. Myocardial perfusion imaging (MPI) demonstrates the cumulative effect of pathology at epicardial coronary arteries, small vessels, and endothelium. Thus, it evaluates the overall burden of ischemic heart disease (IHD). MPI is used noninvasively to diagnose early asymptomatic CAD or to know the functional significance of known CAD. There are evidence that early detection of myocardial perfusion abnormalities followed by aggressive intervention against cardiovascular risk factors may restore myocardial perfusion. This may lead to reduce morbidity and mortality. Various MPI modalities have been used to diagnose and define the severity of CAD. Cardiac myocardial perfusion single-photon emission computed tomography (myocardial perfusion scintigraphy [MPS]) has been in use since decades. Several newer modalities such as positron emission tomography, cardiac magnetic resonance imaging, computed tomography perfusion, and myocardial contrast echocardiography are developing utilizing the similar principle of MPS. We shall be reviewing briefly these modalities, their performance, comparison to each other, and with ICA.
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Affiliation(s)
- Manish Ora
- Professor and Head of the Department, SGPGIMS, Lucknow, Uttar Pradesh, India
| | - Sanjay Gambhir
- Department of Nuclear Medicine, SGPGIMS, Lucknow, Uttar Pradesh, India
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Meier NM, Foster ML, Battaile JT. Hereditary hemorrhagic telangiectasia and pulmonary arteriovenous malformations: clinical aspects. Cardiovasc Diagn Ther 2018; 8:316-324. [PMID: 30057878 DOI: 10.21037/cdt.2017.12.07] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hereditary hemorrhagic telangiectasia (HHT) is a genetic disorder of blood vessel formation resulting in mucocutaneous telangiectasias and visceral arteriovenous malformations. Nearly half of patients with HHT will have pulmonary arteriovenous malformations (PAVM) that place them at risk for potentially fatal complications that can occur when blood bypasses the pulmonary capillary circulation or as a result of PAVM rupture. Other manifestations of HHT outside the lung may increase the rate and severity of PAVM complications, creating unique clinical challenges. Management hinges on timely screening and diagnosis, followed by treatment of amenable PAVMs with transcatheter embolization in conjunction with medical management and prophylactic measures to treat and prevent complications. The purpose of this review is to highlight the clinical manifestations of PAVMs specific to patients with HHT and to detail screening and treatment strategies that can reduce the risk of developing life-threatening complications.
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Affiliation(s)
- Nathaniel M Meier
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Michael L Foster
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - John T Battaile
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
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Contrast-Enhanced Echocardiography Has the Greatest Impact in Patients with Reduced Ejection Fractions. J Am Soc Echocardiogr 2018; 31:289-296. [DOI: 10.1016/j.echo.2017.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Indexed: 11/18/2022]
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Yang Y, Qiu Z, Hou X, Sun L. Ultrasonic Characteristics and Cellular Properties of Anabaena Gas Vesicles. ULTRASOUND IN MEDICINE & BIOLOGY 2017; 43:2862-2870. [PMID: 28889941 DOI: 10.1016/j.ultrasmedbio.2017.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 07/24/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
Ultrasound imaging is a common modality in clinical examination and biomedical research, but has not played a significant role in molecular imaging for lack of an appropriate contrast agent. Recently, biogenic gas vesicles (GVs), naturally formed by cyanobacteria and haloarchaea, have exhibited great potential as an ultrasound molecular imaging probe with a much smaller size (∼100 nm) and improved imaging contrast. However, the basic acoustic and biological properties of GVs remain unclear, which hinders future application. Here, we studied the fundamental acoustic properties of a rod-shaped gas vesicle from Anabaena, a kind of cyanobacterium, including attenuation, oscillation resonance, and scattering, as well as biological behaviors (cellular internalization and cytotoxicity). We found that GVs have two resonance peaks (85 and 120 MHz). We also observed a significant non-linear effect and its pressure dependence as well. Ultrasound B-mode imaging reveals sufficient echogenicity of GVs for ultrasound imaging enhancement at high frequencies. Biological characterization also reveals endocytosis and non-toxicity.
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Affiliation(s)
- Yaoheng Yang
- Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hong, Hong Kong SA
| | - Zhihai Qiu
- Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hong, Hong Kong SA
| | - Xuandi Hou
- Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hong, Hong Kong SA
| | - Lei Sun
- Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hong, Hong Kong SA.
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Leischik R, Dworrak B, Sanchis-Gomar F, Lucia A, Buck T, Erbel R. Echocardiographic assessment of myocardial ischemia. ANNALS OF TRANSLATIONAL MEDICINE 2016; 4:259. [PMID: 27500160 DOI: 10.21037/atm.2016.07.06] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Over the last 60 years, echocardiography has emerged as a dominant and indispensable technique for the detection and assessment of coronary heart disease (CHD). In this review, we will describe and discuss this powerful tool of cardiology, especially in the hands of an experienced user, with a focus on myocardial ischemia. Technical development is still on-going, and various new ultrasound techniques have been established in the field of echocardiography in the last several years, including tissue Doppler imaging (TDI), contrast echocardiography, three-dimensional echocardiography (3DE), and speckle tracking echocardiography (i.e., strain/strain rate-echocardiography). High-end equipment with harmonic imaging, high frame rates and the opportunity to adjust mechanical indices has improved imaging quality. Like all new techniques, these techniques must first be subjected to comprehensive scientific assessment, and appropriate training that accounts for physical and physiological limits should be provided. These limits will constantly be redefined as echocardiographic techniques continue to change, which will present new challenges for the further development of ultrasound technology.
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Affiliation(s)
- Roman Leischik
- Faculty of Health, School of Medicine, University Witten/Herdecke, Hagen, Germany
| | - Birgit Dworrak
- Faculty of Health, School of Medicine, University Witten/Herdecke, Hagen, Germany
| | | | - Alejandro Lucia
- Research Institute Hospital 12 de Octubre ("i+12"), Madrid, Spain;; European University of Madrid, Madrid, Spain
| | - Thomas Buck
- Clinic of Cardiology, Klinikum Westfalen, Dortmund, Germany
| | - Raimund Erbel
- Institute of Medical Informatics, Biometry, Epidemiology, University Clinic Essen, Essen, Germany
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Li X, He S, Zhang YS, Chen Y, He JC. Resting Myocardial Contrast Echocardiography for the Evaluation of Coronary Microcirculation Dysfunction in Patients With Early Coronary Artery Disease. Clin Cardiol 2016; 39:453-8. [PMID: 27163691 DOI: 10.1002/clc.22548] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 03/15/2016] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Coronary microcirculation dysfunction can occur in patients with chest pain suggestive of coronary artery disease (CAD). The present study aimed to determine the diagnostic value of resting myocardial contrast echocardiography (MCE) for early CAD with myocardial microcirculation dysfunction by evaluating the continuous imaging time, peak time, and peak intensity. HYPOTHESIS Resting MCE is an effective and noninvasive method for evaluation of coronary microcirculation dysfunction in patients with early coronary artery disease. METHODS The present study included 20 consecutive patients without obvious clinical evidence of early CAD and 20 healthy volunteers. Resting MCE was performed to evaluate the myocardial microcirculation perfusion, and the follow-up evaluation of myocardial microcirculation perfusion was performed with technetium 99 m 2-methoxy-isobutyl-isonitrile ((99m) Tc-MIBI) single-photon emission computed tomography (SPECT). RESULTS Peak intensity was significantly lower in patients with high risk of CAD than in controls (P < 0.0001). The peak time and continuous imaging time were significantly higher in patients with high risk of CAD than in controls (P < 0.0001). None of the 40 subjects experienced discomfort, such as cough and chest tightness, during the resting MCE procedure, and the heart rate and blood pressure showed no abnormalities during the entire procedure. SPECT imaging showed reversible myocardial perfusion reduction in 80% (16/20) of the patients with high risk of CAD. Abnormalities of heart rate and blood pressure and adverse reactions were noted during the process of SPECT examination. CONCLUSIONS Resting MCE is an effective and noninvasive method for detecting abnormalities of coronary microcirculation and can help in the clinical analysis, risk assessment, and treatment of early occult CAD.
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Affiliation(s)
- Xin Li
- Department of Ultrasound, Navy General Hospital, Beijing, China
| | - Sheng He
- Department of Ultrasound, Navy General Hospital, Beijing, China
| | - Yun-Shan Zhang
- Department of Ultrasound, Navy General Hospital, Beijing, China
| | - Yu Chen
- Department of Cardiology, Navy General Hospital, Beijing, China
| | - Jiang-Chun He
- Department of Cardiology, Navy General Hospital, Beijing, China
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Nair N, Gongora E. Role of cardiovascular imaging in selection of donor hearts. World J Transplant 2015; 5:348-353. [PMID: 26722663 PMCID: PMC4689946 DOI: 10.5500/wjt.v5.i4.348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 09/02/2015] [Accepted: 10/13/2015] [Indexed: 02/05/2023] Open
Abstract
AIM: To perform a systematic review of literature on use of cardiovascular imaging in assessment of donor hearts.
METHODS: A systematic search of current literature from January 1965 to August 2015 was performed using PubMed and Google Scholar to investigate the different imaging modalities used to assess donor hearts.
RESULTS: Recent literature still estimates only a 32% utilization of available donor hearts in the United States. Most common imaging modality used is transthoracic echocardiography. Use of advanced imaging modalities such as 3D echocardiography, cardiac computer tomography and cardiac magnetic resonance to evaluate donor hearts is not reported in literature. This review attempts to highlight the relevant imaging modalities that can be used to assess cardiac function in a time-efficient manner. The algorithm suggested in this review would hopefully pave the way to standardized protocols that can be adopted by organ procuring organizations to increase the donor pool.
CONCLUSION: Use of advanced imaging techniques for a thorough assessment of organs will likely increase the donor pool.
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Abstract
Microbubbles are an excellent intravascular tracer, and both the rate of myocardial opacification (analogous to coronary microvascular perfusion) and contrast intensity (analogous to myocardial blood volume) provide unique insights into myocardial perfusion. A strong evidence base has been accumulated to show comparability with nuclear perfusion imaging and incremental diagnostic and prognostic value relative to wall motion analysis. This technique also provides the possibility to measure myocardial perfusion at the bedside. Despite all of these advantages, the technique is complicated, technically challenging, and has failed to scale legislative and financial hurdles. The development of targeted imaging and therapeutic interventions will hopefully rekindle interest in this interesting modality.
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Affiliation(s)
- Faraz Pathan
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia
| | - Thomas H Marwick
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia.
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Butler MB, Dermitzakis A, Looney P, Thomas DH, Pye SD, Sboros V. A setup for the assessment of the effect of tubular confinement on the acoustic response of microbubbles. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2014:242-5. [PMID: 25569942 DOI: 10.1109/embc.2014.6943574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Ultrasound contrast agents are gas filled microbubbles which produced enhanced echoes in ultrasound imaging thus allowing the acquisition of detailed information on the path of blood. It is theoretically known that the size of a vessel affects the behavior of a microbubble, which could potentially be used to discriminate different sized vessels. This information would be useful in the monitoring of neovascularization in tumor growth or treatment. However, currently it is not possible to identify the vessel diameter by any means of signal processing of microbubble echoes. In order to assess microbubble behavior when confined in tubes we compared the acoustic backscatter from biSphere™ microbubbles both free in water and flowing in 200 μm diameter tubes that are similar in size to arterioles. Experimental systems that allow the interrogation of individual microbubbles were designed and modified to allow investigation of both free microbubbles and those in tubes. Unprocessed single microbubble RF data were collected, allowing the calculation of both the fundamental and second harmonic components of the backscattered signal. Microbubbles confined in tubes had lower amplitude response compared to unconfined microbubbles. On consecutive insonations of the same microbubble, free microbubbles produced echoes above noise more often than confined microbubbles. This setup may be used to investigate microbubble behavior in a range of smaller tubes with diameters similar to capillaries thus enabling signal processing design for vessel differentiation.
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Khush KK, Nguyen J, Goldstein BA, McGlothlin DP, Zaroff JG. Reliability of transthoracic echocardiogram interpretation in potential adult heart transplant donors. J Heart Lung Transplant 2014; 34:266-9. [PMID: 25434522 DOI: 10.1016/j.healun.2014.09.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/25/2014] [Accepted: 09/30/2014] [Indexed: 01/26/2023] Open
Affiliation(s)
- Kiran K Khush
- Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
| | - John Nguyen
- California Transplant Donor Network, Oakland, California
| | - Benjamin A Goldstein
- Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, NC
| | - Dana P McGlothlin
- Kaiser Northern California Division of Research, Oakland, California
| | - Jonathan G Zaroff
- Kaiser Northern California Division of Research, Oakland, California
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Grecu L, Fishman MA. Beware of Life-Threatening Activation of Air Bubble Detector during Contrast Echocardiography in Patients on Venoarterial Extracorporeal Membrane Oxygenator Support. J Am Soc Echocardiogr 2014; 27:1130-1. [DOI: 10.1016/j.echo.2014.06.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Indexed: 12/17/2022]
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Images as drivers of progress in cardiac computational modelling. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2014; 115:198-212. [PMID: 25117497 PMCID: PMC4210662 DOI: 10.1016/j.pbiomolbio.2014.08.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 08/02/2014] [Indexed: 11/28/2022]
Abstract
Computational models have become a fundamental tool in cardiac research. Models are evolving to cover multiple scales and physical mechanisms. They are moving towards mechanistic descriptions of personalised structure and function, including effects of natural variability. These developments are underpinned to a large extent by advances in imaging technologies. This article reviews how novel imaging technologies, or the innovative use and extension of established ones, integrate with computational models and drive novel insights into cardiac biophysics. In terms of structural characterization, we discuss how imaging is allowing a wide range of scales to be considered, from cellular levels to whole organs. We analyse how the evolution from structural to functional imaging is opening new avenues for computational models, and in this respect we review methods for measurement of electrical activity, mechanics and flow. Finally, we consider ways in which combined imaging and modelling research is likely to continue advancing cardiac research, and identify some of the main challenges that remain to be solved.
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Abstract
Ultrasound-mediated gene delivery with microbubbles has emerged as an attractive nonviral vector system for site-specific and noninvasive gene therapy. Ultrasound promotes intracellular uptake of therapeutic agents, particularly in the presence of microbubbles, by increasing vascular and cell membrane permeability. Several preclinical studies have reported successful gene delivery into solid tumors with significant therapeutic effects using this novel approach. This review provides background information on gene therapy and ultrasound bioeffects and discusses the current progress and overall perspectives on the application of ultrasound and microbubble-mediated gene delivery in cancer.
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Parker JM, Weller MW, Feinstein LM, Adams RJ, Main ML, Grayburn PA, Cosgrove DO, Goldberg BA, Darge K, Nihoyannopoulos P, Wilson S, Monaghan M, Piscaglia F, Fowlkes B, Mathias W, Moriyasu F, Chammas MC, Greenbaum L, Feinstein SB. Safety of ultrasound contrast agents in patients with known or suspected cardiac shunts. Am J Cardiol 2013; 112:1039-45. [PMID: 23816393 DOI: 10.1016/j.amjcard.2013.05.042] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 05/08/2013] [Accepted: 05/08/2013] [Indexed: 12/01/2022]
Abstract
Contrast-enhanced ultrasound imaging is a radiation-free diagnostic tool that uses biocompatible ultrasound contrast agents (UCAs) to improve image clarity. UCAs, which do not contain dye, often salvage "technically difficult" ultrasound scans, increasing the accuracy and reliability of a front-line ultrasound diagnosis, reducing unnecessary downstream testing, lowering overall health care costs, changing therapy, and improving patient care. Two UCAs currently are approved and regulated by the US Food and Drug Administration. They have favorable safety profiles and risk/benefit ratios in adult and pediatric populations, including compromised patients with severe cardiovascular diseases. Nevertheless, these UCAs are contraindicated in patients with known or suspected right-to-left, bidirectional, or transient right-to-left cardiac shunts. These patients, who constitute 10% to 35% of the general population, typically receive no UCAs when they undergo echocardiography. If their echocardiographic images are suboptimal, they may receive inappropriate diagnosis and treatment, or they may be referred for additional diagnostic testing, including radiation-based procedures that increase their lifetime risk for cancer or procedures that use contrast agents containing dye, which may increase the risk for kidney damage. An exhaustive review of current peer-reviewed research demonstrated no scientific basis for the UCA contraindication in patients with known or suspected cardiac shunts. Initial safety concerns were based on limited rodent data and speculation related to macroaggregated albumin microspheres, a radioactive nuclear imaging agent with different physical and chemical properties and no relation to UCAs. Radioactive macroaggregated albumin is not contraindicated in adult or pediatric patients with cardiac shunts and is routinely used in these populations. In conclusion, the International Contrast Ultrasound Society Board recommends removal of the contraindication to further the public interest in safe, reliable, radiation-free diagnostic imaging options for patients with known or suspected cardiac shunts and to reduce their need for unnecessary downstream testing.
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Chong A, Haluska B, Wahi S. Clinical application and laboratory protocols for performing contrast echocardiography. Indian Heart J 2013; 65:337-46. [PMID: 23809394 PMCID: PMC3861153 DOI: 10.1016/j.ihj.2013.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 04/03/2013] [Indexed: 10/27/2022] Open
Abstract
Technically difficult echocardiographic studies with suboptimal images remain a significant challenge in clinical practice despite advances in imaging technologies over the past decades. Use of microbubble ultrasound contrast for left ventricular opacification and enhancement of endocardial border detection during rest or stress echocardiography has become an essential component of the operation of the modern echocardiography laboratory. Contrast echocardiography has been demonstrated to improve diagnostic accuracy and confidence across a range of indications including quantitative assessment of left ventricular systolic function, wall motion analysis, and left ventricular structural abnormalities. Enhancement of Doppler signals and myocardial contrast echocardiography for perfusion remain off-label uses. Implementation of a contrast protocol is feasible for most laboratories and both physicians and sonographers will require training in contrast specific imaging techniques for optimal use. Previous concerns regarding the safety of contrast agents have since been addressed by more recent data supporting its excellent safety profile and overall cost-effectiveness.
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Affiliation(s)
| | | | - Sudhir Wahi
- Department of Cardiology, Princess Alexandra Hospital, School of Medicine, University of Queensland, 199 Ipswich Road, Woolloongabba, Brisbane 4102, Australia
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Liu Y, Yi S, Zhang J, Fang Z, Zhou F, Jia W, Liu Z, Ye G. Effect of Microbubble-enhanced Ultrasound on Prostate Permeability: A Potential Therapeutic Method for Prostate Disease. Urology 2013; 81:921.e1-7. [DOI: 10.1016/j.urology.2012.12.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 12/05/2012] [Accepted: 12/12/2012] [Indexed: 10/27/2022]
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Bagur R, Bernier M, Kandzari DE, Karmpaliotis D, Lembo NJ, Rinfret S. A novel application of contrast echocardiography to exclude active coronary perforation bleeding in patients with pericardial effusion. Catheter Cardiovasc Interv 2012; 82:221-9. [DOI: 10.1002/ccd.24564] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 06/09/2012] [Accepted: 07/08/2012] [Indexed: 11/08/2022]
Affiliation(s)
- Rodrigo Bagur
- Institut Universitaire de Cardiologie et de Pneumologie de Québec (Quebec Heart & Lung Institute) - Laval University; Quebec City Quebec Canada
| | - Mathieu Bernier
- Institut Universitaire de Cardiologie et de Pneumologie de Québec (Quebec Heart & Lung Institute) - Laval University; Quebec City Quebec Canada
| | | | | | | | - Stéphane Rinfret
- Institut Universitaire de Cardiologie et de Pneumologie de Québec (Quebec Heart & Lung Institute) - Laval University; Quebec City Quebec Canada
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Zhang S, Zong Y, Wan M, Yu X, Fu Q, Ding T, Zhou F, Wang S. Compare ultrasound-mediated heating and cavitation between flowing polymer- and lipid-shelled microbubbles during focused ultrasound exposures. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2012; 131:4845-4855. [PMID: 22712955 DOI: 10.1121/1.4714339] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This paper compares the efficiency of flowing polymer- and lipid-shelled microbubbles (MBs) in the heating and cavitation during focused ultrasound exposures. Temperature and cavitation activity were simultaneously measured as the two types of shelled MBs and saline flowing through a 3 mm diameter vessel in the phantom with varying flow velocities (0-20 cm/s) at different acoustic power levels (0.6-20 W) with each exposure for 5 s. Temperature and cavitation for the lipid-shelled MBs were higher than those for the polymer-shelled MBs. Temperature rise decreased with increasing flow velocities for the two types of shelled MBs and saline at acoustic power 1.5 W. At acoustic power 11.1 W, temperature rise increased with increasing flow velocities for the lipid-shelled MBs. For the polymer-shelled MBs, the temperature rise increased with increasing flow velocities from 3-15 cm/s and decreased at 20 cm/s. Cavitation increased with increasing flow velocity for the two shelled MBs and there were no significant changes of cavitation with increasing flow velocities for saline. These results suggested that lipid-shelled MBs may have a greater efficiency than polymer-shelled MBs in heating and cavitation during focused ultrasound exposures.
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Affiliation(s)
- Siyuan Zhang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
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Grover S, Srinivasan G, Selvanayagam JB. Myocardial viability imaging: does it still have a role in patient selection prior to coronary revascularisation? Heart Lung Circ 2012; 21:468-79. [PMID: 22521496 DOI: 10.1016/j.hlc.2012.03.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 03/06/2012] [Accepted: 03/09/2012] [Indexed: 11/28/2022]
Abstract
Patients with severe left ventricular (LV) dysfunction and multi-vessel coronary artery disease (CAD) are at high risk during revascularisation, however they are also likely to derive the most benefit. Historically, the detection of dysfunctional but potentially viable myocardium ('stunned or hibernating myocardium') has been central to the decision-making regarding revascularisation. A number of recent studies have challenged this paradigm, questioning the role of viability testing in this population. In this review, we will examine the position of viability testing and how it is best incorporated in the modern era of coronary revascularisation. We will outline the role of currently available imaging modalities in viability assessment. Myocardial viability testing will continue to play a role in revascularisation decisions, although larger randomised trials with clinical outcome end-points are needed to further define its role.
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Affiliation(s)
- Suchi Grover
- Department of Cardiovascular Medicine, Discipline of Medicine, Flinders University of South Australia, Flinders Medical Centre, Australia
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Liu Z, Gao S, Zhao Y, Li P, Liu J, Li P, Tan K, Xie F. Disruption of tumor neovasculature by microbubble enhanced ultrasound: a potential new physical therapy of anti-angiogenesis. ULTRASOUND IN MEDICINE & BIOLOGY 2012; 38:253-261. [PMID: 22178162 DOI: 10.1016/j.ultrasmedbio.2011.11.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 10/27/2011] [Accepted: 11/13/2011] [Indexed: 05/31/2023]
Abstract
Tumor angiogenesis is of vital importance to the growth and metastasis of solid tumors. The angiogenesis is featured with a defective, leaky and fragile vascular construction. Microbubble enhanced ultrasound (MEUS) cavitation is capable of mechanical disruption of small blood vessels depending on effective acoustic pressure amplitude. We hypothesized that acoustic cavitation combining high-pressure amplitude pulsed ultrasound (US) and circulating microbubble could potentially disrupt tumor vasculature. A high-pressure amplitude, pulsed ultrasound device was developed to induce inertial cavitation of circulating microbubbles. The tumor vasculature of rat Walker 256 was insonated percutaneously with two acoustic pressures, 2.6 MPa and 4.8 MPa, both with intravenous injection of a lipid microbubble. The controls were treated by the ultrasound only or sham ultrasound exposure. Contrast enhanced ultrasound (CEUS) and histology were performed to assess tumor circulation and pathological changes. The CEUS results showed that the circulation of Walker 256 tumors could be completely blocked off for 24 hours in 4.8 MPa treated tumors. The CEUS gray scale value (GSV) indicated that there was significant GSV drop-off in both of the two experimental groups but none in the controls. Histology showed that the tumor microvasculature was disrupted into diffuse hematomas accompanied by thrombosis, intercellular edema and multiple cysts formation. The 24 hours of tumor circulation blockage resulted in massive necrosis of the tumor. MEUS provides a new, simple physical method for anti-angiogenic therapy and may have great potential for clinical applications.
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Affiliation(s)
- Zheng Liu
- Department of Ultrasound, Xinqiao Hospital, The Third Military Medical University, Chongqing, China.
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25
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Zhang S, Ding T, Wan M, Jiang H, Yang X, Zhong H, Wang S. Minimizing the thermal losses from perfusion during focused ultrasound exposures with flowing microbubbles. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2011; 129:2336-2344. [PMID: 21476689 DOI: 10.1121/1.3552982] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This paper demonstrated the use of flowing microbubbles (MBs) to minimize thermal losses from perfusion during focused ultrasound exposures due to acoustic cavitation. Temperature and cavitation were simultaneously investigated as MBs flowing through a wall-less flow phantom with varying flow velocities (2-55 cm/s) and concentrations (0%-0.1%) when exposed at different acoustic power levels (5-120 W). The peak temperature at the end of ultrasonic exposures in the flow and in the outer of the vessel as well as the cavitation were higher than those pure controls measured at the same exposure parameters and flow velocities but without MBs. All the peak temperatures initially increased with increasing flow velocities of MBs, followed by a decrease of the peak temperatures with increasing flow velocities when the velocity was higher than the inflection velocity. Meanwhile, cavitation showed a trend of increases with increasing flow velocity. The inflection velocity and cavitation increased with increasing acoustic power and MBs concentration. Thermal lesion appeared around the vessel as MBs flow through the vessel, at which lesion was not observed originally without MBs. These results suggested that this may provide an effective way to minimize thermal losses from perfusion during focused ultrasound exposures.
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Affiliation(s)
- Siyuan Zhang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
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Sboros V, Tang MX. The assessment of microvascular flow and tissue perfusion using ultrasound imaging. Proc Inst Mech Eng H 2010; 224:273-90. [PMID: 20349819 DOI: 10.1243/09544119jeim621] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Imaging microvascular flow is of diagnostic value for a wide range of diseases including cancer, inflammation, and cardiovascular disease. The introduction of microbubbles as ultrasound contrast agents offers significant signal enhancement to the otherwise weakly scattered signal from blood in the circulation. Microbubbles provide maximum impedance mismatch, but are not linear scatterers. Their complex response to ultrasound has generated research on both their behaviour and their scattered-signal processing. Nearly 20 years ago signal processing started with simple spectral filtering of harmonics showing contrast-enhanced images. More recent pulse encoding techniques have achieved good cancellation of tissue echoes. The good quality contrast-only images enabled ultrasound contrast-imaging applications to be established in microvascular measurements in the liver and the myocardium. The field promises to advance the quantification of microvascular flow kinetics.
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Affiliation(s)
- V Sboros
- Medical Physics, University of Edinburgh, Edinburgh, UK.
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Olszowska M, Kostkiewicz M, Podolec P, Rubis P, Tracz W. Myocardial Viability Detected by Myocardial Contrast Echocardiography-Prognostic Value in Patients after Myocardial Infarction. Echocardiography 2010; 27:430-4. [DOI: 10.1111/j.1540-8175.2009.01034.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Tang MX, Kamiyama N, Eckersley RJ. Effects of nonlinear propagation in ultrasound contrast agent imaging. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:459-66. [PMID: 20133035 DOI: 10.1016/j.ultrasmedbio.2009.11.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Revised: 11/12/2009] [Accepted: 11/24/2009] [Indexed: 05/12/2023]
Abstract
This paper investigates two types of nonlinear propagation and their effects on image intensity and contrast-to-tissue ratio (CTR) in contrast ultrasound images. Previous studies have shown that nonlinear propagation can occur when ultrasound travels through tissue and microbubble clouds, making tissue farther down the acoustic path appear brighter in pulse inversion (PI) images, thus reducing CTR. In this study, the effect of nonlinear propagation through tissue or microbubbles on PI image intensity and CTR are compared at low mechanical index. A combination of simulation and experiment with SonoVue microbubbles were performed using a microbubble dynamics model, a laboratory ultrasound system and a clinical prototype scanner. The results show that, close to the bubble resonance frequency, nonlinear propagation through a bubble cloud of a few centimeter thickness with a modest concentration (1:10000 dilution of SonoVue microbubbles) is much more significant than through tissue-mimicking material. Consequently, CTR in regions distal to the imaging probe is greatly reduced for nonlinear propagation through the bubble cloud, with as much as a 12-dB reduction compared with nonlinear propagation through tissue-mimicking material. Both types of nonlinear propagation cause only a small change in bubble PI signals at the bubble resonance frequency. When the driving frequency increases beyond bubble resonance, nonlinear propagation through bubbles is greatly reduced in absolute values. However because of a greater reduction in nonlinear scattering from bubbles at higher frequencies, the corresponding CTR is much lower than that at bubble resonance frequency.
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Affiliation(s)
- Meng-Xing Tang
- Department of Bioengineering, Faculty of Engineering, Imperial College London, London, UK.
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Affiliation(s)
- Linda D. Gillam
- From the Division of Cardiology, Columbia University College of Physicians and Surgeons and New York Presbyterian Hospital, New York, NY
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Acute Left Ventricular Remodeling After Myocardial Infarction on Transthoracic Echocardiography: A Case Series. J Am Soc Echocardiogr 2009; 22:1309.e1-5. [DOI: 10.1016/j.echo.2009.05.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Indexed: 11/23/2022]
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Affiliation(s)
- Michael Salerno
- From the University of Virginia Health System, Charlottesville, Va
| | - George A. Beller
- From the University of Virginia Health System, Charlottesville, Va
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Laing ST, McPherson DD. Cardiovascular therapeutic uses of targeted ultrasound contrast agents. Cardiovasc Res 2009; 83:626-35. [PMID: 19581314 DOI: 10.1093/cvr/cvp192] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The therapeutic use of ultrasound contrast agents (UCAs) is an emerging methodology with high potential for enhanced directed therapeutic gene, bioactive gas, drug, and stem cell delivery. Ultrasound-targeted microbubble destruction has already demonstrated feasibility for plasmid DNA delivery. Similarly, therapeutic ultrasound for thrombolysis treatment has been taken into the clinical setting, and the addition of UCAs for therapeutic delivery or enhanced effect through cavitation is a natural progression to this investigation. However, as with any new technique, safety needs to be first demonstrated before translation into clinical practice. This review article will focus on the development of UCAs for cardiac and vascular therapeutics as well as the limitations/concerns for the use of therapeutic ultrasound in clinical medicine in order to lay a foundation for investigators planning to enter this exciting field or for those who want to broaden their understanding.
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Affiliation(s)
- Susan T Laing
- Division of Cardiology, Department of Internal Medicine, University of Texas Health Sciences Center-Houston, 6431 Fannin Street, MSB 1.246, Houston, TX 77030, USA.
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Asch FM, Weissman NJ. Overview of the 2008 Food and Drug Administration Advisory Committee on safety considerations in the development of ultrasound contrast agents. Circulation 2009; 119:1956-61. [PMID: 19364988 DOI: 10.1161/circulationaha.108.831156] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Federico M Asch
- Washington Hospital Center, MedStar Research Institute, Washington, DC 20010, USA
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Cosgrove D, Harvey C. Clinical uses of microbubbles in diagnosis and treatment. Med Biol Eng Comput 2009; 47:813-26. [PMID: 19205774 DOI: 10.1007/s11517-009-0434-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Accepted: 11/20/2008] [Indexed: 12/27/2022]
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American Society of Echocardiography Consensus Statement on the Clinical Applications of Ultrasonic Contrast Agents in Echocardiography. J Am Soc Echocardiogr 2009; 21:1179-201; quiz 1281. [PMID: 18992671 DOI: 10.1016/j.echo.2008.09.009] [Citation(s) in RCA: 312] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
UNLABELLED ACCREDITATION STATEMENT: The American Society of Echocardiography (ASE) is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The ASE designates this educational activity for a maximum of 1 AMA PRA Category 1 Credit.trade mark Physicians should only claim credit commensurate with the extent of their participation in the activity. The American Registry of Diagnostic Medical Sonographers and Cardiovascular Credentialing International recognize the ASE's certificates and have agreed to honor the credit hours toward their registry requirements for sonographers. The ASE is committed to resolving all conflict-of-interest issues, and its mandate is to retain only those speakers with financial interests that can be reconciled with the goals and educational integrity of the educational program. Disclosure of faculty and commercial support sponsor relationships, if any, have been indicated. TARGET AUDIENCE This activity is designed for all cardiovascular physicians, cardiac sonographers, and nurses with a primary interest and knowledge base in the field of echocardiography; in addition, residents, researchers, clinicians, sonographers, and other medical professionals having a specific interest in contrast echocardiography may be included. OBJECTIVES Upon completing this activity, participants will be able to: 1. Demonstrate an increased knowledge of the applications for contrast echocardiography and their impact on cardiac diagnosis. 2. Differentiate the available ultrasound contrast agents and ultrasound equipment imaging features to optimize their use. 3. Recognize the indications, benefits, and safety of ultrasound contrast agents, acknowledging the recent labeling changes by the US Food and Drug Administration (FDA) regarding contrast agent use and safety information. 4. Identify specific patient populations that represent potential candidates for the use of contrast agents, to enable cost-effective clinical diagnosis. 5. Incorporate effective teamwork strategies for the implementation of contrast agents in the echocardiography laboratory and establish guidelines for contrast use. 6. Use contrast enhancement for endocardial border delineation and left ventricular opacification in rest and stress echocardiography and unique patient care environments in which echocardiographic image acquisition is frequently challenging, including intensive care units (ICUs) and emergency departments. 7. Effectively use contrast echocardiography for the diagnosis of intracardiac and extracardiac abnormalities, including the identification of complications of acute myocardial infarction. 8. Assess the common pitfalls in contrast imaging and use stepwise, guideline-based contrast equipment setup and contrast agent administration techniques to optimize image acquisition.
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Left Ventricle Segmentation from Contrast Enhanced Fast Rotating Ultrasound Images Using Three Dimensional Active Shape Models. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/978-3-642-01932-6_32] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Wei K, Mulvagh SL, Carson L, Davidoff R, Gabriel R, Grimm RA, Wilson S, Fane L, Herzog CA, Zoghbi WA, Taylor R, Farrar M, Chaudhry FA, Porter TR, Irani W, Lang RM. The safety of deFinity and Optison for ultrasound image enhancement: a retrospective analysis of 78,383 administered contrast doses. J Am Soc Echocardiogr 2008; 21:1202-6. [PMID: 18848430 DOI: 10.1016/j.echo.2008.07.019] [Citation(s) in RCA: 181] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Indexed: 12/24/2022]
Abstract
BACKGROUND The purpose of this retrospective analysis was to define the incidence of severe adverse events after exposure to ultrasound contrast agents. METHODS Data between January 1, 2001, and September 30, 2007, were collected using invited responses to an on-line web-based questionnaire from 1 general and 12 cardiac ultrasound laboratories. During a period of 4.5 +/- 2.4 years, a total of 66,164 doses of Definity (Lantheus Medical Imaging, North Billerica, MA) and 12,219 doses of Optison (GE Healthcare, Buckinghamshire, UK) were administered, reflecting contrast use in 5% of transthoracic and 28% of stress echocardiographic procedures. More than 10,000 doses were given to critically ill patients in intensive care unit settings or to patients with acute chest pain of suspected cardiac origin. The median age of patients who received an ultrasound contrast agent was 60 years, 49% were male, and the mean body mass index was 32 +/- 1.4 g/m(-2). RESULTS Severe reactions that were considered "probably" related to an ultrasound contrast agent developed in 8 patients (0.01%), all of whom were outpatients, and 4 (0.006%) of these were consistent with anaphylactoid reactions. There were no deaths reported. All patients recovered with treatment. No serious events were seen in inpatients. CONCLUSION This multicenter, retrospective analysis includes the largest number of doses of ultrasound contrast agents ever published and a large number of patients evaluated in a wide variety of settings, including the critically ill. It shows that these agents have a good safety profile in both cardiac and abdominal ultrasound applications. The incidence of severe adverse reactions to ultrasound contrast agents is no greater, and may be lower, than that reported for contrast agents commonly used in other cardiac imaging tests.
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Affiliation(s)
- Kevin Wei
- Oregon Health and Science University, Portland, Oregon 97239, USA.
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Dittrich MT, Epperly WC, Kopelen H, Strachan GM, Harden M, Sandelski J, Mahrous H, Belcik T. Evaluation and Optimization of Real-Time Perfusion Imaging Using Multiple Ultrasound Systems With Imagify Microspheres. JOURNAL OF DIAGNOSTIC MEDICAL SONOGRAPHY 2008. [DOI: 10.1177/8756479308324035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Current commercially available ultrasound systems have proprietary contrast-specific imaging modes to evaluate myocardial contrast enhancement (MCE). Each of these modes uses a different pulsing scheme and has unique system terminology and a proprietary name. The aim of this study was to determine optimal system settings and MCE duration using Imagify (perflubutane polymer microspheres), a new ultrasound imaging agent undergoing development for perfusion stress echocardiography to detect coronary artery disease. Thirty-nine patients were enrolled. Four ultrasound systems with real-time, low mechanical index (nonlinear, multi-pulse) modes were evaluated. Optimal MCE settings were determined qualitatively in the apical views through systematic adjustment of multiple settings while maintaining a frame rate consistent with stress echocardiography to produce high-intensity (bright-hyperechoic), transmural myocardial enhancement. When using the clinical dose of Imagify during real-time imaging, the optimized settings for three ultrasound systems allowed prolonged, clinically useful MCE with a mean duration of 9.5 minutes.
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Affiliation(s)
| | | | - Helen Kopelen
- Clinical Research, Acusphere, Inc., Watertown, Massachusetts
| | | | | | | | - Heidi Mahrous
- University of Nebraska Medical Center, Omaha, Nebraska
| | - Todd Belcik
- Oregon Health Sciences University, Portland, Oregon
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Senior R, Becher H, Monaghan M, Agati L, Zamorano J, Vanoverschelde JL, Nihoyannopoulos P. Contrast echocardiography: evidence-based recommendations by European Association of Echocardiography. EUROPEAN JOURNAL OF ECHOCARDIOGRAPHY 2008; 10:194-212. [DOI: 10.1093/ejechocard/jep005] [Citation(s) in RCA: 246] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Becher H. Contrast agents for echocardiographic studies within 24 h after myocardial infarction. EUROPEAN JOURNAL OF ECHOCARDIOGRAPHY 2008; 9:719-20. [DOI: 10.1093/ejechocard/jen220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Lester SJ, Miller FA, Khandheria BK. Contrast Echocardiography: Beyond a Black Box Warning? J Am Soc Echocardiogr 2008; 21:417-8. [DOI: 10.1016/j.echo.2008.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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