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Hillner R, Perry L, Hill N, Badheka AV, Chivukula VK. EXCOR membrane motion analyzer (EMMA) to quantify and assess hemodynamic performance of the EXCOR pediatric heart assist device. Perfusion 2024:2676591241265052. [PMID: 39034158 DOI: 10.1177/02676591241265052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
BACKGROUND Pediatric heart failure is associated with high mortality rates and is a current clinical burden. There is only one FDA approved pediatric VAD, Berlin Heart EXCOR, for treatment. Thrombo-embolic complications are a significant clinical challenge, which can lead to devastating complications such as stroke and impair efficient EXCOR function. Currently, clinicians perform largely qualitative periodic assessment of EXCOR operation by observing the motion of a rapidly moving membrane, which can be prone to human error and can lead to missing out on crucial information. METHODS In this study, we design and implement a quantitative early warning system for accurate and quantitative assessment of the EXCOR membrane, named EXCOR Membrane Motion Analyzer (EMMA). Using a combination of image analysis, computer vision and custom designed algorithm, we perform rigorous frame by frame analysis of EXCOR membrane video data. We developed specialized metrics to identify relative smoothness between successive peaks, time between peaks and overall smoothness indicators to quantify and compare between multiple cases. RESULTS Our results demonstrate that EMMA can successfully identify the motion and wrinkles on each video frame and quantify the smoothness and identify the phases of each cardiac cycle. Moreover, EMMA can obtain the smoothness of each frame and the temporal evolution of membrane smoothness across all image frames for the video sequence. CONCLUSIONS EMMA allows for a fast, accurate, quantitative assessment to be completed and reduces user error. This enables EMMA to be used effectively as an early warning system to rapidly identify device abnormalities.
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Affiliation(s)
- Rachel Hillner
- Biomedical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL, USA
| | - Luke Perry
- Biomedical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL, USA
| | - Natalie Hill
- Biomedical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL, USA
| | - Aditya V Badheka
- Division of Pediatric Intensive Care, Department of Pediatrics, University of Iowa Stead Family Children's Hospital, Iowa City, IA, USA
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Almond CS, Davies R, Adachi I, Richmond M, Law S, Tunuguntla H, Mao C, Shaw F, Lantz J, Wearden PD, Jordan LC, Ichord RN, Burns K, Zak V, Magnavita A, Gonzales S, Conway J, Jeewa A, Freemon D'A, Stylianou M, Sleeper L, Dykes JC, Ma M, Fynn-Thompson F, Lorts A, Morales D, Vanderpluym C, Dasse K, Patricia Massicotte M, Jaquiss R, Mahle WT. A prospective multicenter feasibility study of a miniaturized implantable continuous flow ventricular assist device in smaller children with heart failure. J Heart Lung Transplant 2024; 43:889-900. [PMID: 38713124 DOI: 10.1016/j.healun.2024.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 01/15/2024] [Accepted: 02/03/2024] [Indexed: 05/08/2024] Open
Abstract
BACKGROUND There is no FDA-approved left ventricular assist device (LVAD) for smaller children permitting routine hospital discharge. Smaller children supported with LVADs typically remain hospitalized for months awaiting heart transplant-a major burden for families and a challenge for hospitals. We describe the initial outcomes of the Jarvik 2015, a miniaturized implantable continuous flow LVAD, in the NHLBI-funded Pumps for Kids, Infants, and Neonates (PumpKIN) study, for bridge-to-heart transplant. METHODS Children weighing 8 to 30 kg with severe systolic heart failure and failing optimal medical therapy were recruited at 7 centers in the United States. Patients with severe right heart failure and single-ventricle congenital heart disease were excluded. The primary feasibility endpoint was survival to 30 days without severe stroke or non-operational device failure. RESULTS Of 7 children implanted, the median age was 2.2 (range 0.7, 7.1) years, median weight 10 (8.2 to 20.7) kilograms; 86% had dilated cardiomyopathy; 29% were INTERMACS profile 1. The median duration of Jarvik 2015 support was 149 (range 5 to 188) days where all 7 children survived including 5 to heart transplant, 1 to recovery, and 1 to conversion to a paracorporeal device. One patient experienced an ischemic stroke on day 53 of device support in the setting of myocardial recovery. One patient required ECMO support for intractable ventricular arrhythmias and was eventually transplanted from paracorporeal biventricular VAD support. The median pump speed was 1600 RPM with power ranging from 1-4 Watts. The median plasma free hemoglobin was 19, 30, 19 and 30 mg/dL at 7, 30, 90 and 180 days or time of explant, respectively. All patients reached the primary feasibility endpoint. Patient-reported outcomes with the device were favorable with respect to participation in a full range of activities. Due to financial issues with the manufacturer, the study was suspended after consent of the eighth patient. CONCLUSION The Jarvik 2015 LVAD appears to hold important promise as an implantable continuous flow device for smaller children that may support hospital discharge. The FDA has approved the device to proceed to a 22-subject pivotal trial. Whether this device will survive to commercialization remains unclear because of the financial challenges faced by industry seeking to develop pediatric medical devices. (Supported by NIH/NHLBI HHS Contract N268201200001I, clinicaltrials.gov 02954497).
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Affiliation(s)
| | - Ryan Davies
- University of Texas Southwestern, Dallas, Texas
| | - Iki Adachi
- Texas Children's Hospital, Houston, Texas
| | | | | | | | - Chad Mao
- Children's Healthcare of Atlanta, Atlanta, Georgia
| | - Fawwaz Shaw
- Children's Healthcare of Atlanta, Atlanta, Georgia
| | - Jodie Lantz
- University of Texas Southwestern, Dallas, Texas
| | | | - Lori C Jordan
- Vanderbilt University Medical Center, Nashville, Tennessee
| | | | - Kristin Burns
- National Heart, Lung, and Blood Institute, Bethesda, Maryland
| | | | | | - Selena Gonzales
- Stanford University School of Medicine, Palo Alto, California
| | | | - Aamir Jeewa
- Toronto Sick Kids Hospital, Toronto, Ontario, Canada
| | | | - Mario Stylianou
- National Heart, Lung, and Blood Institute, Bethesda, Maryland
| | - Lynn Sleeper
- Boston Children's Hospital, Boston, Massachusetts
| | - John C Dykes
- Stanford University School of Medicine, Palo Alto, California
| | - Michael Ma
- Stanford University School of Medicine, Palo Alto, California
| | | | - Angela Lorts
- Cinciannati Children's Hospital, Cincinnati, Ohio
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Mikulski MF, Iyer S, Well A, Mery CM, Owens WR, Glass LD, Castleberry CD, Fraser CD. Successful explantation of children from the Berlin Heart EXCOR® ventricular assist device: A systematic review. Artif Organs 2024; 48:444-455. [PMID: 38419587 DOI: 10.1111/aor.14727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 01/10/2024] [Accepted: 02/07/2024] [Indexed: 03/02/2024]
Abstract
BACKGROUND The Berlin Heart EXCOR® (BHE) can bridge children with severe heart failure to transplantation, but some are successfully weaned and spared transplantation. This study seeks to identify characteristics of children amenable to successful explantation with BHE support. METHODS Preferred Reporting Items for Systematic reviews and Meta-Analyses 2020 guidelines were used. Five databases were screened for original, English articles measuring BHE support in patients <18 years old based on title and abstract. Exclusion criteria were applied: full-text availability, <10 total pediatric BHE patients, zero successful explantations from BHE, nonprimary literature, adult and pediatric results that could not be separated, and studies with overlapping patient information. Studies were analyzed with descriptive statistics. RESULTS From 41 857 potential studies, 14 were analyzed with data from 58 hospitals on four continents from 1990 to 2020. There were 984 BHE patients. The most common diagnosis was dilated cardiomyopathy (n = 318, 32.3%), followed by congenital heart disease (n = 249, 25.3%). There were 85 (8.6%) children explanted with favorable outcomes. The underlying diagnosis was known in 44 (51.8%) cases: 14 (8.4%) of 166 cardiomyopathies, 17 (48.6%) of 35 myocarditis, and 12 (16.7%) of 72 with congenital heart disease were explanted. When the type of support was known, the rate of LVAD patients explanted was 21.3% (n = 19/89) and 2.4% (n = 1/42) of BiVAD patients were explanted. CONCLUSION Explantation from BHE is not uncommon at 8.6%, but significant variation exists in the explantation data reported. Myocarditis and LVAD support may be populations suitable for weaning. Standardization of reporting measures and prospective registries may help identify patients suitable for this alternative to transplant and help develop weaning protocols.
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Affiliation(s)
- Matthew F Mikulski
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Swati Iyer
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Andrew Well
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Carlos M Mery
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - W Richard Owens
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Lauren D Glass
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Pediatrics, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Chesney D Castleberry
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Pediatrics, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
| | - Charles D Fraser
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin and Dell Children's Medical Center, Austin, Texas, USA
- Department of Surgery and Perioperative Care, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
- Department of Pediatrics, Dell Medical School at The University of Texas at Austin, Austin, Texas, USA
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Zhu L, Yu Q, Yu L, Wang L, Yang Y, Shen P, Fan Y. Optimizing the design of axial flow pump blades based on fluid characteristics. Comput Methods Biomech Biomed Engin 2024:1-10. [PMID: 38444287 DOI: 10.1080/10255842.2024.2318011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/15/2023] [Indexed: 03/07/2024]
Abstract
Non-physiological blood flow conditions in axial blood pumps lead to some complications, including hemolysis, platelet activation, thrombosis, and embolism. The high speed of the axial blood pump destroys large amounts of erythrocytes, thereby causing hemolysis and thrombosis. Thus, this study aims to reduce the vortices and reflux in the flow field by optimizing the axial blood pump. The axial blood pump and arterial flow field were modeled by the finite element method. The blood was assumed to be incompressible, turbulent, and Newtonian. The SST k-ω turbulence model was used. The frozen rotor method was also used to calculate the snapshot of motion. Many vortices and reflux exist in the flow field of the blood pump without optimization. The improved flow field had almost no vortex and reflux, thereby reducing the exposure time of blood. The optimized blood pump had little influence on the pressure field and shear stress field. The optimized blood pump mainly reduced the vortex, reflux, and the risk of thrombosis in the flow field. The flow field characteristics of an axial blood pump were studied, and the results showed the risk of thrombosis and hemolysis in the blood pump. In accordance with the relationship between the blade shape and the flow field, the blade of the blood pump was optimized, reducing the vortex and reflux of the flow field, as well as the risk of thrombosis.
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Affiliation(s)
- Lin Zhu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Qifeng Yu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Lu Yu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuncong Yang
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Peng Shen
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- School of Biological Science and Medical Engineering, Beihang University, Beijing, China
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Rohde S, Sandica E, Veen K, Miera O, Amodeo A, Napoleone CP, Özbaran M, Sliwka J, Thiruchelvam T, Zimpfer D, Schubert S, Bogers AJJC, de By TMMH. Cerebrovascular accidents in paediatric patients supported by the Berlin Heart EXCOR. Eur J Cardiothorac Surg 2022; 62:6645748. [PMID: 35849328 PMCID: PMC9789740 DOI: 10.1093/ejcts/ezac381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 05/16/2022] [Accepted: 07/13/2022] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVES Ventricular assist device support as a bridge to transplant or recovery is a well-established therapy in children on the cardiac transplant waiting list. The goal of this study was to investigate the incidence of and the associated factors for cerebrovascular accidents in paediatric patients supported by a Berlin Heart EXCOR. METHODS All patients <19 years of age supported by a Berlin Heart EXCOR between January 2011 and January 2021 from the European Registry for Patients with Mechanical Circulatory Support were included. RESULTS In total, 230 patients were included. A total of 140 (60.9%) patients had a diagnosis of dilated cardiomyopathy. 46 patients (20.0%) sustained 55 cerebrovascular accidents, with 70.9% of the episodes within 90 days after the ventricular assist device was implanted. The event rate of cerebrovascular accidents was highest in the first era (0.75). Pump thrombosis and secondary need for a right ventricular assist device were found to be associated with a cerebrovascular accident (hazard ratio 1.998, P = 0.040; hazard ratio 11.300, P = 0.037). At the 1-year follow-up, 44.4% of the patients had received a transplant, 13.1% were weaned after recovery and 24.5% had died. Event rates for mortality showed a significantly decreasing trend. CONCLUSIONS Paediatric ventricular assist device support is associated with important adverse events, especially in the early phase after the device is implanted. Pump thrombosis and the need for a secondary right ventricular assist device are associated with cerebrovascular accidents. Furthermore, an encouragingly high rate of recovery in this patient population was shown, and death rates declined. More complete input of data into the registry, especially concerning anticoagulation protocols, would improve the data.
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Affiliation(s)
- Sofie Rohde
- Corresponding author. Department of Cardio-thoracic surgery, Erasmus University Medical Center, Rotterdam, The Netherlands. e-mail: (S. Rohde)
| | | | - Kevin Veen
- Department of Cardio-thoracic surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Oliver Miera
- Department of Congenital Heart Disease and Pediatric Cardiology, Deutsches Herzzentrum Berlin, Berlin, Germany
| | | | - Carlo Pace Napoleone
- Pediatric Cardiac Surgery Department, Regina Margherita Children’s Hospital, Torino, Italy
| | | | - Joanna Sliwka
- Department of Cardiac Surgery, Transplantology and Vascular Surgery, Silesian Center for Heart Diseases, Zabrze, Poland
| | | | | | - Stephan Schubert
- Center of Congenital Heart Disease/Pediatric Cardiology, Heart and Diabetes Center North Rhine Westfalia, Ruhr-University of Bochum, Bad Oeynhausen, Germany
| | - Ad J J C Bogers
- Department of Cardio-thoracic surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
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Komori M, Hoashi T, Sakaguchi H, Imai K, Okuda N, Fukushima N, Kurosaki K, Ichikawa H. OUP accepted manuscript. Interact Cardiovasc Thorac Surg 2022; 35:6545045. [PMID: 35260893 PMCID: PMC9252124 DOI: 10.1093/icvts/ivac051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/30/2022] [Accepted: 02/17/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Motoki Komori
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Takaya Hoashi
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
- Corresponding author. Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, 6-1, Kishibe-Shimmachi, Suita, Osaka 564-8565, Japan. Tel: +81-6-6170-1070; fax: +81-6-6170-1348; e-mail: (T. Hoashi)
| | - Heima Sakaguchi
- Department of Pediatric Cardiology, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Kenta Imai
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Naoki Okuda
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Norihide Fukushima
- Department of Pediatric Transplantation, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Kenichi Kurosaki
- Department of Pediatric Cardiology, National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Hajime Ichikawa
- Department of Pediatric Cardiovascular Surgery, National Cerebral and Cardiovascular Center, Osaka, Japan
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