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Krishnaswamy RJ, Robson D, Gunawan A, Ramanayake A, Barua S, Jain P, Adji A, Macdonald PS, Hayward CS, Muthiah K. Using pulsatility responses to breath-hold maneuvers to predict readmission rates in continuous-flow left ventricular assist device patients. Artif Organs 2024; 48:70-82. [PMID: 37819003 DOI: 10.1111/aor.14644] [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: 04/26/2023] [Revised: 07/18/2023] [Accepted: 09/05/2023] [Indexed: 10/13/2023]
Abstract
BACKGROUND Dynamic respiratory maneuvers induce heterogenous changes to flow-pulsatility in continuous-flow left ventricular assist device patients. We evaluated the association of these pulsatility responses with patient hemodynamics and outcomes. METHODS Responses obtained from HVAD (Medtronic) outpatients during successive weekly clinics were categorized into three ordinal groups according to the percentage reduction in flow-waveform pulsatility (peak-trough flow) upon inspiratory-breath-hold, (%∆P): (1) minimal change (%∆P ≤ 50), (2) reduced pulsatility (%∆P > 50 but <100), (3) flatline (%∆P = 100). Same-day echocardiography and right-heart-catheterization were performed. Readmissions were compared between patients with ≥1 flatline response (F-group) and those without (NF-group). RESULTS Overall, 712 responses were obtained from 55 patients (82% male, age 56.4 ± 11.5). When compared to minimal change, reduced pulsatility and flatline responses were associated with lower central venous pressure (14.2 vs. 11.4 vs. 9.0 mm Hg, p = 0.08) and pulmonary capillary wedge pressure (19.8 vs. 14.3 vs. 13.0 mm Hg, p = 0.03), lower rates of ≥moderate mitral regurgitation (48% vs. 13% vs. 10%, p = 0.01), lower rates of ≥moderate right ventricular impairment (62% vs. 25% vs. 27%, p = 0.03), and increased rates of aortic valve opening (32% vs. 50% vs. 75%, p = 0.03). The F-group (n = 28) experienced numerically lower all-cause readmissions (1.51 vs. 2.79 events-per-patient-year [EPPY], hazard-ratio [HR] = 0.67, p = 0.12), reduced heart failure readmissions (0.07 vs. 0.57 EPPY, HR = 0.15, p = 0.008), and superior readmission-free survival (HR = 0.47, log-rank p = 0.04). Syncopal readmissions occurred exclusively in the F-group (0.20 vs. 0 EPPY, p = 0.01). CONCLUSION Responses to inspiratory-breath-hold predicted hemodynamics and readmission risk. The impact of inspiratory-breath-hold on pulsatility can non-invasively guide hemodynamic management decisions, patient optimization, and readmission risk stratification.
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Affiliation(s)
- Rohan Joshua Krishnaswamy
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Desiree Robson
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Aaron Gunawan
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Anju Ramanayake
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Sumita Barua
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
| | - Pankaj Jain
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
| | - Audrey Adji
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
| | - Peter Simon Macdonald
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
| | - Christopher Simon Hayward
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
| | - Kavitha Muthiah
- Heart and Lung Transplant Unit, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
- Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales, Australia
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Wu EL, Maw M, Stephens AF, Stevens MC, Fraser JF, Tansley G, Moscato F, Gregory SD. Estimation of Left Ventricular Stroke Work for Rotary Left Ventricular Assist Devices. ASAIO J 2023; 69:817-826. [PMID: 37191479 DOI: 10.1097/mat.0000000000001972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
Continuous monitoring of left ventricular stroke work (LVSW) may improve the medical management of patients with rotary left ventricular assist devices (LVAD). However, implantable pressure-volume sensors are limited by measurement drift and hemocompatibility. Instead, estimator algorithms derived from rotary LVAD signals may be a suitable alternative. An LVSW estimator algorithm was developed and evaluated in a range of in vitro and ex vivo cardiovascular conditions during full assist (closed aortic valve [AoV]) and partial assist (opening AoV) mode. For full assist, the LVSW estimator algorithm was based on LVAD flow, speed, and pump pressure head, whereas for partial assist, the LVSW estimator combined the full assist algorithm with an estimate of AoV flow. During full assist, the LVSW estimator demonstrated a good fit in vitro and ex vivo (R 2 : 0.97 and 0.86, respectively) with errors of ± 0.07 J. However, LVSW estimator performance was reduced during partial assist, with in vitro : R 2 : 0.88 and an error of ± 0.16 J and ex vivo : R 2 : 0.48 with errors of ± 0.11 J. Further investigations are required to improve the LVSW estimate with partial assist; however, this study demonstrated promising results for a continuous estimate of LVSW for rotary LVADs.
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Affiliation(s)
- Eric L Wu
- From the Innovative Cardiovascular Engineering and Technology Laboratory (ICETLAB), Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia
- School of Medicine, The University of Queensland, Queensland, Brisbane, Australia
| | - Martin Maw
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Andrew F Stephens
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia
- Cardio-Respiratory Engineering and Technology Laboratory, Baker Heart and Diabetes Institute, Alfred Hospital, Melbourne, Australia
| | - Michael C Stevens
- From the Innovative Cardiovascular Engineering and Technology Laboratory (ICETLAB), Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales, Sydney, New South Wales, Australia
| | - John F Fraser
- From the Innovative Cardiovascular Engineering and Technology Laboratory (ICETLAB), Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia
- School of Medicine, The University of Queensland, Queensland, Brisbane, Australia
| | - Geoffrey Tansley
- From the Innovative Cardiovascular Engineering and Technology Laboratory (ICETLAB), Critical Care Research Group, The Prince Charles Hospital, Chermside, Queensland, Australia
- School of Engineering and Built Environment, Griffith University, Gold Coast, Australia
| | - Francesco Moscato
- Ludwig Boltzmann Institute for Cardiovascular Research, Vienna, Austria
- Austrian Cluster for Tissue Regeneration, Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria
| | - Shaun D Gregory
- Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia
- Cardio-Respiratory Engineering and Technology Laboratory, Baker Heart and Diabetes Institute, Alfred Hospital, Melbourne, Australia
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Rocchi M, Gross C, Moscato F, Schlöglhofer T, Meyns B, Fresiello L. An in vitro model to study suction events by a ventricular assist device: validation with clinical data. Front Physiol 2023; 14:1155032. [PMID: 37560156 PMCID: PMC10407082 DOI: 10.3389/fphys.2023.1155032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 07/11/2023] [Indexed: 08/11/2023] Open
Abstract
Introduction: Ventricular assist devices (LVADs) are a valuable therapy for end-stage heart failure patients. However, some adverse events still persist, such as suction that can trigger thrombus formation and cardiac rhythm disorders. The aim of this study is to validate a suction module (SM) as a test bench for LVAD suction detection and speed control algorithms. Methods: The SM consists of a latex tube, mimicking the ventricular apex, connected to a LVAD. The SM was implemented into a hybrid in vitro-in silico cardiovascular simulator. Suction was induced simulating hypovolemia in a profile of a dilated cardiomyopathy and of a restrictive cardiomyopathy for pump speeds ranging between 2,500 and 3,200 rpm. Clinical data collected in 38 LVAD patients were used for the validation. Clinical and simulated LVAD flow waveforms were visually compared. For a more quantitative validation, a binary classifier was used to classify simulated suction and non-suction beats. The obtained classification was then compared to that generated by the simulator to evaluate the specificity and sensitivity of the simulator. Finally, a statistical analysis was run on specific suction features (e.g., minimum impeller speed pulsatility, minimum slope of the estimated flow, and timing of the maximum slope of the estimated flow). Results: The simulator could reproduce most of the pump waveforms observed in vivo. The simulator showed a sensitivity and specificity and of 90.0% and 97.5%, respectively. Simulated suction features were in the interquartile range of clinical ones. Conclusions: The SM can be used to investigate suction in different pathophysiological conditions and to support the development of LVAD physiological controllers.
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Affiliation(s)
- Maria Rocchi
- Unit of Cardiac Surgery, Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Christoph Gross
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Francesco Moscato
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Cardiovascular Research, Vienna, Austria
- Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Thomas Schlöglhofer
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Cardiovascular Research, Vienna, Austria
| | - Bart Meyns
- Unit of Cardiac Surgery, Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Libera Fresiello
- Unit of Cardiac Surgery, Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
- Cardiovascular and Respiratory Physiology, University of Twente, Enschede, Netherlands
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Fresiello L, Muthiah K, Goetschalckx K, Hayward C, Rocchi M, Bezy M, Pauls JP, Meyns B, Donker DW, Zieliński K. Initial clinical validation of a hybrid in silico—in vitro cardiorespiratory simulator for comprehensive testing of mechanical circulatory support systems. Front Physiol 2022; 13:967449. [PMID: 36311247 PMCID: PMC9606213 DOI: 10.3389/fphys.2022.967449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Accepted: 09/07/2022] [Indexed: 11/13/2022] Open
Abstract
Simulators are expected to assume a prominent role in the process of design—development and testing of cardiovascular medical devices. For this purpose, simulators should capture the complexity of human cardiorespiratory physiology in a realistic way. High fidelity simulations of pathophysiology do not only allow to test the medical device itself, but also to advance practically relevant monitoring and control features while the device acts under realistic conditions. We propose a physiologically controlled cardiorespiratory simulator developed in a mixed in silico-in vitro simulation environment. As inherent to this approach, most of the physiological model complexity is implemented in silico while the in vitro system acts as an interface to connect a medical device. As case scenarios, severe heart failure was modeled, at rest and at exercise and as medical device a left ventricular assist device (LVAD) was connected to the simulator. As initial validation, the simulator output was compared against clinical data from chronic heart failure patients supported by an LVAD, that underwent different levels of exercise tests with concomitant increase in LVAD speed. Simulations were conducted reproducing the same protocol as applied in patients, in terms of exercise intensity and related LVAD speed titration. Results show that the simulator allows to capture the principal parameters of the main adaptative cardiovascular and respiratory processes within the human body occurring from rest to exercise. The simulated functional interaction with the LVAD is comparable to the one clinically observed concerning ventricular unloading, cardiac output, and pump flow. Overall, the proposed simulation system offers a high fidelity in silico-in vitro representation of the human cardiorespiratory pathophysiology. It can be used as a test bench to comprehensively analyze the performance of physically connected medical devices simulating clinically realistic, critical scenarios, thus aiding in the future the development of physiologically responding, patient-adjustable medical devices. Further validation studies will be conducted to assess the performance of the simulator in other pathophysiological conditions.
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Affiliation(s)
- Libera Fresiello
- Cardiovascular and Respiratory Physiology, University of Twente, Enschede, Netherlands
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
- *Correspondence: Libera Fresiello,
| | - Kavitha Muthiah
- Department of Cardiology, St Vincent’s Hospital, Sydney, NSW, Australia
| | - Kaatje Goetschalckx
- Department of Cardiovascular Diseases, University Hospitals Leuven, Leuven, Belgium
| | - Christopher Hayward
- Department of Cardiology, St Vincent’s Hospital, Sydney, NSW, Australia
- Victor Chang Cardiac Research Institute, Sydney, NSW, Australia
| | - Maria Rocchi
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Maxime Bezy
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Jo P. Pauls
- School of Engineering, Griffith University, Southport, QLD, Australia
| | - Bart Meyns
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Dirk W. Donker
- Cardiovascular and Respiratory Physiology, University of Twente, Enschede, Netherlands
- Intensive Care Center, University Medical Center Utrecht, Utrecht, Netherlands
| | - Krzysztof Zieliński
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
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Numan L, Moazeni M, Oerlemans MI, Aarts E, Van Der Kaaij NP, Asselbergs FW, Van Laake LW. Data-driven monitoring in patients on left ventricular assist device support. Expert Rev Med Devices 2022; 19:677-685. [DOI: 10.1080/17434440.2022.2132147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Lieke Numan
- Department of Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
| | - Mehran Moazeni
- Department of Methodology and Statistics, Utrecht University, Heidelberglaan 8, 3584 CS, Utrecht, the Netherlands
| | - Marish I.F.J. Oerlemans
- Department of Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
| | - Emmeke Aarts
- Department of Methodology and Statistics, Utrecht University, Heidelberglaan 8, 3584 CS, Utrecht, the Netherlands
| | - Niels P. Van Der Kaaij
- Department of Cardiothoracic Surgery, University Medical Centre Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Folkert W. Asselbergs
- Department of Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
- Institute of Cardiovascular Science, Faculty of Population Health Sciences, University College London, Gower Street, WC1E 6BT, London, UK
- Health Data Research UK and Institute of Health Informatics, University College London, Gower Street, WC1E 6BT, London, UK
- Department of Cardiology, Amsterdam Cardiovascular Sciences, Amsterdam University Medical Centre, University of Amsterdam, the Netherlands
| | - Linda W. Van Laake
- Department of Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
- Institute of Health Informatics, Faculty of Population Health Sciences, University College London, Gower Street WC1E 6BT, London, UK
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Hayward C, Adachi I, Baudart S, Davis E, Feller ED, Kinugawa K, Klein L, Li S, Lorts A, Mahr C, Mathew J, Morshuis M, Müller M, Ono M, Pagani FD, Pappalardo F, Rich J, Robson D, Rosenthal DN, Saeed D, Salerno C, Sauer AJ, Schlöglhofer T, Tops L, VanderPluym C. Global Best Practices Consensus: Long-term Management of HeartWare Ventricular Assist Device Patients. J Thorac Cardiovasc Surg 2022; 164:1120-1137.e2. [DOI: 10.1016/j.jtcvs.2022.03.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/24/2022] [Accepted: 03/24/2022] [Indexed: 11/15/2022]
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Consolo F, Pappalardo F. Future Perspectives of Mechanical Circulatory Support with Left Ventricular Assist Devices: Lessons Learned from the HeartWare Ventricular Assist Device. ASAIO J 2022; 68:1-2. [PMID: 34772848 DOI: 10.1097/mat.0000000000001615] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Filippo Consolo
- From the Università Vita Salute San Raffaele, Milano, Italy
- Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milano, Italy
| | - Federico Pappalardo
- Cardiothoracic and Vascular Anesthesia and Intensive Care, AO SS. Antonio e Biagio e Cesare Arrigo, Alessandria, Italy
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