Article
Multidisciplinary Sciences
Cristian Crisosto, Andreas Voskrebenzev, Marcel Gutberlet, Filip Klimes, Till F. Kaireit, Gesa Poehler, Tawfik Moher, Lea Behrendt, Robin Mueller, Maximilian Zubke, Frank Wacker, Jens Vogel-Claussen
Summary: This study aimed to improve automated lung segmentation on 2D lung MR images using balanced augmentation and artificially-generated consolidations for training of a convolutional neural network (CNN). The results showed that by increasing balanced augmentation and artificially-generated consolidations, the CNN performance was improved, especially in datasets with parenchymal consolidations. This is an important step towards a robust automated postprocessing of lung MRI datasets in clinical routine.
Article
Multidisciplinary Sciences
Linzheng Shi, Jacob Herrmann, Samer Bou Jawde, Jason H. T. Bates, Hadi T. Nia, Bela Suki
Summary: This study investigates the combined effects of gravity and the mechanical properties of elastin and collagen on the P-V curve in the human lung. By updating a previous model, the researchers predicted the spatial variation of the static alveolar P-V relations throughout the lung. Additionally, they introduced dynamic surface tension and collagen viscoelasticity to compute the hysteresis loop of the lung P-V curve. The model offers insights into the effects of microgravity on ventilation and provides testable predictions for future experiments.
SCIENTIFIC REPORTS
(2022)
Article
Physiology
Abhilash S. Kizhakke Puliyakote, Ann R. Elliott, Rui C. Sa, Kevin M. Anderson, Laura E. Crotty Alexander, Susan R. Hopkins
Summary: This study demonstrates that vaping-induced disruptions in ventilation-perfusion matching are present in young, healthy, asymptomatic adults with normal spirometry who habitually vape. The changes in ventilation and perfusion distributions, both at baseline and acutely after vaping, as well as the potential implications on hypoxic vasoconstriction, are crucial in understanding the pathogenesis of vaping-induced dysfunction. Using imaging-based approach provides evidence of potential subclinical alterations in lung function below thresholds of detection using spirometry.
JOURNAL OF APPLIED PHYSIOLOGY
(2021)
Article
Multidisciplinary Sciences
Yen-Fen Ko, Kuo-Sheng Cheng
Summary: Electrical impedance tomography (EIT) is commonly used for monitoring lung ventilation, but poor spatial resolution affects image reconstruction; the semi-Siamese U-Net shows performance improvement in separating heart and lung impedance images.
Article
Critical Care Medicine
Yu-xian Wang, Ming Zhong, Min-hui Dong, Jie-qiong Song, Yi-jun Zheng, Wei Wu, Jia-le Tao, Ling Zhu, Xin Zheng
Summary: This study investigated the effect of prone positioning on ventilation-perfusion matching in ARDS patients using contrast-enhanced electrical impedance tomography (EIT). The findings showed that prolonged prone ventilation improved dorsal ventilation and perfusion, resulting in improved ventilation-perfusion matching and oxygenation.
Article
Critical Care Medicine
Ruiting Li, Yongran Wu, Hongling Zhang, Azhen Wang, Xin Zhao, Shiying Yuan, Le Yang, Xiaojing Zou, You Shang, Zhanqi Zhao
Summary: The aim of this study was to investigate the physiological impact of airway pressure release ventilation (APRV) on patients with early moderate-to-severe acute respiratory distress syndrome (ARDS) by electrical impedance tomography (EIT). The results showed that APRV optimizes the distribution of ventilation and perfusion, reducing lung heterogeneity, which potentially reduces the risk of ventilator-induced lung injury.
Article
Multidisciplinary Sciences
Keir A. Forgie, Nicholas Fialka, Mubashir Khan, Max Buchko, Sanaz Hatami, Sayed Himmat, Xiao Qi, Xiuhua Wang, Katie-Marie Buswell, Ryan Edgar, Daina Domahidi, Darren H. Freed, Jayan Nagendran
Summary: Lung transplantation is an effective treatment for end-stage lung disease but is limited by donor organ shortage. Ex situ lung perfusion (ESLP) has improved donor lung utilization rates and can be validated using porcine models. The porcine lung transplantation model is easily reproducible and can be used to validate ESLP strategies and evaluate interventions.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2022)
Article
Anesthesiology
Philip J. Peyton
Summary: This study examines the partial pressure gradients and alveolar deadspace of inhaled gases during anesthesia. The results suggest that there is no significant diffusion limitation in the lung uptake of desflurane compared to nitrous oxide.
Article
Radiology, Nuclear Medicine & Medical Imaging
Gesa H. Poehler, Filip Klimes, Lea Behrendt, Andreas Voskrebenzev, Cristian Crisosto Gonzalez, Frank Wacker, Jens M. Hohlfeld, Jens Vogel-Claussen
Summary: The study aimed to evaluate the repeatability of PREFUL-MRI ventilation and perfusion parameters, with results showing high reproducibility of these parameters in two scan sessions, being observed in both healthy controls and COPD patients.
JOURNAL OF MAGNETIC RESONANCE IMAGING
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Ilyes Benlala, Rabea Klaar, Thomas Gaass, Julie Macey, Stephanie Bui, Baudouin Denis De Senneville, Patrick Berger, Francois Laurent, Gael Dournes, Julien Dinkel
Summary: This study evaluated whether Fourier decomposition (FD) functional lung MRI can detect response to treatment of allergic bronchopulmonary aspergillosis (ABPA) in cystic fibrosis (CF) patients. The results showed that non-contrast-enhanced FD lung MRI can reproducibly assess the response to ABPA treatment in CF patients and correlates with pulmonary function test obstructive parameters.
JOURNAL OF MAGNETIC RESONANCE IMAGING
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Pierre-Yves Le Roux, Pierre-Benoit Bonnefoy, Achraf Bahloul, Benoit Denizot, Bertrand Barres, Caroline Moreau-Triby, Astrid Girma, Amandine Pallardy, Quentin Ceyrat, Laure Sarda-Mantel, Micheline Razzouk-Cadet, Reka Zsigmond, Cachin Florent, Gilles Karcher, Pierre-Yves Salaun
Summary: This study assessed the role of ventilation imaging in COVID-19 patients undergoing lung scintigraphy for suspected pulmonary embolism (PE). The findings showed that in this population, only 57% of patients could confidently exclude PE without ventilation imaging, while 31% of patients required ventilation imaging to rule out PE. The study also revealed a low prevalence of PE (12%).
JOURNAL OF NUCLEAR MEDICINE
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Efe Ilicak, Greta Thater, Safa Ozdemir, Jascha Zapp, Lothar R. Schad, Stefan O. Schoenberg, Frank G. Zoellner, Meike Weis
Summary: This study investigated the feasibility of non-contrast-enhanced functional lung imaging in 2-year-old children after congenital diaphragmatic hernia repair. The results showed that this method successfully generated ventilation and perfusion maps, and the results were consistent with dynamic contrast-enhanced MRI. This method provides a new option for lung imaging in CDH patients without the need for ionizing radiation or contrast agents.
EUROPEAN RADIOLOGY
(2023)
Article
Multidisciplinary Sciences
Alessandra F. Thompson, Lillian Moraes, Nazareth N. Rocha, Marcos V. S. Fernandes, Mariana A. Antunes, Soraia C. Abreu, Cintia L. Santos, Vera L. Capelozzi, Cynthia S. Samary, Marcelo G. de Abreu, Felipe Saddy, Paolo Pelosi, Pedro L. Silva, Patricia R. M. Rocco
Summary: The study found that adjusting the frequency of controlled breaths and the level of pressure support can mitigate lung and diaphragm damage in an animal model of acute respiratory distress syndrome. Increasing pressure support can improve lung mechanics and reduce lung injury, while partitioning inspiratory effort and pressure in spontaneous breathing can minimize lung and diaphragm damage.
Article
Radiology, Nuclear Medicine & Medical Imaging
Rie Tanaka, Isao Matsumoto, Masaya Tamura, Munehisa Takata, Shuhei Yoshida, Daisuke Saito, Yusuke Tanaka, Dai Inoue, Noriyuki Ohkura, Kazuo Kasahara
Summary: The study compared ventilation and perfusion metrics derived from DCR with nuclear medicine imaging findings, finding a reasonably good correlation in lung subdivisions. This suggests that DCR can provide useful information on pulmonary function without the use of radioactive contrast agents.
QUANTITATIVE IMAGING IN MEDICINE AND SURGERY
(2021)
Article
Physiology
Gabriel C. Motta-Ribeiro, Tilo Winkler, Eduardo L. V. Costa, Nicolas de Prost, Mauro R. Tucci, Marcos F. Vidal Melo
Summary: Lung perfusion redistribution is associated with increased inflammation, nondependent capillary obliteration, and lung derecruitment susceptibility depending on endotoxemia level and ventilation strategy during pre-ARDS protective ventilation in animals.
JOURNAL OF APPLIED PHYSIOLOGY
(2023)
Review
Medicine, Research & Experimental
Alys R. Clark, Tet Chuan Lee, Joanna L. James
Summary: In pregnancy, fetal growth is supported by the placenta, which is nourished by maternal blood. Understanding normal vascular anatomy and placental exchange function is key to predicting and detecting pregnancy pathologies, but faces challenges due to limitations in imaging modalities and the inaccessibility of the pregnant uterus. Computational approaches provide an opportunity to connect anatomical changes to function and guide clinical focus, but also present challenges in scaling detailed models to reflect organ level function.
WIRES MECHANISMS OF DISEASE
(2021)
Article
Neurosciences
Sophie Couper, Alys Clark, John M. D. Thompson, Dimitra Flouri, Rosalind Aughwane, Anna L. David, Andrew Melbourne, Ali Mirjalili, Peter R. Stone
Summary: Research demonstrates that maternal supine sleep position in late pregnancy is associated with reduced oxygen transfer and blood flow to the fetus, increasing the risk of stillbirth, although the specific mechanisms remain unclear.
JOURNAL OF PHYSIOLOGY-LONDON
(2021)
Article
Pediatrics
Alys R. Clark, Emily Jungmin Her, Russell Metcalfe, Catherine A. Byrnes
Summary: Digital analysis of chest X-rays can accurately identify bronchiectasis features, providing a potentially low-cost and readily available tool for indicating the need for diagnostic CT and ongoing disease monitoring. The study found that structural changes in CT were reflected in CXRs, with CXR analysis showing better correlation to CT measures of abnormality than standard radiological scoring.
EUROPEAN JOURNAL OF PEDIATRICS
(2021)
Article
Developmental Biology
Vijayalakshmi Srinivasan, Andrew Melbourne, Charlotte Oyston, Joanna L. James, Alys R. Clark
Summary: Placental structures at different scales are crucial, and quantifying their evolution is important for clinical diagnosis and pathophysiological understanding. Imaging techniques provide rich information, and advancements in imaging technologies and computational algorithms help enhance our understanding of placental function.
Article
Developmental Biology
Joanna L. James, Anna L. Boss, Cherry Sun, Hanna H. Allerkamp, Alys R. Clark
Summary: Early placental development is critical for a healthy pregnancy, and deficiencies in this early development can lead to disorders such as fetal growth restriction. This review explores the importance of early placental development across various anatomical aspects of placentation.
Article
Cardiac & Cardiovascular Systems
Hanna H. Allerkamp, Teagan Pole, Ali Boukham, Joanna L. James, Alys R. Clark
Summary: This study presents an integrated assessment of uterine radial arteries, which are likely rate limiters of maternal blood flow to the placenta. The study demonstrates that uterine radial arteries behave differently from other systemic vessels and change in pregnancy. This provides a useful tool to understand the role of uterine vascular adaptation in normal and abnormal pregnancies.
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
(2022)
Review
Cardiac & Cardiovascular Systems
Sara Moazzam, Lomani A. O'Hagan, Alys R. Clarke, Maxim Itkin, Anthony R. J. Phillips, John A. Windsor, S. Ali Mirjalili
Summary: The cisterna chyli is an important lymphatic structure that receives lymph drainage from various parts of the body, and plays a key role in interventional procedures. However, its anatomy shows significant variation, making accurate detection and assessment challenging.
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
(2022)
Article
Cardiac & Cardiovascular Systems
E. T. Ashworth, K. S. Burrowes, A. R. Clark, B. S. Shaarbaf Ebrahimi, M. H. Tawhai
Summary: The role of pulmonary lymphatics in lung fluid homeostasis and its interaction with cardiovascular pressures are poorly understood. Computational modeling provides a unique perspective to analyze fluid movement in the cardiopulmonary vasculature. This study presents a novel approach to understanding the interaction between cardiac dysfunction and pulmonary lymphatic function.
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
(2023)
Review
Medicine, Research & Experimental
Robyn W. May, Gonzalo Maso D. Talou, Alys R. Clark, Jonathan P. Mynard, Joseph J. Smolich, Pablo J. Blanco, Lucas O. Mueller, Thomas L. Gentles, Frank H. Bloomfield, Soroush Safaei
Summary: Computational modeling is widely used in the study of cardiovascular hemodynamics for medical research and improving the diagnosis and treatment of cardiovascular diseases. Most existing cardiovascular models focus on the adult circulatory system, but the perinatal period is unique as cardiovascular physiology undergoes significant changes. This review discusses computational models of the cardiovascular system in early life, their applications, and proposes a roadmap for developing an open-source model spanning fetal, perinatal, and postnatal periods.
WIRES MECHANISMS OF DISEASE
(2023)
Article
Cardiac & Cardiovascular Systems
H. H. Allerkamp, S. Leighton, T. Pole, A. R. Clark, J. L. James
Summary: Placenta-specific paracrine factors, such as beta-estradiol, progesterone, and placental growth factor, can attenuate flow-mediated constriction of uterine radial arteries, allowing higher flow rates during pregnancy. This effect is mediated in part by nitric oxide production. Computational models predict that a synergistic combination of paracrine factors and shear stress is necessary for sufficient levels of nitric oxide during early human pregnancy, triggering appropriate uterine vascular adaptation.
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
(2023)
Article
Engineering, Biomedical
Mitchell I. Page, Ruanui Nicholson, Merryn H. Tawhai, Alys R. Clark, Haribalan Kumar
Summary: This study developed a statistical shape model (SSM) to enhance the accuracy and reliability of electrical impedance tomography (EIT) reconstruction of lung ventilation. However, using patient-specific structural information did not show conclusive improvement. This research bears significance in the field of ventilation monitoring using EIT.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Neurosciences
Devanshi Jani, Alys Clark, Sophie Couper, John M. D. Thompson, Anna L. L. David, Andrew Melbourne, Ali Mirjalili, Anna-Maria Lydon, Peter R. R. Stone
Summary: Fetal growth restriction (FGR) and maternal supine going-to-sleep position are both risk factors for late stillbirth. This study used MRI to quantify the effect of maternal supine position on maternal-placental and fetoplacental blood flow, placental oxygen transfer, and fetal oxygenation in FGR and healthy pregnancies. It was found that FGR was associated with lower fetal oxygen saturation and reduced blood flow, while maternal supine positioning caused a further reduction in fetal oxygenation, particularly in FGR pregnancies.
JOURNAL OF PHYSIOLOGY-LONDON
(2023)
Review
Health Care Sciences & Services
Stephanie J. Woodley, Brittany Moller, Alys R. Clark, Melanie D. Bussey, Bahram Sangelaji, Meredith Perry, Jennifer Kruger
Summary: This article investigates the use of digital technologies in the management of urinary incontinence in women. The study found that digital technologies have some effectiveness in managing symptoms, but there are still some shortcomings in adapting to women at different stages of life and considering cultural factors.
JMIR MHEALTH AND UHEALTH
(2023)
Article
Biology
Alys R. Clark, Hanna Fontinha, John Thompson, Sophie Couper, Devanshi Jani, Ali Mirjalili, Laura Bennet, Peter Stone
Summary: Pregnancy leads to significant changes in the maternal cardiovascular-circulatory system, which are necessary for the adaptions required during pregnancy and lactation. This study focuses on the maternal cardiovascular autonomic responses to pregnancy and position, and shows that these responses change significantly throughout gestation. The study also highlights the impact of position on maternal hemodynamic parameters, specifically the relationship between supine position and compression of the inferior vena cava. Overall, this research provides new insights into the physiology of physiological stressors related to position during pregnancy.
Article
Cardiac & Cardiovascular Systems
Behdad Shaarbaf Ebrahimi, Merryn H. Tawhai, Haribalan Kumar, Kelly S. Burrowes, Eric A. Hoffman, Margaret L. Wilsher, David Milne, Alys R. Clark
Summary: Pulmonary hypertension, with multiple etiologies, presents challenges in diagnosis, prognosis, and treatment. Invasive hemodynamic measurements provide diagnosis but dynamic assessment is needed to differentiate disease phenotypes. Models can help understand differences in pulmonary vascular response, but non-linear relationships between data and structural changes may complicate analysis for distinguishing between cohorts.
PULMONARY CIRCULATION
(2021)