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1. Neurophysiological and paraspinal oximetry monitoring to detect spinal cord ischemia in patients during and after descending aortic repair: An international multicenter explorative study

Author

Cheryl N. Oostveen, Patrick W. Weerwind, Paul P.E. Bergs, Jürg Schmidli, Roman Bühlmann, Joerg C. Schefold, Balthasar Eberle, Jolanda Consiglio, Gereon Schälte, Drosos Kotelis, Angelique W.H. Hollands, Wolfgang F.F.A. Buhre, Geert Willem H. Schurink, Michael J. Jacobs, Walther N.K.A. van Mook, Werner H. Mess, and Nadia A. Sutedja

Subjects
Medicine (General), R5-920
Abstract

Background: During descending aortic repair, critically decreased blood flow to the myelum can result in ischemic spinal cord injury and transient or permanent paraplegia. Assessment of motor evoked potentials (MEPs) has been shown to be a valuable tool which allows to detect spinal cord ischemia (SCI) intraoperatively within a therapeutic window suitable to prevent progression to paraparesis or paraplegia. MEP monitoring is not feasible during postoperative care in the awakening patient. Therefore, ancillary techniques to monitor integrity of spinal cord function are needed to detect delayed spinal cord ischemia. Objective: The purpose of this study is to evaluate whether assessment of long loop reflexes (LLR; F-waves) and paraspinal muscle oximetry using Near-Infrared Spectroscopy (NIRS) are feasible and valid in detecting delayed SCI. Methods: We aim to include patients from three tertiary referral centers undergoing aortic repair with MEP monitoring in this study.F-wave measurements and paraspinal NIRS oximetry will be operated intra- and postoperatively. Measurement characteristics and feasibility will be assessed in the first 25 patients. Subsequently, a second cohort of 75 patients will be investigated to determine the sensitivity and specificity of F-waves and NIRS in detecting perioperative SCI. In this context for the MEP group SCI is defined intraoperatively as significant MEP changes and postoperatively as newly developed paraplegia. Conclusions: A clinical study design and protocol is proposed to assess if F-waves and/or NIRS-based paraspinal oximetry are feasible and valid in detecting and monitoring for occurrences of delayed SCI. Keywords: Spinal cord ischemia, Neurophysiological monitoring techniques, NIRS oximetry, Descending aortic repair, Thoracoabdominal aortic aneurysm repair

Published
2020
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2. An in vitro lung model to assess true shunt fraction by multiple inert gas elimination.

Author

Balamurugan Varadarajan, Andreas Vogt, Volker Hartwich, Rakesh Vasireddy, Jolanda Consiglio, Beate Hugi-Mayr, and Balthasar Eberle

Subjects
Medicine, Science
Abstract

The Multiple Inert Gas Elimination Technique, based on Micropore Membrane Inlet Mass Spectrometry, (MMIMS-MIGET) has been designed as a rapid and direct method to assess the full range of ventilation-to-perfusion (V/Q) ratios. MMIMS-MIGET distributions have not been assessed in an experimental setup with predefined V/Q-distributions. We aimed (I) to construct a novel in vitro lung model (IVLM) for the simulation of predefined V/Q distributions with five gas exchange compartments and (II) to correlate shunt fractions derived from MMIMS-MIGET with preset reference shunt values of the IVLM. Five hollow-fiber membrane oxygenators switched in parallel within a closed extracorporeal oxygenation circuit were ventilated with sweep gas (V) and perfused with human red cell suspension or saline (Q). Inert gas solution was infused into the perfusion circuit of the gas exchange assembly. Sweep gas flow (V) was kept constant and reference shunt fractions (IVLM-S) were established by bypassing one or more oxygenators with perfusate flow (Q). The derived shunt fractions (MM-S) were determined using MIGET by MMIMS from the retention data. Shunt derived by MMIMS-MIGET correlated well with preset reference shunt fractions. The in vitro lung model is a convenient system for the setup of predefined true shunt fractions in validation of MMIMS-MIGET.

Published
2017
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3. Multi frequency phase fluorimetry (MFPF) for oxygen partial pressure measurement: ex vivo validation by polarographic clark-type electrode.

Author

Stefan Boehme, Bastian Duenges, Klaus U Klein, Volker Hartwich, Beate Mayr, Jolanda Consiglio, James E Baumgardner, Klaus Markstaller, Reto Basciani, and Andreas Vogt

Subjects
Medicine, Science
Abstract

BACKGROUND: Measurement of partial pressure of oxygen (PO2) at high temporal resolution remains a technological challenge. This study introduces a novel PO2 sensing technology based on Multi-Frequency Phase Fluorimetry (MFPF). The aim was to validate MFPF against polarographic Clark-type electrode (CTE) PO2 measurements. METHODOLOGY/PRINCIPAL FINDINGS: MFPF technology was first investigated in N = 8 anaesthetised pigs at FIO2 of 0.21, 0.4, 0.6, 0.8 and 1.0. At each FIO2 level, blood samples were withdrawn and PO2 was measured in vitro with MFPF using two FOXY-AL300 probes immediately followed by CTE measurement. Secondly, MFPF-PO2 readings were compared to CTE in an artificial circulatory setup (human packed red blood cells, haematocrit of 30%). The impacts of temperature (20, 30, 40°C) and blood flow (0.8, 1.6, 2.4, 3.2, 4.0 L min(-1)) on MFPF-PO2 measurements were assessed. MFPF response time in the gas- and blood-phase was determined. Porcine MFPF-PO2 ranged from 63 to 749 mmHg; the corresponding CTE samples from 43 to 712 mmHg. Linear regression: CTE = 15.59+1.18*MFPF (R(2) = 0.93; P0.05). MFPF response-time (monoexponential) was 1.48±0.26 s for the gas-phase and 1.51±0.20 s for the blood-phase. CONCLUSIONS/SIGNIFICANCE: MFPF-derived PO2 readings were reproducible and showed excellent correlation and good agreement with Clark-type electrode-based PO2 measurements. There was no relevant impact of temperature and blood flow upon MFPF-PO2 measurements. The response time of the MFPF FOXY-AL300 probe was adequate for real-time sensing in the blood phase.

Published
2013
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4. In-hospital and 6-month outcomes in patients with COVID-19 supported with extracorporeal membrane oxygenation (EuroECMO-COVID): a multicentre, prospective observational study

Author

Roberto Lorusso, Maria Elena De Piero, Silvia Mariani, Michele Di Mauro, Thierry Folliguet, Fabio Silvio Taccone, Luigi Camporota, Justyna Swol, Dominik Wiedemann, Mirko Belliato, Lars Mikael Broman, Alain Vuylsteke, Yigal Kassif, Anna Mara Scandroglio, Vito Fanelli, Philippe Gaudard, Stephane Ledot, Julian Barker, Udo Boeken, Sven Maier, Alexander Kersten, Bart Meyns, Matteo Pozzi, Finn M Pedersen, Peter Schellongowski, Kaan Kirali, Nicholas Barrett, Jordi Riera, Thomas Mueller, Jan Belohlavek, Valeria Lo Coco, Iwan C C Van der Horst, Bas C T Van Bussel, Ronny M Schnabel, Thijs Delnoij, Gil Bolotin, Luca Lorini, Martin O Schmiady, David Schibilsky, Mariusz Kowalewski, Luis F Pinto, Pedro E Silva, Igor Kornilov, Aaron Blandino Ortiz, Leen Vercaemst, Simon Finney, Peter P Roeleveld, Matteo Di Nardo, Felix Hennig, Marta Velia Antonini, Mark Davidson, Tim J Jones, Thomas Staudinger, Peter Mair, Juliane Kilo, Christoph Krapf, Kathrin Erbert, Andreas Peer, Nikolaos Bonaros, Florian Kotheletner, Niklas Krenner Mag, Liana Shestakova, Greet Hermans, Dieter Dauwe, Philippe Meersseman, Bernard Stockman, Leda Nobile, Olivier Lhereux, Alexandre Nrasseurs, Jacques Creuter, Daniel De Backer, Simone Giglioli, Gregoire Michiels, Pierre Foulon, Matthias Raes, Inez Rodrigus, Matthias Allegaert, Philippe Jorens, Gerd Debeucklare, Michael Piagnerelli, Patrick Biston, Harlinde Peperstraete, Komeel Vandewiele, Olivier Germay, Dimitri Vandeweghe, Sven Havrin, Marc Bourgeois, Marc-Gilbert Lagny, Genette Alois, Nathalie Lavios, Benoit Misset, Romain Courcelle, Philippe J Timmermans, Alaaddin Yilmaz, Michiel Vantomout, Jerone Lehaen, Ame Jassen, Herbert Guterman, Maarten Strauven, Piet Lormans, Bruno Verhamme, catherine Vandewaeter, Frederik Bonte, Dominique Vionne, Martin Balik, Jan Blàha, Michal Lips, Michal Othal, Filip Bursa, Radim Spacek, Steffen Christensen, Vibeke Jorgensen, Marc Sorensen, Soren A Madsen, Severin Puss, Aleksandr Beljantsev, gabriel Saiydoun, Antonio Fiore, Pascal Colson, Florian Bazalgette, Xavier Capdevila, Sebastien Kollen, Laurent Muller, Jean-Francois Obadia, Pierre-Yves Dubien, Lucrezia Ajrhourh, Pierre G Guinot, Jonathan Zarka, Patricia Besserve, Maximilian V Malfertheiner, Esther Dreier, Birgit Heinze, Payam Akhyari, Artur Lichtenberg, Hug Aubin, Alexander Assman, Diyar Saeed, Holger Thiele, Matthias Baumgaertel, Jan D Schmitto, Natanov Ruslan, Axel Haverich, Matthias Thielmann, Thorsten Brenner, Arjang Ruhpawar, Christoph Benk, Martin Czerny, Dawid L Staudacher, Fridhelm Beyersdorf, Johannes Kalbhenn, Philipp Henn, Aron-Frederik Popov, Torje Iuliu, Ralf Muellenbach, Christian Reyher, Caroline Rolfes, Gosta Lotz, Michael Sonntagbauer, Helen Winkels, Julia Fichte, Robert Stohr, Sebastian Kalverkamp, Christian Karagiannidis, Simone Schafer, Alexei Svetlitchny, Hans-Bernd Hopf, Dominik Jarczak, Heinirich Groesdonk, Magdalena Rommer, Jan Hirsch, Christian Kaehny, Dimitros Soufleris, Georgios Gavriilidis, Kostantinos Pontikis, Magdalini Kyriakopoulou, Anna Kyriakoudi, Serena O'Brien, Ian Conrick-Martin, Edmund Carton, Maged Makhoul, Josef Ben-Ari, Amir Hadash, Alexander Kogan, Reut Kassif Lerner, Anas Abu-Shakra, Moshe Matan, Ahmad Balawona, Erez Kachel, Roman Altshuler, Ori Galante, Lior Fuchs, Yaniv Almog, Yaron S Ishay, Yael Lichter, Amir Gal-oz, Uri Carmi, Asaph Nini, Arie Soroksky, Hagi Dekel, Ziv Rozman, Emad Tayem, Eduard Ilgiyaev, Yuval Hochman, daniel Miltau, Avigal Rapoport, Arieh Eden, Dmitry Kompanietz, Michael Yousif, Miri Golos, Lorenzo Grazioli, Davide Ghitti, Antonio Loforte, Daniela Di Luca, Massimo Baiocchi, Davide Pacini, Antioco Cappai, Paolo Meani, Michele Mondino, Claudio F Russo, Marco Ranucci, Dario Fina, Marco Cotza, Andrea Ballotta, Giovanni Landoni, Pasquale Nardelli, Eygeny V Fominski, Luca Brazzi, Giorgia Montrucchio, Gabriele Sales, Umberto Simonetti, Sergio Livigni, Daniela Silengo, Giulia Arena, Stefania S Sovatzis, Antonella Degani, Mariachiara Riccardi, Elisa Milanesi, Giuseppe Raffa, Gennaro Martucci, Antonio Arcadipane, Giovanna Panarello, Giovanni Chiarini, Sergio Cattaneo, Carmine Puglia, Stefano Benussi, Giuseppe Foti, Marco Giani, Michela Bombino, Maria Cristina Costa, Roberto Rona, Leonello Avalli, Abele Donati, Roberto Carozza, Francesco Gasparri, Andrea Carsetti, Marco Picichè, Anna Marinello, Vinicio Danzi, Anita Zanin, Ignazio Condello, Flavio Fiore, Marco Moscarelli, Giuseppe Nasso, Giuseppe Speziale, Luca Sandrelli, Andrea Montalto, Francesco Musumeci, Alessandro Circelli, Emanuele Russo, Vanni Agnoletti, Ruggero Rociola, Aldo D Milano, Emanuele Pilato, Giuseppe Comentale, Andrea Montisci, Francesco Alessandri, Antonella Tosi, Francesco Pugliese, Giovanni Giordano, Simone Carelli, Domenico L Grieco, Antonio M Dell'Anna, Massimo Antonelli, Enrico Ramoni, Josè Zulueta, Mauro Del Giglio, Sebastiano Petracca, Pietro Bertini, Fabio Guarracino, Luigi De Simone, Paolo M Angeletti, Francesco Forfori, Francesco Taraschi, Veronica N Quintiliani, Robertas Samalavicius, Agne Jankuviene, Nadezda Scupakova, Karolis Urbonas, Juozas Kapturauskas, Gro Soerensen, Piotr Suwalski, Luis Linhares Santos, Ana Marques, Marisa Miranda, Sonia Teixeira, Andrea Salgueiro, Filipe Pereira, Michail Ketskalo, Sergey Tsarenko, Alexandra Shilova, Ivan Afukov, Konstantin Popugaev, Sergei Minin, Daniil Shelukhin, Olga Malceva, Moroz Gleb, Alexander Skopets, Roman Kornelyuk, Alexandr Kulikov, Vadim Okhrimchuk, Alexandr Turchaninov, Maxim Petrushin, Anastasia Sheck, Akhmed Mekulov, Svetlana Ciryateva, Dmitry Urusov, Vojka Gorjup, Alenka Golicnik, Tomaz Goslar, Ricard Ferrer, Maria Martinez-Martinez, Eduard Argudo, Neiser Palmer, Raul De Pablo Sanchez, Lucas Juan Higuera, Lucas Arnau Blasco, Josè A Marquez, Fabrizio Sbraga, Mari Paz Fuset, Pablo Ruiz De Gopegui, Luis M Claraco, Josè A De Ayala, Maranta Peiro, Pilar Ricart, Sergio Martinez, Fernando Chavez, Marc Fabra, elena Sandoval, David Toapanta, Albert Carraminana, Adrian Tellez, Jeysson Ososio, Pablo Milan, Jorge Rodriguez, Garcia Andoni, Carola Gutierrez, Enrique Perez de la Sota, Andrea Eixeres-Esteve, Maria Teresa Garcia-Maellas, Judit Gutierrez-Gutierrez, Rafael Arboleda-Salazar, Patricia Santa Teresa, Alexis Jaspe, Alberto Garrido, Galo Castaneda, Sara Alcantara, Nuria Martinez, Marina Perez, Hector Villanueva, Anxela Vidal Gonzalez, Juan Paez, Arnoldo Santon, Cesar Perez, Marta Lopez, Maria Isabel Rubio Lopez, Antonio Gordillo, Jose Naranjo-Izurieta, Javier Munoz, Immaculada Alcalde, Fernando Onieva, Ricardo Gimeno Costa, Francisco Perez, Isabel Madrid, Monica Gordon, Carlos L Albacete Moreno, Daniel Perez, Nayara Lopez, Domingo Martinenz, Pablo Blanco-Schweizer, Cristina Diez, David Perez, Ana Prieto, Gloria Renedo, Elena Bustamante, Ramon Cicuendez, Rafael Citores, Victoria Boado, Katherine Garcia, Roberto Voces, Monica Domezain, Jose Maria Nunez Martinez, Raimundo Vicente, David Martin, Antonio Andreu, Vanesa Gomez Casal, Ignacio Chico, Eva Maria Menor, Sabela Vara, Jose Gamacho, Helen Perez-Chomon, Francisco Javier Gonzales, Irene Barrero, Luis Martin-Villen, Esperanza Fernandez, Maria Mendoza, Joaquin Navarro, Joaquin Colomina Climent, Alfredo Gonzales-Perez, Guillermo Muniz-Albaceita, Laura Amado, Raquel Rodriguez, Emilio Ruiz, Maria Eiras, Edgars Grins, Rosen Magnus, Mikael Kanetoft, Marcus Eidevald, Pia Watson, Paul R Vogt, Peter Steiger, Tobias Aigner, Alberto Weber, Jurg Grunefelder, Martin Kunz, Martin Grapow, Thierry Aymard, Diana Reser, Gianluca Agus, Jolanda Consiglio, Matthias Haenggi, Jenni Hansjoerg, Manuela Iten, Thomas Doeble, Urs Zenklusen, Xavier Bechtold, Giovanni Faedda, Manuel Iafrate, Amanda Rohjer, Layla Bergamaschi, Jos Maessen, Dinis Reis Miranda, H Endeman, D Gommers, C Meuwese, Jacinta Maas, MJ Van Gijlswijk, RN Van Berg, Dario Candura, Marcel Van der Linden, Merijin Kant, JJ Van der Heijden, Eric Scholten, Nicole Van Belle-van Haren, WK Lagrand, Alexander P Vlaar, Syste De Jong, Basar Cander, Murat Sargin, Murat Ugur, Mehmet A Kaygin, Kathleen Daly, Nicola Agnew, Laura Head, Laura Kelly, Gunawardena Anoma, Clare Russell, Verna Aquino, Ian Scott, Lucy Flemming, Stuart Gillon, Olivia Moore, Elton Gelandt, George Auzinger, Sameer Patel, Robert Loveridge, MUMC+: MA Cardiothoracale Chirurgie (3), CTC, RS: Carim - V04 Surgical intervention, University of Zurich, and Lorusso, Roberto

Subjects
Pulmonary and Respiratory Medicine, 2740 Pulmonary and Respiratory Medicine, 610 Medicine & health, 10023 Institute of Intensive Care Medicine
Abstract

BACKGROUND: Extracorporeal membrane oxygenation (ECMO) has been widely used in patients with COVID-19, but uncertainty remains about the determinants of in-hospital mortality and data on post-discharge outcomes are scarce. The aims of this study were to investigate the variables associated with in-hospital outcomes in patients who received ECMO during the first wave of COVID-19 and to describe the status of patients 6 months after ECMO initiation.METHODS: EuroECMO-COVID is a prospective, multicentre, observational study developed by the European Extracorporeal Life Support Organization. This study was based on data from patients aged 16 years or older who received ECMO support for refractory COVID-19 during the first wave of the pandemic-from March 1 to Sept 13, 2020-at 133 centres in 21 countries. In-hospital mortality and mortality 6 months after ECMO initiation were the primary outcomes. Mixed-Cox proportional hazards models were used to investigate associations between patient and management-related variables (eg, patient demographics, comorbidities, pre-ECMO status, and ECMO characteristics and complications) and in-hospital deaths. Survival status at 6 months was established through patient contact or institutional charts review. This study is registered with ClinicalTrials.gov, NCT04366921, and is ongoing.FINDINGS: Between March 1 and Sept 13, 2020, 1215 patients (942 [78%] men and 267 [22%] women; median age 53 years [IQR 46-60]) were included in the study. Median ECMO duration was 15 days (IQR 8-27). 602 (50%) of 1215 patients died in hospital, and 852 (74%) patients had at least one complication. Multiorgan failure was the leading cause of death (192 [36%] of 528 patients who died with available data). In mixed-Cox analyses, age of 60 years or older, use of inotropes and vasopressors before ECMO initiation, chronic renal failure, and time from intubation to ECMO initiation of 4 days or more were associated with higher in-hospital mortality. 613 patients did not die in hospital, and 547 (95%) of 577 patients for whom data were available were alive at 6 months. 102 (24%) of 431 patients had returned to full-time work at 6 months, and 57 (13%) of 428 patients had returned to part-time work. At 6 months, respiratory rehabilitation was required in 88 (17%) of 522 patients with available data, and the most common residual symptoms included dyspnoea (185 [35%] of 523 patients) and cardiac (52 [10%] of 514 patients) or neurocognitive (66 [13%] of 512 patients) symptoms.INTERPRETATION: Patient's age, timing of cannulation (FUNDING: None.

Published
2023
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5. Neurophysiological and paraspinal oximetry monitoring to detect spinal cord ischemia in patients during and after descending aortic repair: An international multicenter explorative study

Author

Gereon Schälte, Werner H. Mess, Drosos Kotelis, Angelique W.H. Hollands, Jürg Schmidli, Walther N.K.A. van Mook, Balthasar Eberle, Roman Bühlmann, Wolfgang Buhre, Geert Willem H. Schurink, Patrick W. Weerwind, Nadia A. Sutedja, Joerg C. Schefold, Paul Bergs, Michael J. Jacobs, Jolanda Consiglio, Cheryl N. Oostveen, MUMC+: MA Extra Corp Circ CTC (9), RS: Carim - V04 Surgical intervention, MUMC+: MA AIOS Neurologie (9), MUMC+: Centrum voor Acute en Kritieke Zorg (3), Anesthesiologie, MUMC+: MA Anesthesiologie (9), Vascular Surgery, MUMC+: MA Vaatchirurgie CVC (3), RS: Carim - V03 Regenerative and reconstructive medicine vascular disease, MUMC+: Hart en Vaat Centrum (3), MUMC+: *HVC European Venous Centre (9), Intensive Care, MUMC+: MA Medische Staf IC (9), RS: SHE - R1 - Research (OvO), MUMC+: HZC Klinische Neurofysiologie (5), Klinische Neurowetenschappen, MUMC+: HZC Med Staf Spec Klinische Neurofys (9), RS: Carim - B06 Imaging, and RS: MHeNs - R1 - Cognitive Neuropsychiatry and Clinical Neuroscience

Subjects
Descending aortic repair, NEAR-INFRARED SPECTROSCOPY, Context (language use), 610 Medicine & health, Article, 03 medical and health sciences, Neurophysiological monitoring techniques, 0302 clinical medicine, Medicine, 030212 general & internal medicine, Spinal cord injury, Pharmacology, lcsh:R5-920, NIRS oximetry, business.industry, Clinical study design, Thoracoabdominal aortic aneurysm repair, Spinal cord ischemia, General Medicine, Perioperative, Neurophysiology, medicine.disease, Spinal cord, medicine.anatomical_structure, Anesthesia, business, Paraplegia, lcsh:Medicine (General), 030217 neurology & neurosurgery
Abstract

Background: During descending aortic repair, critically decreased blood flow to the myelum can result in ischemic spinal cord injury and transient or permanent paraplegia. Assessment of motor evoked potentials (MEPs) has been shown to be a valuable tool which allows to detect spinal cord ischemia (SCI) intraoperatively within a therapeutic window suitable to prevent progression to paraparesis or paraplegia. MEP monitoring is not feasible during postoperative care in the awakening patient. Therefore, ancillary techniques to monitor integrity of spinal cord function are needed to detect delayed spinal cord ischemia. Objective: The purpose of this study is to evaluate whether assessment of long loop reflexes (LLR; F-waves) and paraspinal muscle oximetry using Near-Infrared Spectroscopy (NIRS) are feasible and valid in detecting delayed SCI. Methods: We aim to include patients from three tertiary referral centers undergoing aortic repair with MEP monitoring in this study.F-wave measurements and paraspinal NIRS oximetry will be operated intra- and postoperatively. Measurement characteristics and feasibility will be assessed in the first 25 patients. Subsequently, a second cohort of 75 patients will be investigated to determine the sensitivity and specificity of F-waves and NIRS in detecting perioperative SCI. In this context for the MEP group SCI is defined intraoperatively as significant MEP changes and postoperatively as newly developed paraplegia. Conclusions: A clinical study design and protocol is proposed to assess if F-waves and/or NIRS-based paraspinal oximetry are feasible and valid in detecting and monitoring for occurrences of delayed SCI. Keywords: Spinal cord ischemia, Neurophysiological monitoring techniques, NIRS oximetry, Descending aortic repair, Thoracoabdominal aortic aneurysm repair

Published
2020
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6. An in vitro lung model to assess true shunt fraction by multiple inert gas elimination

Author

Radhakrishna Rakesh Vasireddy, Balthasar Eberle, Beate Hugi-Mayr, Balamurugan Varadarajan, Andreas Vogt, Jolanda Consiglio, and Volker Hartwich

Subjects
Pathology, Critical Care and Emergency Medicine, Pulmonology, Physiology, lcsh:Medicine, Mass Spectrometry, Mathematical and Statistical Techniques, 0302 clinical medicine, Animal Cells, Red Blood Cells, Medicine and Health Sciences, 030212 general & internal medicine, lcsh:Science, 610 Medicine & health, Inert gas, Lung, Acute Respiratory Distress Syndrome, Multidisciplinary, Multiple inert gas elimination technique, Physics, Classical Mechanics, Body Fluids, Solutions, Blood, medicine.anatomical_structure, Physical Sciences, Regression Analysis, Bubbles, Shunt fraction, Anatomy, Cellular Types, Statistics (Mathematics), Shunt (electrical), Research Article, medicine.medical_specialty, Oxygenators, Materials science, Materials by Structure, Materials Science, Fluid Mechanics, In Vitro Techniques, Linear Regression Analysis, Research and Analysis Methods, Mass spectrometry, Models, Biological, Noble Gases, Continuum Mechanics, 03 medical and health sciences, Extracorporeal Membrane Oxygenation, Respiratory Failure, Ventilation-Perfusion Ratio, medicine, Humans, Statistical Methods, Fluid Flow, Blood Cells, Chromatography, Pulmonary Gas Exchange, Micropore Filters, lcsh:R, Biology and Life Sciences, Fluid Dynamics, Cell Biology, Oxygenation, 030228 respiratory system, Mixtures, lcsh:Q, Mathematics
Abstract

The Multiple Inert Gas Elimination Technique, based on Micropore Membrane Inlet Mass Spectrometry, (MMIMS-MIGET) has been designed as a rapid and direct method to assess the full range of ventilation-to-perfusion (V/Q) ratios. MMIMS-MIGET distributions have not been assessed in an experimental setup with predefined V/Q-distributions. We aimed (I) to construct a novel in vitro lung model (IVLM) for the simulation of predefined V/Q distributions with five gas exchange compartments and (II) to correlate shunt fractions derived from MMIMS-MIGET with preset reference shunt values of the IVLM. Five hollow-fiber membrane oxygenators switched in parallel within a closed extracorporeal oxygenation circuit were ventilated with sweep gas (V) and perfused with human red cell suspension or saline (Q). Inert gas solution was infused into the perfusion circuit of the gas exchange assembly. Sweep gas flow (V) was kept constant and reference shunt fractions (IVLM-S) were established by bypassing one or more oxygenators with perfusate flow (Q). The derived shunt fractions (MM-S) were determined using MIGET by MMIMS from the retention data. Shunt derived by MMIMS-MIGET correlated well with preset reference shunt fractions. The in vitro lung model is a convenient system for the setup of predefined true shunt fractions in validation of MMIMS-MIGET.

Published
2017
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7. Multi frequency phase fluorimetry (MFPF) for oxygen partial pressure measurement: ex vivo validation by polarographic clark-type electrode

Author

James E. Baumgardner, Jolanda Consiglio, Andreas Vogt, Klaus Markstaller, Reto Basciani, Bastian Duenges, Beate Mayr, Klaus Ulrich Klein, Stefan Boehme, and Volker Hartwich

Subjects
Drugs and Devices, Anatomy and Physiology, Materials science, Swine, Partial Pressure, Phase (waves), Analytical chemistry, chemistry.chemical_element, lcsh:Medicine, 610 Medicine & health, Bioengineering, Cardiovascular, Cardiovascular System, Oxygen, Fluorescence spectroscopy, Medical Devices, 03 medical and health sciences, Engineering, 0302 clinical medicine, Anesthesiology, Diagnostic Medicine, Animals, Fluorometry, ddc:610, 030212 general & internal medicine, lcsh:Science, Biology, Blood gas analysis, Polarography, Chemical Physics, Anesthesiology Technology, Multidisciplinary, Physics, lcsh:R, Partial pressure, Models, Theoretical, Chemistry, chemistry, Electrode, Medicine, High temporal resolution, lcsh:Q, Blood Gas Analysis, 030217 neurology & neurosurgery, Research Article
Abstract

BACKGROUND: Measurement of partial pressure of oxygen (PO2) at high temporal resolution remains a technological challenge. This study introduces a novel PO2 sensing technology based on Multi-Frequency Phase Fluorimetry (MFPF). The aim was to validate MFPF against polarographic Clark-type electrode (CTE) PO2 measurements. METHODOLOGY/PRINCIPAL FINDINGS: MFPF technology was first investigated in N = 8 anaesthetised pigs at FIO2 of 0.21, 0.4, 0.6, 0.8 and 1.0. At each FIO2 level, blood samples were withdrawn and PO2 was measured in vitro with MFPF using two FOXY-AL300 probes immediately followed by CTE measurement. Secondly, MFPF-PO2 readings were compared to CTE in an artificial circulatory setup (human packed red blood cells, haematocrit of 30%). The impacts of temperature (20, 30, 40°C) and blood flow (0.8, 1.6, 2.4, 3.2, 4.0 L min(-1)) on MFPF-PO2 measurements were assessed. MFPF response time in the gas- and blood-phase was determined. Porcine MFPF-PO2 ranged from 63 to 749 mmHg; the corresponding CTE samples from 43 to 712 mmHg. Linear regression: CTE = 15.59+1.18*MFPF (R(2) = 0.93; P0.05). MFPF response-time (monoexponential) was 1.48±0.26 s for the gas-phase and 1.51±0.20 s for the blood-phase. CONCLUSIONS/SIGNIFICANCE: MFPF-derived PO2 readings were reproducible and showed excellent correlation and good agreement with Clark-type electrode-based PO2 measurements. There was no relevant impact of temperature and blood flow upon MFPF-PO2 measurements. The response time of the MFPF FOXY-AL300 probe was adequate for real-time sensing in the blood phase.

Published
2013
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