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Ruemmler R, Ziebart A, Britten E, Gosling M, Rissel R, Hartmann EK. Intrabronchial application of extracellular histones shows no proinflammatory effects in swine in a translational pilot study. BMC Res Notes 2021; 14:285. [PMID: 34301315 PMCID: PMC8306385 DOI: 10.1186/s13104-021-05704-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 07/19/2021] [Indexed: 12/02/2022] Open
Abstract
Objective Extracellular histones have been identified as one molecular factor that can cause and sustain alveolar damage and were linked to high mortality rates in critically ill patients. In this pilot study, we wanted to validate the proinflammatory in vivo effects of local histone application in a prospective translational porcine model. This was combined with the evaluation of an experimental acute lung injury model using intrabronchial lipopolysaccharides, which has been published previously. Results The targeted application of histones was successful in all animals. Animals showed decreased oxygenation after instillation, but no differences could be detected between the sham and histone treatments. The histologic analyses and inflammatory responses indicated that there were no differences in tissue damage between the groups. Supplementary Information The online version contains supplementary material available at 10.1186/s13104-021-05704-7.
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Affiliation(s)
- Robert Ruemmler
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany.
| | - Alexander Ziebart
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Elisabeth Britten
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Moritz Gosling
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Rene Rissel
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Erik K Hartmann
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, Germany
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Ruemmler R, Ziebart A, Kuropka F, Duenges B, Kamuf J, Garcia-Bardon A, Hartmann EK. Bi-Level ventilation decreases pulmonary shunt and modulates neuroinflammation in a cardiopulmonary resuscitation model. PeerJ 2020; 8:e9072. [PMID: 32377456 PMCID: PMC7195831 DOI: 10.7717/peerj.9072] [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: 12/06/2019] [Accepted: 04/06/2020] [Indexed: 11/23/2022] Open
Abstract
Background Optimal ventilation strategies during cardiopulmonary resuscitation are still heavily debated and poorly understood. So far, no convincing evidence could be presented in favour of outcome relevance and necessity of specific ventilation patterns. In recent years, alternative models to the guideline-based intermittent positive pressure ventilation (IPPV) have been proposed. In this randomized controlled trial, we evaluated a bi-level ventilation approach in a porcine model to assess possible physiological advantages for the pulmonary system as well as resulting changes in neuroinflammation compared to standard measures. Methods Sixteen male German landrace pigs were anesthetized and instrumented with arterial and venous catheters. Ventricular fibrillation was induced and the animals were left untreated and without ventilation for 4 minutes. After randomization, the animals were assigned to either the guideline-based group (IPPV, tidal volume 8–10 ml/kg, respiratory rate 10/min, FiO21.0) or the bi-level group (inspiratory pressure levels 15–17 cmH2O/5cmH2O, respiratory rate 10/min, FiO21.0). Mechanical chest compressions and interventional ventilation were initiated and after 5 minutes, blood samples, including ventilation/perfusion measurements via multiple inert gas elimination technique, were taken. After 8 minutes, advanced life support including adrenaline administration and defibrillations were started for up to 4 cycles. Animals achieving ROSC were monitored for 6 hours and lungs and brain tissue were harvested for further analyses. Results Five of the IPPV and four of the bi-level animals achieved ROSC. While there were no significant differences in gas exchange or hemodynamic values, bi-level treated animals showed less pulmonary shunt directly after ROSC and a tendency to lower inspiratory pressures during CPR. Additionally, cytokine expression of tumour necrosis factor alpha was significantly reduced in hippocampal tissue compared to IPPV animals. Conclusion Bi-level ventilation with a constant positive end expiratory pressure and pressure-controlled ventilation is not inferior in terms of oxygenation and decarboxylation when compared to guideline-based IPPV ventilation. Additionally, bi-level ventilation showed signs for a potentially ameliorated neurological outcome as well as less pulmonary shunt following experimental resuscitation. Given the restrictions of the animal model, these advantages should be further examined.
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Affiliation(s)
- Robert Ruemmler
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Alexander Ziebart
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Frances Kuropka
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Bastian Duenges
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Jens Kamuf
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Andreas Garcia-Bardon
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
| | - Erik K Hartmann
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg University, Mainz, Germany
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Hardjo S, Croton C, Haworth MD. A pilot study evaluating the utility of a novel tube cricothyrotomy technique in providing ventilation in small animals using a live porcine model. VETERINARY MEDICINE-RESEARCH AND REPORTS 2019; 10:111-121. [PMID: 31934552 PMCID: PMC6711556 DOI: 10.2147/vmrr.s216551] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 08/01/2019] [Indexed: 12/29/2022]
Abstract
Background Tube cricothyrotomy has been suggested as a first-choice for emergency surgical airway access in small animals, rather than the more commonly accepted procedures of tracheotomy and needle cricothyrotomy. Methods A small pilot study of tube cricothyrotomy in a live porcine model was conducted to evaluate this method. The technique was modified to permit the use of commonly available equipment and ease of application. Following ethics approval, a tube cricothyrotomy was performed on 9 live pigs. The endpoints were the efficacy of ventilation through the tube as measured by end-tidal carbon dioxide, successful placement of the tube and the time taken for placement. Results Of the nine pigs, eight had a tube placed successfully, with the median procedure time being 111.5 seconds (range: 35–240 seconds). After 10 mins, the mean end-tidal carbon dioxide was 58.3 mmHg (95% CI: 55.2–61.3 mmHg), with a range of 54–64 mmHg. Tube cricothyrotomy holds promise as a means of rapidly obtaining tracheal access in small animals and temporarily sustaining ventilation in an emergency. Conclusion Further detailed investigation is warranted to assess the use of this technique in the small animal emergency setting.
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Affiliation(s)
- Sureiyan Hardjo
- School of Veterinary Science, The University of Queensland, Gatton 4343, Queensland, Australia
| | - Catriona Croton
- School of Veterinary Science, The University of Queensland, Gatton 4343, Queensland, Australia
| | - Mark D Haworth
- School of Veterinary Science, The University of Queensland, Gatton 4343, Queensland, Australia
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Ziebart A, Schaefer MM, Thomas R, Kamuf J, Garcia-Bardon A, Möllmann C, Ruemmler R, Heid F, Schad A, Hartmann EK. Random allogeneic blood transfusion in pigs: characterisation of a novel experimental model. PeerJ 2019; 7:e7439. [PMID: 31440432 PMCID: PMC6699485 DOI: 10.7717/peerj.7439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 07/08/2019] [Indexed: 12/29/2022] Open
Abstract
Background Organ cross-talk describes interactions between a primary affected organ and a secondarily injured remote organ, particularly in lung-brain interactions. A common theory is the systemic distribution of inflammatory mediators that are released by the affected organ and transferred through the bloodstream. The present study characterises the baseline immunogenic effects of a novel experimental model of random allogeneic blood transfusion in pigs designed to analyse the role of the bloodstream in organ cross-talk. Methods After approval of the State and Institutional Animal Care Committee, 20 anesthetized pig were randomized in a donor and an acceptor (each n = 8): the acceptor animals each received high-volume whole blood transfusion from the donor (35–40 ml kg−1). Four animals received balanced electrolyte solution instead of blood transfusion (control group; n = 4). Afterwards the animals underwent extended cardiorespiratory monitoring for eight hours. Post mortem assessment included pulmonary, cerebral and systemic mediators of early inflammatory response (IL-6, TNF-alpha, iNOS), wet to dry ratio, and lung histology. Results No adverse events or incompatibilities occurred during the blood transfusion procedures. Systemic cytokine levels and pulmonary function were unaffected. Lung histopathology scoring did not display relevant intergroup differences. Neither within the lung nor within the brain an up-regulation of inflammatory mediators was detected. High volume random allogeneic blood transfusion in pigs neither impaired pulmonary integrity nor induced systemic, lung, or brain inflammatory response. Conclusion This approach can represent a novel experimental model to characterize the blood-bound transmission in remote organ injury.
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Affiliation(s)
- Alexander Ziebart
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Moritz M Schaefer
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Rainer Thomas
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Jens Kamuf
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Andreas Garcia-Bardon
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Christian Möllmann
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Robert Ruemmler
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Florian Heid
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Arno Schad
- Institute of Pathology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
| | - Erik K Hartmann
- Department of Anesthesiology, Medical Centre of the Johannes Gutenberg-University, Mainz, Germany
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Ruemmler R, Ziebart A, Moellmann C, Garcia-Bardon A, Kamuf J, Kuropka F, Duenges B, Hartmann EK. Ultra-low tidal volume ventilation-A novel and effective ventilation strategy during experimental cardiopulmonary resuscitation. Resuscitation 2018; 132:56-62. [PMID: 30176273 DOI: 10.1016/j.resuscitation.2018.08.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 08/05/2018] [Accepted: 08/28/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND The effects of different ventilation strategies during CPR on patient outcomes and lung physiology are still poorly understood. This study compares positive pressure ventilation (IPPV) to passive oxygenation (CPAP) and a novel ultra-low tidal volume ventilation (ULTVV) regimen in an experimental ventricular fibrillation animal model. STUDY DESIGN Prospective randomized controlled trial. ANIMALS 30 male German landrace pigs (16-20 weeks). METHODS Ventricular fibrillation was induced in anesthetized and instrumented pigs and the animals were randomized into three groups. Mechanical CPR was initiated and ventilation was either provided by means of standard IPPV (RR: 10/min, Vt: 8-9 ml/kg, FiO2: 1,0, PEEP: 5 mbar), CPAP (O2-Flow: 10 l/min, PEEP: 5 mbar) or ULTVV (RR: 50/min, Vt: 2-3 ml/kg, FiO2: 1,0, PEEP: 5 mbar). Guideline-based advanced life support was applied for a maximum of 4 cycles and animals achieving ROSC were monitored for 6 h before terminating the experiment. Ventilation/perfusion ratios were performed via multiple inert gas elimination, blood gas analyses were taken hourly and extended cardiovascular measurements were collected constantly. Brain and lung tissue samples were taken and analysed for proinflammatory cytokine expression. RESULTS ULTVV provided sufficient oxygenation and ventilation during CPR while demanding significantly lower respiratory and intrathoracic pressures. V/Q mismatch was significantly decreased and lung injury was mitigated in surviving animals compared to IPPV and CPAP. Additionally, cerebral cytokine expression was dramatically reduced. CONCLUSION Ultra-low-volume ventilation during CPR in a porcine model is feasible and may provide lung-protective benefits as well as neurological outcome improvement due to lower inflammation. Our results warrant further studies and might eventually lead to new therapeutic options in the resuscitation setting.
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Affiliation(s)
- Robert Ruemmler
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany.
| | - Alexander Ziebart
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Christian Moellmann
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Andreas Garcia-Bardon
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Jens Kamuf
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Frances Kuropka
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Bastian Duenges
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
| | - Erik Kristoffer Hartmann
- Department of Anesthesiology, Medical Center of the Johannes Gutenberg-University, Langebeckstrasse 1, 55116 Mainz, Germany
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Affiliation(s)
- M de Wolf
- Department of Anesthesiology and Pain Therapy, Maastricht University Medical Center, PO Box 5800, 6202 AZ, Maastricht, Niederlande.
| | - R Gottschall
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Jena, Am Klinikum 1, 07747, Jena, Deutschland
| | - D Enk
- Department of Anesthesiology and Pain Therapy, Maastricht University Medical Center, PO Box 5800, 6202 AZ, Maastricht, Niederlande
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