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Šegrt Ribičić I, Valić M, Lušić Kalcina L, Božić J, Obad A, Glavaš D, Glavičić I, Valić Z. Effects of Oxygen Prebreathing on Bubble Formation, Flow-Mediated Dilatation, and Psychomotor Performance during Trimix Dives. Sports (Basel) 2024; 12:35. [PMID: 38275984 PMCID: PMC10820603 DOI: 10.3390/sports12010035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/16/2024] [Accepted: 01/19/2024] [Indexed: 01/27/2024] Open
Abstract
Introduction: This research was performed to examine the effects of air and oxygen prebreathing on bubble formation, flow-mediated dilatation, and psychomotor performance after scuba dives. Methods: Twelve scuba divers performed two dives using a gas mixture of oxygen, nitrogen, and helium (trimix). In a randomized protocol, they breathed air or oxygen 30 min before the trimix dives. Venous bubble formation, flow-mediated dilatation, and psychomotor performance were evaluated. The participants solved three psychomotor tests: determining the position of a light signal, coordination of complex psychomotor activity, and simple arithmetic operations. The total test solving time, minimum single-task solving time, and median solving time were analyzed. Results: The bubble grade was decreased in the oxygen prebreathing protocol in comparison to the air prebreathing protocol (1.5 vs. 2, p < 0.001). The total test solving times after the dives, in tests of complex psychomotor coordination and simple arithmetic operations, were shorter in the oxygen prebreathing protocol (25 (21-28) vs. 31 (26-35) and 87 (82-108) vs. 106 (90-122) s, p = 0.028). Conclusions: In the oxygen prebreathing protocol, the bubble grade was significantly reduced with no change in flow-mediated dilatation after the dives, indicating a beneficial role for endothelial function. The post-dive psychomotor speed was faster in the oxygen prebreathing protocol.
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Affiliation(s)
- Ivana Šegrt Ribičić
- Department of Pulmonary Diseases, University Hospital Center Split, 21000 Split, Croatia;
| | - Maja Valić
- Department of Neuroscience, University of Split School of Medicine, 21000 Split, Croatia;
| | - Linda Lušić Kalcina
- Department of Neuroscience, University of Split School of Medicine, 21000 Split, Croatia;
| | - Joško Božić
- Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia;
| | - Ante Obad
- Department of Health Studies, University of Split, 21000 Split, Croatia;
| | - Duška Glavaš
- Department of Internal Medicine, University of Split School of Medicine, 21000 Split, Croatia;
| | - Igor Glavičić
- Department of Marine Studies, University of Split, 21000 Split, Croatia;
| | - Zoran Valić
- Department of Physiology, University of Split School of Medicine, 21000 Split, Croatia;
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Šegrt Ribičić I, Valić M, Božić J, Obad A, Glavaš D, Glavičić I, Valić Z. Influence of oxygen enriched gases during decompression on bubble formation and endothelial function in self-contained underwater breathing apparatus diving: a randomized controlled study. Croat Med J 2019. [PMID: 31187955 PMCID: PMC6563167 DOI: 10.3325/cmj.2019.60.265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Aim To assess the effect of air, gas mixture composed of 50% nitrogen and 50% oxygen (nitrox 50), or gas mixture composed of 1% nitrogen and 99% oxygen (nitrox 99) on bubble formation and vascular/endothelial function during decompression after self-contained underwater breathing apparatus diving. Methods This randomized controlled study, conducted in 2014, involved ten divers. Each diver performed three dives in a randomized protocol using three gases: air, nitrox 50, or nitrox 99 during ascent. The dives were performed on three different days limited to 45 m sea water (msw) depth with 20 min bottom time. Nitrogen bubbles formation was assessed by ultrasound detection after dive. Arterial/endothelial function was evaluated by brachial artery flow mediated dilatation (FMD) before and after dive. Results Nitrox 99 significantly reduced bubble formation after cough compared with air and nitrox 50 (grade 1 vs 3 and vs 3, respectively, P = 0.026). Nitrox 50 significantly decreased post-dive FMD compared with pre-dive FMD (3.62 ± 5.57% vs 12.11 ± 6.82% P = 0.010), while nitrox 99 did not cause any significant change. Conclusion Nitrox 99 reduced bubble formation, did not change post-dive FMD, and decreased total dive duration, indicating that it might better preserve endothelial function compared with air and nitrox 50 dive protocols.
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Affiliation(s)
| | - Maja Valić
- Maja Valić, Department of Neuroscience, University of Split School of Medicine, Soltanska 2, 21000 Split, Croatia,
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Imbert JP, Egi SM, Germonpré P, Balestra C. Static Metabolic Bubbles as Precursors of Vascular Gas Emboli During Divers' Decompression: A Hypothesis Explaining Bubbling Variability. Front Physiol 2019; 10:807. [PMID: 31354506 PMCID: PMC6638188 DOI: 10.3389/fphys.2019.00807] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 06/06/2019] [Indexed: 12/15/2022] Open
Abstract
Introduction The risk for decompression sickness (DCS) after hyperbaric exposures (such as SCUBA diving) has been linked to the presence and quantity of vascular gas emboli (VGE) after surfacing from the dive. These VGE can be semi-quantified by ultrasound Doppler and quantified via precordial echocardiography. However, for an identical dive, VGE monitoring of divers shows variations related to individual susceptibility, and, for a same diver, dive-to-dive variations which may be influenced by pre-dive pre-conditioning. These variations are not explained by currently used algorithms. In this paper, we present a new hypothesis: individual metabolic processes, through the oxygen window (OW) or Inherent Unsaturation of tissues, modulate the presence and volume of static metabolic bubbles (SMB) that in turn act as precursors of circulating VGE after a dive. Methods We derive a coherent system of assumptions to describe static gas bubbles, located on the vessel endothelium at hydrophobic sites, that would be activated during decompression and become the source of VGE. We first refer to the OW and show that it creates a local tissue unsaturation that can generate and stabilize static gas phases in the diver at the surface. We then use Non-extensive thermodynamics to derive an equilibrium equation that avoids any geometrical description. The final equation links the SMB volume directly to the metabolism. Results and Discussion Our model introduces a stable population of small gas pockets of an intermediate size between the nanobubbles nucleating on the active sites and the VGE detected in the venous blood. The resulting equation, when checked against our own previously published data and the relevant scientific literature, supports both individual variation and the induced differences observed in pre-conditioning experiments. It also explains the variability in VGE counts based on age, fitness, type and frequency of physical activities. Finally, it fits into the general scheme of the arterial bubble assumption for the description of the DCS risk. Conclusion Metabolism characterization of the pre-dive SMB population opens new possibilities for decompression algorithms by considering the diver's individual susceptibility and recent history (life style, exercise) to predict the level of VGE during and after decompression.
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Affiliation(s)
| | - Salih Murat Egi
- Department of Computer Engineering, Galatasaray University, Istanbul, Turkey.,DAN Europe Research Division, Divers Alert Network (DAN), Roseto, Italy
| | - Peter Germonpré
- DAN Europe Research Division, Divers Alert Network (DAN), Roseto, Italy.,Centre for Hyperbaric Oxygen Therapy, Military Hospital Brussels, Brussels, Belgium
| | - Costantino Balestra
- DAN Europe Research Division, Divers Alert Network (DAN), Roseto, Italy.,Environmental, Occupational and Ageing Physiology Laboratory, Haute Ecole Bruxelles-Brabant (HE2B), Brussels, Belgium
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Brebeck AK, Deussen A, Range U, Balestra C, Cleveland S, Schipke JD. Beneficial effect of enriched air nitrox on bubble formation during scuba diving. An open-water study. J Sports Sci 2017; 36:605-612. [DOI: 10.1080/02640414.2017.1326617] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Anne-Kathrin Brebeck
- Institute of Physiology, Medical Faculty Carl Gustav Carus of TU, Dresden, Germany
| | - Andreas Deussen
- Institute of Physiology, Medical Faculty Carl Gustav Carus of TU, Dresden, Germany
| | - Ursula Range
- Institute of Medical Informatics and Biometrics, Medical Faculty Carl Gustav Carus of TU, Dresden, Germany
| | - Costantino Balestra
- Environmental & Occupational Physiology Laboratory, Haute Ecole Henri Spaak, Brussels, BE, Auderghem, Belgium
| | - Sinclair Cleveland
- Institute of Neuro- and Sensory Physiology, Heinrich Heine Universität Düsseldorf, Düsseldorf, Germany
| | - Jochen D. Schipke
- Research Group Experimental Surgery, University Hospital Düsseldorf, Düsseldorf, Germany
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Souday V, Koning NJ, Perez B, Grelon F, Mercat A, Boer C, Seegers V, Radermacher P, Asfar P. Enriched Air Nitrox Breathing Reduces Venous Gas Bubbles after Simulated SCUBA Diving: A Double-Blind Cross-Over Randomized Trial. PLoS One 2016; 11:e0154761. [PMID: 27163253 PMCID: PMC4862661 DOI: 10.1371/journal.pone.0154761] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 04/19/2016] [Indexed: 11/21/2022] Open
Abstract
Objective To test the hypothesis whether enriched air nitrox (EAN) breathing during simulated diving reduces decompression stress when compared to compressed air breathing as assessed by intravascular bubble formation after decompression. Methods Human volunteers underwent a first simulated dive breathing compressed air to include subjects prone to post-decompression venous gas bubbling. Twelve subjects prone to bubbling underwent a double-blind, randomized, cross-over trial including one simulated dive breathing compressed air, and one dive breathing EAN (36% O2) in a hyperbaric chamber, with identical diving profiles (28 msw for 55 minutes). Intravascular bubble formation was assessed after decompression using pulmonary artery pulsed Doppler. Results Twelve subjects showing high bubble production were included for the cross-over trial, and all completed the experimental protocol. In the randomized protocol, EAN significantly reduced the bubble score at all time points (cumulative bubble scores: 1 [0–3.5] vs. 8 [4.5–10]; P < 0.001). Three decompression incidents, all presenting as cutaneous itching, occurred in the air versus zero in the EAN group (P = 0.217). Weak correlations were observed between bubble scores and age or body mass index, respectively. Conclusion EAN breathing markedly reduces venous gas bubble emboli after decompression in volunteers selected for susceptibility for intravascular bubble formation. When using similar diving profiles and avoiding oxygen toxicity limits, EAN increases safety of diving as compared to compressed air breathing. Trial Registration ISRCTN 31681480
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Affiliation(s)
- Vincent Souday
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
| | - Nick J. Koning
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
- INSERM U1083, CNRS UMR 6214, University Hospital, Angers, France
- Department of Anesthesiology. Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands
| | - Bruno Perez
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
| | - Fabien Grelon
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
| | - Alain Mercat
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
| | - Christa Boer
- Department of Anesthesiology. Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands
| | - Valérie Seegers
- Interactions Cellulaires et Applications Thérapeutique and DRCI Data management, SFR du pôle Santé; University Hospital, Angers, France
| | - Peter Radermacher
- Institut für Anästhesiologische Pathophysiologie und Verfahrensentwicklung, Universitätsklinikum Ulm, Ulm, Germany
| | - Pierre Asfar
- Department of Medical Intensive Care and Hyperbaric Medicine, University Hospital, Angers, France
- INSERM U1083, CNRS UMR 6214, University Hospital, Angers, France
- * E-mail:
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Papadopoulou V, Evgenidis S, Eckersley RJ, Mesimeris T, Balestra C, Kostoglou M, Tang MX, Karapantsios TD. Decompression induced bubble dynamics on ex vivo fat and muscle tissue surfaces with a new experimental set up. Colloids Surf B Biointerfaces 2015; 129:121-9. [PMID: 25835147 DOI: 10.1016/j.colsurfb.2015.03.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 02/17/2015] [Accepted: 03/10/2015] [Indexed: 10/23/2022]
Abstract
Vascular gas bubbles are routinely observed after scuba dives using ultrasound imaging, however the precise formation mechanism and site of these bubbles are still debated and growth from decompression in vivo has not been extensively studied, due in part to imaging difficulties. An experimental set-up was developed for optical recording of bubble growth and density on tissue surface area during hyperbaric decompression. Muscle and fat tissues (rabbits, ex vivo) were covered with nitrogen saturated distilled water and decompression experiments performed, from 3 to 0bar, at a rate of 1bar/min. Pictures were automatically acquired every 5s from the start of the decompression for 1h with a resolution of 1.75μm. A custom MatLab analysis code implementing a circular Hough transform was written and shown to be able to track bubble growth sequences including bubble center, radius, contact line and contact angles over time. Bubble density, nucleation threshold and detachment size, as well as coalescence behavior, were shown significantly different for muscle and fat tissues surfaces, whereas growth rates after a critical size were governed by diffusion as expected. Heterogeneous nucleation was observed from preferential sites on the tissue substrate, where the bubbles grow, detach and new bubbles form in turn. No new nucleation sites were observed after the first 10min post decompression start so bubble density did not vary after this point in the experiment. In addition, a competition for dissolved gas between adjacent multiple bubbles was demonstrated in increased delay times as well as slower growth rates for non-isolated bubbles.
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Affiliation(s)
- Virginie Papadopoulou
- Department of Bioengineering, Imperial College London, London, UK; Environmental & Occupational Physiology Lab., Haute Ecole Paul Henri Spaak, Brussels, Belgium.
| | - Sotiris Evgenidis
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Robert J Eckersley
- Imaging Sciences & Biomedical Engineering Division, King's College London, London, UK
| | - Thodoris Mesimeris
- Hyperbaric Department, St. Paul General Hospital of Thessaloniki, Thessaloniki, Greece
| | - Costantino Balestra
- Environmental & Occupational Physiology Lab., Haute Ecole Paul Henri Spaak, Brussels, Belgium; DAN Europe Research Division, Belgium
| | - Margaritis Kostoglou
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Meng-Xing Tang
- Department of Bioengineering, Imperial College London, London, UK
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Blatteau JE, Hugon J, Castagna O, Meckler C, Vallée N, Jammes Y, Hugon M, Risberg J, Pény C. Submarine rescue decompression procedure from hyperbaric exposures up to 6 bar of absolute pressure in man: effects on bubble formation and pulmonary function. PLoS One 2013; 8:e67681. [PMID: 23844058 PMCID: PMC3699632 DOI: 10.1371/journal.pone.0067681] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 05/20/2013] [Indexed: 11/19/2022] Open
Abstract
Recent advances in submarine rescue systems have allowed a transfer under pressure of crew members being rescued from a disabled submarine. The choice of a safe decompression procedure for pressurised rescuees has been previously discussed, but no schedule has been validated when the internal submarine pressure is significantly increased i.e. exceeding 2.8 bar absolute pressure. This study tested a saturation decompression procedure from hyperbaric exposures up to 6 bar, the maximum operating pressure of the NATO submarine rescue system. The objective was to investigate the incidence of decompression sickness (DCS) and clinical and spirometric indices of pulmonary oxygen toxicity. Two groups were exposed to a Nitrogen-Oxygen atmosphere (pO2 = 0.5 bar) at either 5 bar (N = 14) or 6 bar (N = 12) for 12 h followed by 56 h 40 min resp. 60 h of decompression. When chamber pressure reached 2.5 bar, the subjects breathed oxygen intermittently, otherwise compressed air. Repeated clinical examinations, ultrasound monitoring of venous gas embolism and spirometry were performed during decompression. During exposures to 5 bar, 3 subjects had minor subjective symptoms i.e. sensation of joint discomfort, regressing spontaneously, and after surfacing 2 subjects also experienced joint discomfort disappearing without treatment. Only 3 subjects had detectable intravascular bubbles during decompression (low grades). No bubbles were detected after surfacing. About 40% of subjects felt chest tightness when inspiring deeply during the initial phase of decompression. Precordial burning sensations were reported during oxygen periods. During decompression, vital capacity decreased by about 8% and forced expiratory flow rates decreased significantly. After surfacing, changes in the peripheral airways were still noticed; Lung Diffusion for carbon monoxide was slightly reduced by 1% while vital capacity was normalized. The procedure did not result in serious symptoms of DCS or pulmonary oxygen toxicity and may be considered for use when the internal submarine pressure is significantly increased.
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Affiliation(s)
- Jean-Eric Blatteau
- Equipe Résidante de Recherche Subaquatique Opérationnelle (ERRSO), Institut de Recherche Biomédicale des armées (IRBA), Toulon, France.
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