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Coeckelenbergh S, Entzeroth M, Van der Linden P, Flick M, Soucy-Proulx M, Alexander B, Rinehart J, Grogan T, Cannesson M, Vincent JL, Vicaut E, Duranteau J, Joosten A. Assisted Fluid Management and Sublingual Microvascular Flow During High-Risk Abdominal Surgery: A Randomized Controlled Trial. Anesth Analg 2024:00000539-990000000-00902. [PMID: 39116013 DOI: 10.1213/ane.0000000000007097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
BACKGROUND Implementation of goal-directed fluid therapy (GDFT) protocols remains low. Protocol compliance among anesthesiologists tends to be suboptimal owing to the high workload and the attention required for implementation. The assisted fluid management (AFM) system is a novel decision support tool designed to help clinicians apply GDFT protocols. This system predicts fluid responsiveness better than anesthesia practitioners do and achieves higher stroke volume (SV) and cardiac index values during surgery. We tested the hypothesis that an AFM-guided GDFT strategy would also be associated with better sublingual microvascular flow compared to a standard GDFT strategy. METHODS This bicenter, parallel, 2-arm, prospective, randomized controlled, patient and assessor-blinded, superiority study considered for inclusion all consecutive patients undergoing high-risk abdominal surgery who required an arterial catheter and uncalibrated SV monitoring. Patients having standard GDFT received manual titration of fluid challenges to optimize SV while patients having an AFM-guided GDFT strategy received fluid challenges based on recommendations from the AFM software. In all patients, fluid challenges were standardized and titrated per 250 mL and vasopressors were administered to maintain a mean arterial pressure >70 mm Hg. The primary outcome (average of each patient's intraoperative microvascular flow index (MFI) across 4 intraoperative time points) was analyzed using a Mann-Whitney U test and the treatment effect was estimated with a median difference between groups with a 95% confidence interval estimated using the bootstrap percentile method (with 1000 replications). Secondary outcomes included SV, cardiac index, total amount of fluid, other microcirculatory variables, and postoperative lactate. RESULTS A total of 86 patients were enrolled over a 7-month period. The primary outcome was significantly higher in patients with AFM (median [Q1-Q3]: 2.89 [2.84-2.94]) versus those having standard GDFT (2.59 [2.38-2.78] points, median difference 0.30; 95% confidence interval [CI], 0.19-0.49; P < .001). Cardiac index and SVI were higher (3.2 ± 0.5 vs 2.7 ± 0.7 l.min-1.m-2; P = .001 and 42 [35-47] vs 36 [32-43] mL.m-2; P = .018) and arterial lactate concentration was lower at the end of the surgery in patients having AFM-guided GDFT (2.1 [1.5-3.1] vs 2.9 [2.1-3.9] mmol.L-1; P = .026) than patients having standard GDFT strategy. Patients having AFM received a higher fluid volume but 3 times less norepinephrine than those receiving standard GDFT (P < .001). CONCLUSIONS Use of an AFM-guided GDFT strategy resulted in higher sublingual microvascular flow during surgery compared to use of a standard GDFT strategy. Future trials are necessary to make conclusive recommendations that will change clinical practice.
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Affiliation(s)
- Sean Coeckelenbergh
- From the Department of Anaesthesiology and Intensive Care, Hôpitaux Universitaires Paris-Saclay, Université Paris-Saclay, Hôpital Paul-Brousse, Assistance Publique Hôpitaux de Paris (AP-HP), Villejuif, France
- Outcomes Research Consortium, Cleveland, Ohio
| | - Marguerite Entzeroth
- From the Department of Anaesthesiology and Intensive Care, Hôpitaux Universitaires Paris-Saclay, Université Paris-Saclay, Hôpital Paul-Brousse, Assistance Publique Hôpitaux de Paris (AP-HP), Villejuif, France
| | | | - Moritz Flick
- Department of Anaesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Maxim Soucy-Proulx
- From the Department of Anaesthesiology and Intensive Care, Hôpitaux Universitaires Paris-Saclay, Université Paris-Saclay, Hôpital Paul-Brousse, Assistance Publique Hôpitaux de Paris (AP-HP), Villejuif, France
| | - Brenton Alexander
- Department of Anaesthesiology & Perioperative Care, University of California San Diego, La Jolla, California
| | - Joseph Rinehart
- Department of Anaesthesiology & Perioperative Care, University of California Irvine, California, Irvine, California
| | - Tristan Grogan
- Department of Medicine Statistics Core, David Geffen School of Medicine, University of California Los Angeles, California, Los Angeles, California
| | - Maxime Cannesson
- Department of Anaesthesiology & Perioperative Medicine, David Geffen School of Medicine, University of California Los Angeles, California, Los Angeles, California
| | - Jean-Louis Vincent
- Department of Intensive Care, Erasme Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Eric Vicaut
- Unité de Recherche Clinique, Lariboisière University Hospital, Paris 7 Diderot University, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Jacques Duranteau
- From the Department of Anaesthesiology and Intensive Care, Hôpitaux Universitaires Paris-Saclay, Université Paris-Saclay, Hôpital Paul-Brousse, Assistance Publique Hôpitaux de Paris (AP-HP), Villejuif, France
| | - Alexandre Joosten
- Department of Anaesthesiology & Perioperative Medicine, David Geffen School of Medicine, University of California Los Angeles, California, Los Angeles, California
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2
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Katunaric B, SenthilKumar G, Stehula FJ, Werthman A, Bordas-Murphy H, Freed JK. Noninvasive assessment of human microvascular function in health and disease using incident dark-field microscopy. Am J Physiol Heart Circ Physiol 2024; 327:H261-H267. [PMID: 38787388 DOI: 10.1152/ajpheart.00292.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 05/22/2024] [Accepted: 05/22/2024] [Indexed: 05/25/2024]
Abstract
Reduced peripheral microvascular reactivity is associated with an increased risk for major adverse cardiac events (MACEs). Tools for noninvasive assessment of peripheral microvascular function are limited, and existing technology is poorly validated in both healthy populations and patients with cardiovascular disease (CVD). Here, we used a handheld incident dark-field imaging tool (CytoCam) to test the hypothesis that, compared with healthy individuals (no risk factors for CVD), subjects formally diagnosed with coronary artery disease (CAD) or those with ≥2 risk factors for CAD (at risk) would exhibit impaired peripheral microvascular reactivity. A total of 17 participants (11 healthy, 6 at risk) were included in this pilot study. CytoCam was used to measure sublingual microvascular total vessel density (TVD), perfused vessel density (PVD), and microvascular flow index (MFI) in response to the topical application of acetylcholine (ACh) and sublingual administration of nitroglycerin (NTG). Baseline MFI and PVD were significantly reduced in the at-risk cohort compared with healthy individuals. Surprisingly, following the application of acetylcholine and nitroglycerin, both groups showed a significant improvement in all three microvascular perfusion parameters. These results suggest that, despite baseline reductions in both microvascular density and perfusion, human in vivo peripheral microvascular reactivity to both endothelial-dependent and -independent vasoactive agents remains intact in individuals with CAD or multiple risk factors for disease.NEW & NOTEWORTHY To our knowledge, this is the first study to comprehensively characterize in vivo sublingual microvascular structure and function (endothelium-dependent and -independent) in healthy patients and those with CVD. Importantly, we used an easy-to-use handheld device that can be easily translated to clinical settings. Our results indicate that baseline microvascular impairments in structure and function can be detected using the CytoCam technology, although reactivity to acetylcholine may be maintained even during disease in the peripheral microcirculation.
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Affiliation(s)
- Boran Katunaric
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Gopika SenthilKumar
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Forrest J Stehula
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Alec Werthman
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Henry Bordas-Murphy
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Julie K Freed
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
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3
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Behem CR, Friedheim T, Holthusen H, Rapp A, Suntrop T, Graessler MF, Pinnschmidt HO, Wipper SH, von Lucadou M, Schwedhelm E, Renné T, Pfister K, Schierling W, Trepte CJC. Goal-directed colloid versus crystalloid therapy and microcirculatory blood flow following ischemia/reperfusion. Microvasc Res 2024; 152:104630. [PMID: 38048876 DOI: 10.1016/j.mvr.2023.104630] [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: 09/08/2023] [Revised: 11/11/2023] [Accepted: 11/25/2023] [Indexed: 12/06/2023]
Abstract
OBJECTIVE Ischemia/reperfusion can impair microcirculatory blood flow. It remains unknown whether colloids are superior to crystalloids for restoration of microcirculatory blood flow during ischemia/reperfusion injury. We tested the hypothesis that goal-directed colloid - compared to crystalloid - therapy improves small intestinal, renal, and hepatic microcirculatory blood flow in pigs with ischemia/reperfusion injury. METHODS This was a randomized trial in 32 pigs. We induced ischemia/reperfusion by supra-celiac aortic-cross-clamping. Pigs were randomized to receive either goal-directed isooncotic hydroxyethyl-starch colloid or balanced isotonic crystalloid therapy. Microcirculatory blood flow was measured using Laser-Speckle-Contrast-Imaging. The primary outcome was small intestinal, renal, and hepatic microcirculatory blood flow 4.5 h after ischemia/reperfusion. Secondary outcomes included small intestinal, renal, and hepatic histopathological damage, macrohemodynamic and metabolic variables, as well as specific biomarkers of tissue injury, renal, and hepatic function and injury, and endothelial barrier function. RESULTS Small intestinal microcirculatory blood flow was higher in pigs assigned to isooncotic hydroxyethyl-starch colloid therapy than in pigs assigned to balanced isotonic crystalloid therapy (768.7 (677.2-860.1) vs. 595.6 (496.3-694.8) arbitrary units, p = .007). There were no important differences in renal (509.7 (427.2-592.1) vs. 442.1 (361.2-523.0) arbitrary units, p = .286) and hepatic (604.7 (507.7-701.8) vs. 548.7 (444.0-653.3) arbitrary units, p = .376) microcirculatory blood flow between groups. Pigs assigned to colloid - compared to crystalloid - therapy also had less small intestinal, but not renal and hepatic, histopathological damage. CONCLUSIONS Goal-directed isooncotic hydroxyethyl-starch colloid - compared to balanced isotonic crystalloid - therapy improved small intestinal, but not renal and hepatic, microcirculatory blood flow in pigs with ischemia/reperfusion injury. Whether colloid therapy improves small intestinal microcirculatory blood flow in patients with ischemia/reperfusion needs to be investigated in clinical trials.
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Affiliation(s)
- Christoph R Behem
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Till Friedheim
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hannes Holthusen
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Adina Rapp
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Timo Suntrop
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Michael F Graessler
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hans O Pinnschmidt
- Department of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sabine H Wipper
- Department of Vascular Medicine, University Heart and Vascular Center Hamburg (UHZ), Hamburg, Germany
| | - Mirjam von Lucadou
- Institute of Clinical Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Edzard Schwedhelm
- Institute of Clinical Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Thomas Renné
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland; Center for Thrombosis and Hemostasis (CTH), Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Karin Pfister
- Department of Vascular Surgery, University Medical Center Regensburg, Regensburg, Germany
| | - Wilma Schierling
- Department of Vascular Surgery, University Medical Center Regensburg, Regensburg, Germany
| | - Constantin J C Trepte
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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4
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Saugel B, Annecke T, Bein B, Flick M, Goepfert M, Gruenewald M, Habicher M, Jungwirth B, Koch T, Kouz K, Meidert AS, Pestel G, Renner J, Sakka SG, Sander M, Treskatsch S, Zitzmann A, Reuter DA. Intraoperative haemodynamic monitoring and management of adults having non-cardiac surgery: Guidelines of the German Society of Anaesthesiology and Intensive Care Medicine in collaboration with the German Association of the Scientific Medical Societies. J Clin Monit Comput 2024:10.1007/s10877-024-01132-7. [PMID: 38381359 DOI: 10.1007/s10877-024-01132-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 01/25/2024] [Indexed: 02/22/2024]
Abstract
Haemodynamic monitoring and management are cornerstones of perioperative care. The goal of haemodynamic management is to maintain organ function by ensuring adequate perfusion pressure, blood flow, and oxygen delivery. We here present guidelines on "Intraoperative haemodynamic monitoring and management of adults having non-cardiac surgery" that were prepared by 18 experts on behalf of the German Society of Anaesthesiology and Intensive Care Medicine (Deutsche Gesellschaft für Anästhesiologie und lntensivmedizin; DGAI).
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Affiliation(s)
- Bernd Saugel
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
- Outcomes Research Consortium, Cleveland, OH, USA.
| | - Thorsten Annecke
- Department of Anesthesiology and Intensive Care Medicine, Cologne Merheim Medical Center, Hospital of the University of Witten/Herdecke, Cologne, Germany
| | - Berthold Bein
- Department for Anaesthesiology, Asklepios Hospital Hamburg St. Georg, Hamburg, Germany
| | - Moritz Flick
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Matthias Goepfert
- Department of Anaesthesiology and Intensive Care Medicine, Alexianer St. Hedwigkliniken Berlin, Berlin, Germany
| | - Matthias Gruenewald
- Department of Anaesthesiology and Intensive Care Medicine, Evangelisches Amalie Sieveking Krankenhaus, Hamburg, Germany
| | - Marit Habicher
- Department of Anaesthesiology, Intensive Care Medicine and Pain Medicine, University Hospital Giessen, Justus-Liebig University Giessen, Giessen, Germany
| | - Bettina Jungwirth
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Ulm, Ulm, Germany
| | - Tilo Koch
- Department of Anesthesiology and Intensive Care, Philipps-University Marburg, Marburg, Germany
| | - Karim Kouz
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Outcomes Research Consortium, Cleveland, OH, USA
| | - Agnes S Meidert
- Department of Anaesthesiology, University Hospital LMU Munich, Munich, Germany
| | - Gunther Pestel
- Department of Anesthesiology, University Medical Center of the Johannes Gutenberg-University, Mainz, Germany
| | - Jochen Renner
- Department of Anesthesiology and Intensive Care Medicine, Municipal Hospital Kiel, Kiel, Germany
| | - Samir G Sakka
- Department of Intensive Care Medicine, Gemeinschaftsklinikum Mittelrhein gGmbH, Academic Teaching Hospital of the Johannes Gutenberg University Mainz, Koblenz, Germany
| | - Michael Sander
- Department of Anaesthesiology, Intensive Care Medicine and Pain Medicine, University Hospital Giessen, Justus-Liebig University Giessen, Giessen, Germany
| | - Sascha Treskatsch
- Department of Anesthesiology and Intensive Care Medicine, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt Universität zu Berlin, Charité Campus Benjamin Franklin, Berlin, Germany
| | - Amelie Zitzmann
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Medical Centre of Rostock, Rostock, Germany
| | - Daniel A Reuter
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Medical Centre of Rostock, Rostock, Germany
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5
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Flick M, Hilty MP, Duranteau J, Saugel B. The microcirculation in perioperative medicine: a narrative review. Br J Anaesth 2024; 132:25-34. [PMID: 38030549 DOI: 10.1016/j.bja.2023.10.033] [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: 06/23/2023] [Revised: 09/25/2023] [Accepted: 10/10/2023] [Indexed: 12/01/2023] Open
Abstract
The microcirculation describes the network of the smallest vessels in our cardiovascular system. On a microcirculatory level, oxygen delivery is determined by the flow of oxygen-carrying red blood cells in a given single capillary (capillary red blood cell flow) and the density of the capillary network in a given tissue volume (capillary vessel density). Handheld vital videomicroscopy enables visualisation of the capillary bed on the surface of organs and tissues but currently is only used for research. Measurements are generally possible on all organ surfaces but are most often performed in the sublingual area. In patients presenting for elective surgery, the sublingual microcirculation is usually intact and functional. Induction of general anaesthesia slightly decreases capillary red blood cell flow and increases capillary vessel density. During elective, even major, noncardiac surgery, the sublingual microcirculation is preserved and remains functional, presumably because elective noncardiac surgery is scheduled trauma and haemodynamic alterations are immediately treated by anaesthesiologists, usually restoring the macrocirculation before the microcirculation is substantially impaired. Additionally, surgery is regional trauma and thus likely causes regional, rather than systemic, impairment of the microcirculation. Whether or not the sublingual microcirculation is impaired after noncardiac surgery remains a subject of ongoing research. Similarly, it remains unclear if cardiac surgery, especially with cardiopulmonary bypass, impairs the sublingual microcirculation. The effects of therapeutic interventions specifically targeting the microcirculation remain to be elucidated and tested. Future research should focus on further improving microcirculation monitoring methods and investigating how regional microcirculation monitoring can inform clinical decision-making and treatment.
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Affiliation(s)
- Moritz Flick
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Matthias P Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Zurich, Switzerland
| | - Jacques Duranteau
- Department of Anesthesiology and Intensive Care, Paris-Saclay University, Bicêtre Hospital, Assistance Publique Hôpitaux de Paris (AP-HP), Le Kremlin-Bicêtre, France
| | - Bernd Saugel
- Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Outcomes Research Consortium, Cleveland, OH, USA
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Koutsiaris AG, Riri K, Boutlas S, Daniil Z, Tsironi EE. A normative blood velocity model in the exchange microvessels for discriminating health from disease: Healthy controls versus COVID-19 cases. Clin Hemorheol Microcirc 2023:CH231780. [PMID: 37182862 DOI: 10.3233/ch-231780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A usual practice in medicine is to search for "biomarkers" which are measurable quantities of a normal or abnormal biological process. Biomarkers can be biochemical or physical quantities of the body and although commonly used statistically in clinical settings, it is not usual for them to be connected to basic physiological models or equations. In this work, a normative blood velocity model framework for the exchange microvessels was introduced, combining the velocity-diffusion (V-J) equation and statistics, in order to define the normative range (NR) and normative area (NA) diagrams for discriminating normal (normemic) from abnormal (hyperemic or underemic) states, taking into account the microvessel diameter D. This is different from the usual statistical processing since there is a basis on the well-known physiological principle of the flow diffusion equation. The discriminative power of the average axial velocity model was successfully tested using a group of healthy individuals (Control Group) and a group of post COVID-19 patients (COVID-19 Group).
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Affiliation(s)
- Aristotle G Koutsiaris
- Medical Informatics and Biomedical Imaging (MIBI) Laboratory, Faculty of Medicine, School of Health Sciences, University of Thessaly, Biopolis Campus, Larissa, Greece
| | - Konstantina Riri
- Department of Ophthalmology, University Hospital of Larissa, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Stylianos Boutlas
- Department of Respiratory Medicine, University Hospital of Larissa, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Zoe Daniil
- Department of Respiratory Medicine, University Hospital of Larissa, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Evangelia E Tsironi
- Department of Ophthalmology, University Hospital of Larissa, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
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7
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Laou E, Papagiannakis N, Michou A, Ntalarizou N, Ragias D, Angelopoulou Z, Sessler DI, Chalkias A. Association between mean arterial pressure and sublingual microcirculation during major non-cardiac surgery: Post hoc analysis of a prospective cohort. Microcirculation 2023; 30:e12804. [PMID: 36905347 DOI: 10.1111/micc.12804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/13/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023]
Abstract
OBJECTIVE To test the hypothesis that there is an association between mean arterial pressure (MAP) and sublingual perfusion during major surgery, and perhaps an identifiable harm threshold. METHODS This post hoc analysis of a prospective cohort included patients who had elective major non-cardiac surgery with a duration of ≥2 h under general anesthesia. We assessed sublingual microcirculation every 30 min using SDF+ imaging and determined the De Backer score, Consensus Proportion of Perfused Vessels (Consensus PPV), and the Consensus PPV (small). Our primary outcome was the relationship between MAP and sublingual perfusion which was evaluated with linear mixed effects modeling. RESULTS A total of 100 patients were included, with MAP ranging between 65 mmHg and 120 mmHg during anesthesia and surgery. Over a range of intraoperative MAPs between 65 and 120 mmHg, there were no meaningful associations between blood pressure and various measures of sublingual perfusion. There were also no meaningful changes in microcirculatory flow over 4.5 h of surgery. CONCLUSIONS In patients having elective major non-cardiac surgery with general anesthesia, sublingual microcirculation is well maintained when MAP ranges between 65 and 120 mmHg. It remains possible that sublingual perfusion will be a useful marker of tissue perfusion when MAP is lower than 65 mmHg.
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Affiliation(s)
- Eleni Laou
- Department of Anesthesiology, Agia Sophia Children's Hospital, Athens, Greece
| | - Nikolaos Papagiannakis
- First Department of Neurology, Eginition University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Anastasia Michou
- Department of Anesthesiology, Faculty of Medicine, University of Thessaly, Larisa, Greece
| | - Nicoleta Ntalarizou
- Department of Anesthesiology, Faculty of Medicine, University of Thessaly, Larisa, Greece
| | - Dimitrios Ragias
- Department of Anesthesiology, Faculty of Medicine, University of Thessaly, Larisa, Greece
| | | | - Daniel I Sessler
- Department of Outcomes Research, Cleveland Clinic, Cleveland, Ohio, USA
| | - Athanasios Chalkias
- Department of Anesthesiology, Faculty of Medicine, University of Thessaly, Larisa, Greece
- Outcomes Research Consortium, Cleveland, Ohio, USA
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8
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Hilty MP, Favaron E, Wendel Garcia PD, Ahiska Y, Uz Z, Akin S, Flick M, Arbous S, Hofmaenner DA, Saugel B, Endeman H, Schuepbach RA, Ince C. Microcirculatory alterations in critically ill COVID-19 patients analyzed using artificial intelligence. Crit Care 2022; 26:311. [PMID: 36242010 PMCID: PMC9568900 DOI: 10.1186/s13054-022-04190-y] [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: 05/13/2022] [Accepted: 10/10/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The sublingual microcirculation presumably exhibits disease-specific changes in function and morphology. Algorithm-based quantification of functional microcirculatory hemodynamic variables in handheld vital microscopy (HVM) has recently allowed identification of hemodynamic alterations in the microcirculation associated with COVID-19. In the present study we hypothesized that supervised deep machine learning could be used to identify previously unknown microcirculatory alterations, and combination with algorithmically quantified functional variables increases the model's performance to differentiate critically ill COVID-19 patients from healthy volunteers. METHODS Four international, multi-central cohorts of critically ill COVID-19 patients and healthy volunteers (n = 59/n = 40) were used for neuronal network training and internal validation, alongside quantification of functional microcirculatory hemodynamic variables. Independent verification of the models was performed in a second cohort (n = 25/n = 33). RESULTS Six thousand ninety-two image sequences in 157 individuals were included. Bootstrapped internal validation yielded AUROC(CI) for detection of COVID-19 status of 0.75 (0.69-0.79), 0.74 (0.69-0.79) and 0.84 (0.80-0.89) for the algorithm-based, deep learning-based and combined models. Individual model performance in external validation was 0.73 (0.71-0.76) and 0.61 (0.58-0.63). Combined neuronal network and algorithm-based identification yielded the highest externally validated AUROC of 0.75 (0.73-0.78) (P < 0.0001 versus internal validation and individual models). CONCLUSIONS We successfully trained a deep learning-based model to differentiate critically ill COVID-19 patients from heathy volunteers in sublingual HVM image sequences. Internally validated, deep learning was superior to the algorithmic approach. However, combining the deep learning method with an algorithm-based approach to quantify the functional state of the microcirculation markedly increased the sensitivity and specificity as compared to either approach alone, and enabled successful external validation of the identification of the presence of microcirculatory alterations associated with COVID-19 status.
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Affiliation(s)
- Matthias Peter Hilty
- grid.412004.30000 0004 0478 9977Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland ,grid.5645.2000000040459992XDepartment of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Emanuele Favaron
- grid.5645.2000000040459992XDepartment of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Pedro David Wendel Garcia
- grid.412004.30000 0004 0478 9977Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | | | - Zuhre Uz
- grid.10419.3d0000000089452978Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands
| | - Sakir Akin
- grid.413591.b0000 0004 0568 6689Department of Intensive Care, Haga Hospital, The Hague, The Netherlands
| | - Moritz Flick
- grid.13648.380000 0001 2180 3484Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sesmu Arbous
- grid.10419.3d0000000089452978Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands
| | - Daniel A. Hofmaenner
- grid.412004.30000 0004 0478 9977Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | - Bernd Saugel
- grid.13648.380000 0001 2180 3484Department of Anesthesiology, Center of Anesthesiology and Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Henrik Endeman
- grid.5645.2000000040459992XDepartment of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Reto Andreas Schuepbach
- grid.412004.30000 0004 0478 9977Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | - Can Ince
- grid.5645.2000000040459992XDepartment of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
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