1
|
Brouwer F, Ince C, Pols J, Uz Z, Hilty MP, Arbous MS. The microcirculation in the first days of ICU admission in critically ill COVID-19 patients is influenced by severity of disease. Sci Rep 2024; 14:6454. [PMID: 38499589 PMCID: PMC10948764 DOI: 10.1038/s41598-024-56245-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 03/04/2024] [Indexed: 03/20/2024] Open
Abstract
The objective of this study was to investigate the relationship between sublingual microcirculatory parameters and the severity of the disease in critically ill coronavirus disease 2019 (COVID-19) patients in the initial period of Intensive Care Unit (ICU) admission in a phase of the COVID-19 pandemic where patients were being treated with anti-inflammatory medication. In total, 35 critically ill COVID-19 patients were included. Twenty-one critically ill COVID-19 patients with a Sequential Organ Failure Assessment (SOFA) score below or equal to 7 were compared to 14 critically ill COVID-19 patients with a SOFA score exceeding 7. All patients received dexamethasone and tocilizumab at ICU admission. Microcirculatory measurements were performed within the first five days of ICU admission, preferably as soon as possible after admission. An increase in diffusive capacity of the microcirculation (total vessel density, functional capillary density, capillary hematocrit) and increased perfusion of the tissues by red blood cells was found in the critically ill COVID-19 patients with a SOFA score of 7-9 compared to the critically ill COVID-19 patients with a SOFA score ≤ 7. No such effects were found in the convective component of the microcirculation. These effects occurred in the presence of administration of anti-inflammatory medication.
Collapse
Affiliation(s)
- Fleur Brouwer
- Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands
| | - Can Ince
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Jiska Pols
- Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands
| | - Zühre Uz
- Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands
| | - Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Zurich, Switzerland
| | - Mendi Sesmu Arbous
- Department of Intensive Care, Leiden University Medical Center, Leiden, The Netherlands.
| |
Collapse
|
2
|
Hilty MP, Siebenmann C, Rasmussen P, Keiser S, Müller A, Lundby C, Maggiorini M. Beta-adrenergic blockade increases pulmonary vascular resistance and causes exaggerated hypoxic pulmonary vasoconstriction at high altitude: a physiological study. Eur Heart J Cardiovasc Pharmacother 2024:pvae004. [PMID: 38216517 DOI: 10.1093/ehjcvp/pvae004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
Abstract
BACKGROUND An increasing number of hypertensive persons travel to high altitude while using antihypertensive medications such as betablockers. Nevertheless, while hypoxic exposure initiates an increase in pulmonary artery pressure (Ppa) and pulmonary vascular resistance (PVR), the contribution of the autonomic nervous system is unclear. In animals, β-adrenergic blockade has induced pulmonary vasoconstriction in normoxia and exaggerated hypoxic pulmonary vasoconstriction (HPV) and both effects were abolished by muscarinic blockade. We thus hypothesized that in humans propranolol (PROP) increases Ppa and PVR in normoxia and exaggerates HPV, and that these effects of PROP are abolished by glycopyrrolate (GLYC). METHODS In seven healthy male lowlanders, pulmonary artery pressure was invasively measured without medication, with PROP and PROP+GLYC, both at sea level (SL, 488m) and after a three-week sojourn at 3454m altitude (HA). Bilateral thigh-cuff release maneuvers were performed to derive pulmonary pressure-flow relationships and pulmonary vessel distensibility. RESULTS At SL, PROP increased Ppa and PVR from (mean±SEM) 14±1 to 17±1mmHg and from 69±8 to 108±11dyn*s*cm-5 (21 and 57% increase, p=0.01 and p<0.0001). The PVR response to PROP was amplified at HA to 76% (p<0.0001, p[interaction]=0.05). At both altitudes, PROP+GLYC abolished the effect of PROP on Ppa and PVR. Pulmonary vessel distensibility decreased from 2.9±0.5 to 1.7±0.2 at HA (p<0.0001) and to 1.2±0.2 with PROP, and further decreased to 0.9±0.2%*mmHg-1 with PROP+GLYC (p=0.01). CONCLUSIONS Our data show that β-adrenergic blockade increases, and muscarinic blockade decreases PVR, whereas both increase pulmonary artery elastance. Future studies may confirm potential implications from the finding that β-adrenergic blockade exaggerates HPV for the management of mountaineers using β-blockers for prevention or treatment of cardiovascular conditions.
Collapse
Affiliation(s)
- Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | - Christoph Siebenmann
- Center for Integrative Human Physiology (ZIHP), Institute of Physiology, University of Zurich, Switzerland
- Institute of Mountain Emergency Medicine, EURAC Research, Bolzano, Italy
| | - Peter Rasmussen
- Center for Integrative Human Physiology (ZIHP), Institute of Physiology, University of Zurich, Switzerland
| | - Stefanie Keiser
- Center for Integrative Human Physiology (ZIHP), Institute of Physiology, University of Zurich, Switzerland
| | - Andrea Müller
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | - Carsten Lundby
- Center for Integrative Human Physiology (ZIHP), Institute of Physiology, University of Zurich, Switzerland
- Department of Health and Exercise Physiology, Inland Norway University of Applied Sciences, Lillehammer, Norway
| | - Marco Maggiorini
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| |
Collapse
|
3
|
Wendel-Garcia PD, Eberle B, Kleinert EM, Hilty MP, Blumenthal S, Spanaus K, Fodor P, Maggiorini M. Effects of enhanced adsorption haemofiltration versus haemoadsorption in severe, refractory septic shock with high levels of endotoxemia: the ENDoX bicentric, randomized, controlled trial. Ann Intensive Care 2023; 13:127. [PMID: 38095800 PMCID: PMC10721780 DOI: 10.1186/s13613-023-01224-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/06/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND Endotoxin adsorption is a promising but controversial therapy in severe, refractory septic shock and conflicting results exist on the effective capacity of available devices to reduce circulating endotoxin and inflammatory cytokine levels. METHODS Multiarm, randomized, controlled trial in two Swiss intensive care units, with a 1:1:1 randomization of patients suffering severe, refractory septic shock with high levels of endotoxemia, defined as an endotoxin activity ≥ 0.6, a vasopressor dependency index ≥ 3, volume resuscitation of at least 30 ml/kg/24 h and at least single organ failure, to a haemoadsorption (Toraymyxin), an enhanced adsorption haemofiltration (oXiris) or a control intervention. Primary endpoint was the difference in endotoxin activity at 72-h post-intervention to baseline. In addition, inflammatory cytokine, vasopressor dependency index and SOFA-Score dynamics over the initial 72 h were assessed inter alia. RESULTS In the 30, out of 437 screened, randomized patients (10 Standard of care, 10 oXiris, 10 Toraymyxin), endotoxin reduction at 72-h post-intervention-start did not differ among interventions (Standard of Care: 12 [1-42]%, oXiris: 21 [10-51]%, Toraymyxin: 23 [10-36]%, p = 0.82). Furthermore, no difference between groups could be observed neither for reduction of inflammatory cytokine levels (p = 0.58), nor for vasopressor weaning (p = 0.95) or reversal of organ injury (p = 0.22). CONCLUSIONS In a highly endotoxemic, severe, refractory septic shock population neither the Toraymyxin adsorber nor the oXiris membrane could show a reduction in circulating endotoxin or cytokine levels over standard of care. Trial registration ClinicalTrials.gov. NCT01948778. Registered August 30, 2013. https://clinicaltrials.gov/study/NCT01948778.
Collapse
Affiliation(s)
- Pedro David Wendel-Garcia
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
| | - Barbara Eberle
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Eva-Maria Kleinert
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | | | - Katharina Spanaus
- Institute of Clinical Chemistry, University Hospital Zurich, Zurich, Switzerland
| | - Patricia Fodor
- Institute of Intensive Care Medicine, Triemli Hospital, Zurich, Switzerland
| | - Marco Maggiorini
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| |
Collapse
|
4
|
Uz Z, Dilken O, Milstein DMJ, Hilty MP, de Haan D, Ince Y, Shen L, Houtzager J, Franken LC, van Gulik TM, Ince C. Identifying a sublingual triangle as the ideal site for assessment of sublingual microcirculation. J Clin Monit Comput 2023; 37:639-649. [PMID: 36355276 PMCID: PMC10068634 DOI: 10.1007/s10877-022-00936-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 10/15/2022] [Indexed: 11/11/2022]
Abstract
The sublingual mucosa is a commonly used intraoral location for identifying microcirculatory alterations using handheld vital microscopes (HVMs). The anatomic description of the sublingual cave and its related training have not been adequately introduced. The aim of this study was to introduce anatomy guided sublingual microcirculatory assessment. Measurements were acquired from the floor of the mouth using incident dark-field (IDF) imaging before (T0) and after (T1) sublingual cave anatomy instructed training. Instructions consists of examining a specific region of interested identified through observable anatomical structures adjacent and bilaterally to the lingual frenulum which is next to the sublingual papilla. The anatomical location called the sublingual triangle, was identified as stationed between the lingual frenulum, the sublingual fold and ventrally to the tongue. Small, large, and total vessel density datasets (SVD, LVD and TVD respectively) obtained by non-instructed and instructed measurements (NIN (T0) and IM (T1) respectively) were compared. Microvascular structures were analyzed, and the presence of salivary duct-related microcirculation was identified. A total of 72 video clips were used for analysis in which TVD, but not LVD and SVD, was higher in IM compared to NIM (NIM vs. IM, 25 ± 2 vs. 27 ± 3 mm/mm2 (p = 0.044), LVD NIM vs. IM: 7 ± 1 vs. 8 ± 1mm/mm2 (p = 0.092), SVD NIM vs. IM: 18 ± 2 vs. 20 ± 3 mm/mm2 (p = 0.103)). IM resulted in microcirculatory assessments which included morphological properties such as capillaries, venules and arterioles, without salivary duct-associated microcirculation. The sublingual triangle identified in this study showed consistent network-based microcirculation, without interference from microcirculation associated with specialized anatomic structures. These findings suggest that the sublingual triangle, an anatomy guided location, yielded sublingual based measurements that conforms with international guidelines. IM showed higher TVD values, and future studies are needed with larger sample sizes to prove differences in microcirculatory parameters.
Collapse
Affiliation(s)
- Zühre Uz
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands.
- Department of Surgery, Location: AMC, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.
- Department of Intensive Care, Erasmus MC, University Medical Centre, Rotterdam, the Netherlands.
| | - Olcay Dilken
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| | - Dan M J Milstein
- Department of Oral & Maxillofacial Surgery, Location: AMC, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Department of Oral Medicine, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands
| | - Matthias Peter Hilty
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| | - David de Haan
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| | - Yasin Ince
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| | - Lucinda Shen
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| | - Julia Houtzager
- Department of Surgery, Location: AMC, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Lotte C Franken
- Department of Surgery, Location: AMC, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Thomas M van Gulik
- Department of Surgery, Location: AMC, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Can Ince
- Department of Translational Physiology, Location: AMC, Amsterdam University Medical Centre (UMC), University of Amsterdam, Amsterdam, The Netherlands
| |
Collapse
|
5
|
Seiler T, Nakas CT, Brill AK, Hefti U, Hilty MP, Perret-Hoigné E, Sailer J, Kabitz HJ, Merz TM, Pichler Hefti J. Do cardiopulmonary exercise tests predict summit success and acute mountain sickness? A prospective observational field study at extreme altitude. Br J Sports Med 2023:bjsports-2022-106211. [PMID: 36898769 DOI: 10.1136/bjsports-2022-106211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2023] [Indexed: 03/12/2023]
Abstract
OBJECTIVE During a high-altitude expedition, the association of cardiopulmonary exercise testing (CPET) parameters with the risk of developing acute mountain sickness (AMS) and the chance of reaching the summit were investigated. METHODS Thirty-nine subjects underwent maximal CPET at lowlands and during ascent to Mount Himlung Himal (7126 m) at 4844 m, before and after 12 days of acclimatisation, and at 6022 m. Daily records of Lake-Louise-Score (LLS) determined AMS. Participants were categorised as AMS+ if moderate to severe AMS occurred. RESULTS Maximal oxygen uptake (V̇O2max) decreased by 40.5%±13.7% at 6022 m and improved after acclimatisation (all p<0.001). Ventilation at maximal exercise (VEmax) was reduced at 6022 m, but higher VEmax was related to summit success (p=0.031). In the 23 AMS+ subjects (mean LLS 7.4±2.4), a pronounced exercise-induced oxygen desaturation (ΔSpO2exercise) was found after arrival at 4844 m (p=0.005). ΔSpO2exercise >-14.0% identified 74% of participants correctly with a sensitivity of 70% and specificity of 81% for predicting moderate to severe AMS. All 15 summiteers showed higher V̇O2max (p<0.001), and a higher risk of AMS in non-summiteers was suggested but did not reach statistical significance (OR: 3.64 (95% CI: 0.78 to 17.58), p=0.057). V̇O2max ≥49.0 mL/min/kg at lowlands and ≥35.0 mL/min/kg at 4844 m predicted summit success with a sensitivity of 46.7% and 53.3%, and specificity of 83.3% and 91.3%, respectively. CONCLUSION Summiteers were able to sustain higher VEmax throughout the expedition. Baseline V̇O2max below 49.0 mL/min/kg was associated with a high chance of 83.3% for summit failure, when climbing without supplemental oxygen. A pronounced drop of SpO2exercise at 4844 m may identify climbers at higher risk of AMS.
Collapse
Affiliation(s)
- Thomas Seiler
- Department of Pulmonary Medicine, Inselspital,Bern University Hospital, University of Bern, Bern, Switzerland
| | - Christos T Nakas
- Institute of Clinical Chemistry, Inselspital University Hospital, University of Bern, Bern, Switzerland.,Laboratory of Biometry, University of Thessaly, Volos, Greece
| | - Anne-Kathrin Brill
- Department of Pulmonary Medicine, Inselspital,Bern University Hospital, University of Bern, Bern, Switzerland
| | - Urs Hefti
- Swiss Sportclinic, Bern, Switzerland
| | - Matthias Peter Hilty
- Department of Intensive Care Medicine, University Hospital Zurich, Zurich, Switzerland
| | - Eveline Perret-Hoigné
- Department of Pediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Jannis Sailer
- Swiss Sportclinic, Bern, Switzerland.,Orthopedics and Traumatology, Hospital Nidwalden, Stans, Switzerland
| | - Hans-Joachim Kabitz
- Department of Internal Medicine II Pneumology Cardiology Intensive Care Medicine, Klinikum Konstanz, Konstanz, Germany
| | - Tobias M Merz
- Cardiovascular Intensive Care Unit, Auckland City Hospital, Auckland, New Zealand.,Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, University of Bern, Bern, Switzerland
| | - Jacqueline Pichler Hefti
- Department of Pulmonary Medicine, Inselspital,Bern University Hospital, University of Bern, Bern, Switzerland .,Swiss Sportclinic, Bern, Switzerland
| |
Collapse
|
6
|
Wendel-Garcia PD, Moser A, Jeitziner MM, Aguirre-Bermeo H, Arias-Sanchez P, Apolo J, Roche-Campo F, Franch-Llasat D, Kleger GR, Schrag C, Pietsch U, Filipovic M, David S, Stahl K, Bouaoud S, Ouyahia A, Fodor P, Locher P, Siegemund M, Zellweger N, Cereghetti S, Schott P, Gangitano G, Wu MA, Alfaro-Farias M, Vizmanos-Lamotte G, Ksouri H, Gehring N, Rezoagli E, Turrini F, Lozano-Gómez H, Carsetti A, Rodríguez-García R, Yuen B, Weber AB, Castro P, Escos-Orta JO, Dullenkopf A, Martín-Delgado MC, Aslanidis T, Perez MH, Hillgaertner F, Ceruti S, Franchitti Laurent M, Marrel J, Colombo R, Laube M, Fogagnolo A, Studhalter M, Wengenmayer T, Gamberini E, Buerkle C, Buehler PK, Keiser S, Elhadi M, Montomoli J, Guerci P, Fumeaux T, Schuepbach RA, Jakob SM, Que YA, Hilty MP, Hilty MP, Wendel-Garcia P, Schuepbach RA, Montomoli J, Guerci P, Fumeaux T, Bouaoud S, Ouyahia A, Abdoun M, Rais M, Alfaro-Farias M, Vizmanos-Lamotte G, Caballero A, Tschoellitsch T, Meier J, Aguirre-Bermeo H, Arias-Sanchez P, Apolo J, Martinez LA, Tirapé-Castro H, Galal I, Tharwat S, Abdehaleem I, Jurkolow G, Guerci P, Novy E, Losser MR, Wengenmayer T, Zotzmann V, David S, Stahl K, Seeliger B, Welte T, Aslanidis T, Korsos A, Ahmed LA, Hashim HT, Nikandish R, Carsetti A, Casarotta E, Giaccaglia P, Rezoagli E, Giacomini M, Magliocca A, Bolondi G, Potalivo A, Fogagnolo A, Salvi L, Wu MA, Cogliati C, Colombo R, Catena E, Turrini F, Simonini MS, Fabbri S, Montomoli J, Gamberini E, Gangitano G, Bitondo MM, Maciopinto F, de Camillis E, Venturi M, Bocci MG, Antonelli M, Alansari A, Abusalama A, Omar O, Binnawara M, Alameen H, Elhadi M, Alhadi A, Arhaym A, Gommers D, Ince C, Jayyab M, Alsharif M, Rodríguez-García R, Gámez-Zapata J, Taboada-Fraga X, Castro P, Fernandez J, Reverter E, Lander-Azcona A, Escós-Orta J, Martín-Delgado MC, Algaba-Calderon A, Roche-Campo F, Franch-Llasat D, Concha P, Sauras-Colón E, Lozano-Gómez H, Zalba-Etayo B, Montes MP, Michot MP, Klarer A, Ensner R, Schott P, Urech S, Siegemund M, Zellweger N, Gebhard CE, Hollinger A, Merki L, Lambert A, Laube M, Jeitziner MM, Moser A, Que YA, Jakob SM, Wiegand J, Yuen B, Lienhardt-Nobbe B, Westphalen A, Salomon P, Hillgaertner F, Sieber M, Dullenkopf A, Barana G, Ksouri H, Sridharan GO, Cereghetti S, Boroli F, Pugin J, Grazioli S, Bürkle C, Marrel J, Brenni M, Fleisch I, Perez MH, Ramelet AS, Weber AB, Gerecke P, Christ A, Ceruti S, Glotta A, Biggiogero M, Marquardt K, Hübner T, Neff T, Redecker H, Fumeaux T, Moret-Bochatay M, Betello M, zu Bentrup FM, Studhalter M, Stephan M, Gehring N, Selz D, Kleger GR, Schrag C, Pietsch U, Filipovic M, Ristic A, Heise A, Franchitti Laurent M, Laurent JC, Gaspert T, Haberthuer C, Fodor P, Locher P, Garcia PDW, Hilty MP, Schuepbach R, Keiser S, Heuberger D, Bartussek J, Bühler P, Brugger S, Kleinert EM, Fehlbier KJ, Danial A, Almousa M, Abdulbaki Y, Sannah K, Colak E, Marczin N, Al-Ameri S. Dynamics of disease characteristics and clinical management of critically ill COVID-19 patients over the time course of the pandemic: an analysis of the prospective, international, multicentre RISC-19-ICU registry. Crit Care 2022; 26:199. [PMID: 35787726 PMCID: PMC9254551 DOI: 10.1186/s13054-022-04065-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 06/10/2022] [Indexed: 12/22/2022] Open
Abstract
Background It remains elusive how the characteristics, the course of disease, the clinical management and the outcomes of critically ill COVID-19 patients admitted to intensive care units (ICU) worldwide have changed over the course of the pandemic. Methods Prospective, observational registry constituted by 90 ICUs across 22 countries worldwide including patients with a laboratory-confirmed, critical presentation of COVID-19 requiring advanced organ support. Hierarchical, generalized linear mixed-effect models accounting for hospital and country variability were employed to analyse the continuous evolution of the studied variables over the pandemic. Results Four thousand forty-one patients were included from March 2020 to September 2021. Over this period, the age of the admitted patients (62 [95% CI 60–63] years vs 64 [62–66] years, p < 0.001) and the severity of organ dysfunction at ICU admission decreased (Sequential Organ Failure Assessment 8.2 [7.6–9.0] vs 5.8 [5.3–6.4], p < 0.001) and increased, while more female patients (26 [23–29]% vs 41 [35–48]%, p < 0.001) were admitted. The time span between symptom onset and hospitalization as well as ICU admission became longer later in the pandemic (6.7 [6.2–7.2| days vs 9.7 [8.9–10.5] days, p < 0.001). The PaO2/FiO2 at admission was lower (132 [123–141] mmHg vs 101 [91–113] mmHg, p < 0.001) but showed faster improvements over the initial 5 days of ICU stay in late 2021 compared to early 2020 (34 [20–48] mmHg vs 70 [41–100] mmHg, p = 0.05). The number of patients treated with steroids and tocilizumab increased, while the use of therapeutic anticoagulation presented an inverse U-shaped behaviour over the course of the pandemic. The proportion of patients treated with high-flow oxygen (5 [4–7]% vs 20 [14–29], p < 0.001) and non-invasive mechanical ventilation (14 [11–18]% vs 24 [17–33]%, p < 0.001) throughout the pandemic increased concomitant to a decrease in invasive mechanical ventilation (82 [76–86]% vs 74 [64–82]%, p < 0.001). The ICU mortality (23 [19–26]% vs 17 [12–25]%, p < 0.001) and length of stay (14 [13–16] days vs 11 [10–13] days, p < 0.001) decreased over 19 months of the pandemic. Conclusion Characteristics and disease course of critically ill COVID-19 patients have continuously evolved, concomitant to the clinical management, throughout the pandemic leading to a younger, less severely ill ICU population with distinctly different clinical, pulmonary and inflammatory presentations than at the onset of the pandemic. Supplementary Information The online version contains supplementary material available at 10.1186/s13054-022-04065-2.
Collapse
|
7
|
Konopasek SM, Klinzing S, Wendel Garcia PD, Hilty MP, Maggiorini M. Increased Longevity of a Novel Gas Exchanger System for Low-Flow Veno-Venous Extracorporeal CO<sub>2</sub> Removal in Acute Hypercapnic Respiratory Failure. Blood Purif 2022; 52:275-284. [PMID: 37068476 PMCID: PMC10129028 DOI: 10.1159/000526582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 07/15/2022] [Indexed: 11/07/2022]
Abstract
<b><i>Introduction:</i></b> Low-flow veno-venous extracorporeal CO<sub>2</sub> removal (ECCO<sub>2</sub>R) is an adjunctive therapy to support lung protective ventilation or maintain spontaneous breathing in hypercapnic respiratory failure. Low-flow ECCO<sub>2</sub>R is less invasive compared to higher flow systems, while potentially compromising efficiency and membrane lifetime. To counteract this shortcoming, a high-longevity system has recently been developed. Our hypotheses were that the novel membrane system provides runtimes up to 120 h, and CO<sub>2</sub> removal remains constant throughout membrane system lifetime. <b><i>Methods:</i></b> Seventy patients with pH ≤ 7.25 and/or PaCO<sub>2</sub> ≥9 kPa exceeding lung protective ventilation limits, or experiencing respiratory exhaustion during spontaneous breathing, were treated with the high-longevity ProLUNG system or in a control group using the original gas exchanger. Treatment parameters, gas exchanger runtime, and sweep-gas VCO<sub>2</sub> were recorded across 9,806 treatment-hours and retrospectively analyzed. <b><i>Results:</i></b> 25/33 and 23/37 patients were mechanically ventilated as opposed to awake spontaneously breathing in both groups. The high-longevity system increased gas exchanger runtime from 29 ± 16 to 48 ± 36 h in ventilated and from 22 ± 14 to 31 ± 31 h in awake patients (<i>p</i> < 0.0001), with longer runtime in the former (<i>p</i> < 0.01). VCO<sub>2</sub> remained constant at 86 ± 34 mL/min (<i>p</i> = 0.11). Overall, PaCO<sub>2</sub> decreased from 9.1 ± 2.0 to 7.9 ± 1.9 kPa within 1 h (<i>p</i> < 0.001). Tidal volume could be maintained at 5.4 ± 1.8 versus 5.7 ± 2.2 mL/kg at 120 h (<i>p</i> = 0.60), and peak airway pressure could be reduced from 31.1 ± 5.1 to 27.5 ± 6.8 mbar (<i>p</i> < 0.01). <b><i>Conclusion:</i></b> Using a high-longevity gas exchanger system, membrane lifetime in low-flow ECCO<sub>2</sub>R could be extended in comparison to previous systems but remained below 120 h, especially in spontaneously breathing patients. Extracorporeal VCO<sub>2</sub> remained constant throughout gas exchanger system runtime and was consistent with removal of approximately 50% of expected CO<sub>2</sub> production, enabling lung protective ventilation despite hypercapnic respiratory failure.
Collapse
|
8
|
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] [What about the content of this article? (0)] [Affiliation(s)] [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.
Collapse
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
| |
Collapse
|
9
|
Montomoli J, Romeo L, Moccia S, Bernardini M, Migliorelli L, Berardini D, Donati A, Carsetti A, Bocci MG, Wendel Garcia PD, Fumeaux T, Guerci P, Schüpbach RA, Ince C, Frontoni E, Hilty MP, Vizmanos-Lamotte G, Tschoellitsch T, Meier J, Aguirre-Bermeo H, Apolo J, Martínez A, Jurkolow G, Delahaye G, Novy E, Losser MR, Wengenmayer T, Rilinger J, Staudacher DL, David S, Welte T, Stahl K, Pavlos” “A, Aslanidis T, Korsos A, Babik B, Nikandish R, Rezoagli E, Giacomini M, Nova A, Fogagnolo A, Spadaro S, Ceriani R, Murrone M, Wu MA, Cogliati C, Colombo R, Catena E, Turrini F, Simonini MS, Fabbri S, Potalivo A, Facondini F, Gangitano G, Perin T, Grazia Bocci M, Antonelli M, Gommers D, Rodríguez-García R, Gámez-Zapata J, Taboada-Fraga X, Castro P, Tellez A, Lander-Azcona A, Escós-Orta J, Martín-Delgado MC, Algaba-Calderon A, Franch-Llasat D, Roche-Campo F, Lozano-Gómez H, Zalba-Etayo B, Michot MP, Klarer A, Ensner R, Schott P, Urech S, Zellweger N, Merki L, Lambert A, Laube M, Jeitziner MM, Jenni-Moser B, Wiegand J, Yuen B, Lienhardt-Nobbe B, Westphalen A, Salomon P, Drvaric I, Hillgaertner F, Sieber M, Dullenkopf A, Petersen L, Chau I, Ksouri H, Sridharan GO, Cereghetti S, Boroli F, Pugin J, Grazioli S, Rimensberger PC, Bürkle C, Marrel J, Brenni M, Fleisch I, Lavanchy J, Perez MH, Ramelet AS, Weber AB, Gerecke P, Christ A, Ceruti S, Glotta A, Marquardt K, Shaikh K, Hübner T, Neff T, Redecker H, Moret-Bochatay M, Bentrup FZ, Studhalter M, Stephan M, Brem J, Gehring N, Selz D, Naon D, Kleger GR, Pietsch U, Filipovic M, Ristic A, Sepulcri M, Heise A, Franchitti Laurent M, Laurent JC, Wendel Garcia PD, Schuepbach R, Heuberger D, Bühler P, Brugger S, Fodor P, Locher P, Camen G, Gaspert T, Jovic M, Haberthuer C, Lussman RF, Colak E. Machine learning using the extreme gradient boosting (XGBoost) algorithm predicts 5-day delta of SOFA score at ICU admission in COVID-19 patients. J Intensive Med 2021; 1:110-116. [PMID: 36785563 PMCID: PMC8531027 DOI: 10.1016/j.jointm.2021.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/20/2021] [Accepted: 09/06/2021] [Indexed: 02/08/2023]
Abstract
Background Accurate risk stratification of critically ill patients with coronavirus disease 2019 (COVID-19) is essential for optimizing resource allocation, delivering targeted interventions, and maximizing patient survival probability. Machine learning (ML) techniques are attracting increased interest for the development of prediction models as they excel in the analysis of complex signals in data-rich environments such as critical care. Methods We retrieved data on patients with COVID-19 admitted to an intensive care unit (ICU) between March and October 2020 from the RIsk Stratification in COVID-19 patients in the Intensive Care Unit (RISC-19-ICU) registry. We applied the Extreme Gradient Boosting (XGBoost) algorithm to the data to predict as a binary outcome the increase or decrease in patients' Sequential Organ Failure Assessment (SOFA) score on day 5 after ICU admission. The model was iteratively cross-validated in different subsets of the study cohort. Results The final study population consisted of 675 patients. The XGBoost model correctly predicted a decrease in SOFA score in 320/385 (83%) critically ill COVID-19 patients, and an increase in the score in 210/290 (72%) patients. The area under the mean receiver operating characteristic curve for XGBoost was significantly higher than that for the logistic regression model (0.86 vs. 0.69, P < 0.01 [paired t-test with 95% confidence interval]). Conclusions The XGBoost model predicted the change in SOFA score in critically ill COVID-19 patients admitted to the ICU and can guide clinical decision support systems (CDSSs) aimed at optimizing available resources.
Collapse
Affiliation(s)
- Jonathan Montomoli
- Department of Anaesthesia and Intensive Care, Infermi Hospital, AUSL della Romagna, Rimini 47923, Italy
| | - Luca Romeo
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Sara Moccia
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy,The BioRobotics Institute and Department of Excellence in Robotics and AI, Scuola Superiore Sant'Anna, Pisa 56127, Italy
| | - Michele Bernardini
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Lucia Migliorelli
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Daniele Berardini
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Abele Donati
- Anesthesia and Intensive Care Unit, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona 60126, Italy,Department of Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60126, Italy
| | - Andrea Carsetti
- Anesthesia and Intensive Care Unit, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona 60126, Italy,Department of Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60126, Italy
| | - Maria Grazia Bocci
- Department of Anaesthesia and Intensive Care, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome 00168, Italy
| | | | - Thierry Fumeaux
- Swiss Society of Intensive Care Medicine, Basel 4001, Switzerland
| | - Philippe Guerci
- Department of Anesthesiology and Critical Care Medicine, University Hospital of Nancy, Nancy 54511, France
| | - Reto Andreas Schüpbach
- Institute of Intensive Care Medicine, University Hospital of Zurich, Zurich 8091, Switzerland
| | - Can Ince
- Department of Intensive Care Erasmus MC, University Medical Center Rotterdam, Rotterdam, 3015 GD, Netherlands,Corresponding author: Erasmus MC, University Medical Center, Dr. Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands.
| | - Emanuele Frontoni
- Department of Information Engineering, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Zurich 8091, Switzerland
| | - RISC-19-ICU InvestigatorsAlfaro-FariasMarioMDVizmanos-LamotteGerardoMD, PhDTschoellitschThomasMDMeierJensMDAguirre-BermeoHernánMD, PhDApoloJaninaBScMartínezAlbertoMDJurkolowGeoffreyMDDelahayeGauthierMDNovyEmmanuelMDLosserMarie-ReineMD, PhDWengenmayerTobiasMDRilingerJonathanMDStaudacherDawid L.MDDavidSaschaMDWelteTobiasMDStahlKlausMDPavlos”“AgiosAslanidisTheodorosMD, PhDKorsosAnitaMDBabikBarnaMD, PhDNikandishRezaMDRezoagliEmanueleMD, PhDGiacominiMatteoMDNovaAliceMDFogagnoloAlbertoMDSpadaroSavinoMD, PhDCerianiRobertoMDMurroneMartinaMDWuMaddalena A.MDCogliatiChiaraMDColomboRiccardoMDCatenaEmanueleMDTurriniFabrizioMD, MScSimoniniMaria SoleMDFabbriSilviaMDPotalivoAntonellaMDFacondiniFrancescaMDGangitanoGianfilippoMDPerinTizianaMDGrazia BocciMariaMDAntonelliMassimoMDGommersDiederikMD, PhDRodríguez-GarcíaRaquelMDGámez-ZapataJorgeMDTaboada-FragaXianaMDCastroPedroMDTellezAdrianMDLander-AzconaArantxaMDEscós-OrtaJesúsMDMartín-DelgadoMaria C.MDAlgaba-CalderonAngelaMDFranch-LlasatDiegoMDRoche-CampoFerranMD, PhDLozano-GómezHerminiaMDZalba-EtayoBegoñaMD, PhDMichotMarc P.MDKlarerAlexanderEnsnerRolfMDSchottPeterMDUrechSeverinMDZellwegerNuriaMerkiLukasMDLambertAdrianaMDLaubeMarcusMDJeitzinerMarie M.RN, PhDJenni-MoserBeatriceRN, MScWiegandJanMDYuenBerndMDLienhardt-NobbeBarbaraWestphalenAndreaMDSalomonPetraMDDrvaricIrisMDHillgaertnerFrankMDSieberMarianneDullenkopfAlexanderMDPetersenLinaMDChauIvanMDKsouriHatemMD, PhDSridharanGovind OliverMDCereghettiSaraMDBoroliFilippoMDPuginJeromeMD, PhDGrazioliSergeMDRimensbergerPeter C.MDBürkleChristianMDMarrelJulienMDBrenniMirkoMDFleischIsabelleMDLavanchyJeromeMDPerezMarie-HeleneMDRameletAnne-SylvieMDWeberAnja BaltussenMDGereckePeterMDChristAndreasMDCerutiSamueleMDGlottaAndreaMDMarquardtKatharinaMDShaikhKarimMDHübnerTobiasMDNeffThomasMDRedeckerHermannMDMoret-BochatayMalloryMDBentrupFriederikeMeyer zuMD, MBAStudhalterMichaelMDStephanMichaelMDBremJanMDGehringNadineMDSelzDanielaMDNaonDidierMDKlegerGian-RetoMDPietschUrsMDFilipovicMiodragMDRisticAnetteMDSepulcriMichaelMDHeiseAntjeMDFranchitti LaurentMarileneMDLaurentJean-ChristopheMDWendel GarciaPedro D.MScSchuepbachRetoMDHeubergerDorotheaPhDBühlerPhilippMDBruggerSilvioMD, PhDFodorPatriciaMDLocherPascalMDCamenGiovanniMDGaspertTomislavMDJovicMarijaMDHaberthuerChristophMDLussmanRoger F.MDColakElifMD
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Wendel Garcia PD, Hilty MP, Held U, Kleinert EM, Maggiorini M. Cytokine adsorption in severe, refractory septic shock. Intensive Care Med 2021; 47:1334-1336. [PMID: 34471938 PMCID: PMC8409473 DOI: 10.1007/s00134-021-06512-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/17/2021] [Indexed: 11/26/2022]
Affiliation(s)
- Pedro David Wendel Garcia
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Ulrike Held
- Department of Biostatistics and Epidemiology, Biostatistics and Prevention Institute, University of Zürich, Zurich, Switzerland
| | - Eva-Maria Kleinert
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Marco Maggiorini
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
| |
Collapse
|
11
|
Hilty MP, Moser A, David S, Wendel Garcia PD, Capaldo G, Keiser S, Fumeaux T, Guerci P, Montomoli J, Van Boeckel TP, Jeitziner MM, Que YA, Jakob S, Schüpbach RA, Risc-Icu Investigators For Switzerland. Near real-time observation reveals increased prevalence of young patients in the ICU during the emerging third SARS-CoV-2 wave in Switzerland. Swiss Med Wkly 2021; 151:Swiss Med Wkly. 2021;151:w20553. [PMID: 34291810 DOI: 10.4414/smw.2021.20553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
AIMS OF THE STUDY During the ongoing COVID-19 pandemic, the launch of a large-scale vaccination campaign and virus mutations have hinted at possible changes in transmissibility and the virulence affecting disease progression up to critical illness, and carry potential for future vaccination failure. To monitor disease development over time with respect to critically ill COVID-19 patients, we report near real-time prospective observational data from the RISC-19-ICU registry that indicate changed characteristics of critically ill patients admitted to Swiss intensive care units (ICUs) at the onset of a third pandemic wave. METHODS 1829 of 3344 critically ill COVID-19 patients enrolled in the international RISC-19-ICU registry as of 31 May 2021 were treated in Switzerland and were included in the present study. Of these, 1690 patients were admitted to the ICU before 1 February 2021 and were compared with 139 patients admitted during the emerging third pandemic wave RESULTS: Third wave patients were a mean of 5.2 years (95% confidence interval [CI] 3.2–7.1) younger (median 66.0 years, interquartile range [IQR] 57.0–73.0 vs 62.0 years, IQR 54.5–68.0; p <0.0001) and had a higher body mass index than patients admitted in the previous pandemic period. They presented with lower SAPS II and APACHE II scores, less need for circulatory support and lower white blood cell counts at ICU admission. P/F ratio was similar, but a 14% increase in ventilatory ratio was observed over time (p = 0.03) CONCLUSION: Near real-time registry data show that the latest COVID-19 patients admitted to ICUs in Switzerland at the onset of the third wave were on average 5 years younger, had a higher body mass index, and presented with lower physiological risk scores but a trend towards more severe lung failure. These differences may primarily be related to the ongoing nationwide vaccination campaign, but the possibility that changes in virus-host interactions may be a co-factor in the age shift and change in disease characteristics is cause for concern, and should be taken into account in the public health and vaccination strategy during the ongoing pandemic. (ClinicalTrials.gov Identifier: NCT04357275).
Collapse
Affiliation(s)
- Matthias Peter Hilty
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | | | - Sascha David
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | | | - Giuliana Capaldo
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | - Stefanie Keiser
- Institute of Intensive Care Medicine, University Hospital of Zurich, Switzerland
| | - Thierry Fumeaux
- Swiss Society of Intensive Care Medicine, Basel, Switzerland
| | - Philippe Guerci
- Department of Anaesthesiology and Critical Care Medicine, University Hospital of Nancy, France
| | - Jonathan Montomoli
- Department of Intensive Care Medicine, Erasmus Medical Centre, Rotterdam, Netherlands
| | | | - Marie-Madlen Jeitziner
- Department of Intensive Care Medicine, Bern University Hospital, University of Bern, Switzerland
| | - Yok-Ai Que
- Department of Intensive Care Medicine, Bern University Hospital, University of Bern, Switzerland
| | - Stefan Jakob
- Department of Intensive Care Medicine, Bern University Hospital, University of Bern, Switzerland
| | | | | |
Collapse
|
12
|
Wendel Garcia PD, Fumeaux T, Guerci P, Heuberger DM, Montomoli J, Roche-Campo F, Schuepbach RA, Hilty MP. Prognostic factors associated with mortality risk and disease progression in 639 critically ill patients with COVID-19 in Europe: Initial report of the international RISC-19-ICU prospective observational cohort. EClinicalMedicine 2020; 25:100449. [PMID: 32838231 PMCID: PMC7338015 DOI: 10.1016/j.eclinm.2020.100449] [Citation(s) in RCA: 118] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/14/2020] [Accepted: 06/18/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Coronavirus disease 2019 (COVID-19) is associated with a high disease burden with 10% of confirmed cases progressing towards critical illness. Nevertheless, the disease course and predictors of mortality in critically ill patients are poorly understood. METHODS Following the critical developments in ICUs in regions experiencing early inception of the pandemic, the European-based, international RIsk Stratification in COVID-19 patients in the Intensive Care Unit (RISC-19-ICU) registry was created to provide near real-time assessment of patients developing critical illness due to COVID-19. FINDINGS As of April 22, 2020, 639 critically ill patients with confirmed SARS-CoV-2 infection were included in the RISC-19-ICU registry. Of these, 398 had deceased or been discharged from the ICU. ICU-mortality was 24%, median length of stay 12 (IQR, 5-21) days. ARDS was diagnosed in 74%, with a minimum P/F-ratio of 110 (IQR, 80-148). Prone positioning, ECCO2R, or ECMO were applied in 57%. Off-label therapies were prescribed in 265 (67%) patients, and 89% of all bloodstream infections were observed in this subgroup (n = 66; RR=3·2, 95% CI [1·7-6·0]). While PCT and IL-6 levels remained similar in ICU survivors and non-survivors throughout the ICU stay (p = 0·35, 0·34), CRP, creatinine, troponin, d-dimer, lactate, neutrophil count, P/F-ratio diverged within the first seven days (p<0·01). On a multivariable Cox proportional-hazard regression model at admission, creatinine, d-dimer, lactate, potassium, P/F-ratio, alveolar-arterial gradient, and ischemic heart disease were independently associated with ICU-mortality. INTERPRETATION The European RISC-19-ICU cohort demonstrates a moderate mortality of 24% in critically ill patients with COVID-19. Despite high ARDS severity, mechanical ventilation incidence was low and associated with more rescue therapies. In contrast to risk factors in hospitalized patients reported in other studies, the main mortality predictors in these critically ill patients were markers of oxygenation deficit, renal and microvascular dysfunction, and coagulatory activation. Elevated risk of bloodstream infections underscores the need to exercise caution with off-label therapies.
Collapse
Affiliation(s)
- Pedro David Wendel Garcia
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, Zurich 8091, Switzerland
| | - Thierry Fumeaux
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Soins intensifs, Groupement Hospitalier de l'Ouest Lémanique - Hopital de Nyon, Nyon, Switzerland
| | - Philippe Guerci
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Department of Anesthesiology and Critical care Medicine, University Hospital of Nancy, France
| | - Dorothea Monika Heuberger
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, Zurich 8091, Switzerland
| | - Jonathan Montomoli
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Department of Intensive Care Medicine, Erasmus medical Center, Rotterdam, Netherlands
| | - Ferran Roche-Campo
- Servei de Medicina intensiva, Hospital Verge de la Cinta, Tortosa, Tarragona, Spain
| | - Reto Andreas Schuepbach
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, Zurich 8091, Switzerland
| | - Matthias Peter Hilty
- The RISC-19-ICU registry board, University of Zurich, Zurich, Switzerland
- Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, Zurich 8091, Switzerland
| |
Collapse
|
13
|
Guerci P, Ergin B, Kandil A, Ince Y, Heeman P, Hilty MP, Bakker J, Ince C. Resuscitation with PEGylated carboxyhemoglobin preserves renal cortical oxygenation and improves skeletal muscle microcirculatory flow during endotoxemia. Am J Physiol Renal Physiol 2020; 318:F1271-F1283. [PMID: 32281418 DOI: 10.1152/ajprenal.00513.2019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
PEGylated carboxyhemoglobin (PEGHbCO), which has carbon monoxide-releasing properties and plasma expansion and oxygen-carrying properties, may improve both skeletal microcirculatory flow and renal cortical microcirculatory Po2 (CµPo2) and, subsequently, limit endotoxemia-induced acute kidney injury. Anesthetized, ventilated Wistar albino rats (n = 44) underwent endotoxemic shock. CµPo2 was measured in exposed kidneys using a phosphorescence-quenching method. Rats were randomly assigned to the following five groups: 1) unresuscitated lipopolysaccharide (LPS), 2) LPS + Ringer's acetate (RA), 3) LPS + RA + 0.5 µg·kg·-1min-1 norepinephrine (NE), 4) LPS + RA + 320 mg/kg PEGHbCO, and 5) LPS + RA + PEGHbCO + NE. The total volume was 30 mL/kg in each group. A time control animal group was used. Skeletal muscle microcirculation was assessed by handheld intravital microscopy. Kidney immunohistochemistry and myeloperoxidase-stained leukocytes in glomerular and peritubular areas were analyzed. Endotoxemia-induced histological damage was assessed. Plasma levels of IL-6, heme oxygenase-1, malondialdehyde, and syndecan-1 were assessed by ELISA. CµPo2 was higher in the LPS + RA + PEGHbCO-resuscitated group, at 35 ± 6mmHg compared with 21 ± 12 mmHg for the LPS+RA group [mean difference: -13.53, 95% confidence interval: (-26.35; -0.7156), P = 0.035]. The number of nonflowing, intermittent, or sluggish capillaries was smaller in groups infused with PEGHbCO compared with RA alone (P < 0.05), while the number of normally perfused vessels was greater (P < 0.05). The addition of NE did not further improve CµPo2 or microcirculatory parameters. Endotoxemia-induced kidney immunohistochemistry and histological alterations were not mitigated by PEGHbCO 1 h after resuscitation. Renal leukocyte infiltration and plasma levels of biomarkers were similar across groups. PEGHbCO enhanced CµPo2 while restoring skeletal muscle microcirculatory flow in previously nonflowing capillaries. PEGHbCO should be further evaluated as a resuscitation fluid in mid- to long-term models of sepsis-induced acute kidney injury.
Collapse
Affiliation(s)
- Philippe Guerci
- Department of Translational Physiology, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Institut National de la Santé et de la Recherche Médicale U1116, University of Lorraine, Vandoeuvre-Les-Nancy, France.,Department of Anesthesiology and Critical Care Medicine, University Hospital of Nancy, Nancy, France
| | - Bülent Ergin
- Department of Translational Physiology, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Erasmus Medical Center, University Medical Center, Rotterdam, The Netherlands
| | - Aslı Kandil
- Department of Biology, Faculty of Science, University of Istanbul, Istanbul, Turkey
| | - Yasin Ince
- Department of Translational Physiology, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Erasmus Medical Center, University Medical Center, Rotterdam, The Netherlands
| | - Paul Heeman
- Department of Medical Technical Innovation & Development, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Matthias Peter Hilty
- Department of Translational Physiology, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Jan Bakker
- Department of Intensive Care Medicine, Erasmus Medical Center, University Medical Center, Rotterdam, The Netherlands.,Department of Pulmonology and Critical Care, Columbia University Medical Center, New York.,Department of Intensive Care, Pontifical Catholic University of Chile, Santiago, Chile
| | - Can Ince
- Department of Translational Physiology, Amsterdam University Medical Center Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Intensive Care Medicine, Erasmus Medical Center, University Medical Center, Rotterdam, The Netherlands
| |
Collapse
|
14
|
Hilty MP, Guerci P, Ince Y, Toraman F, Ince C. MicroTools enables automated quantification of capillary density and red blood cell velocity in handheld vital microscopy. Commun Biol 2019; 2:217. [PMID: 31240255 PMCID: PMC6584696 DOI: 10.1038/s42003-019-0473-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 05/21/2019] [Indexed: 12/27/2022] Open
Abstract
Direct assessment of capillary perfusion has been prioritized in hemodynamic management of critically ill patients in addition to optimizing blood flow on the global scale. Sublingual handheld vital microscopy has enabled online acquisition of moving image sequences of the microcirculation, including the flow of individual red blood cells in the capillary network. However, due to inherent content complexity, manual image sequence analysis remained gold standard, introducing inter-observer variability and precluding real-time image analysis for clinical therapy guidance. Here we introduce an advanced computer vision algorithm for instantaneous analysis and quantification of morphometric and kinetic information related to capillary blood flow in the sublingual microcirculation. We evaluated this technique in a porcine model of septic shock and resuscitation and cardiac surgery patients. This development is of high clinical relevance because it enables implementation of point-of-care goal-directed resuscitation procedures based on correction of microcirculatory perfusion in critically ill and perioperative patients.
Collapse
Affiliation(s)
- Matthias Peter Hilty
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, 3015GD The Netherlands
| | - Philippe Guerci
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, 3015GD The Netherlands
| | - Yasin Ince
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, 3015GD The Netherlands
| | - Fevzi Toraman
- Department of Anesthesiology and Reanimation, Acıbadem Mehmet Ali Aydınlar University School of Medicine, Istanbul, 34752 Turkey
| | - Can Ince
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, 3015GD The Netherlands
| |
Collapse
|
15
|
Hilty MP, Merz TM, Hefti U, Ince C, Maggiorini M, Pichler Hefti J. Recruitment of non-perfused sublingual capillaries increases microcirculatory oxygen extraction capacity throughout ascent to 7126 m. J Physiol 2019; 597:2623-2638. [PMID: 30843200 DOI: 10.1113/jp277590] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 03/05/2019] [Indexed: 01/23/2023] Open
Abstract
KEY POINTS A physiological response to increase microcirculatory oxygen extraction capacity at high altitude is to recruit capillaries. In the present study, we report that high altitude-induced sublingual capillary recruitment is an intrinsic mechanism of the sublingual microcirculation that is independent of changes in cardiac output, arterial blood pressure or systemic vascular hindrance. Using a topical nitroglycerin challenge to the sublingual microcirculation, we show that high altitude-related capillary recruitment is a functional response of the sublingual microcirculation as opposed to an anatomical response associated with angiogenesis. The concurrent presence of a low capillary density and high microvascular reactivity to topical nitroglycerin at sea level was found to be associated with a failure to reach the summit, whereas the presence of a high baseline capillary density with the ability to further increase maximum recruitable capillary density upon ascent to an extreme altitude was associated with summit success. ABSTRACT A high altitude (HA) stay is associated with an increase in sublingual capillary total vessel density (TVD), suggesting microvascular recruitment. We hypothesized that microvascular recruitment occurs independent of cardiac output changes, that it relies on haemodynamic changes within the microcirculation as opposed to structural changes and that microcirculatory function is related to individual performance at HA. In 41 healthy subjects, sublingual handheld vital microscopy and echocardiography were performed at sea level (SL), as well as at 6022 m (C2) and 7042 m (C3), during ascent to 7126 m within 21 days. Sublingual topical nitroglycerin was applied to measure microvascular reactivity and maximum recruitable TVD (TVDNG ). HA exposure decreased resting cardiac output, whereas TVD (mean ± SD) increased from 18.81 ± 3.92 to 20.92 ± 3.66 and 21.25 ± 2.27 mm mm-2 (P < 0.01). The difference between TVD and TVDNG was 2.28 ± 4.59 mm mm-2 at SL (P < 0.01) but remained undetectable at HA. Maximal TVDNG was observed at C3. Those who reached the summit (n = 15) demonstrated higher TVD at SL (P < 0.01), comparable to TVDNG in non-summiters (n = 21) at SL and in both groups at C2. Recruitment of sublingual capillary TVD to increase microcirculatory oxygen extraction capacity at HA was found to be an intrinsic mechanism of the microcirculation independent of cardiac output changes. Microvascular reactivity to topical nitroglycerin demonstrated that HA-related capillary recruitment is a functional response as opposed to a structural change. The performance of the vascular microcirculation needed to reach the summit was found to be associated with a higher TVD at SL and the ability to further increase TVDNG upon ascent to extreme altitude.
Collapse
Affiliation(s)
- Matthias Peter Hilty
- Intensive Care Unit, University Hospital of Zurich, Zurich, Switzerland.,Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Tobias Michael Merz
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Cardiovascular Intensive Care Unit, Auckland City Hospital, Auckland, New Zealand
| | - Urs Hefti
- Swiss Sportclinic, Bern, Switzerland
| | - Can Ince
- Department of Intensive Care, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Marco Maggiorini
- Intensive Care Unit, University Hospital of Zurich, Zurich, Switzerland
| | - Jacqueline Pichler Hefti
- Department of Pulmonary Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| |
Collapse
|
16
|
von Wolff M, Nakas CT, Tobler M, Merz TM, Hilty MP, Veldhuis JD, Huber AR, Pichler Hefti J. Adrenal, thyroid and gonadal axes are affected at high altitude. Endocr Connect 2018; 7:1081-1089. [PMID: 30352395 PMCID: PMC6198189 DOI: 10.1530/ec-18-0242] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 08/29/2018] [Indexed: 11/08/2022]
Abstract
Humans cannot live at very high altitude for reasons, which are not completely understood. Since these reasons are not restricted to cardiorespiratory changes alone, changes in the endocrine system might also be involved. Therefore, hormonal changes during prolonged hypobaric hypoxia were comprehensively assessed to determine effects of altitude and hypoxia on stress, thyroid and gonadal hypothalamus-pituitary hormone axes. Twenty-one male and 19 female participants were examined repetitively during a high-altitude expedition. Cortisol, prolactin, thyroid-stimulating hormone (TSH), fT4 and fT3 and in males follicle-stimulating hormone (FSH), luteinizing hormone (LH) and total testosterone were analysed as well as parameters of hypoxemia, such as SaO2 and paO2 at 550 m (baseline) (n = 40), during ascent at 4844 m (n = 38), 6022 m (n = 31) and 7050 m (n = 13), at 4844 m (n = 29) after acclimatization and after the expedition (n = 38). Correlation analysis of hormone concentrations with oxygen parameters and with altitude revealed statistical association in most cases only with altitude. Adrenal, thyroid and gonadal axes were affected by increasing altitude. Adrenal axis and prolactin were first supressed at 4844 m and then activated with increasing altitude; thyroid and gonadal axes were directly activated or suppressed respectively with increasing altitude. Acclimatisation at 4844 m led to normalization of adrenal and gonadal but not of thyroid axes. In conclusion, acclimatization partly leads to a normalization of the adrenal, thyroid and gonadal axes at around 5000 m. However, at higher altitude, endocrine dysregulation is pronounced and might contribute to the physical degradation found at high altitude.
Collapse
Affiliation(s)
- M von Wolff
- Division of Gynaecological Endocrinology and Reproductive MedicineUniversity Women’s Hospital, Bern University Hospital, University of Bern, Bern, Switzerland
- Correspondence should be addressed to M von Wolff:
| | - C T Nakas
- University Institute of Clinical ChemistryInselspital, Bern University Hospital, University of Bern, Bern, Switzerland
- Laboratory of BiometryUniversity of Thessaly, Volos, Greece
| | - M Tobler
- Division of Gynaecological Endocrinology and Reproductive MedicineUniversity Women’s Hospital, Bern University Hospital, University of Bern, Bern, Switzerland
- Division of PneumologyInselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - T M Merz
- Division of Intensive Care MedicineInselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - M P Hilty
- Intensive Care UnitUniversity Hospital, Zurich, Switzerland
| | - J D Veldhuis
- Endocrine Research UnitDepartment of Internal Medicine, Mayo School of Graduate Medical Education, Centre for Translational Science Activities, Mayo Clinic, Rochester, New York, USA
| | - A R Huber
- Centre for Laboratory MedicineCantonal Hospital, Aarau, Switzerland
| | - J Pichler Hefti
- Division of PneumologyInselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| |
Collapse
|
17
|
Stark D, Stiller R, Xie M, Weber D, Maggiorini M, Hilty MP. Preserving fertility in an unconscious patient with Goodpasture syndrome-medicolegal and ethical aspects. J Intensive Care 2018; 6:40. [PMID: 30062013 PMCID: PMC6056934 DOI: 10.1186/s40560-018-0311-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 07/10/2018] [Indexed: 11/10/2022] Open
Abstract
Background Every day in the ICU, legal issues arise while treating sedated, unconscious, and legally incapacitated patients. Whenever a life-saving treatment cannot be discussed in a timely manner with an unconscious patient, doctors are required by law to act according to the substituted judgment standard. However, if it is not survival that is at stake, but conservation of reproduction and the potential side effects are significant, the decision-making process becomes much more difficult. Legal issues associated with possible harm to the patient on the one hand and ethical issues with presumable benefit of the intervention on the other hand give rise to difficult decisions. Case presentation We present the case of a 24-year-old patient with Goodpasture syndrome. Because of rapid aggravation of kidney function and alveolar hemorrhage-the latter requiring an urgent initiation of mechanical ventilation-therapy with steroids, plasmapheresis, and cyclophosphamide was immediately required. Knowledge of the negative impact on fertility brought up the question about sperm cryopreservation. According to the substituted judgment standard, together with the mother of the patient and based on interdisciplinary evaluation of the situation with specialists from the reproductive endocrinology and urology department, the decision for a testicular sperm extraction in the absence of the possibility to obtain the patient's informed consent was made. Immediate chemotherapy was initiated and continued after the procedure. The patient recovered from the acute illness and was informed retrospectively about the testicular sperm extraction, which he received extremely positively. Conclusion Our aim is to highlight the legal objectives and ethical aspects of a non-lifesaving but fertility-preserving intervention in an unconscious patient. The need for decision-making in this kind of situation is rare and therefore challenging. The present case may serve to encourage and guide other doctors in similar situations.
Collapse
Affiliation(s)
- Doreen Stark
- 1Medical Intensive Care Unit, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | - Ruth Stiller
- 2Department of Reproduction Endocrinology, University Hospital of Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland
| | - Min Xie
- 2Department of Reproduction Endocrinology, University Hospital of Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland
| | - Damian Weber
- 3Department of Urology, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | - Marco Maggiorini
- 1Medical Intensive Care Unit, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| | - Matthias Peter Hilty
- 1Medical Intensive Care Unit, University Hospital of Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
| |
Collapse
|
18
|
Hilty MP, Pichler J, Ergin B, Hefti U, Merz TM, Ince C, Maggiorini M. Assessment of endothelial cell function and physiological microcirculatory reserve by video microscopy using a topical acetylcholine and nitroglycerin challenge. Intensive Care Med Exp 2017; 5:26. [PMID: 28523563 PMCID: PMC5436993 DOI: 10.1186/s40635-017-0139-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 05/09/2017] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Assessment of the microcirculation is a promising target for the hemodynamic management of critically ill patients. However, just as the sole reliance on macrocirculatory parameters, single static parameters of the microcirculation may not represent a sufficient guide. Our hypothesis was that by serial topical application of acetylcholine (ACH) and nitroglycerin (NG), the sublingual microcirculation can be challenged to determine its endothelial cell-dependent and smooth muscle-dependent physiological reserve capacity. METHODS In 41 healthy subjects, sublingual capillary microscopy was performed before and after topical application of ACH and NG. Total vessel density (TVD) was assessed in parallel using manual computer-assisted image analysis as well as a fully automated analysis pathway utilizing a newly developed computer algorithm. Flow velocity was assessed using space-time diagrams of the venules as well as the algorithm-based calculation of an average perfused speed indicator (APSI). RESULTS No change in all measured parameters was detected after sublingual topical application of ACH. Sublingual topical application of NG however led to an increase in TVD, space-time diagram-derived venular flow velocity and APSI. No difference was detected in heart rate, blood pressure, and cardiac output as measured by echocardiography, as well as in plasma nitric oxide metabolite content before and after the topical application of ACH and NG. CONCLUSIONS In healthy subjects, the sublingual microcirculatory physiological reserve can be assessed non-invasively by topical application of nitroglycerin without affecting systemic circulation.
Collapse
Affiliation(s)
- Matthias Peter Hilty
- Medical Intensive Care Unit, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
| | - Jacqueline Pichler
- Department of Pulmonary Medicine, Inselspital, Bern University Hospital, Bern, Switzerland.,Department of Intensive Care Medicine, Inselspital, Bern University Hospital, Bern, Switzerland
| | - Bulent Ergin
- Department of Translational Physiology, Academic Medical Center, Amsterdam, The Netherlands
| | - Urs Hefti
- Swiss Sportclinic, Bern, Switzerland
| | - Tobias Michael Merz
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, Bern, Switzerland
| | - Can Ince
- Department of Translational Physiology, Academic Medical Center, Amsterdam, The Netherlands
| | - Marco Maggiorini
- Medical Intensive Care Unit, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| |
Collapse
|
19
|
Keiser S, Meinild-Lundby AK, Steiner T, Trösch S, Rauber S, Krafft A, Burkhardt T, Hilty MP, Siebenmann C, Wehrlin JP, Lundby C. Detection of blood volumes and haemoglobin mass by means of CO re-breathing and indocyanine green and sodium fluorescein injections. Scand J Clin Lab Invest 2017; 77:164-174. [PMID: 28276723 DOI: 10.1080/00365513.2016.1271908] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The main aim of the present study was to quantify the magnitude of differences introduced when estimating a given blood volume compartment (e.g. plasma volume) through the direct determination of another compartment (e.g. red cell volume) by multiplication of venous haematocrit and/or haemoglobin concentration. However, since whole body haematocrit is higher than venous haematocrit such an approach might comprise certain errors. To test this experimentally, four different methods for detecting blood volumes and haemoglobin mass (Hbmass) were compared, namely the carbon monoxide (CO) re-breathing (for Hbmass), the indocyanine green (ICG; for plasma volume [PV]) and the sodium fluorescein (SoF; for red blood cell volume [RBCV]) methods. No difference between ICG and CO re-breathing derived PV could be established when a whole body/venous haematocrit correction factor of 0.91 was applied (p = 0.11, r = 0.43, mean difference -340 ± 612 mL). In contrast, when comparing RBCV derived by the CO re-breathing and the SoF method, the SoF method revealed lower RBCV values as compared to the CO re-breathing method (p < 0.05, r = 0.95, mean difference -728 ± 184 mL). However, compared to the ICG and the SoF methods, the typical error (%TE) and hence reliability of the CO re-breathing method was lower for all measured parameters. Therefore, estimating blood volume compartments by the direct assessment of another compartment can be considered a suitable approach. The CO re-breathing method proved accurate in determining the induced phlebotomy and is at the same time judged easier to perform than any of the other methods.
Collapse
Affiliation(s)
- Stefanie Keiser
- a Zurich Center for Integrative Human Physiology , Institute of Physiology, University of Zurich , Zurich , Switzerland
| | - Anne-Kristine Meinild-Lundby
- a Zurich Center for Integrative Human Physiology , Institute of Physiology, University of Zurich , Zurich , Switzerland
| | - Thomas Steiner
- b Swiss Federal Institute of Sports , Magglingen , Switzerland
| | - Severin Trösch
- b Swiss Federal Institute of Sports , Magglingen , Switzerland
| | - Sven Rauber
- a Zurich Center for Integrative Human Physiology , Institute of Physiology, University of Zurich , Zurich , Switzerland
| | - Alexander Krafft
- c Foeto-Maternal Haematology Group, Department of Obstetrics , University Hospital of Zurich , Zurich , Switzerland
| | - Tilo Burkhardt
- c Foeto-Maternal Haematology Group, Department of Obstetrics , University Hospital of Zurich , Zurich , Switzerland
| | | | - Christoph Siebenmann
- e Department of Environmental Physiology, School of Technology and Health , Royal Institute of Technology , Solna , Sweden
| | | | - Carsten Lundby
- a Zurich Center for Integrative Human Physiology , Institute of Physiology, University of Zurich , Zurich , Switzerland
| |
Collapse
|
20
|
Dandanell S, Oberholzer L, Keiser S, Andersen AB, Haider T, Hilty MP, Meinild-Lundby AK, Lundby C. Effect of alterations in blood volume with bed rest on glucose tolerance. J Appl Physiol (1985) 2016; 121:1098-1105. [PMID: 27633742 DOI: 10.1152/japplphysiol.00624.2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/12/2016] [Indexed: 11/22/2022] Open
Abstract
Bed rest leads to rapid impairments in glucose tolerance. Plasma volume and thus dilution space for glucose are also reduced with bed rest, but the potential influence on glucose tolerance has not been investigated. Accordingly, the aim was to investigate whether bed rest-induced impairments in glucose tolerance are related to a concomitant reduction in plasma volume. This hypothesis was tested mechanistically by restoring plasma volume with albumin infusion after bed rest and parallel determination of glucose tolerance. Fifteen healthy volunteers (age 24 ± 3 yr, body mass index 23 ± 2 kg/m2, maximal oxygen uptake 44 ± 8 ml·min-1·kg-1; means ± SD) completed 4 days of strict bed rest. Glucose tolerance [oral glucose tolerance test (OGTT)] and plasma and blood volumes (carbon monoxide rebreathing) were assessed before and after 3 days of bed rest. On the fourth day of bed rest, plasma volume was restored by means of an albumin infusion prior to an OGTT. Plasma volume was reduced by 9.9 ± 3.0% on bed rest day 3 and area under the curve for OGTT was augmented by 55 ± 67%. However, no association (R2 = 0.09, P = 0.33) between these simultaneously occurring responses was found. While normalization of plasma volume by matched albumin administration (408 ± 104 ml) transiently decreased (P < 0.05) resting plasma glucose concentration (5.0 ± 0.4 to 4.8 ± 0.3 mmol/l), this did not restore glucose tolerance. Bed rest-induced alterations in dilution space may influence resting glucose values but do not affect area under the curve for OGTT.
Collapse
Affiliation(s)
- S Dandanell
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| | - L Oberholzer
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| | - S Keiser
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| | - A B Andersen
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| | - T Haider
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| | - M P Hilty
- Intensive Care Unit, University Hospital of Zürich, Zurich, Switzerland
| | | | - C Lundby
- Institute of Physiology, University of Zürich, Zurich, Switzerland; and
| |
Collapse
|