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Östberg E, Larsson A, Wagner P, Eriksson S, Edmark L. Positive end-expiratory pressure and emergence preoxygenation after bariatric surgery: A randomised controlled trial on postoperative oxygenation. Eur J Anaesthesiol 2024:00003643-990000000-00222. [PMID: 39325031 DOI: 10.1097/eja.0000000000002071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2024]
Abstract
BACKGROUND Positive end-expiratory pressure (PEEP) is important to increase lung volume and counteract airway closure during anaesthesia, especially in obese patients. However, maintaining PEEP during emergence preoxygenation might increase postoperative atelectasis by allowing susceptible lung areas to be filled with highly absorbable oxygen that gets entrapped when small airways collapse due to the sudden loss of PEEP at extubation. OBJECTIVE This study aimed to test the hypothesis that withdrawing PEEP just before emergence preoxygenation would better maintain postoperative oxygenation. DESIGN Prospective, randomised controlled trial. SETTING Single centre secondary hospital in Sweden between December 2019 and January 2023. PATIENTS A total of 60 patients, with body mass index between 35 and 50 kg m-2, undergoing laparoscopic bariatric surgery. INTERVENTION Intraoperative ventilation was the same for all patients with a fixed PEEP of 12 or 14 cmH2O depending on body mass index. No recruitment manoeuvres were used. After surgery, patients were allocated to maintained PEEP or zero PEEP during emergence preoxygenation. MAIN OUTCOME MEASURES The primary outcome was change in oxygenation from before awakening to 45 min postoperatively as measured by estimated venous admixture calculated from arterial blood gases. RESULTS Both groups had impaired oxygenation postoperatively; in the group with PEEP maintained during awakening, estimated venous admixture increased by mean 9.1%, and for the group with zero PEEP during awakening, estimated venous admixture increased by mean 10.6%, difference -1.5% (95% confidence interval -4.6 to 1.7%), P = 0.354. Throughout anaesthesia, both groups exhibited low driving pressures and superior oxygenation compared with the awake state. CONCLUSIONS Withdrawing PEEP before emergence preoxygenation, did not alter early postoperative oxygenation in obese patients undergoing laparoscopic bariatric surgery. Intraoperative oxygenation was excellent despite using fixed PEEP and no recruitment manoeuvres, but deteriorated after extubation, indicating a need for future studies aimed at improving the emergence procedure. CLINICAL TRIAL NUMBER AND REGISTRY www.clinicaltrials.gov, NCT04150276. Registration date: 4 November 2019. Principal investigator: Erland Östberg.
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Affiliation(s)
- Erland Östberg
- From the Department of Anaesthesia and Intensive Care, and Centre for Clinical Research, Västmanland Hospital Västerås, Sweden; Department of Surgical Sciences, Uppsala University, Uppsala, Sweden (EÖ, AL, LE), Region Västmanland - Uppsala University, Centre for Clinical Research, Västmanland Hospital Västerås, Sweden (PW), and Department of Surgery and Centre for Clinical Research at Västmanland Hospital Västerås, Sweden; Department of Surgical Sciences, Uppsala University, Uppsala, Sweden (SE)
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Mato-Búa R, Prado-Rodríguez A, López-López D, Rama-Maceiras P, Molins-Gauna N, Álvarez-Refojo F. Intraoperative effects of an alveolar recruitment manoeuvre in patients undergoing laparoscopic colon surgery. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2024; 71:151-159. [PMID: 38452926 DOI: 10.1016/j.redare.2024.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
INTRODUCTION Pulmonary atelectasis is common in patients undergoing laparoscopic abdominal surgery under general anaesthesia, which increases the risk of perioperative respiratory complications. Alveolar recruitment manoeuvres (ARM) are used to open up the lung parenchyma with atelectasis, although the duration of their benefit has not been clearly established. The aim of this study was to determine the effectiveness of an ARM in laparoscopic colon surgery, the duration of response over time, and its haemodynamic impact. METHODS Twenty-five patients undergoing laparoscopic colon surgery were included. After anaesthetic induction and initiation of surgery with pneumoperitoneum, an ARM was performed, and then optimal PEEP determined. Respiratory mechanics and gas exchange variables, and haemodynamic parameters, were analysed before the manoeuvre and periodically over the following 90 min. RESULTS Three patients were excluded for surgical reasons. The alveolar arterial oxygen gradient went from 94.3 (62.3-117.8) mmHg before to 60.7 (29.6-91.0) mmHg after the manoeuvre (P < .05). This difference was maintained during the 90 min of the study. Dynamic compliance of the respiratory system went from 31.3 ml/cmH2O (26.1-39.2) before the manoeuvre to 46.1 ml/cmH2O (37.5-53.5) after the manoeuvre (P < .05). This difference was maintained for 60 min. No significant changes were identified in any of the haemodynamic variables studied. CONCLUSION In patients undergoing laparoscopic colon surgery, performing an intraoperative ARM improves the mechanics of the respiratory system and oxygenation, without associated haemodynamic compromise. The benefit of these manoeuvres lasts for at least one hour.
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Affiliation(s)
- R Mato-Búa
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain.
| | - A Prado-Rodríguez
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - D López-López
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - P Rama-Maceiras
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - N Molins-Gauna
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
| | - F Álvarez-Refojo
- Departamento de Anestesiología, Reanimación y Tratamiento del Dolor, Complexo Hospitalario Universitario de A Coruña, A Coruña, Galicia, Spain
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Frerichs I, Schädler D, Becher T. Setting positive end-expiratory pressure by using electrical impedance tomography. Curr Opin Crit Care 2024; 30:43-52. [PMID: 38085866 DOI: 10.1097/mcc.0000000000001117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
PURPOSE OF REVIEW This review presents the principles and possibilities of setting positive end-expiratory pressure (PEEP) using electrical impedance tomography (EIT). It summarizes the major findings of recent studies where EIT was applied to monitor the effects of PEEP on regional lung function and to guide the selection of individualized PEEP setting. RECENT FINDINGS The most frequent approach of utilizing EIT for the assessment of PEEP effects and the PEEP setting during the time period from January 2022 till June 2023 was based on the analysis of pixel tidal impedance variation, typically acquired during stepwise incremental and/or decremental PEEP variation. The most common EIT parameters were the fraction of ventilation in various regions of interest, global inhomogeneity index, center of ventilation, silent spaces, and regional compliance of the respiratory system. The studies focused mainly on the spatial and less on the temporal distribution of ventilation. Contrast-enhanced EIT was applied in a few studies for the estimation of ventilation/perfusion matching. SUMMARY The availability of commercial EIT devices resulted in an increase in clinical studies using this bedside imaging technology in neonatal, pediatric and adult critically ill patients. The clinical interest in EIT became evident but the potential of this method in clinical decision-making still needs to be fully exploited.
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Affiliation(s)
- Inéz Frerichs
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany
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Romero CS, Cortegiani A, Luedi MM. New insights in mechanical ventilation in the obese patients. J Clin Anesth 2024; 92:111268. [PMID: 37863748 DOI: 10.1016/j.jclinane.2023.111268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 09/17/2023] [Indexed: 10/22/2023]
Affiliation(s)
- Carolina S Romero
- Department of Anaesthesiology and Critical Care, Hospital General Universitario De, Valencia, Valencia, Spain; Research Methods Department, Universidad Europea de, Valencia, Valencia, Spain; Outcomes Research Consortium, Cleveland, OH, USA.
| | - Andrea Cortegiani
- Department of Surgical Oncological and Oral Science, University of Palermo. Department of Anesthesia Analgesia Intensive Care and Mergency, University Hospital Policlinico Paolo Giaccone, Palermo, Italy.
| | - Markus M Luedi
- Department of Anesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
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Boesing C, Schaefer L, Hammel M, Otto M, Blank S, Pelosi P, Rocco PRM, Luecke T, Krebs J. Individualized Positive End-expiratory Pressure Titration Strategies in Superobese Patients Undergoing Laparoscopic Surgery: Prospective and Nonrandomized Crossover Study. Anesthesiology 2023; 139:249-261. [PMID: 37224406 DOI: 10.1097/aln.0000000000004631] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BACKGROUND Superobesity and laparoscopic surgery promote negative end-expiratory transpulmonary pressure that causes atelectasis formation and impaired respiratory mechanics. The authors hypothesized that end-expiratory transpulmonary pressure differs between fixed and individualized positive end-expiratory pressure (PEEP) strategies and mediates their effects on respiratory mechanics, end-expiratory lung volume, gas exchange, and hemodynamic parameters in superobese patients. METHODS In this prospective, nonrandomized crossover study including 40 superobese patients (body mass index 57.3 ± 6.4 kg/m2) undergoing laparoscopic bariatric surgery, PEEP was set according to (1) a fixed level of 8 cm H2O (PEEPEmpirical), (2) the highest respiratory system compliance (PEEPCompliance), or (3) an end-expiratory transpulmonary pressure targeting 0 cm H2O (PEEPTranspul) at different surgical positioning. The primary endpoint was end-expiratory transpulmonary pressure at different surgical positioning; secondary endpoints were respiratory mechanics, end-expiratory lung volume, gas exchange, and hemodynamic parameters. RESULTS Individualized PEEPCompliance compared to fixed PEEPEmpirical resulted in higher PEEP (supine, 17.2 ± 2.4 vs. 8.0 ± 0.0 cm H2O; supine with pneumoperitoneum, 21.5 ± 2.5 vs. 8.0 ± 0.0 cm H2O; and beach chair with pneumoperitoneum; 15.8 ± 2.5 vs. 8.0 ± 0.0 cm H2O; P < 0.001 each) and less negative end-expiratory transpulmonary pressure (supine, -2.9 ± 2.0 vs. -10.6 ± 2.6 cm H2O; supine with pneumoperitoneum, -2.9 ± 2.0 vs. -14.1 ± 3.7 cm H2O; and beach chair with pneumoperitoneum, -2.8 ± 2.2 vs. -9.2 ± 3.7 cm H2O; P < 0.001 each). Titrated PEEP, end-expiratory transpulmonary pressure, and lung volume were lower with PEEPCompliance compared to PEEPTranspul (P < 0.001 each). Respiratory system and transpulmonary driving pressure and mechanical power normalized to respiratory system compliance were reduced using PEEPCompliance compared to PEEPTranspul. CONCLUSIONS In superobese patients undergoing laparoscopic surgery, individualized PEEPCompliance may provide a feasible compromise regarding end-expiratory transpulmonary pressures compared to PEEPEmpirical and PEEPTranspul, because PEEPCompliance with slightly negative end-expiratory transpulmonary pressures improved respiratory mechanics, lung volumes, and oxygenation while preserving cardiac output. EDITOR’S PERSPECTIVE
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Affiliation(s)
- Christoph Boesing
- Department of Anesthesiology and Critical Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Laura Schaefer
- Department of Anesthesiology and Critical Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Marvin Hammel
- Department of Anesthesiology and Critical Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Mirko Otto
- Department of Surgery, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Susanne Blank
- Department of Surgery, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Paolo Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genoa, Italy; Anesthesiology and Critical Care - San Martino Policlinico Hospital, IRCCS for Oncology and Neurosciences, Genoa, Italy
| | - Patricia R M Rocco
- Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Centro de Ciências da Saúde, Ilha do Fundao, Rio de Janeiro, Brazil
| | - Thomas Luecke
- Department of Anesthesiology and Critical Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
| | - Joerg Krebs
- Department of Anesthesiology and Critical Care Medicine, University Medical Center Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Mannheim, Germany; Theodor-Kutzer-Ufer 1-3, Mannheim, Germany
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Luo LF, Lin YM, Liu Y, Gao XH, Li CY, Zhang XQ, Wu JH, Chen ZY. Effect of individualized PEEP titration by ultrasonography on perioperative pulmonary protection and postoperative cognitive function in patients with chronic obstructive pulmonary disease. BMC Pulm Med 2023; 23:232. [PMID: 37380978 DOI: 10.1186/s12890-023-02471-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 05/06/2023] [Indexed: 06/30/2023] Open
Abstract
OBJECTIVE To evaluate the effect of the individualized positive end-expiratory pressure (PEEP) lung protection ventilation strategy by combining driving pressure (ΔP) and pulmonary ultrasound (LUS)-based titration on lung function and postoperative cognitive function in patients with chronic obstructive pulmonary disease (COPD) during laparoscopic surgery. METHODS A total of 108 patients with COPD undergoing laparoscopic gastrointestinal surgery under general anesthesia were included in this study. They were randomly divided into three groups (n = 36): traditional volume ventilation group (Group C), fixed PEEP 5 cmH2O group (Group P), and ΔP combined with LUS-based PEEP titration in the resuscitation room group (Group T). All three groups were given volume ventilation mode, I:E = 1:2; In group C, VT was 10 mL/kg and PEEP was 0 cmH2O; In groups P and T, VT was 6 mL/kg and PEEP was 5 cmH2O; After mechanical ventilation for 15 min in Group T, ΔP in combination with LUS was used to titrate PEEP. The oxygenation index (PaO2/FiO2), airway platform pressure (Pplat), dynamic lung compliance (Cdyn), Montreal Cognitive Assessment (MoCA), and venous interleukin-6(IL-6) were recorded at the corresponding time points, and the final PEEP value in Group T was recorded. RESULTS The final PEEP value of Group T was (6.4 ± 1.2) cmH2O; Compared with groups C and P: PaO2/FiO2 and Cdyn in Group T were significantly increased (P < 0.05) and value of IL-6 was significantly decreased (P < 0.05) at the corresponding time points. Compared with group C, the MoCA score on day 7 after surgery in Group T was significantly higher (P < 0.05). CONCLUSION Compared with the traditional ventilation strategy, the individualized ΔP combined with LUS-based PEEP titration in patients with COPD during the perioperative period of laparoscopic surgery can play a better role in lung protection and can improve postoperative cognitive function.
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Affiliation(s)
- Lai-Feng Luo
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
- Department of Anesthesiology, The Second Hospital of Sanming, Sanming City, 366000, Fujian Province, China
| | - Yu-Mei Lin
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
| | - Ying Liu
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
| | - Xiao-Hua Gao
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
| | - Chui-Yu Li
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
| | - Xiao-Qi Zhang
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China
| | - Jian-Hua Wu
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China.
| | - Zhi-Yuan Chen
- Department of Anesthesiology, the Second Affiliated Hospital of Fujian Medical University, No.950 of Donghai street, Fengze District, Quanzhou, 362000, China.
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Thoracic anaesthetic research: 90 years of sustained progress. Br J Anaesth 2023; 130:e30-e33. [PMID: 36470744 DOI: 10.1016/j.bja.2022.10.034] [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: 10/14/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 12/04/2022] Open
Abstract
Over the 90 years since the first description of one-lung ventilation, the practice of thoracic surgery and anaesthesia continues to develop. Minimally invasive surgical techniques are increasingly being used to minimise the surgical insult and facilitate improved outcomes. Challenging these outcomes, however, are parallel changes in patient characteristics with more older and sicker patients undergoing surgery. Thoracic anaesthesia as a speciality continues to respond to these challenges with evolution of practice and strong academic performance.
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