1
|
González-Pizarro P, Acosta CM, Alcaraz García-Tejedor G, Tusman G, Ferrando C, Ricci L, Natal ML, Suarez-Sipmann F. Clinical validation of the Air-Test for the non-invasive detection of perioperative atelectasis in children. Minerva Anestesiol 2024; 90:635-643. [PMID: 39021139 DOI: 10.23736/s0375-9393.24.17933-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
BACKGROUND The incidence of anesthesia-induced atelectasis in children is high and closely related to episodes of hypoxemia. The Air-Test is a simple maneuver to detect lung collapse. By a step-reduction in FiO2 to 0.21, a fall in pulse-oximetry hemoglobin saturation <97% unmasks the presence of collapse-related shunt in healthy lungs. The aim of this study was to validate the Air-Test as a diagnostic tool to detect perioperative atelectasis in children using lung ultrasound as a reference. METHODS We first assessed the Air-Test in a retrospective cohort of 88 anesthetized children (Retrospective study) followed by a prospective study performed in 72 children (45 postconceptional weeks to 16 years old) using a similar protocol (Validation study). We analyzed the performance of the Air-Test to detect atelectasis by an operating characteristic curve (ROC) analysis, using lung ultrasound consolidation score as reference. RESULTS Preoperative SpO2 was normal in both studies (retrospective 98.7±0.6%, validation 99.0±0.9%). The Air-Test, with a SpO2 cut point <97%, resulted positive in 67 patients in the retrospective study (SpO2 93.3±2.1%) and in 59 in the validation study (SpO2 94.9±1.8%); both P<0.0001. In the validation study, the Air-Test showed a sensitivity of 0.91 (95% CI 0.85-0.92), specificity of 1.00 (95% CI 0.84-1) and an area under the curve (AUC) of 0.98 (95% CI 0.97-1.00). AUC between both studies was similar (P=0.16). CONCLUSIONS The Air-Test is a noninvasive and accurate method to detect atelectasis in healthy anesthetized children. It can be used as a screening tool to individualize patients that can benefit from lung recruitment maneuvers.
Collapse
Affiliation(s)
- Patricio González-Pizarro
- Department of Pediatric Anesthesia and Critical Care, La Paz Children's University Hospital, Madrid, Spain -
- IdiPaz Research Institute, Madrid, Spain -
| | - Cecilia M Acosta
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | | | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | - Carlos Ferrando
- Department of Anesthesiology and Critical Care, Hospital Clínic of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Lila Ricci
- Department of Mathematics, Faculty of Exact Sciences, National University of Mar del Plata, Mar del Plata, Argentina
| | - Marcela L Natal
- Department of Mathematics, Faculty of Exact Sciences, National University of Mar del Plata, Mar del Plata, Argentina
| | - Fernando Suarez-Sipmann
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Department of Intensive Care Medicine, La Princesa University Hospital, Madrid, Spain
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| |
Collapse
|
2
|
Hennessey E, Bittner E, White P, Kovar A, Meuchel L. Intraoperative Ventilator Management of the Critically Ill Patient. Anesthesiol Clin 2023; 41:121-140. [PMID: 36871995 PMCID: PMC9985493 DOI: 10.1016/j.anclin.2022.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
Strategies for the intraoperative ventilator management of the critically ill patient focus on parameters used for lung protective ventilation with acute respiratory distress syndrome, preventing or limiting the deleterious effects of mechanical ventilation, and optimizing anesthetic and surgical conditions to limit postoperative pulmonary complications for patients at risk. Patient conditions such as obesity, sepsis, the need for laparoscopic surgery, or one-lung ventilation may benefit from intraoperative lung protective ventilation strategies. Anesthesiologists can use risk evaluation and prediction tools, monitor advanced physiologic targets, and incorporate new innovative monitoring techniques to develop an individualized approach for patients.
Collapse
Affiliation(s)
- Erin Hennessey
- Stanford University - School of Medicine Department of Anesthesiology, Perioperative and Pain Medicine, 300 Pasteur Drive, Room H3580, Stanford, CA 94305, USA.
| | - Edward Bittner
- Department of Anesthesia, Critical Care and Pain Medicine, Harvard Medical School, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Peggy White
- University of Florida College of Medicine, Department of Anesthesiology, 1500 SW Archer Road, PO Box 100254, Gainesville, FL 32610, USA
| | - Alan Kovar
- Oregon Health and Science University, 3161 SW Pavilion Loop, Portland, OR 97239, USA
| | - Lucas Meuchel
- Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
| |
Collapse
|
3
|
Di Bella C, Vicenti C, Araos J, Lacitignola L, Fracassi L, Stabile M, Grasso S, Crovace A, Staffieri F. Effects of two alveolar recruitment maneuvers in an “open-lung” approach during laparoscopy in dogs. Front Vet Sci 2022; 9:904673. [PMID: 36061108 PMCID: PMC9435385 DOI: 10.3389/fvets.2022.904673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 06/28/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives The aim of this study was to compare the effects of a sustained inflation alveolar recruiting maneuver (ARM) followed by 5 cmH2O of PEEP and a stepwise ARM, in dogs undergoing laparoscopic surgery. Materials and methods Twenty adult dogs were enrolled in this prospective randomized clinical study. Dogs were premedicated with methadone intramuscularly (IM); anesthesia was induced with propofol intravenously (IV) and maintained with inhaled isoflurane in pure oxygen. The baseline ventilatory setting (BVS) was as follows: tidal volume of 15 mL/kg, inspiratory pause of 25%, inspiratory to expiratory ratio of 1:2, and the respiratory rate to maintain the end-tidal carbon dioxide between 45 and 55 mmHg. 10 min after pneumoperitoneum, randomly, 10 dogs underwent sustained inflation ARM followed by 5 cmH2O of PEEP (ARMi), while 10 dogs underwent a stepwise recruitment maneuver followed by the setting of the “best PEEP” (ARMc). Gas exchange, respiratory system mechanics, and hemodynamic were evaluated before the pneumoperitoneum induction (BASE), 10 min after the pneumoperitoneum (PP), 10 min after the recruitment (ARM), and 10 min after the pneumoperitoneum resolution (PostPP). Statistical analysis was performed with the ANOVA test (p < 0.05). Results Static compliance decreased in both groups at PP (ARMc = 1.35 ± 0.21; ARMi = 1.16 ± 0.26 mL/cmH2O/kg) compared to BASE (ARMc = 1.78 ± 0.60; ARMi = 1.66 ± 0.66 mL/cmH2O/kg) and at ARM (ARMc = 1.71 ± 0.41; ARMi = 1.44 ± 0.84 mL/cmH2O/kg) and PostPP (ARMc = 1.75 ± 0.45; ARMi = 1.89 ± 0.59 mL/cmH2O/kg), and it was higher compared to PP and similar to BASE. The PaO2/FiO2, in both groups, was higher at ARM (ARMc = 455.11 ± 85.90; ARMi = 505.40 ± 31.70) and PostPP (ARMc = 521.30 ± 66.20; ARMi = 450.90 ± 70.60) compared to PP (ARMc = 369.53 ± 49.31; ARMi = 394.32 ± 37.72). Conclusion and clinical relevance The two ARMs improve lung function in dogs undergoing laparoscopic surgery similarly. Application of PEEP at the end of the ARMs prolonged the effects of the open-lung strategy.
Collapse
Affiliation(s)
- Caterina Di Bella
- School of Bioscience and Veterinary Medicine, University of Camerino, Camerino, Italy
| | - Caterina Vicenti
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Joaquin Araos
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Luca Lacitignola
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Laura Fracassi
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Marzia Stabile
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Salvatore Grasso
- Section of Anesthesia and Intensive Care, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Alberto Crovace
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
| | - Francesco Staffieri
- Section of Veterinary Clinics and Animal Production, Department of Emergency and Organ Transplantations, University of Bari, Bari, Italy
- *Correspondence: Francesco Staffieri
| |
Collapse
|
4
|
Granell-Gil M, Murcia-Anaya M, Sevilla S, Martínez-Plumed R, Biosca-Pérez E, Cózar-Bernal F, Garutti I, Gallart L, Ubierna-Ferreras B, Sukia-Zilbeti I, Gálvez-Muñoz C, Delgado-Roel M, Mínguez L, Bermejo S, Valencia O, Real M, Unzueta C, Ferrando C, Sánchez F, González S, Ruiz-Villén C, Lluch A, Hernández A, Hernández-Beslmeisl J, Vives M, Vicente R. Clinical guide to perioperative management for videothoracoscopy lung resection (Section of Cardiac, Vascular and Thoracic Anesthesia, SEDAR; Spanish Society of Thoracic Surgery, SECT; Spanish Society of Physiotherapy). REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2022; 69:266-301. [PMID: 35610172 DOI: 10.1016/j.redare.2021.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 03/19/2021] [Indexed: 06/15/2023]
Abstract
The introduction of video-assisted thoracoscopic (VATS) techniques has led to a new approach in thoracic surgery. VATS is performed by inserting a thoracoscope through a small incisions in the chest wall, thus maximizing the preservation of muscle and tissue. Because of its low rate of morbidity and mortality, VATS is currently the technique of choice in most thoracic procedures. Lung resection by VATS reduces prolonged air leaks, arrhythmia, pneumonia, postoperative pain and inflammatory markers. This reduction in postoperative complications shortens hospital length of stay, and is particularly beneficial in high-risk patients with low tolerance to thoracotomy. Compared with conventional thoracotomy, the oncological results of VATS surgery are similar or even superior to those of open surgery. This aim of this multidisciplinary position statement produced by the thoracic surgery working group of the Spanish Society of Anesthesiology and Reanimation (SEDAR), the Spanish Society of Thoracic Surgery (SECT), and the Spanish Association of Physiotherapy (AEF) is to standardize and disseminate a series of perioperative anaesthesia management guidelines for patients undergoing VATS lung resection surgery. Each recommendation is based on an in-depth review of the available literature by the authors. In this document, the care of patients undergoing VATS surgery is organized in sections, starting with the surgical approach, and followed by the three pillars of anaesthesia management: preoperative, intraoperative, and postoperative anaesthesia.
Collapse
Affiliation(s)
- M Granell-Gil
- Sección en Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Profesor Contratado Doctor en Anestesiología, Universitat de València, Valencia, Spain
| | - M Murcia-Anaya
- Anestesiología, Reanimación y T. Dolor, Unidad de Cuidados Intensivos, Hospital IMED Valencia, Valencia, Spain.
| | - S Sevilla
- Sociedad de Cirugía Torácica, Complejo Hospitalario Universitario de Jaén, Jaén, Spain
| | - R Martínez-Plumed
- Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Valencia, Spain
| | - E Biosca-Pérez
- Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Valencia, Spain
| | - F Cózar-Bernal
- Cirugía Torácica, Hospital Universitario Virgen Macarena, Sevilla, Spain
| | - I Garutti
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Gregorio Marañón, Madrid, Spain
| | - L Gallart
- Anestesiología, Reanimación y T. Dolor, Hospital del Mar de Barcelona, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - I Sukia-Zilbeti
- Fisioterapia, Hospital Universitario Donostia de San Sebastián, Spain
| | - C Gálvez-Muñoz
- Cirugía Torácica, Hospital General Universitario de Alicante, Alicante, Spain
| | - M Delgado-Roel
- Cirugía Torácica, Complejo Hospitalario Universitario La Coruña, La Coruña, Spain
| | - L Mínguez
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario La Fe de Valencia, Valencia, Spain
| | - S Bermejo
- Anestesiología, Reanimación y T. Dolor, Hospital del Mar de Barcelona, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - O Valencia
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Doce de Octubre de Madrid, Madrid, Spain
| | - M Real
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Doce de Octubre de Madrid, Madrid, Spain
| | - C Unzueta
- Anestesiología, Reanimación y T. Dolor, Hospital Sant Pau de Barcelona, Barcelona, Spain
| | - C Ferrando
- Anestesiología, Reanimación y T. Dolor, Hospital Clínic Universitari de Barcelona, Barcelona, Spain
| | - F Sánchez
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario de la Ribera de Alzira, Valencia, Spain
| | - S González
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Donostia de San Sebastián, Spain
| | - C Ruiz-Villén
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Reina Sofía de Córdoba, Córdoba, Spain
| | - A Lluch
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario La Fe de Valencia, Valencia, Spain
| | - A Hernández
- Anestesiología, Reanimación y T. Dolor, Grupo Policlínica de Ibiza, Ibiza, Spain
| | - J Hernández-Beslmeisl
- Anestesiología, Reanimación y T. Dolor, Complejo Hospitalario Universitario de Canarias, Canarias, Spain
| | - M Vives
- Anestesiología, Reanimación y T. Dolor, Hospital Universitari Dr. Josep Trueta de Girona, Girona, Spain
| | - R Vicente
- Sección de Anestesia Cardiaca, Vascular y Torácica, SEDAR, Anestesiología, Reanimación y T. Dolor, Hospital Universitario La Fe de Valencia, Universitat de València, Valencia, Spain
| |
Collapse
|
5
|
Positive end-expiratory pressure individualization guided by continuous end-expiratory lung volume monitoring during laparoscopic surgery. J Clin Monit Comput 2021; 36:1557-1567. [PMID: 34966951 DOI: 10.1007/s10877-021-00800-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 12/24/2021] [Indexed: 10/19/2022]
Abstract
To determine whether end-expiratory lung volume measured with volumetric capnography (EELVCO2) can individualize positive end-expiratory pressure (PEEP) setting during laparoscopic surgery. We studied patients undergoing laparoscopic surgery subjected to Fowler (F-group; n = 20) or Trendelenburg (T-group; n = 20) positions. EELVCO2 was measured at 0° supine (baseline), during capnoperitoneum (CP) at 0° supine, during CP with Fowler (head up + 20°) or Trendelenburg (head down - 30°) positions and after CP back to 0° supine. PEEP was adjusted to preserve baseline EELVCO2 during and after CP. Baseline EELVCO2 was statistically similar to predicted FRC in both groups. At supine and CP, EELVCO2 decreased from baseline values in F-group [median and IQR 2079 (768) to 1545 (725) mL; p = 0.0001] and in T-group [2164 (789) to 1870 (940) mL; p = 0.0001]. Change in body position maintained EELVCO2 unchanged in both groups. PEEP adjustments from 5.6 (1.1) to 10.0 (2.5) cmH2O in the F-group (p = 0.0001) and from 5.6 (0.9) to 10.0 (2.6) cmH2O in T-group (p = 0.0001) were necessary to reach baseline EELVCO2 values. EELVCO2 increased close to baseline with PEEP in the F-group [1984 (600) mL; p = 0.073] and in the T-group [2175 (703) mL; p = 0.167]. After capnoperitoneum and back to 0° supine, PEEP needed to maintain EELVCO2 was similar to baseline PEEP in F-group [5.9 (1.8) cmH2O; p = 0.179] but slightly higher in the T-group [6.5 (2.2) cmH2O; p = 0.006]. Those new PEEP values gave EELVCO2 similar to baseline in the F-group [2039 (980) mL; p = 0.370] and in the T-group [2150 (715) mL; p = 0.881]. Breath-by-breath noninvasive EELVCO2 detected changes in lung volume induced by capnoperitoneum and body position and was useful to individualize the level of PEEP during laparoscopy.Trial registry: Clinicaltrials.gov NCT03693352. Protocol started 1st October 2018.
Collapse
|
6
|
Granell-Gil M, Murcia-Anaya M, Sevilla S, Martínez-Plumed R, Biosca-Pérez E, Cózar-Bernal F, Garutti I, Gallart L, Ubierna-Ferreras B, Sukia-Zilbeti I, Gálvez-Muñoz C, Delgado-Roel M, Mínguez L, Bermejo S, Valencia O, Real M, Unzueta C, Ferrando C, Sánchez F, González S, Ruiz-Villén C, Lluch A, Hernández A, Hernández-Beslmeisl J, Vives M, Vicente R. Clinical guide to perioperative management for videothoracoscopy lung resection (Section of Cardiac, Vascular and Thoracic Anesthesia, SEDAR; Spanish Society of Thoracic Surgery, SECT; Spanish Society of Physiotherapy). REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2021; 69:S0034-9356(21)00129-8. [PMID: 34330548 DOI: 10.1016/j.redar.2021.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 03/09/2021] [Accepted: 03/19/2021] [Indexed: 10/20/2022]
Abstract
The introduction of video-assisted thoracoscopic (VATS) techniques has led to a new approach in thoracic surgery. VATS is performed by inserting a thoracoscope through a small incisions in the chest wall, thus maximizing the preservation of muscle and tissue. Because of its low rate of morbidity and mortality, VATS is currently the technique of choice in most thoracic procedures. Lung resection by VATS reduces prolonged air leaks, arrhythmia, pneumonia, postoperative pain and inflammatory markers. This reduction in postoperative complications shortens hospital length of stay, and is particularly beneficial in high-risk patients with low tolerance to thoracotomy. Compared with conventional thoracotomy, the oncological results of VATS surgery are similar or even superior to those of open surgery. This aim of this multidisciplinary position statement produced by the thoracic surgery working group of the Spanish Society of Anesthesiology and Reanimation (SEDAR), the Spanish Society of Thoracic Surgery (SECT), and the Spanish Association of Physiotherapy (AEF) is to standardize and disseminate a series of perioperative anaesthesia management guidelines for patients undergoing VATS lung resection surgery. Each recommendation is based on an in-depth review of the available literature by the authors. In this document, the care of patients undergoing VATS surgery is organized in sections, starting with the surgical approach, and followed by the three pillars of anaesthesia management: preoperative, intraoperative, and postoperative anaesthesia.
Collapse
Affiliation(s)
- M Granell-Gil
- Sección en Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Profesor Contratado Doctor en Anestesiología, Universitat de València, Valencia, España
| | - M Murcia-Anaya
- Anestesiología, Reanimación y T. Dolor, Unidad de Cuidados Intensivos, Hospital IMED Valencia, Valencia, España.
| | - S Sevilla
- Sociedad de Cirugía Torácica, Complejo Hospitalario Universitario de Jaén, Jaén, España
| | - R Martínez-Plumed
- Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Valencia, España
| | - E Biosca-Pérez
- Anestesiología, Reanimación y T. Dolor, Consorcio Hospital General Universitario de Valencia, Valencia, España
| | - F Cózar-Bernal
- Cirugía Torácica, Hospital Universitario Virgen Macarena, Sevilla, España
| | - I Garutti
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Gregorio Marañón, Madrid, España
| | - L Gallart
- Anestesiología, Reanimación y T. Dolor, Hospital del Mar de Barcelona, Universitat Autònoma de Barcelona, Barcelona, España
| | | | - I Sukia-Zilbeti
- Fisioterapia, Hospital Universitario Donostia, San Sebastián, España
| | - C Gálvez-Muñoz
- Cirugía Torácica, Hospital General Universitario de Alicante, Alicante, España
| | - M Delgado-Roel
- Cirugía Torácica, Complejo Hospitalario Universitario La Coruña, La Coruña, España
| | - L Mínguez
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario La Fe de Valencia, Valencia, España
| | - S Bermejo
- Anestesiología, Reanimación y T. Dolor, Hospital del Mar de Barcelona, Universitat Autònoma de Barcelona, Barcelona, España
| | - O Valencia
- Anestesiología, Reanimación y T. Dolor. Hospital Universitario Doce de Octubre de Madrid, Madrid, España
| | - M Real
- Anestesiología, Reanimación y T. Dolor. Hospital Universitario Doce de Octubre de Madrid, Madrid, España
| | - C Unzueta
- Anestesiología, Reanimación y T. Dolor. Hospital Sant Pau de Barcelona, Barcelona, España
| | - C Ferrando
- Anestesiología, Reanimación y T. Dolor. Hospital Clínic Universitari de Barcelona, Barcelona, España
| | - F Sánchez
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario de la Ribera de Alzira, Valencia, España
| | - S González
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Donostia de San Sebastián, España
| | - C Ruiz-Villén
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario Reina Sofía de Córdoba, Córdoba, España
| | - A Lluch
- Anestesiología, Reanimación y T. Dolor, Hospital Universitario La Fe de Valencia, Valencia, España
| | - A Hernández
- Anestesiología, Reanimación y T. Dolor, Grupo Policlínica de Ibiza, Ibiza, España
| | - J Hernández-Beslmeisl
- Anestesiología, Reanimación y T. Dolor, Complejo Hospitalario Universitario de Canarias, Canarias, España
| | - M Vives
- Anestesiología, Reanimación y T. Dolor, Hospital Universitari Dr. Josep Trueta de Girona, Girona, España
| | - R Vicente
- Sección de Anestesia Cardiaca, Vascular y Torácica, SEDAR, Anestesiología, Reanimación y T. Dolor. Hospital Universitario La Fe de Valencia, Universitat de València, Valencia, España
| |
Collapse
|
7
|
Individualized versus Fixed Positive End-expiratory Pressure for Intraoperative Mechanical Ventilation in Obese Patients: A Secondary Analysis. Anesthesiology 2021; 134:887-900. [PMID: 33843980 DOI: 10.1097/aln.0000000000003762] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND General anesthesia may cause atelectasis and deterioration in oxygenation in obese patients. The authors hypothesized that individualized positive end-expiratory pressure (PEEP) improves intraoperative oxygenation and ventilation distribution compared to fixed PEEP. METHODS This secondary analysis included all obese patients recruited at University Hospital of Leipzig from the multicenter Protective Intraoperative Ventilation with Higher versus Lower Levels of Positive End-Expiratory Pressure in Obese Patients (PROBESE) trial (n = 42) and likewise all obese patients from a local single-center trial (n = 54). Inclusion criteria for both trials were elective laparoscopic abdominal surgery, body mass index greater than or equal to 35 kg/m2, and Assess Respiratory Risk in Surgical Patients in Catalonia (ARISCAT) score greater than or equal to 26. Patients were randomized to PEEP of 4 cm H2O (n = 19) or a recruitment maneuver followed by PEEP of 12 cm H2O (n = 21) in the PROBESE study. In the single-center study, they were randomized to PEEP of 5 cm H2O (n = 25) or a recruitment maneuver followed by individualized PEEP (n = 25) determined by electrical impedance tomography. Primary endpoint was Pao2/inspiratory oxygen fraction before extubation and secondary endpoints included intraoperative tidal volume distribution to dependent lung and driving pressure. RESULTS Ninety patients were evaluated in three groups after combining the two lower PEEP groups. Median individualized PEEP was 18 (interquartile range, 16 to 22; range, 10 to 26) cm H2O. Pao2/inspiratory oxygen fraction before extubation was 515 (individual PEEP), 370 (fixed PEEP of 12 cm H2O), and 305 (fixed PEEP of 4 to 5 cm H2O) mmHg (difference to individualized PEEP, 145; 95% CI, 91 to 200; P < 0.001 for fixed PEEP of 12 cm H2O and 210; 95% CI, 164 to 257; P < 0.001 for fixed PEEP of 4 to 5 cm H2O). Intraoperative tidal volume in the dependent lung areas was 43.9% (individualized PEEP), 25.9% (fixed PEEP of 12 cm H2O) and 26.8% (fixed PEEP of 4 to 5 cm H2O) (difference to individualized PEEP: 18.0%; 95% CI, 8.0 to 20.7; P < 0.001 for fixed PEEP of 12 cm H2O and 17.1%; 95% CI, 10.0 to 20.6; P < 0.001 for fixed PEEP of 4 to 5 cm H2O). Mean intraoperative driving pressure was 9.8 cm H2O (individualized PEEP), 14.4 cm H2O (fixed PEEP of 12 cm H2O), and 18.8 cm H2O (fixed PEEP of 4 to 5 cm H2O), P < 0.001. CONCLUSIONS This secondary analysis of obese patients undergoing laparoscopic surgery found better oxygenation, lower driving pressures, and redistribution of ventilation toward dependent lung areas measured by electrical impedance tomography using individualized PEEP. The impact on patient outcome remains unclear. EDITOR’S PERSPECTIVE
Collapse
|
8
|
Haren AP, Nair S, Pace MC, Sansone P. Intraoperative Monitoring of the Obese Patient Undergoing Surgery: A Narrative Review. Adv Ther 2021; 38:3622-3651. [PMID: 34091873 PMCID: PMC8179704 DOI: 10.1007/s12325-021-01774-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/05/2021] [Indexed: 12/17/2022]
Abstract
With the increasing prevalence of obesity in the population, anaesthetists must confidently manage both the pathophysiological and technical challenges presented in bariatric and non-bariatric surgery. The intraoperative period represents an important opportunity to optimise and mitigate risk. However, there is little formal guidance on what intraoperative monitoring techniques should be used in this population. This narrative review collates the existing evidence for intraoperative monitoring devices in the obese patients. Although a number of non-invasive blood pressure monitors have been tested, an invasive arterial line remains the most reliable monitor if accurate, continuous monitoring is required. Goal-directed fluid therapy is recommended by clinical practice guidelines, but the methods tested to assess this had guarded applicability to the obese population. Transcutaneous carbon dioxide (CO2) monitoring may offer additional benefit to standard capnography in this population. Individually titrated positive end expiratory pressure (PEEP) and recruitment manoeuvres improved intraoperative mechanics but yielded no benefit in the immediate postoperative period. Depth of anaesthesia monitoring appears to be beneficial in the perioperative period regarding recovery times and complications. Objective confirmation of reversal of neuromuscular blockade continues to be a central tenet of anaesthesia practice, particularly relevant to this group who have been characterised as an "at risk" extubation group. Where deep neuromuscular blockade is used, continuous neuromuscular blockade is suggested. Both obesity and the intraoperative context represent somewhat unstable search terms, as the clinical implications of the obesity phenotype are not uniform, and the type and urgency of surgery have significant impact on the intraoperative setting. This renders the generation of summary conclusions around what intraoperative monitoring techniques are suitable in this population highly challenging.
Collapse
|
9
|
Prevention of atelectasis by continuous positive airway pressure in anaesthetised children: A randomised controlled study. Eur J Anaesthesiol 2021; 38:41-48. [PMID: 33009190 DOI: 10.1097/eja.0000000000001351] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Continuous positive airway pressure (CPAP) prevents peri-operative atelectasis in adults, but its effect in children has not been quantified. OBJECTIVE The aim of this study was to evaluate the role of CPAP in preventing postinduction and postoperative atelectasis in children under general anaesthesia. DESIGN A randomised controlled study. SETTING Single-institution study, community hospital, Mar del Plata. Argentina. PATIENTS We studied 42 children, aged 6 months to 7 years, American Society of Anesthesiologists physical status class I, under standardised general anaesthesia. INTERVENTIONS Patients were randomised into two groups: Control group (n = 21): induction and emergence of anaesthesia without CPAP; and CPAP group (n = 21): 5 cmH2O of CPAP during induction and emergence of anaesthesia. Lung ultrasound (LUS) imaging was performed before and 5 min after anaesthesia induction. Children without atelectasis were ventilated in the same manner as the Control group with standard ventilatory settings including 5 cmH2O of PEEP. Children with atelectasis received a recruitment manoeuvre followed by standard ventilation with 8 cmH2O of PEEP. Then, at the end of surgery, LUS images were repeated before tracheal extubation and 60 min after awakening. MAIN OUTCOME MEASURES Lung aeration score and atelectasis assessed by LUS. RESULTS Before anaesthesia, all children were free of atelectasis. After induction, 95% in the Control group developed atelectasis compared with 52% of patients in the CPAP group (P < 0.0001). LUS aeration scores were higher (impaired aeration) in the Control group than the CPAP group (8.8 ± 3.8 vs. 3.5 ± 3.3 points; P < 0.0001). At the end of surgery, before tracheal extubation, atelectasis was observed in 100% of children in the Control and 29% of the CPAP group (P < 0.0001) with a corresponding aeration score of 9.6 ± 3.2 and 1.8 ± 2.3, respectively (P < 0.0001). After surgery, 30% of children in the Control group and 10% in the CPAP group presented with residual atelectasis (P < 0.0001) also corresponding to a higher aeration score in the Control group (2.5 ± 3.1) when compared with the CPAP group (0.5 ± 1.5; P < 0.01). CONCLUSION The use of 5 cmH2O of CPAP in healthy children of the studied age span during induction and emergence of anaesthesia effectively prevents atelectasis, with benefits maintained during the first postoperative hour. TRIAL REGISTRY Clinicaltrials.gov NCT03461770.
Collapse
|
10
|
Nguyen TK, Mai DH, Le AN, Nguyen QH, Nguyen CT, Vu TA. A review of intraoperative lung-protective mechanical ventilation strategy. TRENDS IN ANAESTHESIA AND CRITICAL CARE 2021. [DOI: 10.1016/j.tacc.2020.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
11
|
Südy R, Peták F, Kiss L, Balogh ÁL, Fodor GH, Korsós A, Schranc Á, Babik B. Obesity and diabetes: similar respiratory mechanical but different gas exchange defects. Am J Physiol Lung Cell Mol Physiol 2020; 320:L368-L376. [PMID: 33264577 DOI: 10.1152/ajplung.00439.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Diabetes mellitus increases smooth muscle tone and causes tissue remodeling, affecting elastin and collagen. Although the lung is dominated by these elements, diabetes is expected to modify the airway function and respiratory tissue mechanics. Therefore, we characterized the respiratory function in patients with diabetes with and without associated obesity. Mechanically ventilated patients with normal body shapes were divided into the control nondiabetic (n = 73) and diabetic (n = 31) groups. The other two groups included obese patients without diabetes (n = 43) or with diabetes (n = 30). The mechanical properties of the respiratory system were determined by forced oscillation technique. Airway resistance (Raw), tissue damping (G), and tissue elastance (H) were assessed by forced oscillation. Capnography was applied to determine phase 3 slopes and dead space indices. The intrapulmonary shunt fraction (Qs/Qt) and the lung oxygenation index (PaO2/FIO2) were estimated from arterial and central venous blood samples. Compared with the corresponding control groups, diabetes alone increased the Raw (7.6 ± 6 cmH2O.s/l vs. 3.1 ± 1.9 cmH2O.s/l), G (11.7 ± 5.5 cmH2O/l vs. 6.5 ± 2.8 cmH2O/l), and H (31.5 ± 11.8 cmH2O/l vs. 24.2 ± 7.2 cmH2O/l (P < 0.001 for all). Diabetes increased the capnographic phase 3 slope, whereas PaO2/FIO2 or Qs/Qt was not affected. Obesity alone caused similar detrimental changes in respiratory mechanics and alveolar heterogeneity, but these alterations also compromised gas exchange. We conclude that diabetes-induced intrinsic mechanical abnormalities are counterbalanced by hypoxic pulmonary vasoconstriction, which maintained intrapulmonary shunt fraction and oxygenation ability of the lungs.
Collapse
Affiliation(s)
- Roberta Südy
- Department of Anaesthesiology and Intensive Therapy, University of Szeged, Szeged, Hungary.,Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Ferenc Peták
- Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Liliána Kiss
- Department of Anaesthesiology and Intensive Therapy, University of Szeged, Szeged, Hungary.,Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Ádám L Balogh
- Department of Anaesthesiology and Intensive Therapy, University of Szeged, Szeged, Hungary.,Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Gergely H Fodor
- Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Anita Korsós
- Department of Anaesthesiology and Intensive Therapy, University of Szeged, Szeged, Hungary
| | - Álmos Schranc
- Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary
| | - Barna Babik
- Department of Anaesthesiology and Intensive Therapy, University of Szeged, Szeged, Hungary
| |
Collapse
|
12
|
Abstract
Obesity is an important risk factor for major complications, morbidity and mortality related to intubation procedures and ventilation in the intensive care unit (ICU). The fall in functional residual capacity promotes airway closure and atelectasis formation. This narrative review presents the impact of obesity on the respiratory system and the key points to optimize airway management, noninvasive and invasive mechanical ventilation in ICU patients with obesity. Non-invasive strategies should first optimize body position with reverse Trendelenburg position or sitting position. Noninvasive ventilation (NIV) is considered as the first-line therapy in patients with obesity having a postoperative acute respiratory failure. Positive pressure pre-oxygenation before the intubation procedure is the method of reference. The use of videolaryngoscopy has to be considered by adequately trained intensivists, especially in patients with several risk factors. Regarding mechanical ventilation in patients with and without acute respiratory distress syndrome (ARDS), low tidal volume (6 ml/kg of predicted body weight) and moderate to high positive end-expiratory pressure (PEEP), with careful recruitment maneuver in selected patients, are advised. Prone positioning is a therapeutic choice in severe ARDS patients with obesity. Prophylactic NIV should be considered after extubation to prevent re-intubation. If obesity increases mortality and risk of ICU admission in the overall population, the impact of obesity on ICU mortality is less clear and several confounding factors have to be taken into account regarding the “obesity ICU paradox”.
Collapse
|
13
|
Effect of recumbency and body condition score on open-lung positive end-expiratory pressure and respiratory system compliance following a stepwise lung recruitment manoeuvre in healthy dogs during general anaesthesia. Res Vet Sci 2020; 132:177-185. [PMID: 32593862 DOI: 10.1016/j.rvsc.2020.06.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 06/15/2020] [Accepted: 06/15/2020] [Indexed: 12/16/2022]
Abstract
The aim was to assess the effects of recumbency and body condition score (BCS) on open-lung positive end-expiratory pressure (OL-PEEP) and quasistatic respiratory system compliance (Crs) following stepwise lung recruitment manoeuvre (RM) in healthy dogs under general anaesthesia. Thirty-four dogs were anaesthetised and mechanically ventilated (tidal volume of 10 mL/kg) without PEEP for 1 min (baseline). A stepwise RM was then performed and the individual OL-PEEP was subsequently applied. The Crs was registered at baseline and every 10-min for 50 min after RM. Dogs were classified into either dorsal or lateral recumbency groups, and as normal (score 4-5/9) or high (≥6/9) BCS groups. The OL-PEEP was higher in lateral than in dorsal recumbency (P = .002), but differences were not observed between normal and high BCS (P = .865). The Crs was increased from baseline at all time points after RM in all groups. The Crs did not differ between dorsally and laterally recumbent dogs at any time point. However, the baseline Crs was significantly lower in dogs with a high BCS than in those with a normal BCS (P < .001); therefore, the absolute change from baseline was considered when comparing Crs after the RM and it was similar in both BCS groups. In conclusion, in anaesthetised healthy dogs the OL-PEEP following RM was lower when dogs were positioned in dorsal than in lateral recumbency. The Crs after RM remained unchanged regardless of the dogs' recumbency. A stepwise RM followed by OL-PEEP could compensate for the potential negative impact of moderately increased BCS on Crs.
Collapse
|
14
|
Abstract
Volume capnography provides a noninvasive, continuous display of the fractional concentration or partial pressure of carbon dioxide (Pco2) versus exhaled volume. Derived measurements and calculations are influenced by changes in both ventilation and perfusion and are therefore useful for assessing both respiratory and cardiovascular function. This article provides an evidence-based review of several potential uses of volume capnography in the intensive care unit: 1) monitoring the effectiveness of ventilation by using end-tidal Pco2 as a surrogate for arterial Pco2, 2) assessing volume responsiveness, 3) measuring cardiac output, 4) determining prognosis in patients with the acute respiratory distress syndrome, 5) optimizing alveolar recruitment, and 6) excluding pulmonary embolism. Studies performed during the past few decades have clearly shown that volume capnography can provide important prognostic information in patients with acute respiratory distress syndrome and that end-tidal Pco2 should not be used to estimate or even to monitor the direction of change in the arterial Pco2 in mechanically ventilated intensive care unit patients. Unfortunately, few conclusions can be made from studies evaluating other potential applications. Of these, the most promising are the noninvasive measurement of cardiac output and optimization of alveolar recruitment in patients with acute respiratory distress syndrome and in mechanically ventilated, morbidly obese patients.
Collapse
|
15
|
Abstract
INTRODUCTION The use of mechanical ventilation is an invaluable tool in caring for critically ill patients. Enhancing our capabilities in mechanical ventilation has been instrumental in the ability to support clinical conditions and diseases which were once associated with high mortality. Areas covered: Within this manuscript, we will look to discuss emerging approaches to improving the care of pediatric patients who require mechanical ventilation. After an extensive literature search, we will provide a brief review of the history and pathophysiology of acute respiratory distress syndrome, an assessment of several ventilator settings, a discussion on assisted ventilation, review of therapy used to rescue in severe respiratory failure, methods of monitoring the effects of mechanical ventilation, and nutrition. Expert opinion: As we have advanced in our care, we are seeing children survive illnesses that would have once claimed their lives. Given this knowledge, we must continue to advance the research in pediatric critical care to understand the means in which we can tailor the therapy to the patient in efforts to efficiently liberate them from mechanical ventilation once their illness has resolved.
Collapse
Affiliation(s)
- Duane C Williams
- a Division of Pediatric Critical Care Medicine, Department of Pediatrics , Penn State Hershey Children's Hospital , Hershey , PA , USA
| | - Ira M Cheifetz
- b Division of Pediatric Critical Care Medicine, Department of Pediatrics , Duke Children's Hospital , Durham , NC , USA
| |
Collapse
|
16
|
Lung-protective ventilation for the surgical patient: international expert panel-based consensus recommendations. Br J Anaesth 2019; 123:898-913. [DOI: 10.1016/j.bja.2019.08.017] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 07/22/2019] [Accepted: 08/04/2019] [Indexed: 12/16/2022] Open
|
17
|
Ferrando C, Tusman G, Suarez-Sipmann F. Intraoperative Ventilation Strategies to Reduce Pulmonary Complications in Obese Patients. JAMA 2019; 322:1828. [PMID: 31714980 DOI: 10.1001/jama.2019.14394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Carlos Ferrando
- Anesthesiology and Critical Care Hospital Clínic, Institut D'investigació August Pi i Sunyer, Barcelona, Spain
| | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | | |
Collapse
|
18
|
Multimodal non-invasive monitoring to apply an open lung approach strategy in morbidly obese patients during bariatric surgery. J Clin Monit Comput 2019; 34:1015-1024. [PMID: 31654282 DOI: 10.1007/s10877-019-00405-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 10/14/2019] [Indexed: 01/20/2023]
Abstract
To evaluate the use of non-invasive variables for monitoring an open-lung approach (OLA) strategy in bariatric surgery. Twelve morbidly obese patients undergoing bariatric surgery received a baseline protective ventilation with 8 cmH2O of positive-end expiratory pressure (PEEP). Then, the OLA strategy was applied consisting in lung recruitment followed by a decremental PEEP trial, from 20 to 8 cmH2O, in steps of 2 cmH2O to find the lung's closing pressure. Baseline ventilation was then resumed setting open lung PEEP (OL-PEEP) at 2 cmH2O above this pressure. The multimodal non-invasive variables used for monitoring OLA consisted in pulse oximetry (SpO2), respiratory compliance (Crs), end-expiratory lung volume measured by a capnodynamic method (EELVCO2), and esophageal manometry. OL-PEEP was detected at 15.9 ± 1.7 cmH2O corresponding to a positive end-expiratory transpulmonary pressure (PL,ee) of 0.9 ± 1.1 cmH2O. ROC analysis showed that SpO2 was more accurate (AUC 0.92, IC95% 0.87-0.97) than Crs (AUC 0.76, IC95% 0.87-0.97) and EELVCO2 (AUC 0.73, IC95% 0.64-0.82) to detect the lung's closing pressure according to the change of PL,ee from positive to negative values. Compared to baseline ventilation with 8 cmH2O of PEEP, OLA increased EELVCO2 (1309 ± 517 vs. 2177 ± 679 mL) and decreased driving pressure (18.3 ± 2.2 vs. 10.1 ± 1.7 cmH2O), estimated shunt (17.7 ± 3.4 vs. 4.2 ± 1.4%), lung strain (0.39 ± 0.07 vs. 0.22 ± 0.06) and lung elastance (28.4 ± 5.8 vs. 15.3 ± 4.3 cmH2O/L), respectively; all p < 0.0001. The OLA strategy can be monitored using noninvasive variables during bariatric surgery. This strategy decreased lung strain, elastance and driving pressure compared with standard protective ventilatory settings.Clinical trial number NTC03694665.
Collapse
|
19
|
Individual Positive End-expiratory Pressure Settings Optimize Intraoperative Mechanical Ventilation and Reduce Postoperative Atelectasis. Anesthesiology 2019; 129:1070-1081. [PMID: 30260897 DOI: 10.1097/aln.0000000000002435] [Citation(s) in RCA: 164] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
WHAT WE ALREADY KNOW ABOUT THIS TOPIC WHAT THIS ARTICLE TELLS US THAT IS NEW: BACKGROUND:: Intraoperative lung-protective ventilation has been recommended to reduce postoperative pulmonary complications after abdominal surgery. Although the protective role of a more physiologic tidal volume has been established, the added protection afforded by positive end-expiratory pressure (PEEP) remains uncertain. The authors hypothesized that a low fixed PEEP might not fit all patients and that an individually titrated PEEP during anesthesia might improve lung function during and after surgery. METHODS Forty patients were studied in the operating room (20 laparoscopic and 20 open-abdominal). They underwent elective abdominal surgery and were randomized to institutional PEEP (4 cm H2O) or electrical impedance tomography-guided PEEP (applied after recruitment maneuvers and targeted at minimizing lung collapse and hyperdistension, simultaneously). Patients were extubated without changing selected PEEP or fractional inspired oxygen tension while under anesthesia and submitted to chest computed tomography after extubation. Our primary goal was to individually identify the electrical impedance tomography-guided PEEP value producing the best compromise of lung collapse and hyperdistention. RESULTS Electrical impedance tomography-guided PEEP varied markedly across individuals (median, 12 cm H2O; range, 6 to 16 cm H2O; 95% CI, 10-14). Compared with PEEP of 4 cm H2O, patients randomized to the electrical impedance tomography-guided strategy had less postoperative atelectasis (6.2 ± 4.1 vs. 10.8 ± 7.1% of lung tissue mass; P = 0.017) and lower intraoperative driving pressures (mean values during surgery of 8.0 ± 1.7 vs. 11.6 ± 3.8 cm H2O; P < 0.001). The electrical impedance tomography-guided PEEP arm had higher intraoperative oxygenation (435 ± 62 vs. 266 ± 76 mmHg for laparoscopic group; P < 0.001), while presenting equivalent hemodynamics (mean arterial pressure during surgery of 80 ± 14 vs. 78 ± 15 mmHg; P = 0.821). CONCLUSIONS PEEP requirements vary widely among patients receiving protective tidal volumes during anesthesia for abdominal surgery. Individualized PEEP settings could reduce postoperative atelectasis (measured by computed tomography) while improving intraoperative oxygenation and driving pressures, causing minimum side effects.
Collapse
|
20
|
Nestler C, Simon P, Petroff D, Hammermüller S, Kamrath D, Wolf S, Dietrich A, Camilo LM, Beda A, Carvalho AR, Giannella-Neto A, Reske AW, Wrigge H. Individualized positive end-expiratory pressure in obese patients during general anaesthesia: a randomized controlled clinical trial using electrical impedance tomography. Br J Anaesth 2019; 119:1194-1205. [PMID: 29045567 DOI: 10.1093/bja/aex192] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/23/2017] [Indexed: 11/14/2022] Open
Abstract
Background General anaesthesia leads to atelectasis, reduced end-expiratory lung volume (EELV), and diminished arterial oxygenation in obese patients. We hypothesized that a combination of a recruitment manoeuvre (RM) and individualized positive end-expiratory pressure (PEEP) can avoid these effects. Methods Patients with a BMI ≥35 kg m -2 undergoing elective laparoscopic surgery were randomly allocated to mechanical ventilation with a tidal volume of 8 ml kg -1 predicted body weight and (i) an RM followed by individualized PEEP titrated using electrical impedance tomography (PEEP IND ) or (ii) no RM and PEEP of 5 cm H 2 O (PEEP 5 ). Gas exchange, regional ventilation distribution, and EELV (multiple breath nitrogen washout method) were determined before, during, and after anaesthesia. The primary end point was the ratio of arterial partial pressure of oxygen to inspiratory oxygen fraction ( P aO 2 / F iO 2 ). Results For PEEP IND ( n =25) and PEEP 5 ( n =25) arms together, P aO 2 / F iO 2 and EELV decreased by 15 kPa [95% confidence interval (CI) 11-20 kPa, P <0.001] and 1.2 litres (95% CI 0.9-1.6 litres, P <0.001), respectively, after intubation. Mean ( sd ) PEEP IND was 18.5 (5.6) cm H 2 O. In the PEEP IND arm, P aO 2 / F iO 2 before extubation was 23 kPa higher (95% CI 16-29 kPa; P <0.001), EELV was 1.8 litres larger (95% CI 1.5-2.2 litres; P <0.001), driving pressure was 6.7 cm H 2 O lower (95% CI 5.4-7.9 cm H 2 O; P <0.001), and regional ventilation was more equally distributed than for PEEP 5 . After extubation, however, these differences between the arms vanished. Conclusions In obese patients, an RM and higher PEEP IND restored EELV, regional ventilation distribution, and oxygenation during anaesthesia, but these differences did not persist after extubation. Therefore, lung protection strategies should include the postoperative period. Clinical trial registration German clinical trials register DRKS00004199, www.who.int/ictrp/network/drks2/en/ .
Collapse
Affiliation(s)
- C Nestler
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
| | - P Simon
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.,Integrated Research and Treatment Centre (IFB) AdiposityDiseases
| | - D Petroff
- Integrated Research and Treatment Centre (IFB) AdiposityDiseases.,Clinical Trial Centre
| | - S Hammermüller
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
| | - D Kamrath
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
| | - S Wolf
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
| | - A Dietrich
- Integrated Research and Treatment Centre (IFB) AdiposityDiseases.,Department of Surgery, University of Leipzig, Leipzig, Germany
| | - L M Camilo
- Laboratory of Pulmonary Engineering, Biomedical Engineering Program, Alberto Luis Coimbra Institute of Post-Graduation and Research in Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - A Beda
- Department of Electronic Engineering and Postgraduate Program of Electrical Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - A R Carvalho
- Laboratory of Pulmonary Engineering, Biomedical Engineering Program, Alberto Luis Coimbra Institute of Post-Graduation and Research in Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Laboratory of Respiration Physiology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - A Giannella-Neto
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.,Laboratory of Pulmonary Engineering, Biomedical Engineering Program, Alberto Luis Coimbra Institute of Post-Graduation and Research in Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - A W Reske
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.,Integrated Research and Treatment Centre (IFB) AdiposityDiseases
| | - H Wrigge
- Department of Anaesthesia and Intensive Care Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.,Integrated Research and Treatment Centre (IFB) AdiposityDiseases
| |
Collapse
|
21
|
Parazzi PL, Marson FA, Ribeiro MA, Schivinski CI, Ribeiro JD. Evaluation of respiratory dynamics by volumetric capnography during submaximal exercise protocol of six minutes on treadmill in cystic fibrosis patients. JORNAL DE PEDIATRIA (VERSÃO EM PORTUGUÊS) 2019. [DOI: 10.1016/j.jpedp.2017.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
|
22
|
Parazzi PLF, Marson FAL, Ribeiro MAGO, Schivinski CIS, Ribeiro JD. Evaluation of respiratory dynamics by volumetric capnography during submaximal exercise protocol of six minutes on treadmill in cystic fibrosis patients. J Pediatr (Rio J) 2019; 95:76-86. [PMID: 29195083 DOI: 10.1016/j.jped.2017.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/17/2017] [Accepted: 10/20/2017] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVES Volumetric capnography provides the standard CO2 elimination by the volume expired per respiratory cycle and is a measure to assess pulmonary involvement. Thus, the objective of this study was to evaluate the respiratory dynamics of healthy control subjects and those with cystic fibrosis in a submaximal exercise protocol for six minutes on the treadmill, using volumetric capnography parameters (slope 3 [Slp3], Slp3/tidal volume [Slp3/TV], and slope 2 [Slp2]). METHODS This was a cross-sectional study with 128 subjects (cystic fibrosis, 64 subjects; controls, 64 subjects]. Participants underwent volumetric capnography before, during, and after six minutes on the treadmill. Statistical analysis was performed using the Friedman, Mann-Whitney, and Kruskal-Wallis tests, considering age and sex. An alpha=0.05 was considered. RESULTS Six minutes on the treadmill evaluation: in cystic fibrosis, volumetric capnography parameters were different before, during, and after six minutes on the treadmill; the same was observed for the controls, except for Slp2. Regarding age, an Slp3 difference was observed in cystic fibrosis patients regardless of age, at all moments, and in controls for age≥12 years; a difference in Slp3/TV was observed in cystic fibrosis and controls, regardless of age; and an Slp2 difference in the cystic fibrosis, regardless of age. Regarding sex, Slp3 and Slp3/TV differences were observed in cystic fibrosis regardless of sex, and in controls in male participants; an Slp2 difference was observed in the cystic fibrosis and female participants. The analysis between groups (cystic fibrosis and controls) indicated that Slp3 and Slp3/TV has identified the CF, regardless of age and sex, while the Slp2 showed the CF considering age. CONCLUSIONS Cystic fibrosis showed greater values of the parameters before, during, and after exercise, even when stratified by age and sex, which may indicate ventilation inhomogeneity in the peripheral pathways in the cystic fibrosis.
Collapse
Affiliation(s)
- Paloma L F Parazzi
- Universidade Estadual de Campinas (Unicamp), Faculdade de Ciências Médicas, Departamento de Pediatria, Campinas, SP, Brazil.
| | - Fernando A L Marson
- Universidade Estadual de Campinas (Unicamp), Faculdade de Ciências Médicas, Departamento de Pediatria, Campinas, SP, Brazil; Universidade Estadual de Campinas (Unicamp), Faculdade de Ciências Médicas, Departamento de Genética Médica, Campinas, SP, Brazil.
| | - Maria A G O Ribeiro
- Universidade Estadual de Campinas (Unicamp), Faculdade de Ciências Médicas, Departamento de Pediatria, Campinas, SP, Brazil
| | - Camila I S Schivinski
- Universidade do Estado de Santa Catarina (UDESC), Centro de Educação Física e Esporte, Florianópolis, SC, Brazil
| | - José D Ribeiro
- Universidade Estadual de Campinas (Unicamp), Faculdade de Ciências Médicas, Departamento de Pediatria, Campinas, SP, Brazil
| |
Collapse
|
23
|
Blankman P, Shono A, Hermans BJM, Wesselius T, Hasan D, Gommers D. Detection of optimal PEEP for equal distribution of tidal volume by volumetric capnography and electrical impedance tomography during decreasing levels of PEEP in post cardiac-surgery patients. Br J Anaesth 2018; 116:862-9. [PMID: 27199318 PMCID: PMC4872863 DOI: 10.1093/bja/aew116] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2016] [Indexed: 01/26/2023] Open
Abstract
Background Homogeneous ventilation is important for prevention of ventilator-induced lung injury. Electrical impedance tomography (EIT) has been used to identify optimal PEEP by detection of homogenous ventilation in non-dependent and dependent lung regions. We aimed to compare the ability of volumetric capnography and EIT in detecting homogenous ventilation between these lung regions. Methods Fifteen mechanically-ventilated patients after cardiac surgery were studied. Ventilator settings were adjusted to volume-controlled mode with a fixed tidal volume (Vt) of 6–8 ml kg−1 predicted body weight. Different PEEP levels were applied (14 to 0 cm H2O, in steps of 2 cm H2O) and blood gases, Vcap and EIT were measured. Results Tidal impedance variation of the non-dependent region was highest at 6 cm H2O PEEP, and decreased significantly at 14 cm H2O PEEP indicating decrease in the fraction of Vt in this region. At 12 cm H2O PEEP, homogenous ventilation was seen between both lung regions. Bohr and Enghoff dead space calculations decreased from a PEEP of 10 cm H2O. Alveolar dead space divided by alveolar Vt decreased at PEEP levels ≤6 cm H2O. The normalized slope of phase III significantly changed at PEEP levels ≤4 cm H2O. Airway dead space was higher at higher PEEP levels and decreased at the lower PEEP levels. Conclusions In postoperative cardiac patients, calculated dead space agreed well with EIT to detect the optimal PEEP for an equal distribution of inspired volume, amongst non-dependent and dependent lung regions. Airway dead space reduces at decreasing PEEP levels.
Collapse
Affiliation(s)
- P Blankman
- Department of Adult Intensive Care, Erasmus MC, Room H623, 's Gravendijkwal 230, Rotterdam 3015 CE, The Netherlands
| | - A Shono
- Department of Adult Intensive Care, Erasmus MC, Room H623, 's Gravendijkwal 230, Rotterdam 3015 CE, The Netherlands
| | - B J M Hermans
- Institute for Biomedical Technology & Technical Medicine, University of Twente, Enschede, The Netherlands
| | - T Wesselius
- Institute for Biomedical Technology & Technical Medicine, University of Twente, Enschede, The Netherlands
| | - D Hasan
- Department of Adult Intensive Care, Erasmus MC, Room H623, 's Gravendijkwal 230, Rotterdam 3015 CE, The Netherlands Institute for Immunotherapy, Duderstadt, Germany
| | - D Gommers
- Department of Adult Intensive Care, Erasmus MC, Room H623, 's Gravendijkwal 230, Rotterdam 3015 CE, The Netherlands
| |
Collapse
|
24
|
|
25
|
Guay J, Ochroch EA, Kopp S. Intraoperative use of low volume ventilation to decrease postoperative mortality, mechanical ventilation, lengths of stay and lung injury in adults without acute lung injury. Cochrane Database Syst Rev 2018; 7:CD011151. [PMID: 29985541 PMCID: PMC6513630 DOI: 10.1002/14651858.cd011151.pub3] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Since the 2000s, there has been a trend towards decreasing tidal volumes for positive pressure ventilation during surgery. This an update of a review first published in 2015, trying to determine if lower tidal volumes are beneficial or harmful for patients. OBJECTIVES To assess the benefit of intraoperative use of low tidal volume ventilation (less than 10 mL/kg of predicted body weight) compared with high tidal volumes (10 mL/kg or greater) to decrease postoperative complications in adults without acute lung injury. SEARCH METHODS We searched the Cochrane Central Register of Controlled Trials (CENTRAL 2017, Issue 5), MEDLINE (OvidSP) (from 1946 to 19 May 2017), Embase (OvidSP) (from 1974 to 19 May 2017) and six trial registries. We screened the reference lists of all studies retained and of recent meta-analysis related to the topic during data extraction. We also screened conference proceedings of anaesthesiology societies, published in two major anaesthesiology journals. The search was rerun 3 January 2018. SELECTION CRITERIA We included all parallel randomized controlled trials (RCTs) that evaluated the effect of low tidal volumes (defined as less than 10 mL/kg) on any of our selected outcomes in adults undergoing any type of surgery. We did not retain studies with participants requiring one-lung ventilation. DATA COLLECTION AND ANALYSIS Two authors independently assessed the quality of the retained studies with the Cochrane 'Risk of bias' tool. We analysed data with both fixed-effect (I2 statistic less than 25%) or random-effects (I2 statistic greater than 25%) models based on the degree of heterogeneity. When there was an effect, we calculated a number needed to treat for an additional beneficial outcome (NNTB) using the odds ratio. When there was no effect, we calculated the optimum information size. MAIN RESULTS We included seven new RCTs (536 participants) in the update.In total, we included 19 studies in the review (776 participants in the low tidal volume group and 772 in the high volume group). There are four studies awaiting classification and three are ongoing. All included studies were at some risk of bias. Participants were scheduled for abdominal surgery, heart surgery, pulmonary thromboendarterectomy, spinal surgery and knee surgery. Low tidal volumes used in the studies varied from 6 mL/kg to 8.1 mL/kg while high tidal volumes varied from 10 mL/kg to 12 mL/kg.Based on 12 studies including 1207 participants, the effects of low volume ventilation on 0- to 30-day mortality were uncertain (risk ratio (RR) 0.80, 95% confidence interval (CI) 0.42 to 1.53; I2 = 0%; low-quality evidence). Based on seven studies including 778 participants, lower tidal volumes probably reduced postoperative pneumonia (RR 0.45, 95% CI 0.25 to 0.82; I2 = 0%; moderate-quality evidence; NNTB 24, 95% CI 16 to 160), and it probably reduced the need for non-invasive postoperative ventilatory support based on three studies including 506 participants (RR 0.31, 95% CI 0.15 to 0.64; moderate-quality evidence; NNTB 13, 95% CI 11 to 24). Based on 11 studies including 957 participants, low tidal volumes during surgery probably decreased the need for postoperative invasive ventilatory support (RR 0.33, 95% CI 0.14 to 0.77; I2 = 0%; NNTB 39, 95% CI 30 to 166; moderate-quality evidence). Based on five studies including 898 participants, there may be little or no difference in the intensive care unit length of stay (standardized mean difference (SMD) -0.06, 95% CI -0.22 to 0.10; I2 = 33%; low-quality evidence). Based on 14 studies including 1297 participants, low tidal volumes may have reduced hospital length of stay by about 0.8 days (SMD -0.15, 95% CI -0.29 to 0.00; I2 = 27%; low-quality evidence). Based on five studies including 708 participants, the effects of low volume ventilation on barotrauma (pneumothorax) were uncertain (RR 1.77, 95% CI 0.52 to 5.99; I2 = 0%; very low-quality evidence). AUTHORS' CONCLUSIONS We found moderate-quality evidence that low tidal volumes (defined as less than 10 mL/kg) decreases pneumonia and the need for postoperative ventilatory support (invasive and non-invasive). We found no difference in the risk of barotrauma (pneumothorax), but the number of participants included does not allow us to make definitive statement on this. The four studies in 'Studies awaiting classification' may alter the conclusions of the review once assessed.
Collapse
Affiliation(s)
- Joanne Guay
- University of SherbrookeDepartment of Anesthesiology, Faculty of MedicineSherbrookeQuebecCanada
- University of Quebec in Abitibi‐TemiscamingueTeaching and Research Unit, Health SciencesRouyn‐NorandaQCCanada
- Faculty of Medicine, Laval UniversityDepartment of Anesthesiology and Critical CareQuebec CityQCCanada
| | - Edward A Ochroch
- University of PennsylvaniaDepartment of Anesthesiology3400 Spruce StreetPhiladelphiaPAUSA19104
| | - Sandra Kopp
- Mayo Clinic College of MedicineDepartment of Anesthesiology and Perioperative Medicine200 1st St SWRochesterMNUSA55901
| | | |
Collapse
|
26
|
Ferrando C, Tusman G, Suarez-Sipmann F, León I, Pozo N, Carbonell J, Puig J, Pastor E, Gracia E, Gutiérrez A, Aguilar G, Belda FJ, Soro M. Individualized lung recruitment maneuver guided by pulse-oximetry in anesthetized patients undergoing laparoscopy: a feasibility study. Acta Anaesthesiol Scand 2018; 62:608-619. [PMID: 29377061 DOI: 10.1111/aas.13082] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 12/21/2017] [Accepted: 01/02/2018] [Indexed: 01/27/2023]
Abstract
BACKGROUND We conducted this study to test whether pulse-oximetry hemoglobin saturation (SpO2 ) can personalize the implementation of an open-lung approach during laparoscopy. Thirty patients with SpO2 ≥ 97% on room-air before anesthesia were studied. After anesthesia and capnoperitoneum the FIO2 was reduced to 0.21. Those patients whose SpO2 decreased below 97% - an indication of shunt related to atelectasis - completed the following phases: (1) First recruitment maneuver (RM), until reaching lung's opening pressure, defined as the inspiratory pressure level yielding a SpO2 ≥ 97%; (2) decremental positive end-expiratory (PEEP) titration trial until reaching lung's closing pressure defined as the PEEP level yielding a SpO2 < 97%; (3) second RM and, (4) ongoing ventilation with PEEP adjusted above the detected closing pressure. RESULTS When breathing air, in 24 of 30 patients SpO2 was < 97%, PaO2 /FIO2 ˂ 53.3 kPa and negative end-expiratory transpulmonary pressure (PTP-EE ). The mean (SD) opening pressures were found at 40 (5) and 33 (4) cmH2 O during the first and second RM, respectively (P < 0.001; 95% CI: 3.2-7.7). The closing pressure was found at 11 (5) cmH2 O. This SpO2 -guided approach increased PTP-EE (from -6.4 to 1.2 cmH2 O, P < 0.001) and PaO2 /FIO2 (from 30.3 to 58.1 kPa, P < 0.001) while decreased driving pressure (from 18 to 10 cmH2 O, P < 0.001). SpO2 discriminated the lung's opening and closing pressures with accuracy taking the reference parameter PTP-EE (area under the receiver-operating-curve of 0.89, 95% CI: 0.80-0.99). CONCLUSION The non-invasive SpO2 monitoring can help to individualize an open-lung approach, including all involved steps, from the identification of those patients who can benefit from recruitment, the identification of opening and closing pressures to the subsequent monitoring of an open-lung condition.
Collapse
Affiliation(s)
- C. Ferrando
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
- CIBER de Enfermedades Respiratorias; Instituto de Salud Carlos III; Madrid Spain
| | - G. Tusman
- Department of Anesthesiology; Hospital Privado de Comunidad Mar de Plata; Mar de Plata Argentina
| | - F. Suarez-Sipmann
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
- Deparment of Intensive Care; Hospital Universitario La Princesa; Madrid Spain
| | - I. León
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - N. Pozo
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - J. Carbonell
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - J. Puig
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - E. Pastor
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - E. Gracia
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - A. Gutiérrez
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - G. Aguilar
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - F. J. Belda
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| | - M. Soro
- Department of Anaesthesiology and Critical Care; Hospital Clínico Universitario; Valencia Spain
| |
Collapse
|
27
|
Ferrando C, Soro M, Unzueta C, Canet J, Tusman G, Suarez-Sipmann F, Librero J, Peiró S, Pozo N, Delgado C, Ibáñez M, Aldecoa C, Garutti I, Pestaña D, Rodríguez A, García del Valle S, Diaz-Cambronero O, Balust J, Redondo FJ, De La Matta M, Gallego L, Granell M, Martínez P, Pérez A, Leal S, Alday K, García P, Monedero P, Gonzalez R, Mazzinari G, Aguilar G, Villar J, Belda FJ. Rationale and study design for an individualised perioperative open-lung ventilatory strategy with a high versus conventional inspiratory oxygen fraction (iPROVE-O2) and its effects on surgical site infection: study protocol for a randomised controlled trial. BMJ Open 2017; 7:e016765. [PMID: 28760799 PMCID: PMC5642673 DOI: 10.1136/bmjopen-2017-016765] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
INTRODUCTION Surgical site infection (SSI) is a serious postoperative complication that increases morbidity and healthcare costs. SSIs tend to increase as the partial pressure of tissue oxygen decreases: previous trials have focused on trying to reduce them by comparing high versus conventional inspiratory oxygen fractions (FIO2) in the perioperative period but did not use a protocolised ventilatory strategy. The open-lung ventilatory approach restores functional lung volume and improves gas exchange, and therefore it may increase the partial pressure of tissue oxygen for a given FIO2. The trial presented here aims to compare the efficacy of high versus conventional FIO2 in reducing the overall incidence of SSIs in patients by implementing a protocolised and individualised global approach to perioperative open-lung ventilation. METHODS AND ANALYSIS This is a comparative, prospective, multicentre, randomised and controlled two-arm trial that will include 756 patients scheduled for abdominal surgery. The patients will be randomised into two groups: (1) a high FIO2 group (80% oxygen; FIO2 of 0.80) and (2) a conventional FIO2 group (30% oxygen; FIO2 of 0.30). Each group will be assessed intra- and postoperatively. The primary outcome is the appearance of postoperative SSI complications. Secondary outcomes are the appearance of systemic and pulmonary complications. ETHICS AND DISSEMINATION The iPROVE-O2 trial has been approved by the Ethics Review Board at the reference centre (the Hospital Clínico Universitario in Valencia). Informed consent will be obtained from all patients before their participation. If the approach using high FIO2 during individualised open-lung ventilation decreases SSIs, use of this method will become standard practice for patients scheduled for future abdominal surgery. Publication of the results is anticipated in early 2019. TRIAL REGISTRATION NUMBER NCT02776046; Pre-results.
Collapse
Affiliation(s)
- Carlos Ferrando
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Marina Soro
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Carmen Unzueta
- Department of Anesthesiology and Critical Care, Hospital de la Santa Creu i Sant Pau, Valencia, Spain
| | - Jaume Canet
- Department of Anesthesiology and Critical Care, Hospital Germans Tries i Pujol, Badalona, Spain
| | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | - Fernando Suarez-Sipmann
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Department of Surgical Sciences, Hedenstierna Laboratory, Uppsala University Hospital, Uppsala, Sweden
| | - Julian Librero
- Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC), Navarrabiomed Fundación Miguel Servet, Pamplona, Spain
| | - Salvador Peiró
- Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC), Centro Superior de Investigación en Salud Pública (CSISP FISABIO), Valencia, Spain
| | - Natividad Pozo
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Carlos Delgado
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Maite Ibáñez
- Department of Anesthesiology, Hospital de Villajoyosa, Villajoyosa, Spain
| | - César Aldecoa
- Department of Anesthesiology and Critical Care, Hospital de Villajoyosa, Villajoyosa, Spain
| | - Ignacio Garutti
- Department of Anesthesiology and Critical Care, Hospital General Gregorio Marañon, Madrid, Spain
| | - David Pestaña
- Anesthesiology and Critical Care, Hospital Ramón y Cajal, Madrid, Spain
| | - Aurelio Rodríguez
- Anesthesiology and Critical Care, Hospital Dr. Negrín, Gran Canaria, Spain
| | | | | | - Jaume Balust
- Anesthesiology and Critical Care, Hospital Clínic i Provincial, Barcelona, Spain
| | | | - Manuel De La Matta
- Anesthesiology and Critical Care, Hospital Vírgen del Rocio, Seville, Spain
| | - Lucía Gallego
- Anesthesiology and Critical Care, Hospital Miguel Servet, Zaragoza, Spain
| | - Manuel Granell
- Anesthesiology and Critical Care, Hospital General, Valencia, Spain
| | - Pascual Martínez
- Anesthesiology and Critical Care, Hospital de Albacete, Albacete, Spain
| | - Ana Pérez
- Anesthesiology and Critical Care, Hospital of Elche, Elche, Spain
| | - Sonsoles Leal
- Anesthesiology and Critical Care, Hospital Povisa, Vigo, Spain
| | - Kike Alday
- Anesthesiology and Critical Care, Hospital La Princesa, Madrid, Spain
| | - Pablo García
- Anesthesiology and Critical Care, Hospital 12 de Octubre, Madrid, Spain
| | - Pablo Monedero
- Anesthesiology and Critical Care, Clínica Universidad de Navarra, Pamplona, Spain
| | - Rafael Gonzalez
- Anesthesiology and Critical Care, Hospital Universitario de León, León, Spain
| | - Guido Mazzinari
- Anesthesiology and Critical Care, Hospital de Manises, Manises, Spain
| | - Gerardo Aguilar
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Jesús Villar
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Multidisciplinary Organ Dysfunction Evaluation Research Network, Research Unit, Hospital Universitario Dr. Negrin, Las Palmas de Gran Canaria, Gran Canaria, Spain
- Keenan Research Center for Biomedical Science at the Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Francisco Javier Belda
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| |
Collapse
|
28
|
Ferrando C, Romero C, Tusman G, Suarez-Sipmann F, Canet J, Dosdá R, Valls P, Villena A, Serralta F, Jurado A, Carrizo J, Navarro J, Parrilla C, Romero JE, Pozo N, Soro M, Villar J, Belda FJ. The accuracy of postoperative, non-invasive Air-Test to diagnose atelectasis in healthy patients after surgery: a prospective, diagnostic pilot study. BMJ Open 2017; 7:e015560. [PMID: 28554935 PMCID: PMC5623366 DOI: 10.1136/bmjopen-2016-015560] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVE To assess the diagnostic accuracy of peripheral capillary oxygen saturation (SpO2) while breathing room air for 5 min (the 'Air-Test') in detecting postoperative atelectasis. DESIGN Prospective cohort study. Diagnostic accuracy was assessed by measuring the agreement between the index test and the reference standard CT scan images. SETTING Postanaesthetic care unit in a tertiary hospital in Spain. PARTICIPANTS Three hundred and fifty patients from 12 January to 7 February 2015; 170 patients scheduled for surgery under general anaesthesia who were admitted into the postsurgical unit were included. INTERVENTION The Air-Test was performed in conscious extubated patients after a 30 min stabilisation period during which they received supplemental oxygen therapy via a venturi mask. The Air-Test was defined as positive when SpO2 was ≤96% and negative when SpO2 was ≥97%. Arterial blood gases were measured in all patients at the end of the Air-Test. In the subsequent 25 min, the presence of atelectasis was evaluated by performing a CT scan in 59 randomly selected patients. MAIN OUTCOME MEASURES The primary study outcome was assessment of the accuracy of the Air-Test for detecting postoperative atelectasis compared with the reference standard. The secondary outcome was the incidence of positive Air-Test results. RESULTS The Air-Test diagnosed postoperative atelectasis with an area under the receiver operating characteristic curve of 0.90 (95% CI 0.82 to 0.98) with a sensitivity of 82.6% and a specificity of 87.8%. The presence of atelectasis was confirmed by CT scans in all patients (30/30) with positive and in 5 patients (17%) with negative Air-Test results. Based on the Air-Test, postoperative atelectasis was present in 36% of the patients (62 out of 170). CONCLUSION The Air-Test may represent an accurate, simple, inexpensive and non-invasive method for diagnosing postoperative atelectasis. TRIAL REGISTRATION NCT02650037.
Collapse
Affiliation(s)
- Carlos Ferrando
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Carolina Romero
- Anesthesiology and Critical Care, Consorci Hospital General Universitari de Valencia, Valencia, Spain
| | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | - Fernando Suarez-Sipmann
- Uppsala Universitet, Uppsala, Sweden
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Jaume Canet
- Anesthesiology and Critical Care, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | - Rosa Dosdá
- Department of Radiology, Hospital Clinico Universitario Valencia, Valencia, Spain
| | - Paola Valls
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Abigail Villena
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Ferran Serralta
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Ana Jurado
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Juan Carrizo
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Jose Navarro
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Cristina Parrilla
- Department of Radiology, Hospital Clinico Universitario Valencia, Valencia, Spain
| | - Jose E Romero
- ITACA Institute (Group IBIME), Universidad Politécnica, Valencia, Spain
| | | | - Marina Soro
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| | - Jesús Villar
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Research Unit, Hospital Universitario Dr. Negrin, Las Palmas de Gran Canaria, Spain
| | - Francisco Javier Belda
- Anesthesiology and Critical Care, Hospital Clínico Universitario Valencia, Valencia, Spain
| |
Collapse
|
29
|
Ferrando C, Suarez-Sipmann F, Tusman G, León I, Romero E, Gracia E, Mugarra A, Arocas B, Pozo N, Soro M, Belda FJ. Open lung approach versus standard protective strategies: Effects on driving pressure and ventilatory efficiency during anesthesia - A pilot, randomized controlled trial. PLoS One 2017; 12:e0177399. [PMID: 28493943 PMCID: PMC5426745 DOI: 10.1371/journal.pone.0177399] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 04/24/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Low tidal volume (VT) during anesthesia minimizes lung injury but may be associated to a decrease in functional lung volume impairing lung mechanics and efficiency. Lung recruitment (RM) can restore lung volume but this may critically depend on the post-RM selected PEEP. This study was a randomized, two parallel arm, open study whose primary outcome was to compare the effects on driving pressure of adding a RM to low-VT ventilation, with or without an individualized post-RM PEEP in patients without known previous lung disease during anesthesia. METHODS Consecutive patients scheduled for major abdominal surgery were submitted to low-VT ventilation (6 ml·kg-1) and standard PEEP of 5 cmH2O (pre-RM, n = 36). After 30 min estabilization all patients received a RM and were randomly allocated to either continue with the same PEEP (RM-5 group, n = 18) or to an individualized open-lung PEEP (OL-PEEP) (Open Lung Approach, OLA group, n = 18) defined as the level resulting in maximal Cdyn during a decremental PEEP trial. We compared the effects on driving pressure and lung efficiency measured by volumetric capnography. RESULTS OL-PEEP was found at 8±2 cmH2O. 36 patients were included in the final analysis. When compared with pre-RM, OLA resulted in a 22% increase in compliance and a 28% decrease in driving pressure when compared to pre-RM. These parameters did not improve in the RM-5. The trend of the DP was significantly different between the OLA and RM-5 groups (p = 0.002). VDalv/VTalv was significantly lower in the OLA group after the RM (p = 0.035). CONCLUSIONS Lung recruitment applied during low-VT ventilation improves driving pressure and lung efficiency only when applied as an open-lung strategy with an individualized PEEP in patients without lung diseases undergoing major abdominal surgery. TRIAL REGISTRATION ClinicalTrials.gov NCT02798133.
Collapse
Affiliation(s)
- Carlos Ferrando
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Fernando Suarez-Sipmann
- CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
- Hedenstierna Laboratory, Department of Surgical Sciences, Uppsala University Hospital Uppsala, Sweden
| | - Gerardo Tusman
- Department of Anesthesiology, Hospital Privado de Comunidad, Mar de Plata, Argentina
| | - Irene León
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Esther Romero
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Estefania Gracia
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Ana Mugarra
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Blanca Arocas
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Natividad Pozo
- INCLIVA Clinical Research Institute, Hospital Clínico Universitario, Valencia, Spain
| | - Marina Soro
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| | - Francisco J. Belda
- Department of Anesthesiology and Critical Care, Hospital Clínico Universitario, Valencia, Spain
| |
Collapse
|
30
|
Theerawit P, Sutherasan Y, Ball L, Pelosi P. Respiratory monitoring in adult intensive care unit. Expert Rev Respir Med 2017; 11:453-468. [PMID: 28452241 DOI: 10.1080/17476348.2017.1325324] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION The mortality of patients with respiratory failure has steadily decreased with the advancements in protective ventilation and treatment options. Although respiratory monitoring per se has not been proven to affect the mortality of critically ill patients, it plays a crucial role in patients' care, as it helps to titrate the ventilatory support. Several new monitoring techniques have recently been made available at the bedside. The goals of monitoring comprise alerting physicians to detect the change in the patients' conditions, to improve the understanding of pathophysiology to guide the diagnosis and provide cost-effective clinical management. Areas covered: We performed a review of the recent scientific literature to provide an overview of the different methods used for respiratory monitoring in adult intensive care units, including bedside imaging techniques such as ultrasound and electrical impedance tomography. Expert commentary: Appropriate respiratory monitoring plays an important role in patients with and without respiratory failure as a guiding tool for the optimization of ventilation support, avoiding further complications and decreasing morbidity and mortality. The physician should tailor the monitoring strategy for each individual patient and know how to correctly interpret the data.
Collapse
Affiliation(s)
- Pongdhep Theerawit
- a Division of Pulmonary and Critical Care Medicine, Department of Medicine, Faculty of Medicine Ramathibodi Hospital , Mahidol University , Bangkok , Thailand
| | - Yuda Sutherasan
- a Division of Pulmonary and Critical Care Medicine, Department of Medicine, Faculty of Medicine Ramathibodi Hospital , Mahidol University , Bangkok , Thailand
| | - Lorenzo Ball
- b IRCCS AOU San Martino-IST, Department of Surgical Sciences and Integrated Diagnostics , University of Genoa , Genoa , Italy
| | - Paolo Pelosi
- b IRCCS AOU San Martino-IST, Department of Surgical Sciences and Integrated Diagnostics , University of Genoa , Genoa , Italy
| |
Collapse
|
31
|
[Does intraoperative lung-protective ventilation reduce postoperative pulmonary complications?]. Anaesthesist 2017; 65:573-9. [PMID: 27392439 DOI: 10.1007/s00101-016-0198-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
BACKGROUND Recent studies show that intraoperative protective ventilation is able to reduce postoperative pulmonary complications (PPC). OBJECTIVES This article provides an overview of the definition and ways to predict PPC. We present different factors that lead to ventilator-induced lung injury and explain the concepts of stress and strain as well as driving pressure. Different strategies of mechanical ventilation to avoid PPC are discussed in light of clinical evidence. MATERIALS AND METHODS The Medline database was used to selectively search for randomized controlled trials dealing with intraoperative mechanical ventilation and outcomes. RESULTS Low tidal volumes (VT) and high levels of positive end-expiratory pressure (PEEP), combined with recruitment maneuvers, are able to prevent PPC. Non-obese patients undergoing open abdominal surgery show better lung function with the use of higher PEEP levels and recruitment maneuvers, however such strategy can lead to hemodynamic impairment, while not reducing the incidence of PPC, hospital length of stay and mortality. An increase in the level of PEEP that results in an increase in driving pressure is associated with a greater risk of PPC. CONCLUSIONS The use of intraoperative VT ranging from 6 to 8 ml/kg based on ideal body weight is strongly recommended. Currently, a recommendation regarding the level of PEEP during surgery is not possible. However, a PEEP increase that leads to a rise in driving pressure should be avoided.
Collapse
|
32
|
Tusman G, Bohm SH, Suarez-Sipmann F. Advanced Uses of Pulse Oximetry for Monitoring Mechanically Ventilated Patients. Anesth Analg 2017; 124:62-71. [DOI: 10.1213/ane.0000000000001283] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
33
|
Baikunje N, Sehgal IS, Dhooria S, Prasad KT, Agarwal R. Titration of Ideal Positive End-expiratory Pressure in Acute Respiratory Distress Syndrome: Comparison between Lower Inflection Point and Esophageal Pressure Method Using Volumetric Capnography. Indian J Crit Care Med 2017; 21:322-325. [PMID: 28584436 PMCID: PMC5455026 DOI: 10.4103/ijccm.ijccm_11_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The tenets of mechanical ventilation in acute respiratory distress syndrome (ARDS) include the utilization of low tidal volume and optimal application of positive end-expiratory pressure (PEEP). Optimal PEEP in ARDS is characterized by reduction in alveolar dead space along with improvement in the lung compliance and resultant betterment in oxygenation. There are various methods of setting PEEP in ARDS. Herein, we report a patient of ARDS, wherein we employed measurement of dead space using volumetric capnography to compare two different PEEP strategies, namely, the lower inflection point and transpulmonary pressure monitoring.
Collapse
Affiliation(s)
- Nandakishore Baikunje
- Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Inderpaul Singh Sehgal
- Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Sahajal Dhooria
- Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Kuruswamy Thurai Prasad
- Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Ritesh Agarwal
- Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| |
Collapse
|
34
|
Kinnear W, Watson L, Smith P, Johnson L, Burrows S, Colt J, Sovani M, Khanna A. Effect of expiratory positive airway pressure on tidal volume during non-invasive ventilation. Chron Respir Dis 2016; 14:105-109. [PMID: 27923982 DOI: 10.1177/1479972316674392] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
During non-invasive ventilation (NIV), tidal volume ( Vt) will depend upon the difference between inspiratory and expiratory positive airway pressure (IPAP and EPAP, respectively), provided the respiratory muscles are relaxed and the lungs and chest wall therefore move along their passive pressure-volume curves. To test this hypothesis, we studied the effect of increasing EPAP during pressure-controlled modes of NIV in 30 long-term ventilator users (10 each with scoliosis, obesity hypoventilation or neuromuscular disorders). While maintaining the same IPAP, addition of 5 cmH2O of EPAP reduced mean Vt by 167 ml; 10 cmH2O reduced Vt by 367 ml. This pattern was seen in all three patient groups. EPAP has several potential advantages, for example maintaining upper airway patency, preventing basal atelectasis and facilitating triggering. EPAP does, however, appear to reduce Vt. Decreasing EPAP is an alternative to increasing IPAP if measurements of gas exchange during NIV indicate that ventilation is inadequate.
Collapse
Affiliation(s)
- W Kinnear
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - L Watson
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - P Smith
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - L Johnson
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - S Burrows
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - J Colt
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - M Sovani
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| | - A Khanna
- Gateway B, Nottingham NHS Treatment Centre, Queens Medical Centre, Nottingham, UK
| |
Collapse
|
35
|
Verscheure S, Massion PB, Verschuren F, Damas P, Magder S. Volumetric capnography: lessons from the past and current clinical applications. Crit Care 2016; 20:184. [PMID: 27334879 PMCID: PMC4918076 DOI: 10.1186/s13054-016-1377-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dead space is an important component of ventilation–perfusion abnormalities. Measurement of dead space has diagnostic, prognostic and therapeutic applications. In the intensive care unit (ICU) dead space measurement can be used to guide therapy for patients with acute respiratory distress syndrome (ARDS); in the emergency department it can guide thrombolytic therapy for pulmonary embolism; in peri-operative patients it can indicate the success of recruitment maneuvers. A newly available technique called volumetric capnography (Vcap) allows measurement of physiological and alveolar dead space on a regular basis at the bedside. We discuss the components of dead space, explain important differences between the Bohr and Enghoff approaches, discuss the clinical significance of arterial to end-tidal CO2 gradient and finally summarize potential clinical indications for Vcap measurements in the emergency room, operating room and ICU.
Collapse
Affiliation(s)
- Sara Verscheure
- Department of Critical Care Medicine, University of McGill, Montreal, Quebec, Canada.,Department of General Intensive Care, University Hospital of Liege, Liege, Belgium
| | - Paul B Massion
- Department of General Intensive Care, University Hospital of Liege, Liege, Belgium
| | - Franck Verschuren
- Department of Emergency Medicine, Cliniques universitaire Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Pierre Damas
- Department of General Intensive Care, University Hospital of Liege, Liege, Belgium
| | - Sheldon Magder
- Department of Critical Care Medicine, University of McGill, Montreal, Quebec, Canada.
| |
Collapse
|
36
|
Abstract
PURPOSE OF REVIEW To provide an overview on most recent knowledge on methods currently available for monitoring of recruitment maneuvers at the bedside. RECENT FINDINGS The effects of recruitment maneuvers on clinical outcomes in patients with moderate to severe acute respiratory distress syndrome and in patients with healthy lungs undergoing major surgery were recently assessed. Despite being part of a multifaceted approach of protective ventilation, recruitment maneuvers are supposed to decrease mortality and improve postoperative outcomes. However, the role of recruitment maneuver remains controversial in routine practice owing to concerns regarding complications, especially its effects on hemodynamics. In addition, although recruitment maneuvers are being increasingly used, there remains a great deal of uncertainty regarding the precise way to evaluate the effect of recruitment.An effective recruitment maneuver is expected to reinflate nonaerated lung units. End-expiratory lung volume, compliance, dead space, volumetric capnography, and bedside imaging techniques such as lung ultrasound and electrical impedance tomography have all different strengths and weaknesses. A multimodal and multiparametric approach could be a valuable option for bedside monitoring of recruitment maneuvers both in the ICU and in the operative room. SUMMARY Several methods offer evaluation of lung recruitability and allow the monitoring of positive and negative effects of recruitment maneuvers. More than the type of method used, a multifaceted approach of monitoring of recruitment maneuvers should be regarded.
Collapse
|
37
|
Guay J, Ochroch EA. Intraoperative use of low volume ventilation to decrease postoperative mortality, mechanical ventilation, lengths of stay and lung injury in patients without acute lung injury. Cochrane Database Syst Rev 2015:CD011151. [PMID: 26641378 DOI: 10.1002/14651858.cd011151.pub2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND During the last decade, there has been a trend towards decreasing tidal volumes for positive pressure ventilation during surgery. It is not known whether this new trend is beneficial or harmful for patients. OBJECTIVES To assess the benefit of intraoperative use of low tidal volume ventilation (< 10 mL/kg of predicted body weight) to decrease postoperative complications. SEARCH METHODS We searched the Cochrane Central Register of Controlled Trials (CENTRAL 2014, Issue 9), MEDLINE (OvidSP) (from 1946 to 5 September 2014) and EMBASE (OvidSP) (from 1974 to 5 September 2014). SELECTION CRITERIA We included all parallel randomized controlled trials (RCTs) that evaluated the effect of low tidal volumes (defined as < 10 mL/kg) on any of our selected outcomes in adult participants undergoing any type of surgery. We did not retain studies with participants requiring one-lung ventilation. DATA COLLECTION AND ANALYSIS Two authors independently assessed the quality of the retained studies with the Cochrane 'Risk of bias' tool. We analysed data with both fixed-effect (I(2) statistic < 25%) or random-effects (I(2) statistic > 25%) models based on the degree of heterogeneity. When there was an effect, we calculated a number needed to treat for an additional beneficial outcome (NNTB) using the odds ratio. When there was no effect, we calculated the optimal size information. MAIN RESULTS We included 12 studies in the review. In total these studies detailed 1012 participants (499 participants in the low tidal volume group and 513 in the high volume group). All studies included were at risk of bias as defined by the Cochrane tool. Based on nine studies including 899 participants, we found no difference in 0- to 30-day mortality between low and high tidal volume groups (risk ratio (RR) 0.79, 95% confidence interval (CI) 0.40 to 1.54; I(2) statistic 0%; low quality evidence). Based on four studies including 601 participants undergoing abdominal or spinal surgery, we found a lower incidence of postoperative pneumonia in the lower tidal volume group (RR 0.44, 95% CI 0.20 to 0.99; I(2) statistic 19%; moderate quality evidence; NNTB 19, 95% CI 14 to 169). Based on two studies including 428 participants, low tidal volumes decreased the need for non-invasive postoperative ventilatory support (RR 0.31, 95% CI 0.15 to 0.64; moderate quality evidence; NNTB 11, 95% CI 9 to 19). Based on eight studies including 814 participants, low tidal volumes during surgery decreased the need for postoperative invasive ventilatory support (RR 0.33, 95% CI 0.14 to 0.80; I(2) statistic 0%; NNTB 36, 95% CI 27 to 202; moderate quality evidence). Based on three studies including 650 participants, we found no difference in the intensive care unit length of stay (standardized mean difference (SMD) -0.01, 95% CI -0.22 to 0.20; I(2) statistic = 42%; moderate quality evidence). Based on eight studies including 846 participants, we did not find a difference in hospital length of stay (SMD -0.16, 95% CI -0.40 to 0.07; I(2) statistic 52%; moderate quality evidence). A meta-regression showed that the effect size increased proportionally to the peak pressure measured at the end of surgery in the high volume group. We did not find a difference in the risk of pneumothorax (RR 2.01, 95% CI 0.51 to 7.95; I(2) statistic 0%; low quality evidence). AUTHORS' CONCLUSIONS Low tidal volumes (defined as < 10 mL/kg) should be used preferentially during surgery. They decrease the need for postoperative ventilatory support (invasive and non-invasive). Further research is required to determine the maximum peak pressure of ventilation that should be allowed during surgery.
Collapse
Affiliation(s)
- Joanne Guay
- Department of Anesthesiology, Faculty of Medicine, University of Sherbrooke, Sherbrooke, QC, Canada
| | | |
Collapse
|
38
|
Intraoperative protective mechanical ventilation for prevention of postoperative pulmonary complications: a comprehensive review of the role of tidal volume, positive end-expiratory pressure, and lung recruitment maneuvers. Anesthesiology 2015; 123:692-713. [PMID: 26120769 DOI: 10.1097/aln.0000000000000754] [Citation(s) in RCA: 244] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Postoperative pulmonary complications are associated with increased morbidity, length of hospital stay, and mortality after major surgery. Intraoperative lung-protective mechanical ventilation has the potential to reduce the incidence of postoperative pulmonary complications. This review discusses the relevant literature on definition and methods to predict the occurrence of postoperative pulmonary complication, the pathophysiology of ventilator-induced lung injury with emphasis on the noninjured lung, and protective ventilation strategies, including the respective roles of tidal volumes, positive end-expiratory pressure, and recruitment maneuvers. The authors propose an algorithm for protective intraoperative mechanical ventilation based on evidence from recent randomized controlled trials.
Collapse
|
39
|
Abstract
PURPOSE OF REVIEW Describe the importance of monitoring dead space during thoracic surgery, specifically during one-lung ventilation. RECENT FINDINGS The concept of dead space has gained renewed interest among anesthesiologists ever since breath-by-breath measurement by volumetric capnography became available. Monitoring dead space during thoracic surgery assesses the ventilatory deficiencies related to increases in instrumental, airway and/or alveolar dead space, when ventilating patients with positive pressure and double-lumen tubes. Another interesting use of such monitoring is to detect ventilator-induced lung injury due to tidal overdistension. This type of injury threatens the fragile lungs especially during one-lung ventilation and can clinically be recognized as an increase in airway and alveolar dead space above normal values. To date, lung protective ventilation is based on the use of low tidal volumes and airway pressures to decrease overdistension. It has been shown to reduce the incidence of postoperative pulmonary complications after thoracic surgeries. However, such a ventilatory strategy impairs ventilation and induces hypercapnia due to increases in dead space. Therefore, continuous assessment of dead space is helpful in guiding ventilation and avoiding overdistension while maintaining the elimination of CO(2) during thoracic surgery sufficiently high. SUMMARY Monitoring dead space helps anesthesiologists monitor the status of the lung and find appropriate ventilatory settings during thoracic surgeries.
Collapse
|
40
|
Abstract
PURPOSE OF REVIEW Volumetric capnography (VCap) measures the kinetics of carbon dioxide (CO2) elimination on a breath-by-breath basis. A volumetric capnogram contains extensive physiological information about metabolic production, circulatory transport and CO2 elimination within the lungs. VCap is also the best clinical tool to measure dead spaces allowing a detailed analysis of the functional components of each tidal volume, thereby providing clinically useful hints about the lung's efficiency of gas exchange. Difficulties in its bedside measurement, oversimplifications of its interpretation along with prevailing misconceptions regarding dead space analysis have, however, limited its adoption as a routine tool for monitoring mechanically ventilated patients. RECENT FINDINGS Improvements in CO2 measuring technologies and more advanced algorithms for faster and more accurate analysis of volumetric capnograms have increased our physiological understanding and thus the clinical usefulness of VCap. The recently validated VCap-based method for estimating alveolar partial pressure of CO2 provided a breakthrough for a fully noninvasive breath-by-breath measurement of physiological dead space. SUMMARY Recent advances in VCap and our improved understanding of its clinical implications may help in overcoming the known limitations and reluctances to include expired CO2 kinetics and dead space analysis in routine bedside monitoring. It is about time to start using this powerful monitoring tool to support decision making in the intensive care environment.
Collapse
|
41
|
|
42
|
Restrepo RD, Nuccio P, Spratt G, Waugh J. Current applications of capnography in non-intubated patients. Expert Rev Respir Med 2014; 8:629-39. [PMID: 25020234 DOI: 10.1586/17476348.2014.940321] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Current clinical guidelines recommend capnography as one of the best non-invasive methods to assess adequacy of ventilation in the non-intubated patient. Alveolar hypoventilation or respiratory depression is a serious event that occurs in a variety of clinical settings where patients receive sedatives and opioids. With the large number of procedures performed outside the operating room under the effects of sedatives and the increased use of patient-controlled analgesia, the need for capnography for monitoring has dramatically increased. Despite the succesful use of capnography to monitor ventilation in the operating room over several decades, other clinical areas have been very slow adapters of the technology and still rely heavily upon pulse oximetry to detect hypoventilation. This article reviews the most current evidence for using capnography in the non-intubated patient and summarizes the results of outcome measures reported in recent clinical trials. Capnography should be routinely used for non-intubated patients at risk for respiratory depression, in particular those receiving supplemental oxygen.
Collapse
Affiliation(s)
- Ruben D Restrepo
- Department of Respiratory Care, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr, San Antonio, TX 78229, USA
| | | | | | | |
Collapse
|
43
|
Nguyen DN, Guay J, Ochroch EA. Intraoperative use of low volume ventilation to decrease postoperative mortality, mechanical ventilation, lengths of stay and lung injury in patients without acute lung injury. THE COCHRANE DATABASE OF SYSTEMATIC REVIEWS 2014. [DOI: 10.1002/14651858.cd011151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
44
|
Nabiev FK, Dobrodeev AS, Libin PV, Kotov II. [Diagnostics and treatment of patients with II class malocclusion associated with obstructive sleep apnea syndrome]. STOMATOLOGIIA 2014; 93:74-77. [PMID: 25786270 DOI: 10.17116/stomat201493674-77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- F Kh Nabiev
- Tsentral'nyĭ nauchno-issledovatel'skiĭ institut stomatologii i cheliustno-litsevoĭ khirurgii Minzdrava RF, Moskva
| | - A S Dobrodeev
- Tsentral'nyĭ nauchno-issledovatel'skiĭ institut stomatologii i cheliustno-litsevoĭ khirurgii Minzdrava RF, Moskva
| | - P V Libin
- Tsentral'nyĭ nauchno-issledovatel'skiĭ institut stomatologii i cheliustno-litsevoĭ khirurgii Minzdrava RF, Moskva
| | - I I Kotov
- Tsentral'nyĭ nauchno-issledovatel'skiĭ institut stomatologii i cheliustno-litsevoĭ khirurgii Minzdrava RF, Moskva
| |
Collapse
|