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Pendleton KM, Fiocchi J, Meyer J, Fuher A, Green S, LeTourneau WM, Reilkoff RA. High PEEP extubation as guided by esophageal manometry. Respir Med Case Rep 2024; 48:101985. [PMID: 38357549 PMCID: PMC10865048 DOI: 10.1016/j.rmcr.2024.101985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/07/2024] [Accepted: 01/11/2024] [Indexed: 02/16/2024] Open
Abstract
The ventilatory management of morbidly obese patients presents an ongoing challenge in the Intensive Care Unit (ICU) as multiple physiologic changes in the respiratory system complicate weaning efforts and make extubation more difficult, often leading to increased time on the ventilator. We report the case of a young adult male who presented to our ICU on two separate occasions with hypoxemic respiratory failure requiring intubation. Esophageal manometry (EM) guided positive end expiratory pressure (PEEP) titration was utilized during both ICU admissions to improve oxygenation and aid in extubation with spontaneous breathing trials performed on higher-than-normal PEEP settings and successful liberation on both occasions.
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Affiliation(s)
- Kathryn M. Pendleton
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Jacob Fiocchi
- Department of Internal Medicine, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Julia Meyer
- University of Minnesota Medical School, University of Minnesota, Minneapolis, MN, USA
| | - Alexandra Fuher
- University of Minnesota Medical School, University of Minnesota, Minneapolis, MN, USA
| | - Sarah Green
- MHealth-Fairview Southdale Hospital, Edina, MN, USA
| | - William M. LeTourneau
- Department of Anesthesiology and Perioperative Medicine, Respiratory Therapy, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - Ronald A. Reilkoff
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Minnesota Medical School, Minneapolis, MN, USA
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Firstiogusran AMF, Yoshida T, Hashimoto H, Iwata H, Fujino Y. Positive end-expiratory pressure and prone position alter the capacity of force generation from diaphragm in acute respiratory distress syndrome: an animal experiment. BMC Anesthesiol 2022; 22:373. [PMID: 36460946 PMCID: PMC9716689 DOI: 10.1186/s12871-022-01921-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 08/03/2022] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Spontaneous breathing potentially injures lungs and diaphragm when spontaneous effort is vigorous in acute respiratory distress syndrome (ARDS) while immobility also has risks of Intensive Care Unit (ICU) acquired weakness and diaphragm atrophy. Thus, ventilatory strategy to mitigate strong spontaneous effort should be promptly established without a systemic use of neuromuscular blocking agent. Here, we investigated the impacts of positive end-expiratory pressure (PEEP) and body position on the capacity of force generation from diaphragm following bilateral phrenic nerve stimulations in a rabbit ARDS model. METHODS Using lung-injured rabbits, we measured 1) transdiaphragmatic pressure by bilateral phrenic nerve stimulation and 2) end-expiratory lung volume using computed tomography, under two different levels of PEEP (high, low) and body positions (supine, prone). RESULTS Overall, transdiaphragmatic pressure was the highest at low PEEP in supine position and the lowest at high PEEP in prone position. Compared to values in low PEEP + supine, transdiaphragmatic pressure was significantly reduced by either prone alone (the same PEEP) or increasing PEEP alone (the same position) or both combinations. End-expiratory lung volume was significantly increased with increasing PEEP in both positions, but it was not altered by body position. INTERPRETATION The capacity of force generation from diaphragm was modulated by PEEP and body position during mechanical ventilation in ARDS. Higher PEEP or prone position per se or both was effective to decrease the force generation from diaphragm.
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Affiliation(s)
- Andi Muhammad Fadlillah Firstiogusran
- grid.136593.b0000 0004 0373 3971The Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Takeshi Yoshida
- grid.136593.b0000 0004 0373 3971The Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan ,Osaka, Japan
| | - Haruka Hashimoto
- grid.136593.b0000 0004 0373 3971The Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hirofumi Iwata
- grid.136593.b0000 0004 0373 3971The Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Yuji Fujino
- grid.136593.b0000 0004 0373 3971The Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan
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Pérez J, Dorado JH, Navarro E, Morais CCA, Accoce M. Mechanisms of lung and diaphragmatic protection by high PEEP in obese COVID-19 ARDS: role of the body mass index. Crit Care 2022; 26:182. [PMID: 35715863 PMCID: PMC9205142 DOI: 10.1186/s13054-022-04051-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/07/2022] [Indexed: 11/10/2022] Open
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Florio G, Imber DA, Berra L. A Physiological Hypothesis to Support the Use of Continuous Positive Airway Pressure at Extubation among Patients with Obesity. Am J Respir Crit Care Med 2022; 205:854-855. [PMID: 35134319 PMCID: PMC9836214 DOI: 10.1164/rccm.202112-2706le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
- Gaetano Florio
- Massachusetts General HospitalBoston, Massachusetts,Harvard Medical SchoolBoston, Massachusetts
| | - David A. Imber
- Massachusetts General HospitalBoston, Massachusetts,Harvard Medical SchoolBoston, Massachusetts
| | - Lorenzo Berra
- Massachusetts General HospitalBoston, Massachusetts,Harvard Medical SchoolBoston, Massachusetts,Corresponding author (e-mail: )
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5
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Thille AW, Coudroy R, Frat JP, Ragot S. Reply to Florio et al.: A Physiological Hypothesis to Support the Use of Continuous Positive Airway Pressure at Extubation among Patients with Obesity. Am J Respir Crit Care Med 2022; 205:855-856. [PMID: 35134310 PMCID: PMC9836217 DOI: 10.1164/rccm.202112-2776le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
- Arnaud W. Thille
- Centre Hospitalier Universitaire de PoitiersPoitiers, France,Université de PoitiersPoitiers, France,Corresponding author (e-mail: )
| | - Rémi Coudroy
- Centre Hospitalier Universitaire de PoitiersPoitiers, France,Université de PoitiersPoitiers, France
| | - Jean-Pierre Frat
- Centre Hospitalier Universitaire de PoitiersPoitiers, France,Université de PoitiersPoitiers, France
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Prone Position Minimizes the Exacerbation of Effort-dependent Lung Injury: Exploring the Mechanism in Pigs and Evaluating Injury in Rabbits. Anesthesiology 2022; 136:779-791. [PMID: 35303058 DOI: 10.1097/aln.0000000000004165] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Vigorous spontaneous effort can potentially worsen lung injury. This study hypothesized that the prone position would diminish a maldistribution of lung stress and inflation after diaphragmatic contraction and reduce spontaneous effort, resulting in less lung injury. METHODS A severe acute respiratory distress syndrome model was established by depleting surfactant and injurious mechanical ventilation in 6 male pigs ("mechanism" protocol) and 12 male rabbits ("lung injury" protocol). In the mechanism protocol, regional inspiratory negative pleural pressure swing (intrabronchial balloon manometry) and the corresponding lung inflation (electrical impedance tomography) were measured with a combination of position (supine or prone) and positive end-expiratory pressure (high or low) matching the intensity of spontaneous effort. In the lung injury protocol, the intensities of spontaneous effort (esophageal manometry) and regional lung injury were compared in the supine position versus prone position. RESULTS The mechanism protocol (pigs) found that in the prone position, there was no ventral-to-dorsal gradient in negative pleural pressure swing after diaphragmatic contraction, irrespective of the positive end-expiratory pressure level (-10.3 ± 3.3 cm H2O vs. -11.7 ± 2.4 cm H2O at low positive end-expiratory pressure, P = 0.115; -10.4 ± 3.4 cm H2O vs. -10.8 ± 2.3 cm H2O at high positive end-expiratory pressure, P = 0.715), achieving homogeneous inflation. In the supine position, however, spontaneous effort during low positive end-expiratory pressure had the largest ventral-to-dorsal gradient in negative pleural pressure swing (-9.8 ± 2.9 cm H2O vs. -18.1 ± 4.0 cm H2O, P < 0.001), causing dorsal overdistension. Higher positive end-expiratory pressure in the supine position reduced a ventral-to-dorsal gradient in negative pleural pressure swing, but it remained (-9.9 ± 2.8 cm H2O vs. -13.3 ± 2.3 cm H2O, P < 0.001). The lung injury protocol (rabbits) found that in the prone position, spontaneous effort was milder and lung injury was less without regional difference (lung myeloperoxidase activity in ventral vs. dorsal lung, 74.0 ± 30.9 μm · min-1 · mg-1 protein vs. 61.0 ± 23.0 μm · min-1 · mg-1 protein, P = 0.951). In the supine position, stronger spontaneous effort increased dorsal lung injury (lung myeloperoxidase activity in ventral vs. dorsal lung, 67.5 ± 38.1 μm · min-1 · mg-1 protein vs. 167.7 ± 65.5 μm · min-1 · mg-1 protein, P = 0.003). CONCLUSIONS Prone position, independent of positive end-expiratory pressure levels, diminishes a maldistribution of lung stress and inflation imposed by spontaneous effort and mitigates spontaneous effort, resulting in less effort-dependent lung injury. EDITOR’S PERSPECTIVE
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Singh P, Liew W, Negar A. Airway management in patients suffering from morbid obesity. Saudi J Anaesth 2022; 16:314-321. [PMID: 35898526 PMCID: PMC9311184 DOI: 10.4103/sja.sja_90_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/01/2022] [Accepted: 02/03/2022] [Indexed: 11/04/2022] Open
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8
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Grieco DL, Jaber S. Pre-Emptive Noninvasive Ventilation to Facilitate Weaning from Mechanical Ventilation in Obese Patients at High Risk of Re-Intubation. Am J Respir Crit Care Med 2021; 205:382-383. [PMID: 34910895 DOI: 10.1164/rccm.202111-2649ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Domenico Luca Grieco
- Fondazione Policlinico Universitario Agostino Gemelli IRCCS, 18654, Anesthesiology and Intensive Care Medicine, Roma, Italy.,Università Cattolica del Sacro Cuore Facoltà di Medicina e Chirurgia, 60234, Anesthesia, Emergency and Intensive care medicine, Roma, Italy;
| | - Samir Jaber
- University hospital. CHU de MONTPELLIER HOPITAL SAINT ELOI, Intensive Care Unit and transplantation-Departement of Anesthesiology DAR B, Montpellier Cedex 5, France
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Abstract
PURPOSE OF REVIEW Obesity prevalence is increasing in most countries in the world. In the United States, 42% of the population is obese (body mass index (BMI) > 30) and 9.2% is obese class III (BMI > 40). One of the greatest challenges in critically ill patients with obesity is the optimization of mechanical ventilation. The goal of this review is to describe respiratory physiologic changes in patients with obesity and discuss possible mechanical ventilation strategies to improve respiratory function. RECENT FINDINGS Individualized mechanical ventilation based on respiratory physiology after a decremental positive end-expiratory pressure (PEEP) trial improves oxygenation and respiratory mechanics. In a recent study, mortality of patients with respiratory failure and obesity was reduced by about 50% when mechanical ventilation was associated with the use of esophageal manometry and electrical impedance tomography (EIT). SUMMARY Obesity greatly alters the respiratory system mechanics causing atelectasis and prolonged duration of mechanical ventilation. At present, novel strategies to ventilate patients with obesity based on individual respiratory physiology showed to be superior to those based on standard universal tables of mechanical ventilation. Esophageal manometry and EIT are essential tools to systematically assess respiratory system mechanics, safely adjust relatively high levels of PEEP, and improve chances for successful weaning.
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Florio G, De Santis Santiago RR, Fumagalli J, Imber DA, Marrazzo F, Sonny A, Bagchi A, Fitch AK, Anekwe CV, Amato MBP, Arora P, Kacmarek RM, Berra L. Pleural Pressure Targeted Positive Airway Pressure Improves Cardiopulmonary Function in Spontaneously Breathing Patients With Obesity. Chest 2021; 159:2373-2383. [PMID: 34099131 DOI: 10.1016/j.chest.2021.01.055] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/13/2021] [Accepted: 01/16/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Increased pleural pressure affects the mechanics of breathing of people with class III obesity (BMI > 40 kg/m2). RESEARCH QUESTION What are the acute effects of CPAP titrated to match pleural pressure on cardiopulmonary function in spontaneously breathing patients with class III obesity? STUDY DESIGN AND METHODS We enrolled six participants with BMI within normal range (control participants, group I) and 12 patients with class III obesity (group II) divided into subgroups: IIa, BMI of 40 to 50 kg/m2; and IIb, BMI of ≥ 50 kg/m2. The study was performed in two phases: in phase 1, participants were supine and breathing spontaneously at atmospheric pressure, and in phase 2, participants were supine and breathing with CPAP titrated to match their end-expiratory esophageal pressure in the absence of CPAP. Respiratory mechanics, esophageal pressure, and hemodynamic data were collected, and right heart function was evaluated by transthoracic echocardiography. RESULTS The levels of CPAP titrated to match pleural pressure in group I, subgroup IIa, and subgroup IIb were 6 ± 2 cmH2O, 12 ± 3 cmH2O, and 18 ± 4 cmH2O, respectively. In both subgroups IIa and IIb, CPAP titrated to match pleural pressure decreased minute ventilation (IIa, P = .03; IIb, P = .03), improved peripheral oxygen saturation (IIa, P = .04; IIb, P = .02), improved homogeneity of tidal volume distribution between ventral and dorsal lung regions (IIa, P = .22; IIb, P = .03), and decreased work of breathing (IIa, P < .001; IIb, P = .003) with a reduction in both the work spent to initiate inspiratory flow as well as tidal ventilation. In five hypertensive participants with obesity, BP decreased to normal range, without impairment of right heart function. INTERPRETATION In ambulatory patients with class III obesity, CPAP titrated to match pleural pressure decreased work of breathing and improved respiratory mechanics while maintaining hemodynamic stability, without impairing right heart function. TRIAL REGISTRY ClinicalTrials.gov; No.: NCT02523352; URL: www.clinicaltrials.gov.
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Affiliation(s)
- Gaetano Florio
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | | | - Jacopo Fumagalli
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - David A Imber
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Francesco Marrazzo
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Abraham Sonny
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Aranya Bagchi
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Angela K Fitch
- Weight Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Chika V Anekwe
- Weight Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Marcelo Britto Passos Amato
- Pulmonary Division, Cardio-Pulmonary Department, Heart Institute (Incor), Hospital Das Clinicas da FMUSP, University of São Paulo, São Paulo, Brazil
| | - Pankaj Arora
- Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL
| | - Robert M Kacmarek
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA; Department of Respiratory Care, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Lorenzo Berra
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA; Department of Respiratory Care, Massachusetts General Hospital and Harvard Medical School, Boston, MA.
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11
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Goligher EC, Jonkman AH, Dianti J, Vaporidi K, Beitler JR, Patel BK, Yoshida T, Jaber S, Dres M, Mauri T, Bellani G, Demoule A, Brochard L, Heunks L. Clinical strategies for implementing lung and diaphragm-protective ventilation: avoiding insufficient and excessive effort. Intensive Care Med 2020; 46:2314-2326. [PMID: 33140181 PMCID: PMC7605467 DOI: 10.1007/s00134-020-06288-9] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/08/2020] [Indexed: 12/12/2022]
Abstract
Mechanical ventilation may have adverse effects on both the lung and the diaphragm. Injury to the lung is mediated by excessive mechanical stress and strain, whereas the diaphragm develops atrophy as a consequence of low respiratory effort and injury in case of excessive effort. The lung and diaphragm-protective mechanical ventilation approach aims to protect both organs simultaneously whenever possible. This review summarizes practical strategies for achieving lung and diaphragm-protective targets at the bedside, focusing on inspiratory and expiratory ventilator settings, monitoring of inspiratory effort or respiratory drive, management of dyssynchrony, and sedation considerations. A number of potential future adjunctive strategies including extracorporeal CO2 removal, partial neuromuscular blockade, and neuromuscular stimulation are also discussed. While clinical trials to confirm the benefit of these approaches are awaited, clinicians should become familiar with assessing and managing patients’ respiratory effort, based on existing physiological principles. To protect the lung and the diaphragm, ventilation and sedation might be applied to avoid excessively weak or very strong respiratory efforts and patient-ventilator dysynchrony.
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Affiliation(s)
- Ewan C Goligher
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada.,Department of Medicine, Division of Respirology, University Health Network, Toronto, Canada.,Toronto General Hospital Research Institute, Toronto, Canada
| | - Annemijn H Jonkman
- Department of Intensive Care, Amsterdam UMC, Location VUmc, De Boelelaan 1117, 1081 HV, Amsterdam, the Netherlands.,Keenan Centre for Biomedical Research, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
| | - Jose Dianti
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada.,Department of Medicine, Division of Respirology, University Health Network, Toronto, Canada
| | - Katerina Vaporidi
- Department of Intensive Care Medicine, University Hospital of Heraklion, Medical School, University of Crete, Heraklion, Greece
| | - Jeremy R Beitler
- Center for Acute Respiratory Failure, Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Bhakti K Patel
- Department of Medicine, Section of Pulmonary and Critical Care, University of Chicago, Chicago, IL, USA
| | - Takeshi Yoshida
- Department of Anesthesiology and Intensive Care Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Samir Jaber
- Critical Care and Anesthesia Department (DAR B), Hôpital Saint-Éloi, CHU de Montpellier, PhyMedExp, Université de Montpellier, Montpellier, France
| | - Martin Dres
- Sorbonne Université, INSERM, UMRS1158 Neurophysiologie Respiratoire Expérimentale et Clinique, 75005, Paris, France.,Service de Pneumologie, Médecine Intensive et Réanimation (Département R3S), AP-HP, Groupe Hospitalier Universitaire APHP-Sorbonne Université, Site Pitié-Salpêtrière, 75013, Paris, France
| | - Tommaso Mauri
- Department of Anesthesiology, Intensive Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Giacomo Bellani
- Department of Medicine and Surgery, University of Milan-Bicocca, Via Cadore 48, Monza, MB, Italy
| | - Alexandre Demoule
- Sorbonne Université, INSERM, UMRS1158 Neurophysiologie Respiratoire Expérimentale et Clinique, 75005, Paris, France.,Service de Pneumologie, Médecine Intensive et Réanimation (Département R3S), AP-HP, Groupe Hospitalier Universitaire APHP-Sorbonne Université, Site Pitié-Salpêtrière, 75013, Paris, France
| | - Laurent Brochard
- Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada.,Keenan Centre for Biomedical Research, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada
| | - Leo Heunks
- Department of Intensive Care, Amsterdam UMC, Location VUmc, De Boelelaan 1117, 1081 HV, Amsterdam, the Netherlands.
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12
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Fiala JA, Coleman JM. Tailoring the Sleep Laboratory for Chronic Respiratory Failure. Sleep Med Clin 2020; 15:557-568. [PMID: 33131665 DOI: 10.1016/j.jsmc.2020.08.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
"Many seemingly mundane aspects of the sleep laboratory can have outsized effects on the quality of polysomnographic data obtained from, and care provided to, patients. This is particularly true when performing polysomnography on patients with chronic respiratory failure due to various causes. This article uses a disease-based approach to review physical and protocol-based accommodations that should be considered when performing polysomnography on this patient population."
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Affiliation(s)
- Justin A Fiala
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, 676 North Street Clair Street, Suite 1400, Chicago, IL 60611, USA
| | - John M Coleman
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, 676 North Street Clair Street, Suite 1400, Chicago, IL 60611, USA.
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13
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Coppadoro A, Grassi A, Giovannoni C, Rabboni F, Eronia N, Bronco A, Foti G, Fumagalli R, Bellani G. Occurrence of pendelluft under pressure support ventilation in patients who failed a spontaneous breathing trial: an observational study. Ann Intensive Care 2020; 10:39. [PMID: 32266600 PMCID: PMC7138895 DOI: 10.1186/s13613-020-00654-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 03/23/2020] [Indexed: 11/23/2022] Open
Abstract
Background Pendelluft, the movement of gas within different lung regions, is present in animal models of assisted mechanical ventilation and associated with lung overstretching. Due to rebreathing of CO2 as compared to fresh gas, pendelluft might reduce ventilatory efficiency possibly exacerbating patient’s respiratory workload during weaning. Our aim was to measure pendelluft by electrical impedance tomography (EIT) in patients who failed a spontaneous breathing trial (SBT). Methods This is an observational study conducted in a general intensive care unit of a tertiary-level teaching hospital. EIT signal was recorded in 20 patients while pressure support (PS) ventilation was progressively reduced from clinical level (baseline) to 2 cmH2O, as in an SBT; four ventral-to-dorsal lung regions of interest were identified for pendelluft measurement. A regional gas movement (> 6 mL) occurring in a direction opposite to the global EIT signal was considered diagnostic for high pendelluft. Results Eight patients out of 20 (40%) were classified as high-pendelluft; baseline clinical characteristics did not differ between high- and low-pendelluft patients. At PS reduction, pendelluft and EtCO2 increased more in the high-pendelluft group (p < .001 and .011, respectively). The volume of gas subject to pendelluft moved almost completely from the ventral towards the dorsal lung regions, while the opposite movement was minimal (16.3 [10:32.8] vs. 0 [0:1.8] mL, p = .001). In a subgroup of patients, increased pendelluft volumes positively correlated with markers of respiratory distress such as increased respiratory rate, p0.1, and EtCO2. Conclusions Occult pendelluft can be measured by EIT, and is frequently present in patients failing an SBT. When present, pendelluft increases with the reduction of ventilator support and is associated with increased EtCO2, suggesting a reduction of the ability to eliminate CO2.
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Affiliation(s)
- Andrea Coppadoro
- Department of Anesthesia and Intensive Care, San Gerardo Hospital, Monza, Italy
| | - Alice Grassi
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Cecilia Giovannoni
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Francesca Rabboni
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Nilde Eronia
- Department of Anesthesia and Intensive Care, San Gerardo Hospital, Monza, Italy
| | - Alfio Bronco
- Department of Anesthesia and Intensive Care, San Gerardo Hospital, Monza, Italy
| | - Giuseppe Foti
- Department of Anesthesia and Intensive Care, San Gerardo Hospital, Monza, Italy.,School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Roberto Fumagalli
- School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Giacomo Bellani
- Department of Anesthesia and Intensive Care, San Gerardo Hospital, Monza, Italy. .,School of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy.
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14
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Patient self-inflicted lung injury and positive end-expiratory pressure for safe spontaneous breathing. Curr Opin Crit Care 2020; 26:59-65. [DOI: 10.1097/mcc.0000000000000691] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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[The obese patient and acute respiratory failure, a challenge for intensive care]. Rev Mal Respir 2019; 36:971-984. [PMID: 31521432 DOI: 10.1016/j.rmr.2018.10.621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Accepted: 10/16/2018] [Indexed: 11/24/2022]
Abstract
As a result of the constantly increasing epidemic of obesity, it has become a common problem in the intensive care unit. Morbid obesity has numerous consequences for the respiratory system. It affects both respiratory mechanics and pulmonary gas exchange, and dramatically impacts on the patient's management and outcome. With the potential for causing devastating respiratory complications, the particular anatomical and physiological characteristics of the respiratory system of the morbidly obese subject should be carefully taken into consideration. The present article reviews the management of obese patients in respiratory failure, from noninvasive ventilation to tracheostomy, including postural and technical issues, and explains the physiologically based ventilatory strategy both for NIV and invasive mechanical ventilation up to the weaning from the ventilatory support.
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