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Kaminsky DA. Oscillometry in Respiratory Failure: A Unique Window Into Underlying Pathophysiology. Respir Care 2025; 70:349-351. [PMID: 39969934 DOI: 10.1089/respcare.12662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2025]
Affiliation(s)
- David A Kaminsky
- Prof. Kaminsky is affiliated with Pulmonary Disease and Critical Care Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
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Ponomarev D, Wu JKY, Hantos Z, Chow CW, Goligher E. Respiratory Oscillometry in Patients With Acute Hypoxemic Respiratory Failure. Respir Care 2025; 70:227-232. [PMID: 39472068 DOI: 10.4187/respcare.12285] [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: 01/18/2025]
Abstract
Background: Assessing respiratory mechanics in patients with acute hypoxemic respiratory failure who are not intubated could provide useful information about illness trajectory. Oscillometry is a respiratory function test used to measure total respiratory impedance during tidal breathing, which reveals resistive and elastic properties of the lung. This study assessed the feasibility of oscillometry in patients with acute hypoxemic respiratory failure and described their respiratory mechanics. Methods: Adult participants with acute hypoxemic respiratory failure who were receiving noninvasive respiratory support with F IO 2 ≥0.4 and flow ≥6 L/min underwent oscillometry at baseline and after resolution of acute hypoxemic respiratory failure. The primary end point was the number of participants who completed the baseline measurement. The feasibility criterion was in obtaining baseline oscillometry measurements in ≥80% of enrolled participants. Results: Of 183 patients screened between July 2022 and August 2023, 29% were unable to cooperate due to altered mental state, 20% with extreme hypoxemia were excluded because of clinical instability, and 12% declined participation. Of the 10 participants (5.4%) recruited, all tolerated oscillometry measurements. At baseline, the median (minimum, maximum) F IO 2 was 0.8 (0.4, 0.8), median oxygen saturation of 94% dropped to a nadir of 82% at the end of oscillometry and recovered within 2 min. Lung reactance was increased, with a reactance area of 25 (15-32) cm H2O/L. Hypoxemia resolved in 9 participants. After resolution of acute hypoxemic respiratory failure in 8 (6-16) d, the median reactance area dropped to 15 (14-19) cm H2O/L. Conclusions: Respiratory mechanics in the participants with acute hypoxemic respiratory failure who were not intubated could be assessed by oscillometry in carefully selected cases.
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Affiliation(s)
- Dmitry Ponomarev
- Drs. Ponomarev and Goligher are affiliated with the Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Ontario, Canada
- Dr. Ponomarev is affiliated with the Intensive Care Unit, Liverpool Hospital, Sydney, New South Wales, Australia
| | - Joyce K Y Wu
- Ms. Wu and Dr. Chow are affiliated with the Division of Respirology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Ms. Wu and Dr. Chow are affiliated with the Toronto General Pulmonary Function Laboratory, University Health Network, Toronto, Ontario, Canada
| | - Zoltán Hantos
- Dr. Hantos is affiliated with the Department of Anesthesiology and Intensive Therapy, Semmelweis University, Budapest, Hungary
| | - Chung-Wai Chow
- Ms. Wu and Dr. Chow are affiliated with the Division of Respirology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Ms. Wu and Dr. Chow are affiliated with the Toronto General Pulmonary Function Laboratory, University Health Network, Toronto, Ontario, Canada
| | - Ewan Goligher
- Drs. Ponomarev and Goligher are affiliated with the Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Ontario, Canada
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Lee KG, Roca O, Casey JD, Semler MW, Roman-Sarita G, Yarnell CJ, Goligher EC. When to intubate in acute hypoxaemic respiratory failure? Options and opportunities for evidence-informed decision making in the intensive care unit. THE LANCET. RESPIRATORY MEDICINE 2024; 12:642-654. [PMID: 38801827 DOI: 10.1016/s2213-2600(24)00118-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/08/2024] [Accepted: 04/05/2024] [Indexed: 05/29/2024]
Abstract
The optimal timing of intubation in acute hypoxaemic respiratory failure is uncertain and became a point of controversy during the COVID-19 pandemic. Invasive mechanical ventilation is a potentially life-saving intervention but carries substantial risks, including injury to the lungs and diaphragm, pneumonia, intensive care unit-acquired muscle weakness, and haemodynamic impairment. In deciding when to intubate, clinicians must balance premature exposure to the risks of ventilation with the potential harms of unassisted breathing, including disease progression and worsening multiorgan failure. Currently, the optimal timing of intubation is unclear. In this Personal View, we examine a range of parameters that could serve as triggers to initiate invasive mechanical ventilation. The utility of a parameter (eg, the ratio of arterial oxygen tension to fraction of inspired oxygen) to predict the likelihood of a patient undergoing intubation does not necessarily mean that basing the timing of intubation on that parameter will improve therapeutic outcomes. We examine options for clinical investigation to make progress on establishing the optimal timing of intubation.
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Affiliation(s)
- Kevin G Lee
- Department of Physiology, Toronto, ON, Canada; Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Oriol Roca
- Servei de Medicina Intensiva, Parc Taulí Hospital Universitari, Institut de Recerca Parc Taulí-I3PT, Sabadell, Spain; Departament de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain; Ciber Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Jonathan D Casey
- Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Matthew W Semler
- Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | | | - Christopher J Yarnell
- Interdepartmental Division of Critical Care Medicine University of Toronto, Toronto, ON, Canada; Department of Medicine, Division of Respirology, University Health Network, Toronto, ON, Canada; Institute of Health Policy, Management, and Evaluation at the University of Toronto, Toronto, ON, Canada; Scarborough Health Network, Department of Critical Care Medicine, Toronto, ON, Canada; Scarborough Health Network Research Institute, Toronto, ON, Canada.
| | - Ewan C Goligher
- Department of Physiology, Toronto, ON, Canada; Interdepartmental Division of Critical Care Medicine University of Toronto, Toronto, ON, Canada; Department of Medicine, Division of Respirology, University Health Network, Toronto, ON, Canada; Toronto General Hospital Research Institute, Toronto, ON, Canada
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Torregiani C, Baratella E, Segalotti A, Ruaro B, Salton F, Confalonieri P, Tavano S, Lapadula G, Bozzi C, Confalonieri M, Dellaca’ RL, Veneroni C. Oscillometry Longitudinal Data on COVID-19 Acute Respiratory Syndrome Treated with Non-Invasive Respiratory Support. J Clin Med 2024; 13:1868. [PMID: 38610633 PMCID: PMC11012861 DOI: 10.3390/jcm13071868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/02/2024] [Accepted: 03/16/2024] [Indexed: 04/14/2024] Open
Abstract
Background: Oscillometry allows for the non-invasive measurements of lung mechanics. In COVID-19 ARDS patients treated with Non-Invasive Oxygen Support (NI-OS), we aimed to (1) observe lung mechanics at the patients' admission and their subsequent changes, (2) compare lung mechanics with clinical and imaging data, and (3) evaluate whether lung mechanics helps to predict clinical outcomes. Methods: We retrospectively analyzed the data from 37 consecutive patients with moderate-severe COVID-19 ARDS. Oscillometry was performed on their 1st, 4th, and 7th day of hospitalization. Resistance (R5), reactance (X5), within-breath reactance changes (ΔX5), and the frequency dependence of the resistance (R5-R19) were considered. Twenty-seven patients underwent computed tomographic pulmonary angiography (CTPA): collapsed, poorly aerated, and normally inflated areas were quantified. Adverse outcomes were defined as intubation or death. Results: Thirty-two patients were included in this study. At the first measurement, only 44% of them had an abnormal R5 or X5. In total, 23 patients had measurements performed on their 3rd day and 7 on their 7th day of hospitalization. In general, their R5, R5-R19, and ΔX decreased with time, while their X5 increased. Collapsed areas on the CTPA correlated with the X5 z-score (ρ = -0.38; p = 0.046), while poorly aerated areas did not. Seven patients had adverse outcomes but did not present different oscillometry parameters on their 1st day of hospitalization. Conclusions: Our study confirms the feasibility of oscillometry in critically ill patients with COVID-19 pneumonia undergoing NI-OS. The X5 z-scores indicates collapsed but not poorly aerated lung areas in COVID-19 pneumonia. Our data, which show a severe impairment of gas exchange despite normal reactance in most patients with COVID-19 ARDS, support the hypothesis of a composite COVID-19 ARDS physiopathology.
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Affiliation(s)
- Chiara Torregiani
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Elisa Baratella
- Radiology Unit, Department of Medical Surgical and Health Sciences, University Hospital of Cattinara, 34149 Trieste, Italy
| | - Antonio Segalotti
- Radiology Unit, Department of Medical Surgical and Health Sciences, University Hospital of Cattinara, 34149 Trieste, Italy
| | - Barbara Ruaro
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Francesco Salton
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Paola Confalonieri
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Stefano Tavano
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Giulia Lapadula
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Chiara Bozzi
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Marco Confalonieri
- Pulmonology Unit, Department of Medical Surgical and Health Sciences, University of Trieste, Hospital of Cattinara, 34149 Trieste, Italy
| | - Raffaele L. Dellaca’
- Department of Electronics, Information and Biomedical Engineering (DEIB), TechRes Lab, Politecnico di Milano University, 20122 Milano, Italy; (R.L.D.); (C.V.)
| | - Chiara Veneroni
- Department of Electronics, Information and Biomedical Engineering (DEIB), TechRes Lab, Politecnico di Milano University, 20122 Milano, Italy; (R.L.D.); (C.V.)
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Suppini N, Oancea C, Fira-Mladinescu O, Traila D, Pescaru C, Marc MS, Manolescu D, Vastag E, Ali A, Hogea E, Pilut CN. Post-Infection Oscillometry and Pulmonary Metrics in SARS-CoV-2 Patients: A 40-Day Follow-Up Study. Diseases 2023; 11:102. [PMID: 37606473 PMCID: PMC10443293 DOI: 10.3390/diseases11030102] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/23/2023] Open
Abstract
The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has had significant impacts on pulmonary function. This study aimed to comprehensively evaluate pulmonary function and structure in patients 40 days post-SARS-CoV-2 infection, employing an array of testing methodologies including spirometry, plethysmography, forced oscillometry, and CT scanning. It also sought to establish potential correlations between these metrics and evaluate if forced oscillometry could provide additional value in post-infective lung function assessment. A 40-day post-infection follow-up observational study was conducted involving 66 patients with confirmed SARS-CoV-2 infection. The results revealed decreases in FVC and FEF25-75 with the increasing severity of COVID-19. Specifically, patients with severe symptoms exhibited statistically significant decreases in FVC (mean = 86.8) compared with those with mild symptoms (mean = 106.0; p = 0.018). The FEF25-75 showed a similar trend, with severe patients exhibiting a mean of 77.7 compared with 82.9 in the mild group (p = 0.017). Furthermore, resonant frequency (RF) increased with disease severity, with the severe group exhibiting a statistically significant increase (mean = 17.4) compared with the mild group (mean = 14.3; p = 0.042). CT scans showed an increase in ground-glass opacities with disease severity, with 81.8% of severe patients demonstrating this finding (p = 0.037). Multiple regression analysis revealed that Reactance at 4 Hz (X4), Forced Expiratory Flow 25-75% (FEF25-75), and Resonant Frequency (RF) were significantly related to COVID-19 severity. Specifically, for each unit increase in these factors, the risk of the event was estimated to increase by a factor of 3.16, 2.09, and 1.90, respectively. Conversely, Resistance at 4 Hz (R4) and Airway Resistance (RAW) were found to significantly decrease the event hazard, highlighting their potential protective role. Spirometry, plethysmography, and forced oscillometry are effective in assessing these changes. Forced oscillometry may be particularly beneficial in identifying subtle changes in lung function post-COVID-19. Further studies are warranted to validate these findings and develop strategies to manage post-infective pulmonary changes in SARS-CoV-2 patients.
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Affiliation(s)
- Noemi Suppini
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Doctoral School, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Cristian Oancea
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Ovidiu Fira-Mladinescu
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Daniel Traila
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Camelia Pescaru
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Monica Steluta Marc
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Diana Manolescu
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Department of Radiology and Medical Imaging, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Emanuela Vastag
- Discipline of Pulmonology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
- Center for Research and Innovation in Precision Medicine of Respiratory Diseases (CRIPMRD), "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Ayesha Ali
- Bhaskar Medical College, Amdapur Road 156-162, Hyderabad 500075, Telangana State, India
| | - Elena Hogea
- Department of Microbiology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
| | - Ciprian Nicolae Pilut
- Department of Microbiology, "Victor Babes" University of Medicine and Pharmacy Timisoara, 300041 Timisoara, Romania
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