1
|
Bhalla AK, Klein MJ, Hotz J, Kwok J, Bonilla-Cartagena JE, Baron DA, Kohler K, Bornstein D, Chang D, Vu K, Armenta-Quiroz A, Nelson LP, Newth CJL, Khemani RG. Noninvasive Surrogate for Physiologic Dead Space Using the Carbon Dioxide Ventilatory Equivalent: Testing in a Single-Center Cohort, 2017-2023. Pediatr Crit Care Med 2024; 25:784-794. [PMID: 38771137 PMCID: PMC11379541 DOI: 10.1097/pcc.0000000000003539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
OBJECTIVES We sought to evaluate the association between the carbon dioxide ( co2 ) ventilatory equivalent (VEq co2 = minute ventilation/volume of co2 produced per min), a marker of dead space that does not require a blood gas measurement, and mortality risk. We compared the strength of this association to that of physiologic dead space fraction (V D /V t = [Pa co2 -mixed-expired P co2 ]/Pa co2 ) as well as to other commonly used markers of dead space (i.e., the end-tidal alveolar dead space fraction [AVDSf = (Pa co2 -end-tidal P co2 )/Pa co2 ], and ventilatory ratio [VR = (minute ventilation × Pa co2 )/(age-adjusted predicted minute ventilation × 37.5)]). DESIGN Retrospective cohort data, 2017-2023. SETTING Quaternary PICU. PATIENTS One hundred thirty-one children with acute respiratory distress syndrome. INTERVENTIONS None. MEASUREMENTS AND MAIN RESULTS All dead space markers were calculated at the same 1-minute timepoint for each patient within the first 72 hours of using invasive mechanical ventilation. The 131 children had a median (interquartile range, IQR) age of 5.8 (IQR 1.4, 12.6) years, oxygenation index (OI) of 7.5 (IQR 4.6, 14.3), V D /V t of 0.47 (IQR 0.38, 0.61), and mortality was 17.6% (23/131). Higher VEq co2 ( p = 0.003), V D /V t ( p = 0.002), and VR ( p = 0.013) were all associated with greater odds of mortality in multivariable models adjusting for OI, immunosuppressive comorbidity, and overall severity of illness. We failed to identify an association between AVDSf and mortality in the multivariable modeling. Similarly, we also failed to identify an association between OI and mortality after controlling for any dead space marker in the modeling. For the 28-day ventilator-free days outcome, we failed to identify an association between V D /V t and the dead space markers in multivariable modeling, although OI was significant. CONCLUSIONS VEq co2 performs similarly to V D /V t and other surrogate dead space markers, is independently associated with mortality risk, and may be a reasonable noninvasive surrogate for V D /V t .
Collapse
Affiliation(s)
- Anoopindar K Bhalla
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Margaret J Klein
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Justin Hotz
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Jeni Kwok
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | | | - David A Baron
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Kristen Kohler
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Dinnel Bornstein
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Daniel Chang
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Kennedy Vu
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Anabel Armenta-Quiroz
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
| | - Lara P Nelson
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Christopher J L Newth
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Robinder G Khemani
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital Los Angeles, Los Angeles, CA
- Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, CA
| |
Collapse
|
2
|
Klein-Blommert R, Markhorst DG, Bem RA. Exhaled CO2: No Volume to Waste. Pediatr Crit Care Med 2024; 25:860-863. [PMID: 39240665 DOI: 10.1097/pcc.0000000000003570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/07/2024]
Affiliation(s)
- Rozalinde Klein-Blommert
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands
| | - Dick G Markhorst
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands
| | - Reinout A Bem
- Pediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Reproduction and Development Research Institute, Amsterdam, The Netherlands
| |
Collapse
|
3
|
Gómez-Ríos MÁ, Sastre JA, Onrubia-Fuertes X, López T, Abad-Gurumeta A, Casans-Frances R, Gómez-Ríos D, Garzón JC, Martínez-Pons V, Casalderrey-Rivas M, Fernández-Vaquero MÁ, Martínez-Hurtado E, Martín-Larrauri R, Reviriego-Agudo L, Gutierrez-Couto U, García-Fernández J, Serrano-Moraza A, Martín LJR, Leis CC, Ramírez SE, Orgeira JMF, Lima MJV, Mayo-Yáñez M, Parente-Arias P, Sistiaga-Suárez JA, Bernal-Sprekelsen M, Charco-Mora P. Executive Summary of the Spanish Society of Anesthesiology, Reanimation and Pain Therapy (SEDAR) Spanish Society of Emergency and Emergency Medicine (SEMES) and Spanish Society of Otolaryngology, Head and Neck Surgery (SEORL-CCC) Guideline for difficult airway management. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2024:S2173-5735(24)00061-9. [PMID: 38797374 DOI: 10.1016/j.otoeng.2024.05.001] [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: 09/06/2023] [Accepted: 03/08/2024] [Indexed: 05/29/2024]
Abstract
The Airway section of the Spanish Society of Anesthesiology, Reanimation and Pain Therapy (SEDAR), Spanish Society of Emergency and Emergency Medicine (SEMES) and Spanish Society of Otolaryngology, Head and Neck Surgery (SEORL-CCC) present the Guidelines for the integral management of difficult airway in adult patients. This document provides recommendations based on current scientific evidence, theoretical-educational tools and implementation tools, mainly cognitive aids, applicable to the treatment of the airway in the field of anesthesiology, critical care, emergencies and prehospital medicine. Its principles are focused on the human factors, cognitive processes for decision-making in critical situations and optimization in the progression of the application of strategies to preserve adequate alveolar oxygenation in order to improve safety and quality of care.
Collapse
Affiliation(s)
- Manuel Á Gómez-Ríos
- Anesthesiology and Perioperative Medicine, Complejo Hospitalario Universitario de A Coruña, Spain.
| | - José Alfonso Sastre
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | | | - Teresa López
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | | | - Rubén Casans-Frances
- Department of Anesthesiology, Hospital Universitario Infanta Elena, Valdemoro, Madrid, Spain
| | | | - José Carlos Garzón
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | - Vicente Martínez-Pons
- Department of Anesthesiology, Hospital Universitari i Politecnic La Fe, Valencia, Spain
| | | | | | | | | | | | | | - Javier García-Fernández
- Department of Anesthesiology, Hospital Universitario Puerta de Hierro-Majadahonda, Majadahonda, Spain; Presidente de la Sociedad Española De Anestesiología, Reanimación y Terapéutica del Dolor (SEDAR), Spain
| | | | | | | | | | | | | | - Miguel Mayo-Yáñez
- Department of Otorhinolaryngology - Head Neck Surgery, Complexo Hospitalario Universitario A Coruña, Galicia, Spain
| | - Pablo Parente-Arias
- Department of Otorhinolaryngology - Head Neck Surgery, Complexo Hospitalario Universitario A Coruña, Galicia, Spain; Department of Otorhinolaryngology, Universidade de Santiago de Compostela, Galicia, Spain
| | - Jon Alexander Sistiaga-Suárez
- Department of Otorhinolaryngology, Hospital Universitario Donostia, Donostia, Spain; Presidente de la Comisión de Tumores de la OSI Donostialdea, Spain
| | - Manuel Bernal-Sprekelsen
- Department of Otorhinolaryngology, University of Barcelona, Barcelona, Spain; Department of Otorhinolaryngology, Hospital Clinic Barcelona, Spain; Presidente de la Sociedad Española de Otorrinolaringología y Cirugía de Cabeza y Cuello (SEORL-CCC), Spain
| | - Pedro Charco-Mora
- Department of Anesthesiology, Hospital Universitari i Politecnic La Fe, Valencia, Spain
| |
Collapse
|
4
|
Gómez-Ríos MÁ, Sastre JA, Onrubia-Fuertes X, López T, Abad-Gurumeta A, Casans-Francés R, Gómez-Ríos D, Garzón JC, Martínez-Pons V, Casalderrey-Rivas M, Fernández-Vaquero MÁ, Martínez-Hurtado E, Martín-Larrauri R, Reviriego-Agudo L, Gutierrez-Couto U, García-Fernández J, Serrano-Moraza A, Rodríguez Martín LJ, Camacho Leis C, Espinosa Ramírez S, Fandiño Orgeira JM, Vázquez Lima MJ, Mayo-Yáñez M, Parente-Arias P, Sistiaga-Suárez JA, Bernal-Sprekelsen M, Charco-Mora P. Spanish Society of Anesthesiology, Reanimation and Pain Therapy (SEDAR), Spanish Society of Emergency and Emergency Medicine (SEMES) and Spanish Society of Otolaryngology, Head and Neck Surgery (SEORL-CCC) Guideline for difficult airway management. Part II. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2024; 71:207-247. [PMID: 38340790 DOI: 10.1016/j.redare.2024.02.002] [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: 07/28/2023] [Accepted: 08/28/2023] [Indexed: 02/12/2024]
Abstract
The Airway Management section of the Spanish Society of Anesthesiology, Resuscitation, and Pain Therapy (SEDAR), the Spanish Society of Emergency Medicine (SEMES), and the Spanish Society of Otorhinolaryngology and Head and Neck Surgery (SEORL-CCC) present the Guide for the comprehensive management of difficult airway in adult patients. Its principles are focused on the human factors, cognitive processes for decision-making in critical situations, and optimization in the progression of strategies application to preserve adequate alveolar oxygenation in order to enhance safety and the quality of care. The document provides evidence-based recommendations, theoretical-educational tools, and implementation tools, mainly cognitive aids, applicable to airway management in the fields of anesthesiology, critical care, emergencies, and prehospital medicine. For this purpose, an extensive literature search was conducted following PRISMA-R guidelines and was analyzed using the GRADE methodology. Recommendations were formulated according to the GRADE methodology. Recommendations for sections with low-quality evidence were based on expert opinion through consensus reached via a Delphi questionnaire.
Collapse
Affiliation(s)
- M Á Gómez-Ríos
- Anesthesiology and Perioperative Medicine, Complejo Hospitalario Universitario de A Coruña, A Coruña, Spain.
| | - J A Sastre
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | - X Onrubia-Fuertes
- Department of Anesthesiology, Hospital Universitary Dr Peset, Valencia, Spain
| | - T López
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | - A Abad-Gurumeta
- Department of Anesthesiology, Hospital Universitario Infanta Leonor, Madrid, Spain
| | - R Casans-Francés
- Department of Anesthesiology, Hospital Universitario Infanta Elena, Valdemoro, Madrid, Spain
| | | | - J C Garzón
- Anesthesiology and Perioperative Medicine, Complejo Asistencial Universitario de Salamanca, Salamanca, Spain
| | - V Martínez-Pons
- Department of Anesthesiology, Hospital Universitari i Politècnic La Fe, Valencia, Spain
| | - M Casalderrey-Rivas
- Department of Anesthesiology. Complejo Hospitalario Universitario de Ourense, Ourense, Spain
| | - M Á Fernández-Vaquero
- Department of Anesthesiology, Hospital Clínica Universitaria de Navarra, Madrid, Spain
| | - E Martínez-Hurtado
- Department of Anesthesiology, Hospital Universitario Infanta Leonor, Madrid, Spain
| | | | - L Reviriego-Agudo
- Department of Anesthesiology, Hospital Clínico Universitario, Valencia, Spain
| | - U Gutierrez-Couto
- Biblioteca, Complejo Hospitalario Universitario de Ferrol (CHUF), Ferrol, A Coruña, Spain
| | - J García-Fernández
- Department of Anesthesiology, Hospital Universitario Puerta de Hierro-Majadahonda, Majadahonda, Madrid, Spain; President of the Spanish Society of Anesthesiology, Resuscitation and Pain Therapy (SEDAR), Spain
| | | | | | | | | | - J M Fandiño Orgeira
- Emergency Department, Complejo Hospitalario Universitario de A Coruña, A Coruña, Spain
| | - M J Vázquez Lima
- Emergency Department, Hospital do Salnes, Vilagarcía de Arousa, Pontevedra, Spain; President of the Spanish Emergency Medicine Society (SEMES), Spain
| | - M Mayo-Yáñez
- Department of Otorhinolaryngology/Head Neck Surgery, Complexo Hospitalario Universitario A Coruña, A Coruña, Spain
| | - P Parente-Arias
- Department of Otorhinolaryngology/Head Neck Surgery, Complexo Hospitalario Universitario A Coruña, A Coruña, Spain
| | - J A Sistiaga-Suárez
- Department of Otorhinolaryngology, Hospital Universitario Donostia, Donostia, Gipuzkoa, Spain
| | - M Bernal-Sprekelsen
- Department of Otorhinolaryngology, Hospital Clínic Barcelona, University of Barcelona, Barcelona, Spain; President of the Spanish Society for Otorhinolaryngology Head & Neck Surgery (SEORL-CCC), Spain
| | - P Charco-Mora
- Department of Anesthesiology, Hospital Universitari i Politècnic La Fe, Valencia, Spain
| |
Collapse
|
5
|
Miller LA, Braun RK, Golding RJ, Lasarev M, Rodgers AC, El-Meanawy S, Hacker TA, Eldridge MW, Al-Subu AM. Indirect cardiac output assessment in a swine pediatric acute respiratory distress syndrome model. Respir Physiol Neurobiol 2024; 320:104199. [PMID: 38000708 DOI: 10.1016/j.resp.2023.104199] [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] [Received: 08/07/2023] [Revised: 11/17/2023] [Accepted: 11/19/2023] [Indexed: 11/26/2023]
Abstract
PURPOSE To investigate the correlation between volume of carbon dioxide elimination (V̇CO2) and end-tidal carbon dioxide (PETCO2) with cardiac output (CO) in a swine pediatric acute respiratory distress syndrome (ARDS) model. METHODS Respiratory and hemodynamic variables were collected from twenty-six mechanically ventilated juvenile pigs under general anesthesia before and after inducing ARDS, using oleic acid infusion. RESULTS Prior to ARDS induction, mean (SD) CO, V̇CO2, PETCO2, and dead space to tidal volume ratio (Vd/Vt) were 4.16 (1.10) L/min, 103.69 (18.06) ml/min, 40.72 (3.88) mmHg and 0.25 (0.09) respectively. Partial correlation coefficients between average CO, V̇CO2, and PETCO2 were 0.44 (95% confidence interval: 0.18-0.69) and 0.50 (0.18-0.74), respectively. After ARDS induction, mean CO, V̇CO2, PETCO2, and Vd/Vt were 3.33 (0.97) L/min, 113.71 (22.97) ml/min, 50.17 (9.73) mmHg and 0.40 (0.08). Partial correlations between CO and V̇CO2 was 0.01 (-0.31 to 0.37) and between CO and PETCO2 was 0.35 (-0.002 to 0.65). CONCLUSION ARDS may limit the utility of volumetric capnography to monitor CO.
Collapse
Affiliation(s)
- Lorenzo A Miller
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, USA
| | - Rudolf K Braun
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, USA
| | | | - Michael Lasarev
- Department of Biostatistics & Medical Informatics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, USA
| | - Allison C Rodgers
- Cardiovascular Physiology Core Facility, Department of Medicine, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Sarah El-Meanawy
- Cardiovascular Physiology Core Facility, Department of Medicine, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Timothy A Hacker
- Cardiovascular Physiology Core Facility, Department of Medicine, University of Wisconsin-Madison, Madison, WI 53792, USA
| | - Marlowe W Eldridge
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, USA
| | - Awni M Al-Subu
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, WI 53792, USA; UWHealth Kids American Family Children's Hospital, Madison, WI 53792, USA.
| |
Collapse
|
6
|
Schulz E, Woollam M, Grocki P, Davis MD, Agarwal M. Methods to Detect Volatile Organic Compounds for Breath Biopsy Using Solid-Phase Microextraction and Gas Chromatography-Mass Spectrometry. Molecules 2023; 28:molecules28114533. [PMID: 37299010 DOI: 10.3390/molecules28114533] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Volatile organic compounds (VOCs) are byproducts from metabolic pathways that can be detected in exhaled breath and have been reported as biomarkers for different diseases. The gold standard for analysis is gas chromatography-mass spectrometry (GC-MS), which can be coupled with various sampling methods. The current study aims to develop and compare different methods for sampling and preconcentrating VOCs using solid-phase microextraction (SPME). An in-house sampling method, direct-breath SPME (DB-SPME), was developed to directly extract VOCs from breath using a SPME fiber. The method was optimized by exploring different SPME types, the overall exhalation volume, and breath fractionation. DB-SPME was quantitatively compared to two alternative methods involving the collection of breath in a Tedlar bag. In one method, VOCs were directly extracted from the Tedlar bag (Tedlar-SPME) and in the other, the VOCs were cryothermally transferred from the Tedlar bag to a headspace vial (cryotransfer). The methods were verified and quantitatively compared using breath samples (n = 15 for each method respectively) analyzed by GC-MS quadrupole time-of-flight (QTOF) for compounds including but not limited to acetone, isoprene, toluene, limonene, and pinene. The cryotransfer method was the most sensitive, demonstrating the strongest signal for the majority of the VOCs detected in the exhaled breath samples. However, VOCs with low molecular weights, including acetone and isoprene, were detected with the highest sensitivity using the Tedlar-SPME. On the other hand, the DB-SPME was less sensitive, although it was rapid and had the lowest background GC-MS signal. Overall, the three breath-sampling methods can detect a wide variety of VOCs in breath. The cryotransfer method may be optimal when collecting a large number of samples using Tedlar bags, as it allows the long-term storage of VOCs at low temperatures (-80 °C), while Tedlar-SPME may be more effective when targeting relatively small VOCs. The DB-SPME method may be the most efficient when more immediate analyses and results are required.
Collapse
Affiliation(s)
- Eray Schulz
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Mark Woollam
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Paul Grocki
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| | - Michael D Davis
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Mangilal Agarwal
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Integrated Nanosystems Development Institute, Indiana University-Purdue University, Indianapolis, IN 46202, USA
- Department of Mechanical & Energy Engineering, Indiana University-Purdue University, Indianapolis, IN 46202, USA
| |
Collapse
|
7
|
Mollura M, Baroncelli F, Mandelli G, Tricella G, Weissman GE, Poole D, Caironi P, Celi LA, Barbieri R, Finazzi S. Physiologic dead space is independently associated with mortality and discharge of mechanically ventilated patients with COVID-19 ARDS: a retrospective study. Sci Rep 2023; 13:5719. [PMID: 37029215 PMCID: PMC10081332 DOI: 10.1038/s41598-023-31999-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 03/21/2023] [Indexed: 04/09/2023] Open
Abstract
Physiologic dead space is a well-established independent predictor of death in patients with acute respiratory distress syndrome (ARDS). Here, we explore the association between a surrogate measure of dead space (DS) and early outcomes of mechanically ventilated patients admitted to Intensive Care Unit (ICU) because of COVID-19-associated ARDS. Retrospective cohort study on data derived from Italian ICUs during the first year of the COVID-19 epidemic. A competing risk Cox proportional hazard model was applied to test for the association of DS with two competing outcomes (death or discharge from the ICU) while adjusting for confounders. The final population consisted of 401 patients from seven ICUs. A significant association of DS with both death (HR 1.204; CI 1.019-1.423; p = 0.029) and discharge (HR 0.434; CI 0.414-0.456; p [Formula: see text]) was noticed even when correcting for confounding factors (age, sex, chronic obstructive pulmonary disease, diabetes, PaO[Formula: see text]/FiO[Formula: see text], tidal volume, positive end-expiratory pressure, and systolic blood pressure). These results confirm the important association between DS and death or ICU discharge in mechanically ventilated patients with COVID-19-associated ARDS. Further work is needed to identify the optimal role of DS monitoring in this setting and to understand the physiological mechanisms underlying these associations.
Collapse
Affiliation(s)
- Maximiliano Mollura
- Department of Electronic, Information and Bioengineering, Politecnico di Milano, Milan, Lombardia, Italy.
- Department of Medical Epidemiology, Mario Negri Institute for Pharmacological Research IRCCS, 24020, Ranica, Lombardia, Italy.
| | - Francesca Baroncelli
- Department of Anesthesia and Intensive Care, San Giovanni Bosco Hospital-ASL Città di Torino, Turin, Piemonte, Italy
| | - Giulia Mandelli
- Department of Medical Epidemiology, Mario Negri Institute for Pharmacological Research IRCCS, 24020, Ranica, Lombardia, Italy
| | - Giovanni Tricella
- Department of Medical Epidemiology, Mario Negri Institute for Pharmacological Research IRCCS, 24020, Ranica, Lombardia, Italy
| | - Gary E Weissman
- Palliative and Advanced Illness Research (PAIR) Center and Pulmonary, Allergy and Critical Care Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Daniele Poole
- Operative Unit ofAnesthesia and Intensive Care Unit, S. Martino Hospital, Belluno, Veneto, Italy
| | - Pietro Caironi
- Department of Anesthesia and Critical Care, Azienda Ospedaliero-Universitaria S. Luigi Gonzaga, Orbassano, Piemonte, Italy
- Department of Oncology, University of Turin, Turin, Piemonte, Italy
| | - Leo Anthony Celi
- Laboratory for Computational Physiology, Massachusetts Institute of Technology, Cambridge, MA, USA
- Division of Pulmonary, Critical Care and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Riccardo Barbieri
- Department of Electronic, Information and Bioengineering, Politecnico di Milano, Milan, Lombardia, Italy
| | - Stefano Finazzi
- Department of Medical Epidemiology, Mario Negri Institute for Pharmacological Research IRCCS, 24020, Ranica, Lombardia, Italy
| |
Collapse
|
8
|
Slobod D, Damia A, Leali M, Spinelli E, Mauri T. Pathophysiology and Clinical Meaning of Ventilation-Perfusion Mismatch in the Acute Respiratory Distress Syndrome. BIOLOGY 2022; 12:biology12010067. [PMID: 36671759 PMCID: PMC9855693 DOI: 10.3390/biology12010067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/20/2022] [Accepted: 12/27/2022] [Indexed: 01/03/2023]
Abstract
Acute respiratory distress syndrome (ARDS) remains an important clinical challenge with a mortality rate of 35-45%. It is being increasingly demonstrated that the improvement of outcomes requires a tailored, individualized approach to therapy, guided by a detailed understanding of each patient's pathophysiology. In patients with ARDS, disturbances in the physiological matching of alveolar ventilation (V) and pulmonary perfusion (Q) (V/Q mismatch) are a hallmark derangement. The perfusion of collapsed or consolidated lung units gives rise to intrapulmonary shunting and arterial hypoxemia, whereas the ventilation of non-perfused lung zones increases physiological dead-space, which potentially necessitates increased ventilation to avoid hypercapnia. Beyond its impact on gas exchange, V/Q mismatch is a predictor of adverse outcomes in patients with ARDS; more recently, its role in ventilation-induced lung injury and worsening lung edema has been described. Innovations in bedside imaging technologies such as electrical impedance tomography readily allow clinicians to determine the regional distributions of V and Q, as well as the adequacy of their matching, providing new insights into the phenotyping, prognostication, and clinical management of patients with ARDS. The purpose of this review is to discuss the pathophysiology, identification, consequences, and treatment of V/Q mismatch in the setting of ARDS, employing experimental data from clinical and preclinical studies as support.
Collapse
Affiliation(s)
- Douglas Slobod
- Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Critical Care Medicine, McGill University, Montreal, QC H3A 3R1, Canada
| | - Anna Damia
- Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Marco Leali
- Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Elena Spinelli
- Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Tommaso Mauri
- Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Ca’ Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
- Correspondence:
| |
Collapse
|
9
|
Kwon J, Kwon O, Oh K, Kim J, Shin CS, Yoo SK. Thermodiluted relative tidal volume estimation using a thermal camera in operating room under spinal anesthesia. Biomed Eng Online 2022; 21:64. [PMID: 36071495 PMCID: PMC9450307 DOI: 10.1186/s12938-022-01028-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/24/2022] [Indexed: 11/23/2022] Open
Abstract
Background Estimating relative tidal volume is an important factor when monitoring breathing status. The relationship between temperature and respiration volume has rarely been studied. In this paper, a formula was derived for calculating thermodiluted respiration volume from temperature changes in the nasal cavity. To evaluate the proposed formula, the study compared the relative tidal volume estimated by the proposed formula with that recorded by a respiration volume monitor (Exspiron1Xi, RVM). Thermal data were obtained for 8 cases at a rate of 10 measurements per second. Simultaneous recordings by the RVM are regarded as the reference. Results The mean of ICC coefficient is 0.948 ± 0.030, RMSE is 0.1026 ± 0.0284, R-squared value is 0.8962 ± 0.065 and linear regression coefficient \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\mathrm{\alpha }$$\end{document}α is 0.966 ± 0.104, \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\upbeta$$\end{document}β is 0.042 ± 0.057. Bland–Altman plot showed 96.01% of samples that the difference between the measured and estimated values exists within 2 standard deviations. Conclusions In this paper, a model that can thermodynamically calculate the relationship between thermal energy and respiration volume is proposed. The thermodiluted model is a feasible method for estimating relative respiration tidal volumes.
Collapse
Affiliation(s)
- JunHwan Kwon
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Oyun Kwon
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - KyeongTeak Oh
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jeongmin Kim
- Department of Anesthesiology and Pain Medicine, Severance Hospital, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Cheung Soo Shin
- Department of Anesthesiology and Pain Medicine, Severance Hospital, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.
| | - Sun K Yoo
- Department of Medical Engineering, Yonsei University College of Medicine, Seoul, Republic of Korea.
| |
Collapse
|
10
|
A "Bloody" Surprise: When Having Two Lungs Is Providential. Ann Am Thorac Soc 2022; 19:1419-1427. [PMID: 35913460 DOI: 10.1513/annalsats.202203-184cc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
11
|
Will the Real Bicarbonate Please Stand Up? Ann Am Thorac Soc 2022; 19:1226-1229. [PMID: 35772095 DOI: 10.1513/annalsats.202111-1286cc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
12
|
Montoya C, Steinhorn R, Berger J, Haroyan H, Said M, Perez GF. Authors' Response: CT Scan Using a Dynamic PEEP Protocol to Assess Optimal PEEP Level in Infants with Bronchopulmonary Dysplasia: A Few Unresolved Issues. Lung 2022; 200:279-281. [PMID: 35366080 DOI: 10.1007/s00408-022-00529-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 03/20/2022] [Indexed: 10/18/2022]
Affiliation(s)
- Cassie Montoya
- Division of Neonatology, Department of Pediatrics, Ann & Robert H. Lurie Children's Hospital of Chicago, Feinberg School of Medicine, Northwestern University Chicago, Chicago, IL, USA
| | - Robin Steinhorn
- Division of Neonatology, Children's National Medical Center, George Washington University, Washington, DC, USA
| | - John Berger
- Division of Cardiology, Children's National Medical Center, George Washington University, Washington, DC, USA
| | - Harutyun Haroyan
- Division of Radiology, Children's National Medical Center, George Washington University, Washington, DC, USA
| | - Mariam Said
- Division of Neonatology, Children's National Medical Center, George Washington University, Washington, DC, USA
| | - Geovanny F Perez
- Division of Pulmonary and Sleep Medicine, Oishei Children's Hospital, Jacobs School of Medicine and Biomedical Sciences, 1001 Main Street, Buffalo, NY, 14203, USA.
| |
Collapse
|
13
|
CT Scan Using a Dynamic PEEP Protocol to Assess Optimal PEEP Level in Infants with Bronchopulmonary Dysplasia: A Few Unresolved Issues. Lung 2022; 200:277-278. [PMID: 35274170 DOI: 10.1007/s00408-022-00526-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 03/06/2022] [Indexed: 10/18/2022]
|
14
|
Williams E, Dassios T, Dixon P, Greenough A. Physiological dead space and alveolar ventilation in ventilated infants. Pediatr Res 2022; 91:218-222. [PMID: 33603211 PMCID: PMC7891488 DOI: 10.1038/s41390-021-01388-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 01/18/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND Dead space is the volume not taking part in gas exchange and, if increased, could affect alveolar ventilation if there is too low a delivered volume. We determined if there were differences in dead space and alveolar ventilation in ventilated infants with pulmonary disease or no respiratory morbidity. METHODS A prospective study of mechanically ventilated infants was undertaken. Expiratory tidal volume and carbon dioxide levels were measured. Volumetric capnograms were constructed to calculate the dead space using the modified Bohr-Enghoff equation. Alveolar ventilation (VA) was also calculated. RESULTS Eighty-one infants with a median (range) gestational age of 28.7 (22.4-41.9) weeks were recruited. The dead space [median (IQR)] was higher in 35 infants with respiratory distress syndrome (RDS) [5.7 (5.1-7.0) ml/kg] and in 26 infants with bronchopulmonary dysplasia (BPD) [6.4 (5.1-7.5) ml/kg] than in 20 term controls with no respiratory disease [3.5 (2.8-4.2) ml/kg, p < 0.001]. Minute ventilation was higher in both infants with RDS or BPD compared to the controls. VA in infants with RDS or BPD was similar to that of the controls [p = 0.54]. CONCLUSION Prematurely born infants with pulmonary disease have a higher dead space than term controls, which may influence the optimum level during volume-targeted ventilation. IMPACT Measurement of the dead space was feasible in ventilated newborn infants. The physiological dead space was a significant proportion of the delivered volume in ventilated infants. The dead space (per kilogram) was higher in ventilated infants with respiratory distress syndrome or evolving bronchopulmonary dysplasia compared to term controls without respiratory disease. The dead space volume should be considered when calculating the most appropriate volume during volume-targeted ventilation.
Collapse
Affiliation(s)
- Emma Williams
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
- Asthma UK Centre for Allergic Mechanisms in Asthma, King's College London, London, UK
| | - Theodore Dassios
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
- Neonatal Intensive Care Unit, King's College Hospital NHS Foundation Trust, London, UK
| | | | - Anne Greenough
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK.
- Asthma UK Centre for Allergic Mechanisms in Asthma, King's College London, London, UK.
- NIHR Biomedical Centre at Guy's and St Thomas NHS Foundation Trust, King's College London, London, UK.
| |
Collapse
|
15
|
Pertzov B, Ronen M, Rosengarten D, Shitenberg D, Heching M, Shostak Y, Kramer MR. Use of capnography for prediction of obstruction severity in non-intubated COPD and asthma patients. Respir Res 2021; 22:154. [PMID: 34020637 PMCID: PMC8138110 DOI: 10.1186/s12931-021-01747-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 05/13/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Capnography waveform contains essential information regarding physiological characteristics of the airway and thus indicative of the level of airway obstruction. Our aim was to develop a capnography-based, point-of-care tool that can estimate the level of obstruction in patients with asthma and COPD. METHODS Two prospective observational studies conducted between September 2016 and May 2018 at Rabin Medical Center, Israel, included healthy, asthma and COPD patient groups. Each patient underwent spirometry test and continuous capnography, as part of, either methacholine challenge test for asthma diagnosis or bronchodilator reversibility test for asthma and COPD routine evaluation. Continuous capnography signal, divided into single breaths waveforms, were analyzed to identify waveform features, to create a predictive model for FEV1 using an artificial neural network. The gold standard for comparison was FEV1 measured with spirometry. MEASUREMENTS AND MAIN RESULTS Overall 160 patients analyzed. Model prediction included 32/88 waveform features and three demographic features (age, gender and height). The model showed excellent correlation with FEV1 (R = 0.84), R2 achieved was 0.7 with mean square error of 0.13. CONCLUSION In this study we have developed a model to evaluate FEV1 in asthma and COPD patients. Using this model, as a point-of-care tool, we can evaluate the airway obstruction level without reliance on patient cooperation. Moreover, continuous FEV1 monitoring can identify disease fluctuations, response to treatment and guide therapy. TRIAL REGISTRATION clinical trials.gov, NCT02805114. Registered 17 June 2016, https://clinicaltrials.gov/ct2/show/NCT02805114.
Collapse
Affiliation(s)
- Barak Pertzov
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel.
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Michal Ronen
- Medtronic, Patient Monitoring, Jerusalem, Israel
| | - Dror Rosengarten
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Dorit Shitenberg
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Moshe Heching
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yael Shostak
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Mordechai R Kramer
- The Pulmonary Division, Pulmonary Institute, Rabin Medical Center, Beilinson Campus, 49100, Petach Tikva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| |
Collapse
|
16
|
Baloch K, Rehman Memon A, Ikhlaq U, Umair M, Ansari MI, Abubaker J, Salahuddin N. Assessing the Utility of End-Tidal Carbon Dioxide as a Marker for Fluid Responsiveness in Cardiogenic Shock. Cureus 2021; 13:e13164. [PMID: 33692926 PMCID: PMC7938016 DOI: 10.7759/cureus.13164] [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] [Indexed: 12/21/2022] Open
Abstract
Background Preventing end-organ failure in patients with shock requires rapid and easily accessible measurements of fluid responsiveness. Unlike septic shock, not all patients in cardiogenic shock are preload responsive. We conducted this study to determine the discriminant power of changes in end-tidal carbon dioxide (ETCO2), systolic blood pressure (SBP), inferior vena cava (IVC) collapsibility index (IVC-CI), and venous to arterial carbon dioxide (Pv-aCO2) gap after a fluid challenge and compared it to increases in cardiac output. Methodology In a prospective, quasi-experimental design, mechanically ventilated patients in cardiogenic shock were assessed for fluid responsiveness by comparing improvement in cardiac output (velocity time integral) with changes in ETCO2, heart rate, SBP, Pv-aCO2 gap, IVC-CI after a fluid challenge (a crystalloid bolus or passive leg raise). Results Out of 60 patients, with mean age 61.3 ± 14.8 years, mean acute physiology and chronic health evaluation (APACHE) score 14.82 ± 7.49, and median ejection fraction (EF) 25% (25-35), 36.7% (22) had non ST-segment elevation myocardial infarction (NSTEMI) and 60% (36) were ST-segment elevation myocardial infarction (STEMI). ETCO2 was the best predictor of fluid responsiveness; area under the curve (AUC) 0.705 (95% confidence interval (CI) 0.57-0.83), p=0.007, followed by reduction in Pv-aCO2 gap; AUC 0.598 (95% CI; 0.45-0.74), p= 0.202. Changes in SBP, mean arterial pressure (MAP), IVC-CI weren’t significant; 0.431 (p=0.367), 0.437 (p=0.410), 0.569 (p=0.367) respectively. The discriminant value identified for ETCO2 was more than equal to 2 mmHg, with sensitivity 58.6%, specificity 80.7%, positive predictive value 73.9% [95% CI; 56.5% to 86.1%], negative predictive value 69.7% [95% CI; 56.7% to 76.9%]. Conclusions Change in ETCO2 is a useful bedside test to predict fluid responsiveness in cardiogenic shock.
Collapse
Affiliation(s)
- Komal Baloch
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Aziz Rehman Memon
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Urwah Ikhlaq
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Madiha Umair
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Muhammad Imran Ansari
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Jawed Abubaker
- Internal Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| | - Nawal Salahuddin
- Critical Care Medicine, National Institute of Cardiovascular Diseases (NICVD), Karachi, PAK
| |
Collapse
|
17
|
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
|
18
|
Pitoni S, D'Arrigo S, Grieco DL, Idone FA, Santantonio MT, Di Giannatale P, Ferrieri A, Natalini D, Eleuteri D, Jonson B, Antonelli M, Maggiore SM. Tidal Volume Lowering by Instrumental Dead Space Reduction in Brain-Injured ARDS Patients: Effects on Respiratory Mechanics, Gas Exchange, and Cerebral Hemodynamics. Neurocrit Care 2020; 34:21-30. [PMID: 32323146 PMCID: PMC7224122 DOI: 10.1007/s12028-020-00969-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Background Limiting tidal volume (VT), plateau pressure, and driving pressure is essential during the acute respiratory distress syndrome (ARDS), but may be challenging when brain injury coexists due to the risk of hypercapnia. Because lowering dead space enhances CO2 clearance, we conducted a study to determine whether and to what extent replacing heat and moisture exchangers (HME) with heated humidifiers (HH) facilitate safe VT lowering in brain-injured patients with ARDS. Methods Brain-injured patients (head trauma or spontaneous cerebral hemorrhage with Glasgow Coma Scale at admission < 9) with mild and moderate ARDS received three ventilatory strategies in a sequential order during continuous paralysis: (1) HME with VT to obtain a PaCO2 within 30–35 mmHg (HME1); (2) HH with VT titrated to obtain the same PaCO2 (HH); and (3) HME1 settings resumed (HME2). Arterial blood gases, static and quasi-static respiratory mechanics, alveolar recruitment by multiple pressure–volume curves, intracranial pressure, cerebral perfusion pressure, mean arterial pressure, and mean flow velocity in the middle cerebral artery by transcranial Doppler were recorded. Dead space was measured and partitioned by volumetric capnography. Results Eighteen brain-injured patients were studied: 7 (39%) had mild and 11 (61%) had moderate ARDS. At inclusion, median [interquartile range] PaO2/FiO2 was 173 [146–213] and median PEEP was 8 cmH2O [5–9]. HH allowed to reduce VT by 120 ml [95% CI: 98–144], VT/kg predicted body weight by 1.8 ml/kg [95% CI: 1.5–2.1], plateau pressure and driving pressure by 3.7 cmH2O [2.9–4.3], without affecting PaCO2, alveolar recruitment, and oxygenation. This was permitted by lower airway (− 84 ml [95% CI: − 79 to − 89]) and total dead space (− 86 ml [95% CI: − 73 to − 98]). Sixteen patients (89%) showed driving pressure equal or lower than 14 cmH2O while on HH, as compared to 7 (39%) and 8 (44%) during HME1 and HME2 (p < 0.001). No changes in mean arterial pressure, cerebral perfusion pressure, intracranial pressure, and middle cerebral artery mean flow velocity were documented during HH. Conclusion The dead space reduction provided by HH allows to safely reduce VT without modifying PaCO2 nor cerebral perfusion. This permits to provide a wider proportion of brain-injured ARDS patients with less injurious ventilation.
Collapse
Affiliation(s)
- Sara Pitoni
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Sonia D'Arrigo
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Domenico Luca Grieco
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Francesco Antonio Idone
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Maria Teresa Santantonio
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Pierluigi Di Giannatale
- Department of Medical, Oral and Biotechnological Sciences, School of Medicine and Health Sciences, Section of Anesthesia, Analgesia, Perioperative and Intensive Care, SS. Annunziata Hospital, Gabriele d'Annunzio University of Chieti-Pescara, Via dei Vestini, 66100, Chieti, Italy
| | - Alessandro Ferrieri
- Department of Medical, Oral and Biotechnological Sciences, School of Medicine and Health Sciences, Section of Anesthesia, Analgesia, Perioperative and Intensive Care, SS. Annunziata Hospital, Gabriele d'Annunzio University of Chieti-Pescara, Via dei Vestini, 66100, Chieti, Italy
| | - Daniele Natalini
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Davide Eleuteri
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Bjorn Jonson
- Clinical Physiology, Skane University Hospital, 221 85, Lund, Sweden
| | - Massimo Antonelli
- Department of Anesthesiology and Intensive Care, Catholic University of the Sacred Heart, Fondazione Policlinico A. Gemelli IRCCS, Rome, Italy
| | - Salvatore Maurizio Maggiore
- Department of Medical, Oral and Biotechnological Sciences, School of Medicine and Health Sciences, Section of Anesthesia, Analgesia, Perioperative and Intensive Care, SS. Annunziata Hospital, Gabriele d'Annunzio University of Chieti-Pescara, Via dei Vestini, 66100, Chieti, Italy.
| |
Collapse
|
19
|
Xu J, Yu X, Zhang L, Fu Y, Jin K, Yin L, Yu S, Liu D. Modified volumetric capnography-derived parameter: A potentially stable indicator in monitoring cardiopulmonary resuscitation efficacy in a porcine model. Resuscitation 2020; 150:94-101. [PMID: 32220582 DOI: 10.1016/j.resuscitation.2020.02.039] [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] [Received: 11/16/2019] [Revised: 02/22/2020] [Accepted: 02/29/2020] [Indexed: 11/26/2022]
Abstract
AIM We aimed to investigate whether the ability of the volumetric capnography-derived parameter, the volume of CO2 eliminated per minute and per kg body weight (V'CO2 kg-1), in monitoring the quality of CPR and predicting the return of spontaneous circulation (ROSC) remains undisturbed by hyperventilation. METHODS This randomised crossover study included 12 male domestic pigs. After 4 min of untreated ventricular fibrillation, mechanical CPR was administered. Following 5-min washout periods, each animal underwent two sessions of experiments; four 5-min ventilation trials followed by advanced life support, consecutively in the two sessions. RESULTS Different ventilation types had no significant impact on V'CO2 kg-1 or haemodynamics. However, PETCO2 was significantly affected by the ventilation type and coronary perfusion pressure (P < 0.05). The means ± standard deviations of PETCO2 decreased linearly with an increase in the respiratory rate (RR) (P < 0.05). The PETCO2 decreased from 20.42 ± 9.51 to 16.16 ± 5.07 (P < 0.05) as the tidal volume increased from 10 to 20 mL min-1. No significant differences in V'CO2 kg-1 were observed between the three RR levels of ventilation types (P = 0.274). Post hoc analysis demonstrated a significant difference between the highest value of V'CO2 kg-1 in double tidal volume hyperventilation and normal ventilation and triple respiratory rate hyperventilation (P < 0.05). The AUC for V'CO2 kg-1 and PETCO2 in discriminating between survivors and non-survivors was 0.80 and 0.71, respectively. CONCLUSIONS V'CO2 kg-1 performs better than PETCO2 in monitoring the quality of CPR during hyperventilation. In predicting ROSC during variations in a ventilation state, V'CO2 kg-1 has good predictive ability.
Collapse
Affiliation(s)
- Jun Xu
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China.
| | - Xuezhong Yu
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China.
| | - Lili Zhang
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Yangyang Fu
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Kui Jin
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Lu Yin
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Shanshan Yu
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Danyu Liu
- Emergency Department, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| |
Collapse
|
20
|
Motta-Ribeiro GC, Vidal Melo MF, Jandre FC. A simplified 4-parameter model of volumetric capnograms improves calculations of airway dead space and slope of Phase III. J Clin Monit Comput 2019; 34:1265-1274. [PMID: 31872310 DOI: 10.1007/s10877-019-00451-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 12/15/2019] [Indexed: 11/24/2022]
Abstract
To evaluate a compact and easily interpretable 4-parameter model describing the shape of the volumetric capnogram, and the resulting estimates of anatomical dead space (VDAW) and Phase III (alveolar plateau) slope (SIII). Data from of 8 mildly-endotoxemic pre-acute respiratory distress syndrome sheep were fitted to the proposed 4-parameter model (4p) and a previously established 7-parameter model (7p). Root mean square error (RMSE) and Akaike information criterion (AIC), as well as VDAW and SIII derived from each model were compared. Confidence intervals for model's parameters, VDAW and SIII were estimated with a jackknife approach. RMSE values were similar (4p: 1.13 ± 0.01 mmHg vs 7p: 1.14 ± 0.01 mmHg) in the 791 breath cycles tested. However, the 7p overfitted the curve and had worse AIC in more than 50% of the cycles (p < 0.001). The large number of degrees of freedom also resulted in larger between-animal range of confidence intervals for 7p (VDAW: from 6.1 10-12 to 34 ml, SIII: from 9.53 10-7 to 1.80 mmHg/ml) as compared to 4p (VDAW: from 0.019 to 0.15 ml, SIII: from 3.9 10-4 to 0.011 mmHg/ml). Mean differences between VDAW (2.1 ± 0.04 ml) and SIII (0.047 ± 0.004 mmHg/ml) from 7 and 4p were significant (p < 0.001), but within the observed cycle-by-cycle variability. The proposed 4-parameter model of the volumetric capnogram improves data fitting and estimation of VDAW and SIII as compared to the 7-parameter model of reference. These advantages support the use of the 4-parameter model in future research and clinical applications.
Collapse
Affiliation(s)
- Gabriel C Motta-Ribeiro
- Biomedical Engineering Programme, COPPE, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcos F Vidal Melo
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, USA
| | - Frederico C Jandre
- Biomedical Engineering Programme, COPPE, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil.
| |
Collapse
|