Diaphragm ultrasonography to estimate the work of breathing during non-invasive ventilation

Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution t...

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Published in:Intensive care medicine Vol. 38; no. 5; pp. 796 - 803
Main Authors: Vivier, Emmanuel, Mekontso Dessap, Armand, Dimassi, Saoussen, Vargas, Frederic, Lyazidi, Aissam, Thille, Arnaud W., Brochard, Laurent
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer-Verlag 01.05.2012
Springer
Springer Nature B.V
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ISSN:0342-4642, 1432-1238, 1432-1238
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Abstract Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation. Methods This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH 2 O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration − thickness at expiration)/thickness at expiration. Diaphragmatic pressure–time product per breath (PTP di ) was measured from oesophageal and gastric pressure recordings. Results PTP di and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP di and TF (ρ = 0.74, p  < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18 % for inter-observer reproducibility. Conclusions Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
AbstractList Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation. Methods This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH 2 O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration − thickness at expiration)/thickness at expiration. Diaphragmatic pressure–time product per breath (PTP di ) was measured from oesophageal and gastric pressure recordings. Results PTP di and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP di and TF (ρ = 0.74, p  < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18 % for inter-observer reproducibility. Conclusions Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation. This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH.sub.2O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration - thickness at expiration)/thickness at expiration. Diaphragmatic pressure-time product per breath (PTP.sub.di) was measured from oesophageal and gastric pressure recordings. PTP.sub.di and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP.sub.di and TF ([rho] = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18 % for inter-observer reproducibility. Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation. This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH(2)O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration - thickness at expiration)/thickness at expiration. Diaphragmatic pressure-time product per breath (PTP(di)) was measured from oesophageal and gastric pressure recordings. PTP(di) and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP(di) and TF (ρ = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18% for inter-observer reproducibility. Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation.PURPOSEUltrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation.This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH(2)O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration - thickness at expiration)/thickness at expiration. Diaphragmatic pressure-time product per breath (PTP(di)) was measured from oesophageal and gastric pressure recordings.METHODSThis was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH(2)O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration - thickness at expiration)/thickness at expiration. Diaphragmatic pressure-time product per breath (PTP(di)) was measured from oesophageal and gastric pressure recordings.PTP(di) and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP(di) and TF (ρ = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18% for inter-observer reproducibility.RESULTSPTP(di) and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP(di) and TF (ρ = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18% for inter-observer reproducibility.Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.CONCLUSIONSUltrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation. Methods This was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH.sub.2O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration - thickness at expiration)/thickness at expiration. Diaphragmatic pressure-time product per breath (PTP.sub.di) was measured from oesophageal and gastric pressure recordings. Results PTP.sub.di and TF both decreased as the level of pressure support increased. A significant correlation was found between PTP.sub.di and TF ([rho] = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18 % for inter-observer reproducibility. Conclusions Ultrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
PurposeUltrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose diaphragm paralysis. We assessed the feasibility and accuracy of this method to assess diaphragmatic function and its contribution to respiratory workload in critically ill patients under non-invasive ventilation.MethodsThis was a preliminary physiological study in the intensive care unit of a university hospital. Twelve patients requiring planned non-invasive ventilation after extubation were studied while spontaneously breathing and during non-invasive ventilation at three levels of pressure support (5, 10 and 15 cmH2O). Diaphragm thickness was measured in the zone of apposition during tidal ventilation and the thickening fraction (TF) was calculated as (thickness at inspiration − thickness at expiration)/thickness at expiration. Diaphragmatic pressure–time product per breath (PTPdi) was measured from oesophageal and gastric pressure recordings.ResultsPTPdi and TF both decreased as the level of pressure support increased. A significant correlation was found between PTPdi and TF (ρ = 0.74, p < 0.001). The overall reproducibility of TF assessment was good but the coefficient of repeatability reached 18 % for inter-observer reproducibility.ConclusionsUltrasonographic assessment of the diaphragm TF is a non-invasive method that may prove useful in evaluating diaphragmatic function and its contribution to respiratory workload in intensive care unit patients.
Audience Academic
Author Thille, Arnaud W.
Vargas, Frederic
Vivier, Emmanuel
Lyazidi, Aissam
Dimassi, Saoussen
Mekontso Dessap, Armand
Brochard, Laurent
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  givenname: Emmanuel
  surname: Vivier
  fullname: Vivier, Emmanuel
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Faculté de Médecine, Université Paris Est Créteil, Réanimation Polyvalente, Centre Hospitalier Saint Joseph Saint
– sequence: 2
  givenname: Armand
  surname: Mekontso Dessap
  fullname: Mekontso Dessap, Armand
  email: armand.dessap@hmn.aphp.fr
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Faculté de Médecine, Université Paris Est Créteil, Unité U955 (IMRB), INSERM
– sequence: 3
  givenname: Saoussen
  surname: Dimassi
  fullname: Dimassi, Saoussen
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Unité U955 (IMRB), INSERM
– sequence: 4
  givenname: Frederic
  surname: Vargas
  fullname: Vargas, Frederic
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Unité U955 (IMRB), INSERM
– sequence: 5
  givenname: Aissam
  surname: Lyazidi
  fullname: Lyazidi, Aissam
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Unité U955 (IMRB), INSERM
– sequence: 6
  givenname: Arnaud W.
  surname: Thille
  fullname: Thille, Arnaud W.
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Unité U955 (IMRB), INSERM
– sequence: 7
  givenname: Laurent
  surname: Brochard
  fullname: Brochard, Laurent
  organization: AP-HP, Service de Réanimation Médicale, Centre Hospitalo-Universitaire Henri Mondor, Faculté de Médecine, Université Paris Est Créteil, Unité U955 (IMRB), INSERM, Soins Intensifs, Hôpitaux Universitaires de Genève et Université de Genève
BackLink http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25845297$$DView record in Pascal Francis
https://www.ncbi.nlm.nih.gov/pubmed/22476448$$D View this record in MEDLINE/PubMed
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Diaphragm
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Echography
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Snippet Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to...
Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to diagnose...
Purpose Ultrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to...
PurposeUltrasonography allows the direct observation of the diaphragm. Its thickness variation measured in the zone of apposition has been previously used to...
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SubjectTerms Aged
Aged, 80 and over
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Anesthesiology
Biological and medical sciences
Chronic obstructive pulmonary disease
Critical Care Medicine
Diaphragm - diagnostic imaging
Diaphragm - physiology
Emergency and intensive respiratory care
Emergency Medicine
Extubation
Feasibility Studies
Female
France
Hospital patients
Hospitals, University
Humans
Intensive
Intensive care
Intensive care medicine
Intensive Care Units
Male
Medical sciences
Medicine
Medicine & Public Health
Monitoring, Physiologic
Original
Ostomy
Pain Medicine
Pediatrics
Physiological aspects
Pneumology/Respiratory System
Positive-Pressure Respiration
Reproducibility
Respiratory failure
Ultrasonic imaging
Ultrasonography
Ultrasound imaging
Ventilators
Weaning
Work of Breathing - physiology
Workloads
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Title Diaphragm ultrasonography to estimate the work of breathing during non-invasive ventilation
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Volume 38
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