Non-invasive quantification of diaphragm kinetics using m-mode sonography

  • Jean Ayoub
  • Robert Cohendy
  • Michel Dauzat
  • Rémi Targhetta
  • Jean-Eminanuel De La Coussaye
  • Jean-Marie Bourgeois
  • Michèle Ramonatxo
  • Christian Prefaut
  • Léandre Pourcelot
Measurement Techniques

DOI: 10.1007/BF03013389

Cite this article as:
Ayoub, J., Cohendy, R., Dauzat, M. et al. Can J Anaesth (1997) 44: 739. doi:10.1007/BF03013389

Abstract

Purpose

The standard conditions of spirometry (i.e., wearing a noseclip and breathing through a mouthpiece and a pneumotachograph) are likely to alter the ventilatory pattern. We used “time-motion” mode (M-mode) sonography to assess the changes in diaphragm kinetics induced by spirometry dunng quiet breathing.

Methods

An M-mode sonographic study of the nght diaphragm was performed before and dunng standard spirometry in eight patients without respiratory disease (age 34 to 68 yr).

Results

During spirometry, the diaphragm inspiratory amplitude (DIA) increased from 1.34 ± 0.18 cm to 1.80 ± 0.18 cm (P = 0.007), whereas the diaphragmatic mspiratory time (T1 diaph) increased from 1.27 ± 0.15 to 1.53 ± 0.23 sec, (P = 0.015), without change in diaphragmatic total time interval (Ttot diaph). Therefore, the diaphragm duty cycle (T1 diaph /Ttot diaph) increased from 38% ± 1% to 44% ± 4% (P = 0.023). The diaphragm inspiratory (DIV) and expiratory (DEV) motion velocity increased (P = 0.007).

Conclusion

M-mode sonography enabled us to demonstrate that the weanng of a nose clip and breathing through a mouthpiece and a pneumotachograph induce measurable changes in diaphragm kinetics.

Abbreviations

M

mode sonography, time-motion mode sonography

DIA

diaphragm inspiratory amplitude

T1

diaph, diaphragm inspiratory time

TE

diaph, diaphragm expiratory time

DIV

diaphragm inspiratory motion mean velocity

DEV

diaphragm expiratory motion mean velocity

Ttot

diaph, total time of diaphragmatic cycle

T1/Ttot

diaph, the diaphragmatic inspiratory ratio

DMT

diaphragm motion time

DRT

diaphragm resting time

VT

tidal volume

T1

inspiratory time

TE

expiratory time

VT/TI

mean inspiratory flow

Ttot

total time

TI/Ttot

inspiratory duty cycle

Résumé

Objectif

Les conditions de la spirométne standard (c.-à-d. le port du pince-nez et la respiration à travers un embout buccal et un pneumotacographe) sont susceptibles d’altérer la morphologie de la ventilation. Nous avons utilisé le mode «temps-amplitude» (mode M) de la sonographie pour évaluer les changements de la cinétique diaphragmatique provoqués par la spirométne pendant la respiration de repos.

Résultats

Pendant la spirométne, l’amplitude mspiratoire diaphragmatique augmentait de 1, 34 ± 0, 18 à 1, 80 ± 0, 18 cm (P = 0, 007), alors que le temps diaphragmatique mspiratoire (T1 diaph) augmentait de 1, 27 ± 0, 15 à 1, 53 ± 0, 23 sec (P = 0, 015), sans changement du temps diaphragmatique total (Ttot diaph). Par conséquent, le temps de l’activité diaphragmatique (T1 diaph/Ttot diaph) augmentait de 38 ± 1 % à 44 ± 4% (P = 0, 023). La vélocité de l’amplitude mspiratoire et expiratoire augmentait (P = 0, 007).

Conclusion

La sonographie en mode M nous a permis de démontrer que le port du pince-nez et la respiration à travers un embout buccal et un pneumotacographe provoquent des changements tangibles de la cinétique diaphragmatique.

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Copyright information

© Canadian Anesthesiologists 1997

Authors and Affiliations

  • Jean Ayoub
    • 1
  • Robert Cohendy
    • 2
  • Michel Dauzat
    • 3
  • Rémi Targhetta
    • 4
  • Jean-Eminanuel De La Coussaye
    • 2
  • Jean-Marie Bourgeois
    • 1
  • Michèle Ramonatxo
    • 5
  • Christian Prefaut
    • 2
  • Léandre Pourcelot
    • 6
  1. 1.Department of UltrasoundNîmes University HospitalNîmesFrance
  2. 2.Departments of Anaesthesia and Intensive CareNîmes University HospitalNîmesFrance
  3. 3.Department of Medical ImagingNîmes University HospitalNîmesFrance
  4. 4.Departments of Pneumology Unit and internal medicine ANîmes University HospitalNîmesFrance
  5. 5.Laboratory of Physiological InteractionsMontpellier University HospitalMontpellierFrance
  6. 6.Nuclear Medicine and UltrasoundINSERM U316, Tours University HospitalToursFrance
  7. 7.Medical Imaging DepartmentCentre Hospitalier UniversitaireNîmesFrance