Imposed power of breathing associated with use of an impedance threshold device

Ahamed H. Idris, Victor A. Convertino, Duane A. Ratliff, Donald F. Doerr, Keith G. Lurie, Andrea Gabrielli, Michael J. Banner

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

OBJECTIVE: To measure the imposed power of breathing (imposed work of breathing per minute) associated with spontaneous breathing through an active impedance threshold device and a sham impedance threshold device. DESIGN: Prospective randomized blinded protocol. SETTING: University medical center. PATIENTS: Nineteen healthy, normotensive volunteers (10 males, 9 females, age range 20-56 y, mean ± SD weight 54.8 ± 7.7 kg for females, 84 ± 8 kg for males). METHODS: The volunteers completed 2 trials of breathing through a face mask fitted with an active impedance threshold device set to open at -7 cm H2O pressure, or with a sham impedance threshold device, which was identical to the active device except that it did not contain an inspiratory threshold pressure valve diaphragm. Spontaneous breathing frequency (f), tidal volume (VT), exhaled minute ventilation, inspiratory pressure, and inspiratory time were measured with a respiratory monitor, and the data were directed to a laptop computer for real-time calculation of the imposed power of breathing. RESULTS: There were no significant differences in heart rate, respiratory rate, tidal volume, and minute ventilation, with and without inspiratory impedance. For the sham and active impedance threshold device groups, respectively, the mean ± SD imposed power of breathing values were 0.92 ± 0.63 J/min and 8.18 ± 4.52 J/min (p < 0.001), the mean ± SD inspiratory times were 1.98 ± 0.86 s and 2.97 ± 1.1 s (p = 0.001), and the mean ± SD inspiratory airway/mouth pressures were -1.1 ± 0.6 cm H2O and -11.7 ± 2.4 cm H2O (p < 0.001). CONCLUSIONS: Breathing through an active impedance threshold device requires significantly more power than breathing through a sham device. All subjects tolerated the respiratory work load and were able to complete the study protocol.

Original languageEnglish (US)
Pages (from-to)177-183
Number of pages7
JournalRespiratory Care
Volume52
Issue number2
StatePublished - Feb 2007

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Electric Impedance
Respiration
Equipment and Supplies
Pressure
Tidal Volume
Ventilation
Work of Breathing
Respiratory Rate
Masks
Diaphragm
Workload
Mouth
Volunteers
Healthy Volunteers
Heart Rate
Weights and Measures

Keywords

  • Hypotension
  • Inspiratory pressure
  • Minute ventilation
  • Power of breathing
  • Respiration

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

Cite this

Idris, A. H., Convertino, V. A., Ratliff, D. A., Doerr, D. F., Lurie, K. G., Gabrielli, A., & Banner, M. J. (2007). Imposed power of breathing associated with use of an impedance threshold device. Respiratory Care, 52(2), 177-183.

Imposed power of breathing associated with use of an impedance threshold device. / Idris, Ahamed H.; Convertino, Victor A.; Ratliff, Duane A.; Doerr, Donald F.; Lurie, Keith G.; Gabrielli, Andrea; Banner, Michael J.

In: Respiratory Care, Vol. 52, No. 2, 02.2007, p. 177-183.

Research output: Contribution to journalArticle

Idris, AH, Convertino, VA, Ratliff, DA, Doerr, DF, Lurie, KG, Gabrielli, A & Banner, MJ 2007, 'Imposed power of breathing associated with use of an impedance threshold device', Respiratory Care, vol. 52, no. 2, pp. 177-183.
Idris AH, Convertino VA, Ratliff DA, Doerr DF, Lurie KG, Gabrielli A et al. Imposed power of breathing associated with use of an impedance threshold device. Respiratory Care. 2007 Feb;52(2):177-183.
Idris, Ahamed H. ; Convertino, Victor A. ; Ratliff, Duane A. ; Doerr, Donald F. ; Lurie, Keith G. ; Gabrielli, Andrea ; Banner, Michael J. / Imposed power of breathing associated with use of an impedance threshold device. In: Respiratory Care. 2007 ; Vol. 52, No. 2. pp. 177-183.
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AU - Idris, Ahamed H.

AU - Convertino, Victor A.

AU - Ratliff, Duane A.

AU - Doerr, Donald F.

AU - Lurie, Keith G.

AU - Gabrielli, Andrea

AU - Banner, Michael J.

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N2 - OBJECTIVE: To measure the imposed power of breathing (imposed work of breathing per minute) associated with spontaneous breathing through an active impedance threshold device and a sham impedance threshold device. DESIGN: Prospective randomized blinded protocol. SETTING: University medical center. PATIENTS: Nineteen healthy, normotensive volunteers (10 males, 9 females, age range 20-56 y, mean ± SD weight 54.8 ± 7.7 kg for females, 84 ± 8 kg for males). METHODS: The volunteers completed 2 trials of breathing through a face mask fitted with an active impedance threshold device set to open at -7 cm H2O pressure, or with a sham impedance threshold device, which was identical to the active device except that it did not contain an inspiratory threshold pressure valve diaphragm. Spontaneous breathing frequency (f), tidal volume (VT), exhaled minute ventilation, inspiratory pressure, and inspiratory time were measured with a respiratory monitor, and the data were directed to a laptop computer for real-time calculation of the imposed power of breathing. RESULTS: There were no significant differences in heart rate, respiratory rate, tidal volume, and minute ventilation, with and without inspiratory impedance. For the sham and active impedance threshold device groups, respectively, the mean ± SD imposed power of breathing values were 0.92 ± 0.63 J/min and 8.18 ± 4.52 J/min (p < 0.001), the mean ± SD inspiratory times were 1.98 ± 0.86 s and 2.97 ± 1.1 s (p = 0.001), and the mean ± SD inspiratory airway/mouth pressures were -1.1 ± 0.6 cm H2O and -11.7 ± 2.4 cm H2O (p < 0.001). CONCLUSIONS: Breathing through an active impedance threshold device requires significantly more power than breathing through a sham device. All subjects tolerated the respiratory work load and were able to complete the study protocol.

AB - OBJECTIVE: To measure the imposed power of breathing (imposed work of breathing per minute) associated with spontaneous breathing through an active impedance threshold device and a sham impedance threshold device. DESIGN: Prospective randomized blinded protocol. SETTING: University medical center. PATIENTS: Nineteen healthy, normotensive volunteers (10 males, 9 females, age range 20-56 y, mean ± SD weight 54.8 ± 7.7 kg for females, 84 ± 8 kg for males). METHODS: The volunteers completed 2 trials of breathing through a face mask fitted with an active impedance threshold device set to open at -7 cm H2O pressure, or with a sham impedance threshold device, which was identical to the active device except that it did not contain an inspiratory threshold pressure valve diaphragm. Spontaneous breathing frequency (f), tidal volume (VT), exhaled minute ventilation, inspiratory pressure, and inspiratory time were measured with a respiratory monitor, and the data were directed to a laptop computer for real-time calculation of the imposed power of breathing. RESULTS: There were no significant differences in heart rate, respiratory rate, tidal volume, and minute ventilation, with and without inspiratory impedance. For the sham and active impedance threshold device groups, respectively, the mean ± SD imposed power of breathing values were 0.92 ± 0.63 J/min and 8.18 ± 4.52 J/min (p < 0.001), the mean ± SD inspiratory times were 1.98 ± 0.86 s and 2.97 ± 1.1 s (p = 0.001), and the mean ± SD inspiratory airway/mouth pressures were -1.1 ± 0.6 cm H2O and -11.7 ± 2.4 cm H2O (p < 0.001). CONCLUSIONS: Breathing through an active impedance threshold device requires significantly more power than breathing through a sham device. All subjects tolerated the respiratory work load and were able to complete the study protocol.

KW - Hypotension

KW - Inspiratory pressure

KW - Minute ventilation

KW - Power of breathing

KW - Respiration

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