Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator

Michael G. Winter, James D. Pike, Thomas A Dillard

Research output: Contribution to journal › Article

Abstract

INTRODUCTION: Maximum inspiratory pressure (MIP) is a clinical measure of respiratory muscle strength and pressure in the occluded airway at 0.1 seconds of tidal inspiration (P0.1) and is a reflection of ventilatory drive. Contemporary microprocessor-controlled ventilators permit measurement of MIP and P0.1 in intubated patients without removing the patient from the ventilator and without need for additional equipment. METHODS and MATERIALS: In a bench study of equipment accuracy, we compared MIP values from 3 Adult Star ventilators (ASVs) with an aneroid gauge, a respiratory pressure monitor, and a negative pressure ventilator and made similar comparisons for P0.1. RESULTS: Input values ranged from -10 to -55 cm H2O for MIP and from -1 to -9 cm H2O for P0.1. MIP values correlated strongly among all devices (r2 > 0.989, n = 30, p < 0.001). The average deviation from the reference value expressed as mean (SD) for MIP was +0.79 (0.68) for the respiratory pressure monitor; -1.46 (0.59) for the negative pressure ventilator; +1.34 (1.17) for the aneroid gauge; and -0.67 (0.84) for the ASVs (p < 0.05). The deviation in MIP among the 3 ASVs was -0.19, +0.42, and - 0.23 cm H2O after adjusting for device deviation in 2-factor ANOVA with covariate (p < 0.05). P0.1 values correlated strongly among all instruments (r2 > 0.931, n = 27, p < 0.001). The average deviation from reference values for P0.1 was +0.22 (0.30) for the respiratory pressure monitor; +0.03 (0.36) for the negative pressure ventilator; and -0.25 (0.55) for the ASVs. The deviation in P0.1 between individual ASVs was +0.04, - 0.15 and +0.11 cm H2O, by 2-factor ANOVA with covariate (p > 0.05). CONCLUSIONS: We conclude that the differences between devices were small and not likely to be clinically important and that the microprocessor-controlled ventilators compared favorably to the other devices.

Original languageEnglish (US)
Pages (from-to)946-951
Number of pages6
JournalRespiratory Care
Volume42
Issue number10
StatePublished - Oct 1 1997
Externally publishedYes

Fingerprint

Mechanical Ventilators
Pressure
Equipment and Supplies
Microcomputers
Negative-Pressure Ventilators
Respiratory Muscles
Muscle Strength
Maximal Respiratory Pressures

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine

Cite this

Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator. / Winter, Michael G.; Pike, James D.; Dillard, Thomas A.

In: Respiratory Care, Vol. 42, No. 10, 01.10.1997, p. 946-951.

Research output: Contribution to journal › Article

Winter, MG, Pike, JD & Dillard, TA 1997, 'Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator', Respiratory Care, vol. 42, no. 10, pp. 946-951.
Winter MG, Pike JD, Dillard TA. Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator. Respiratory Care. 1997 Oct 1;42(10):946-951.
Winter, Michael G. ; Pike, James D. ; Dillard, Thomas A. / Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator. In: Respiratory Care. 1997 ; Vol. 42, No. 10. pp. 946-951.
@article{9daea43579fa45d6b44bcb67eaf8455e,
title = "Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator",
abstract = "INTRODUCTION: Maximum inspiratory pressure (MIP) is a clinical measure of respiratory muscle strength and pressure in the occluded airway at 0.1 seconds of tidal inspiration (P0.1) and is a reflection of ventilatory drive. Contemporary microprocessor-controlled ventilators permit measurement of MIP and P0.1 in intubated patients without removing the patient from the ventilator and without need for additional equipment. METHODS and MATERIALS: In a bench study of equipment accuracy, we compared MIP values from 3 Adult Star ventilators (ASVs) with an aneroid gauge, a respiratory pressure monitor, and a negative pressure ventilator and made similar comparisons for P0.1. RESULTS: Input values ranged from -10 to -55 cm H2O for MIP and from -1 to -9 cm H2O for P0.1. MIP values correlated strongly among all devices (r2 > 0.989, n = 30, p < 0.001). The average deviation from the reference value expressed as mean (SD) for MIP was +0.79 (0.68) for the respiratory pressure monitor; -1.46 (0.59) for the negative pressure ventilator; +1.34 (1.17) for the aneroid gauge; and -0.67 (0.84) for the ASVs (p < 0.05). The deviation in MIP among the 3 ASVs was -0.19, +0.42, and - 0.23 cm H2O after adjusting for device deviation in 2-factor ANOVA with covariate (p < 0.05). P0.1 values correlated strongly among all instruments (r2 > 0.931, n = 27, p < 0.001). The average deviation from reference values for P0.1 was +0.22 (0.30) for the respiratory pressure monitor; +0.03 (0.36) for the negative pressure ventilator; and -0.25 (0.55) for the ASVs. The deviation in P0.1 between individual ASVs was +0.04, - 0.15 and +0.11 cm H2O, by 2-factor ANOVA with covariate (p > 0.05). CONCLUSIONS: We conclude that the differences between devices were small and not likely to be clinically important and that the microprocessor-controlled ventilators compared favorably to the other devices.",
author = "Winter, {Michael G.} and Pike, {James D.} and Dillard, {Thomas A}",
year = "1997",
month = "10",
day = "1",
language = "English (US)",
volume = "42",
pages = "946--951",
journal = "Respiratory Care",
issn = "0020-1324",
publisher = "Daedalus Enterprises Inc.",
number = "10",

}

TY - JOUR

T1 - Measurement of maximum inspiratory pressure and airway occlusion pressure in a bench study of the adult star ventilator

AU - Winter, Michael G.

AU - Pike, James D.

AU - Dillard, Thomas A

PY - 1997/10/1

Y1 - 1997/10/1

N2 - INTRODUCTION: Maximum inspiratory pressure (MIP) is a clinical measure of respiratory muscle strength and pressure in the occluded airway at 0.1 seconds of tidal inspiration (P0.1) and is a reflection of ventilatory drive. Contemporary microprocessor-controlled ventilators permit measurement of MIP and P0.1 in intubated patients without removing the patient from the ventilator and without need for additional equipment. METHODS and MATERIALS: In a bench study of equipment accuracy, we compared MIP values from 3 Adult Star ventilators (ASVs) with an aneroid gauge, a respiratory pressure monitor, and a negative pressure ventilator and made similar comparisons for P0.1. RESULTS: Input values ranged from -10 to -55 cm H2O for MIP and from -1 to -9 cm H2O for P0.1. MIP values correlated strongly among all devices (r2 > 0.989, n = 30, p < 0.001). The average deviation from the reference value expressed as mean (SD) for MIP was +0.79 (0.68) for the respiratory pressure monitor; -1.46 (0.59) for the negative pressure ventilator; +1.34 (1.17) for the aneroid gauge; and -0.67 (0.84) for the ASVs (p < 0.05). The deviation in MIP among the 3 ASVs was -0.19, +0.42, and - 0.23 cm H2O after adjusting for device deviation in 2-factor ANOVA with covariate (p < 0.05). P0.1 values correlated strongly among all instruments (r2 > 0.931, n = 27, p < 0.001). The average deviation from reference values for P0.1 was +0.22 (0.30) for the respiratory pressure monitor; +0.03 (0.36) for the negative pressure ventilator; and -0.25 (0.55) for the ASVs. The deviation in P0.1 between individual ASVs was +0.04, - 0.15 and +0.11 cm H2O, by 2-factor ANOVA with covariate (p > 0.05). CONCLUSIONS: We conclude that the differences between devices were small and not likely to be clinically important and that the microprocessor-controlled ventilators compared favorably to the other devices.

AB - INTRODUCTION: Maximum inspiratory pressure (MIP) is a clinical measure of respiratory muscle strength and pressure in the occluded airway at 0.1 seconds of tidal inspiration (P0.1) and is a reflection of ventilatory drive. Contemporary microprocessor-controlled ventilators permit measurement of MIP and P0.1 in intubated patients without removing the patient from the ventilator and without need for additional equipment. METHODS and MATERIALS: In a bench study of equipment accuracy, we compared MIP values from 3 Adult Star ventilators (ASVs) with an aneroid gauge, a respiratory pressure monitor, and a negative pressure ventilator and made similar comparisons for P0.1. RESULTS: Input values ranged from -10 to -55 cm H2O for MIP and from -1 to -9 cm H2O for P0.1. MIP values correlated strongly among all devices (r2 > 0.989, n = 30, p < 0.001). The average deviation from the reference value expressed as mean (SD) for MIP was +0.79 (0.68) for the respiratory pressure monitor; -1.46 (0.59) for the negative pressure ventilator; +1.34 (1.17) for the aneroid gauge; and -0.67 (0.84) for the ASVs (p < 0.05). The deviation in MIP among the 3 ASVs was -0.19, +0.42, and - 0.23 cm H2O after adjusting for device deviation in 2-factor ANOVA with covariate (p < 0.05). P0.1 values correlated strongly among all instruments (r2 > 0.931, n = 27, p < 0.001). The average deviation from reference values for P0.1 was +0.22 (0.30) for the respiratory pressure monitor; +0.03 (0.36) for the negative pressure ventilator; and -0.25 (0.55) for the ASVs. The deviation in P0.1 between individual ASVs was +0.04, - 0.15 and +0.11 cm H2O, by 2-factor ANOVA with covariate (p > 0.05). CONCLUSIONS: We conclude that the differences between devices were small and not likely to be clinically important and that the microprocessor-controlled ventilators compared favorably to the other devices.

UR - http://www.scopus.com/inward/record.url?scp=0030678447&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030678447&partnerID=8YFLogxK

M3 - Article

VL - 42

SP - 946

EP - 951

JO - Respiratory Care

JF - Respiratory Care

SN - 0020-1324

IS - 10

ER -

Access to Document