The Science Journal of the American Association for Respiratory Care

2000 OPEN FORUM Abstracts

Monitoring Resistance and Compliance

Dean R. Hess, PhD, RRT, FAARC Massachusetts General Hospital, Boston, Massachusetts

Airways resistance and respiratory system compliance are important aspects of pulmonary mechanics. Both can be monitored in mechanically ventilated patients. This lecture will review methods for monitoring of resistance and compliance during mechanical ventilation.
Objectives
Describe the Equation of Motion as it related to respiratory mechanics
Describe the effects of respiratory mechanics on airway pressure during volume-controlled ventilation and the effects on flow during pressure-controlled ventilation
List factors that affect respiratory system compliance and airways resistance during mechanical ventilation
Compare inspiratory and expiratory airways resistance
Discuss the role of chest wall compliance during mechanical ventilation
Outline
A. Equation of Motion
B. Airway pressure during volume-controlled ventilation and flow during pressure-controlled ventilation
C. Respiratory system compliance
1 Lung versus chest wall compliance
2 Intra-abdominal pressure
D. Airways resistance
1 Inspiratory resistance
2 Expiratory resistance

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