Respiratory Muscle

Assessment Of The Function Of The Active Chest Wall Campbell Diagram

Campbell Diagram

To evaluate respiratory muscle action, a Campbell diagram, in which lung volume on the ordinate is plotted against pleural pressure on the abscissa, can be constructed. In this diagram, pleural pressure has differing significance depending on the maneuver. Consider a subject who is slowly inflated and deflated passively by a syringe connected to the airway while the respiratory muscles are relaxed passive inflation Figure 2 . The pleural pressure, which is equal to transthoracic pressure, rises...