Regarding mechanical loads in the context of mechanical and spontaneous ventilation, how is the load expressed in terms of work?
A. Work expresses load as the integral of volume over pressure.
B. Work expresses load as the integral of flow over volume.
C. Work expresses load as the integral of pressure over volume.
D. Work expresses load as the integral of volume over flow.
Q. 2 When airway pressure is integrated over tidal volume during a mechanically controlled breath, work done by which of the following components is provided?
A. work done on the respiratory system by the ventilator
B. work done on the respiratory system by the inspiratory muscles
C. work done on the lungs by the inspiratory muscles
D. work done on the chest wall by the inspiratory muscles
Q. 3 Which of the following terms refers to the difference between the inspiratory compliance and expiratory compliance?
A. resistance
B. hysteresis
C. elastanceD. volume dependency
Q. 4 The therapist is preparing to calculate the expiratory airway resistance of a mechanically ventilated patient. Based on the pressure-time scalar displayed here, which pressure or pressure gradient does the therapist need to use in the calculation?
A. g minus h
B. f minus g
C. f
D. g
Q. 5 The therapist is about to determine the respiratory system compliance of a patient receiving mechanical ventilation. The patient's tidal volume is 700 ml. Based on the pressure-time scalar presented below, which of the following pressures or pressure gradients does the therapist need to use in this calculation?
A. The pressure reading at f needs to be used.
B. The pressure gradient from g to f must be selected.
C. The g-h pressure gradient must be chosen.
D. The pressure measured at point g needs to be taken.
Q. 6 While monitoring a mechanically ventilated patient, the therapist performs an expiratory hold maneuver to ascertain the presence of auto-PEEP. During that maneuver, the therapist notes that the pressure indicates 0 cm H2O. How should the therapist interpret this finding? I. The patient has no auto-PEEP. II. Airway pressure at this time equals alveolar pressure. III. The patient's static compliance has increased. IV. The patient's lungs have not completely emptied.
A. I only
B. IV only
C. I, II only
D. II, III only
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