Question 1

What tidal volume is used for ARDS?

Accepted Answer

Lung-protective ventilation commonly uses about 6 mL/kg predicted or ideal body weight with plateau pressure limitation below 30 cmH2O.

Question 2

What is RSBI?

Accepted Answer

RSBI is the rapid shallow breathing index. It equals respiratory rate divided by tidal volume in liters and is used as one measure of weaning readiness. A value below 105 suggests readiness for a spontaneous breathing trial.

Question 3

What causes auto-PEEP?

Accepted Answer

Auto-PEEP is caused by incomplete exhalation and air trapping, often from obstructive disease, high respiratory rate, high tidal volume, or short expiratory time.

Question 4

What is the difference between peak and plateau pressure?

Accepted Answer

Peak pressure reflects airway resistance plus alveolar pressure. Plateau pressure better reflects lung compliance when measured during an inspiratory pause with no flow.

Mechanical Ventilation TMC Questions