For a valid expiratory hold measurement of auto-PEEP, which condition must be true?

For a valid expiratory hold measurement of auto-PEEP, which condition must be true?

• A. The patient must be spontaneously breathing
• B. The patient must be completely relaxed and not actively breathing
• C. The patient must be on high PEEP
• D. The patient must have a healthy baseline

Answer: (B)

Auto-PEEP is measured during a passive, end-expiratory hold, so you want the lungs to exhale without any active muscle effort. If the patient is spontaneously breathing or actively making inspiratory efforts during the hold, their respiratory muscles can alter airway pressure and flow, making the readout reflect patient effort rather than true passive exhalation. That’s why the measurement is valid only when the patient is completely relaxed and not actively breathing. The presence of high PEEP or a healthy baseline isn’t required for the hold to be valid; the crucial factor is the absence of patient effort during the expiratory pause. In practice, this often means the patient is sedated or neuromuscularly relaxed during the measurement.

Auto-PEEP is measured during a passive, end-expiratory hold, so you want the lungs to exhale without any active muscle effort. If the patient is spontaneously breathing or actively making inspiratory efforts during the hold, their respiratory muscles can alter airway pressure and flow, making the readout reflect patient effort rather than true passive exhalation. That’s why the measurement is valid only when the patient is completely relaxed and not actively breathing. The presence of high PEEP or a healthy baseline isn’t required for the hold to be valid; the crucial factor is the absence of patient effort during the expiratory pause. In practice, this often means the patient is sedated or neuromuscularly relaxed during the measurement.