Anaes Vivas · Applied cardiovascular & respiratory physiology
Data viva — the lung compliance curve
A Primary data viva — read compliance as the slope; explain hysteresis via surface tension and surfactant recruitment; predict how surfactant deficiency and PEEP shift the curve.
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ANZCAFRCAABAEDAIC
Prompt
A lung pressure-volume curve is shown with separate inspiratory and expiratory limbs (hysteresis). Define compliance from the curve, explain the cause of hysteresis, and state how surfactant and PEEP affect the curve.
Stimulus
A lung pressure-volume curve is shown with separate inspiratory and expiratory limbs (hysteresis). Define compliance from the curve, explain the cause of hysteresis, and state how surfactant and PEEP affect the curve.
References2ShowHide
- [1]Novaes-Silva MC, et al. How sighing regulates pulmonary surfactant structure and its role in breathing mechanics. Sci Adv, 2025.PMID 40991706
- [3]Hamasaka S, et al. Impact of Expiratory Port Structural Characteristics on Expiratory Pressure-Volume Area in Noninvasive Ventilation. Respir Care, 2026.PMID 42319047