Lung Compliance I

These flashcards cover key concepts related to lung compliance, trans-pulmonary pressure, pneumothorax, and relevant definitions for understanding respiratory physiology.

Trans-pulmonary pressure

The pressure difference between the alveoli and the pleural space, defined as PTP = PALV - PPL.

Normal compliance value

A typical lung compliance value is C = ΔV/ΔP = 0.5 liters / 2.5 cm H2O = 0.2 liters per cm H2O.

Pneumothorax

A condition characterized by a breach of the thoracic cavity, allowing air to enter the pleural space, which can lead to lung collapse.

Compliance

A measure of how easily the lung can be stretched, which is similar to distensibility.

Pleural pressure

The pressure within the pleural space, typically measured to be negative relative to atmospheric pressure.

Driving force

The negative pressure in the pleural space acts as a vacuum that pulls the lungs out.

Air pressure equilibrium in pneumothorax

Occurs when the pleural space pressure equilibrates to 0 cm H2O, causing the lung to collapse.

Distensibility

The ability to stretch or expand; lung compliance is often equated with distensibility.