Q: What are the few indicators that Pulmonary Artery Catheter (Swan-Ganz catheter) tip is in appropriate West Zone III of lung?

Answer:

• PAWP < PADP by 1-5 mmHg
• PAWP alters < than 50% of increase in PEEP
• PAWP increases by < 50% of changes in alveolar pressure (Pplat)
• O2 saturation in wedged position greater than unwedged position 
• CXR: below level of Left Atrium