Zone 1blood flow is lowest

- Alveolar pressure > arterial pressure > venous pressure.

- The high alveolar pressure may compress the capillaries and reduce blood flow in zone 1. This situation can occur if arterial blood pressure is decreased as a result of hemorrhage or if alveolar pressure is increased because of positive pressure ventilation.

Figure 4-10. Variation of ventilation (V) and blood flow [perfusion (Q)] in different regions of the lung.

Figure 4-10. Variation of ventilation (V) and blood flow [perfusion (Q)] in different regions of the lung.

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