Suggested Level of Knowlege: Detailed

LOs

BT_PO 1.22 Describe the composition of ideal alveolar and mixed expired gases

BT_PO 1.26 Discuss normal ventilation-perfusion matching

BT_PO 1.28 Describe the shunt equation

BT_PO 1.29 Discuss regional ventilation-perfusion inequalities, venous admixture and the effect on oxygenation and carbon dioxide elimination.

Past SAQs

2007.1, 2002.1 Define “Venous Admixture”. Briefly explain how venous admixture influences arterial oxygen tension and how an increase in inspired oxygen concentration may effect this.

2005.2 Describe the gravity dependent processes which affect pulmonary blood flow. What changes take place when the pressure increases in the pulmonary vessels?

2000.1 What is a normal value for pulmonary vascular resistance? Outline physiological factors that influence pulmonary resistance.

References

West: Respiratory Physiology

Lumb: Nunn's Applied Respiratory Physiology

Ganong 24 Ed Cap 26.

Ventilation Perfusion Relationships