Copyright © 2008 Thomson Delmar Learning CHAPTER 8 Ventilation-Perfusion Relationships.

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Presentation transcript:

Copyright © 2008 Thomson Delmar Learning CHAPTER 8 Ventilation-Perfusion Relationships

Copyright © 2008 Thomson Delmar Learning Normal Ventilation-Perfusion Ratio (V/Q Ratio) Fig The normal ventilation-perfusion ratio (V/Q ratio) is about 0.8.

Copyright © 2008 Thomson Delmar Learning HOW THE VENTILATION- PERFUSION RATIO AFFECTS THE ALVEOLAR GASES

Copyright © 2008 Thomson Delmar Learning Upright Lung and V/Q Ratio Fig In the upright lung, the V/Q ratio progressively decreases from the apex to the base.

Copyright © 2008 Thomson Delmar Learning INCREASED V/Q RATIO

Copyright © 2008 Thomson Delmar Learning When the V/Q Ratio Is High Fig When the V/Q ratio is high, the alveolar oxygen pressure (PAO 2 ) increases and the alveolar carbon dioxide pressure (PACO 2 ) decreases.

Copyright © 2008 Thomson Delmar Learning DECREASED V/Q RATIO

Copyright © 2008 Thomson Delmar Learning When the V/Q Ratio Is Low Fig When the V/Q ratio is low, the alveolar oxygen pressure (PAO 2 ) decreases and the alveolar carbon dioxide pressure (PACO 2 ) increases.

Copyright © 2008 Thomson Delmar Learning The O 2 -CO 2 Diagram Fig The O 2 -CO 2 diagram.

Copyright © 2008 Thomson Delmar Learning HOW VENTILATION- PERFUSION RATIO AFFECTS END- CAPILLARY GASES

Copyright © 2008 Thomson Delmar Learning Pulmonary Capillary Blood Gases (PcO 2 and PcCO 2 ) Fig The mixing of pulmonary capillary blood gases (PcO 2 and PcCO 2 ) from the upper and lower lung regions.

Copyright © 2008 Thomson Delmar Learning V/Q Ratio and PAO 2 and the PcO 2, the PACO 2 Fig How changes in the V/Q ratio affect the PAO 2 and the PcO 2, the PACO 2, and the PcCO 2, and the pH of pulmonary blood.

Copyright © 2008 Thomson Delmar Learning Respiratory Quotient Internal respiration –Gas exchange between systemic capillaries and cells –Normally, 250 mL of O 2 consumed by tissue cells in one minute –In exchange, cells produce about 200 mL of CO 2

Copyright © 2008 Thomson Delmar Learning Respiratory Quotient (RQ) Clinically, it is the ratio between the volume of O 2 consumed (VO 2 ) and the volume of CO 2 produced (VCO 2 )

Copyright © 2008 Thomson Delmar Learning Respiratory Quotient

Copyright © 2008 Thomson Delmar Learning Respiratory Exchange Ratio External respiration –Gas exchange between the pulmonary capillaries and the alveoli Respiratory exchange ratio (RR) –Quantity of O 2 and CO 2 exchanged during a period of one minute Normally, the RR and RQ are equal

Copyright © 2008 Thomson Delmar Learning HOW RESPIRATORY DISORDERS AFFECT THE V/Q RATIO

Copyright © 2008 Thomson Delmar Learning Alveolar O 2 and CO 2 Pressure Changes Fig Alveolar O 2 and CO 2 pressure changes that occur as a result of V/Q ratio changes caused by respiratory disorder. (A) shunt unit; (B) normal unit; (C) dead space unit.

Copyright © 2008 Thomson Delmar Learning Clinical Application 1 Discussion How did this case illustrate … –An increased ventilation-perfusion ratio caused by an excessive amount of blood lost as a result of trauma?

Copyright © 2008 Thomson Delmar Learning Clinical Application 1 Clinical Application 1: A 34-year-old male impaled by a steel enforcement rod.

Copyright © 2008 Thomson Delmar Learning Clinical Application 2 Discussion How did this case illustrate … –A decreased V/Q ratio caused by an upper airway obstruction?

Copyright © 2008 Thomson Delmar Learning Clinical Application 2 Clinical Application 2: A 4-year-old boy who aspirated a quarter.

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