NUR 2206 Oxygenation

NUR 2206 Oxygenation

• Ventilation

Answer

• Inspiration and Expiration

DETERMINED BY

• Compliance
• Airway resistance
• Accessory muscles
• Force of exhalation
• Increased CO2 in arterial blood (PaCO2)
• Decreased PaCO2 also influences inspiration to a lesser degree

• Compliance

Answer Stretch ability of lungs and alveolar sacs

• Diffusion

Answer Movement of O2 an CO2 between alveoli and capillaries (from higher pressure to lower pressure)

• Perfusion

Answer Delivery of oxygenated blood to body tissues

NEED

• Adequate pulmonary circulation
• Adequate hemoglobin to carry O2
• Adequate cardiac output to transport blood to body tissues

• Atelectasis 1 / 2

Answer A complete or partial collapse of a lung or lobe of a lung

• Surfactant

Answer

• Mixture of lipids and proteins which is secreted into the alveolar space

• Main function of surfactant is to lower the surface tension at the air/liquid interface within the

alveoli of the lung

• Does not arrive until 34-36 weeks in infants

• Oxygen transport is affected by...

Answer

• Amount of O2 entering lungs (ventilation)

• Pulmonary circulation
• Adequacy of diffusion
• Amount of hemoglobin to carry O2
• Cardiac output to transport blood to body tissues
• Peripheral circulation

** Problems with ventilation, diffusion, or perfusion lead to hypoxia

• Hypoxia

Answer

• Inadequate amount of O2 available to cells

• Problems with ventilation, diffusion, or perfusion lead to hypoxia

ACUTE HYPOXIA

• Changes in skin color - ex

cyanosis (bluing of the skin)

• Cough
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