A 60-year-old woman is in the intensive care unit for treatment
of respiratory failure. Her underlying
disease is emphysema, caused by years of smoking. Her trachea
is intubated and she is on a mechanical ventilator to assist breathing.
The following lab results are obtained:
From arterial blood:
pH = 7.5
PCO2 = 35mm Hg
PO2 = 63mm Hg
Hemoglobin = 9g/dl
oxygen saturation = 73%
From Cardiac catheter in pulomonary artery:
Cardiac output = 5 L/min
PCO2 = 45mmHg
PO2 = 38mm Hg
In order to thoroughly respond to these questions be sure to review external and internal gas exchange.
1.) Describe pulmonary and systemic circulation with specific reference made to both external and internal respiratory exchange.
2.) How are oxygen and carbon dioxide transported in the blood? Elaborate on the role of hemoglobin in oxygen transport.
is normal arterial P02 and why is the patient's different? Explain.
4.) Describe the gross effects of emphysema on lung tissues.
How did smoking contribute to this problem?
5.) What is meant by oxygen saturation? How much oxygen is
delivered to the systemic tissues returns to the right atrium of the heart
in a healthy individual? this patient?
6.) The patient is currently on a mechanical ventilator,
what further treatments may be necessary for this patient?