58% A chest trauma patient wearing a 40% $\text{FiO}_2$ oxygen mask has a $\text{PaO}_2$ of 138 mm Hg. This finding indicates a problem at what point on the tissue oxygenation cascade? Cardiac output Hemoglobin availability Diffusion Ventilation Pick your confidence level answering this question to continue High Medium Low
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Step 1: The question asks to identify the point of problem in the tissue oxygenation cascade for a patient with specific parameters. Show more…
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Patient W has experienced a sudden loss in endurance over the past several months. His cardiac output is strong, but his heart rate is much higher than normal. His alveolar PO2 is about 150 mmHg, higher than normal, and he is breathing hard all of the time. His alveolar PCO2 is 20 mm Hg, lower than normal. His arterial PO2 is lower than normal, as is his arterial percent hemoglobin saturation (which is below 70%). At what step in the transport of gases between atmosphere and tissues is a problem occurring? Explain your answer. 5 pts Explain a disease process that could cause this problem. 5 pts Patient G has also lost endurance. She has a high ventilation and high heart rate at rest. Her exhaled, alveolar PO2 and arterial PO2 and PCO2 values are all normal, as is her hemoglobin percent saturation. Venous PO2 is very low. At what step in the transport of gases between atmosphere and tissues is a problem occurring? Explain your answer. 5 pts Explain a disease process could cause this to occur. 5 pts
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A male patient has presented with the following results for spirometry and plasma PO2. What is your diagnosis? (Use your lecture notes to derive the normal range for these parameters. Also note that usually plasma O2 is determined by saturation percentage, not PO2, but humor me here). Parameter Value Vital Capacity 4340 mL FEV1 3310 mL FVC 4120 mL Arterial PO2 86 mmHg Venous PO2 34 mmHg Group of answer choices COPD Pulmonary fibrosis Pulmonary edema Methemoglobinemia (causes a leftward shift in the oxygen-hemoglobin dissociation curve)
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