What is the ventilation perfusion matching required for good gas exchange?

A 70 year old female presents with dyspnea and cough. Medical history includes COPD, DM II, Hypertension and dyslipidemia. The labs are as follows:
T 102.3
HR 102
O2 84 room 90 nasal cannula
Bicarb 23
X -Ray: Focal consolidation Left Lower Lobe
1.Compare and contrast hospital vs. community acquired pneumonia

2.What is the ventilation perfusion matching required for good gas exchange?

3.Increasing FIO2 will improve hypoxia. Why?

4.How does Emphysema differ from Pneumonia?

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