80 year old man presented with shortness of breath. This patient had history of CHF and COPD. His venous blood gases showed the following:
PH = 7.409
pCO2 = 54 mmHg
80 year old man presented with shortness of breath. This patient had history of CHF and COPD. His venous blood gases showed the following:
PH = 7.409
pCO2 = 54 mmHg
Answers:
PH = 7.547 that is moderate alkalaemia.
pCO2 = 24 mmHg, so we have respiratory alkalosis.
84 year old man with history of asthma and COPD presented with acute shortness of breath. His venous blood gases showed the following:
PH = 7.547
pCO2 = 24 mmHg
Answers:
Question 1:
PH = 7.58, that is severe alkalaemia.
pCO2 = 20 mmHg, so we have respiratory alkalosis. Next we need to calculate the compensation. From the story, the condition is most likely acute.
50-year-old man with THC hyperemesis. His blood gases showed the following:
PH = 7.58
pCO2 = 20 mmHg
Question 1:
PH = 7.475, that is mild alkalaemia.
pCO2 = 24 mmHg. So, we have respiratory alkalosis.
14-year-old girl, COVID day 2, presented with delirium. Her venous blood gases showed the following:
Ph = 7.475
pCO2 = 24 mmHg
Question 1:
PH = 7.31, that is mild acidaemia
PCO2 is high (51 mmHg). So we have respiratory acidosis. We don’t have enough information to decide if it is acute or chronic
70 year old man presented with reduced level of consciousness.
His venous blood gas showed the following:
PH = 7.31
PO2 = 62 mmHg (on 6L O2)
Answers:
PH = 7.479, that is mild acidaemia.
HCO3 = 30 mmol/L (that is high). So, we have metabolic alkalosis.
Next we check the respiratory compensation for metabolic alkalosis. For That we use the following equation: Expected pCO2 = 0.7 x HCO3 + 20 (+/- 5).