Final answer:
Respiratory alkalosis is not an indication for mechanical ventilation in patients with asthma.
Step-by-step explanation:
The correct answer is A. Respiratory alkalosis. Mechanical ventilation is not indicated for patients with asthma who have respiratory alkalosis.
Respiratory alkalosis occurs when the blood is overly alkaline due to a deficiency in carbonic acid and CO2 levels in the blood. This condition usually occurs when too much CO2 is exhaled from the lungs, as occurs in hyperventilation. In patients with respiratory alkalosis, increasing mechanical ventilation would further decrease CO2 levels and exacerbate the alkalosis.