Which of the following are contraindications for performing an exercise test? A) PaO₂ less than 40 mm Hg on room air B) FEV₁ less than 70% of predicted C) Sinus tachycardia D) Dyspnea when lying flat in bed

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A PaO2 less than 40 mm Hg on room air indicates severe hypoxemia, which is a contraindication for exercise testing due to the risk of exacerbating respiratory failure.

Which of the Following Are Contraindications for Performing an Exercise