What are some relative contraindications for cardiopulmonary exercise testing?
1) Severe pulmonary hypertension or cor pulmonale
2) Known electrolyte disturbances (e.g., hypokalemia)
3) SaO₂ or SpO₂ less than 85% breathing room air
4) Untreated or unstable asthma

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1, 2, 3, and 4 are all relative contraindications for cardiopulmonary exercise testing. Severe pulmonary hypertension or cor pulmonale can worsen with the stress of exercise. Known electrolyte disturbances, such as hypokalemia, can predispose to arrhythmias during exercise. An oxygen saturation (SaO2 or SpO2) less than 85% indicates significant respiratory or cardiac impairment, increasing the risk during exercise. Untreated or unstable asthma can lead to bronchospasm and respiratory distress during the test.

What Are Some Relative Contraindications for Cardiopulmonary Exercise Testing