A patient with pulmonary hypotension who is able to tolerate ordinary physical activity without dyspnea or fatigue is said to have which level of severity of the disease?

Question

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A patient with pulmonary hypotension who is able to tolerate ordinary physical activity without dyspnea or fatigue is said to have Class I severity of the disease. Class II patients experience slight limitation of physical activity and may have dyspnea or fatigue with ordinary activities, while Class III patients have marked limitation of physical activity and may experience symptoms with less than ordinary activities. Class IV patients are unable to perform any physical activity without symptoms and may experience symptoms at rest.

A Patient with Pulmonary Hypotension Who Is Able to Tolerate