What classification of pulmonary arterial hypertension (PAH) symptoms does a patient exhibiting shortness of breath with minimal activity typically fall under?

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In the context of pulmonary arterial hypertension (PAH), the World Health Organization (WHO) functional classification system categorizes patients based on the severity of their symptoms and the extent to which their condition limits their physical activity.

A patient who experiences shortness of breath with minimal activity typically falls into WHO Functional Class III. This classification is defined by patients who are comfortable at rest but experience marked limitations in physical activity. They may be able to engage in some activities of daily living but will encounter significant breathlessness during physical exertion, even with slight exertion such as walking or climbing a few stairs.

This classification highlights the importance of recognizing how PAH can impact a patient's daily life. Individuals in this class usually experience symptoms that impact their quality of life, making management and treatment essential for improving their capacity for daily activities.

In contrast, WHO FC I would indicate no symptoms and no limitation of physical activity, while WHO FC II describes slight limitation and symptoms only during vigorous activity. WHO FC IV represents severe symptoms that may be present even at rest, indicating a more advanced stage of the disease. Understanding these classifications helps healthcare professionals tailor treatment plans and manage patient expectations effectively.

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