Class II heart failure means the patient experiences cardiac symptoms with what level of activity?

Class II heart failure, as classified by the New York Heart Association (NYHA), refers to patients who experience cardiac symptoms like fatigue, palpitations, or shortness of breath with ordinary physical activity. This means that patients are comfortable at rest but become symptomatic when engaging in typical daily activities such as walking, climbing stairs, or performing light activity.

In this classification, marked activity would typically encompass activities beyond what is considered ordinary, and hence this option is not accurate for Class II heart failure. Rather, it is ordinary activity that triggers the symptoms. Severe activity, likewise, can lead to more pronounced symptoms, but the focus for Class II is on the threshold of common activities. Similarly, patients at rest do not experience cardiac symptoms, which aligns with the criteria set for Class II heart failure.

To summarize, Class II heart failure indicates that symptoms arise with activities that are generally considered ordinary, but not with more strenuous exertion or at rest.