In what classification of CHF do patients experience marked limitation in physical activity but are comfortable at rest?

Patients classified as having Class III congestive heart failure (CHF) experience marked limitation in physical activity, meaning that they feel significant discomfort during even mild exertion, while they are comfortable at rest. This classification highlights the severity of their condition, indicating that everyday activities can lead to pronounced symptoms, such as fatigue or shortness of breath, although when at rest, they typically do not experience these issues.

Class I indicates no limitations of physical activity and patients can perform physical activities without symptoms. Class II refers to slight limitations where patients are comfortable at rest but experience symptoms with ordinary activity. Class IV, on the other hand, describes a severe level of heart failure where patients are unable to carry out any physical activity without discomfort and may have symptoms even at rest. Thus, Class III represents the specific level of limitation in physical activity while still allowing comfort at rest, making it the correct classification for the question posed.