When is the NYHA functional classification first used?

The New York Heart Association (NYHA) functional classification system is primarily used to assess the degree of limitation in physical activity due to heart failure symptoms. It categorizes patients based on their ability to perform everyday activities and how those activities are affected by the presence of heart failure symptoms, such as dyspnea or fatigue.

The classification is first utilized after symptoms of heart failure have been established. This means that the healthcare provider has already diagnosed heart failure and is observing its effects on the patient’s functional capabilities. By assessing the impact of heart failure on the patient's daily activities, nurses and other healthcare providers can better understand the severity of the condition and tailor treatment plans accordingly. Thus, the correct application of the NYHA classification begins after the symptoms of heart failure have been identified, as it reflects the patient's functional status in relation to their diagnosed condition.