Pulmonary hypertension can result in impairment which can be quantified based on criteria developed by the AMA.
Parameters:
(1) functional class for congestive heart failure
(2) symptoms and response to therapy
NYHA Functional Class (1964)
Symptoms
Impairment of the Whole Person
Class 1
asymptomatic
0 - 9%
Class 1
asymptomatic with moderate dietary adjustment and drug therapy
10 – 29%
Class 2
symptoms partially responsive to moderate dietary adjustment and drug therapy
30 – 49%
Class 3 or 4
symptoms unresponsive to maximal dietary and medical therapy
50 – 100%
where:
• According to the AMA table, functional Class 2 indicates symptomatic when activity is greater than normal. In the current NYHA classification, a patient with Class 2 heart failure has symptoms with ordinary activities. The 1964 Class 2 corresponds to the current Class 1. This reflects the difference between the earlier classification and the revised classification introduced in later editions.
• Patients who have recovered from surgery for hypertrophic cardiomyopathy or who have had a heart transplantation are classified based
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