A PATTERN RECOGNITION SYSTEM FOR CLASSIFYING THE FUNCTIONAL STATUS OF PATIENTS WITH CHRONIC HEART, LUNG, AND PULMONARY VASCULAR DISEASES

Systems and methods for evaluating patients are provided. An example includes receiving first cardiopulmonary exercise test data for the patient and plotting a first vector based on the first cardiopulmonary exercise test data, the first vector including a first point based on a rest value and a second point based on an exercise value. A first coordinate value of the first point and a first coordinate value of the second point may be based on mixed expired CO2 (PECO2) and a second coordinate value of the first point and a second coordinate value of the second point may be based on end tidal CO2 (PetCO2). The example may also include plotting a midpoint of the first vector and triggering display of the plotted vector and plotted midpoint. The plotted vector and plotted midpoint may be displayed over a coordinate grid having multiple physiological condition zones.