Table 3 CPET variables in different causes of dyspnea
From: Cardiopulmonary exercise testing and echocardiographic exam: an useful interaction
Condition | Variables |
|---|---|
Cardiovascular | Peak VO2 < 80% of the predicted |
Low ventilatory threshold (VT) | |
Chronotropic incompetence | |
Heart rate recovery ≤12 BPM after the first minute | |
Pulmonary | Peak VO2 < 80% of the predicted |
Low ventilatory threshold (VT) | |
Peak respiratory rate > 50/min | |
Ventilatory reserve (peak VE/MVV) < 15% | |
Oxygen desaturation | |
Deconditioning | Low-normal peak VO2 |
Low ventilatory threshold (VT) | |
Absence of any other abnormal response | |
Obesity | Absolute VO2 greater than predicted |
Indexed peak VO2 lower than predicted | |
Increased VO2/work slope | |
Muscle disease | Submaximal cardiac and respiratory response |
Low ventilatory threshold (VT) | |
Elevate lactate at submaximal work |