Table 1.

Cardiopulmonary Exercise Testing Patterns and Corresponding Potential Clinical Diagnosis

Pattern	Differential Diagnosis
O2 Delivery/utilization mismatch	Chronic (systolic or diastolic) heart failure Pulmonary vascular disease Ischemic coronary disease Valvular Heart disease
Mechanical Ventilatory Impairment	COPD Interstitial lung disease Other persistent airflow obstructive disorders: asthma with airway remodeling, cystic fibrosis, bronchiectasis Chest wall disease Respiratory muscle dysfunction
Impaired gas exchange/altered ventilatory control.	Chronic (systolic or diastolic) heart failure Pulmonary vascular disease Lung V/Q mismatch disorders: COPD, interstitial lung disease

^*Adopted from Cortozi Berton et al. (21)