Differential Diagnosis of Exertional Dyspnea Following Radiofrequency Ablation for Venous Insufficiency

Immediate Life-Threatening Causes to Exclude

Pulmonary embolism must be the first consideration given the recent venous intervention and history of venous insufficiency, as these patients have documented risk for thromboembolic complications 2, 4
The classic presentation of pulmonary embolism includes dyspnea on exertion with reduced peak aerobic capacity, high ventilatory equivalent for CO2, increased dead space ventilation, and widened alveolar-arterial oxygen gradient 2, 3
Patients with pulmonary vascular disease demonstrate reduced peak VO2, low anaerobic threshold, and high V̇E/V̇CO2 ratio even during light physical activities 2, 3

Heart failure with preserved ejection fraction (HFpEF) is a critical mimic that presents with exertional dyspnea in otherwise active individuals and must be distinguished from noncardiac causes 1, 5
The American College of Cardiology emphasizes that chronic venous insufficiency itself is listed as a noncardiac mimic of HFpEF, making this differential particularly challenging 1
Cardiac dysfunction presents with reduced peak VO2, low O2 pulse, steeper heart rate-VO2 relationship, and early anaerobic threshold 2, 6

Exercise-induced bronchoconstriction should be considered in athletic individuals with exertional dyspnea, particularly when symptoms occur during vigorous exercise 8, 9
The diagnosis of exercise-induced bronchoconstriction requires spirometry and detailed pulmonary examination to exclude underlying conditions such as COPD or restrictive lung disease 8, 9
Pulmonary hypertension can masquerade as asthma with wheezing, chronic cough, and dyspnea on exertion 10

The American College of Cardiology recommends measuring vital signs including oxygen saturation, respiratory rate, pulse rate, blood pressure, and temperature immediately 7
Cardiopulmonary exercise testing (CPET) is the definitive test to distinguish between cardiac, pulmonary, vascular, and deconditioning causes of exertional dyspnea 2, 3, 6
Transthoracic echocardiography should be performed if cardiac cause is suspected, particularly to evaluate for HFpEF and pulmonary hypertension 1, 5, 7