Supplementary Material for: Cardiopulmonary Exercise Testing to Detect Chronic Thromboembolic Pulmonary Hypertension in Patients with Normal Echocardiography Held M. Grün M. Holl R. Hübner G. Kaiser R. Karl S. Kolb M. Schäfers H.J. Wilkens H. Jany B. 10.6084/m9.figshare.5126221.v1 https://karger.figshare.com/articles/dataset/Supplementary_Material_for_Cardiopulmonary_Exercise_Testing_to_Detect_Chronic_Thromboembolic_Pulmonary_Hypertension_in_Patients_with_Normal_Echocardiography/5126221 <b><i>Background:</i></b> Chronic thromboembolic pulmonary hypertension (CTEPH) is a serious complication of pulmonary embolism (PE). Taking into account the reported incidence of CTEPH after acute PE, the number of patients with undiagnosed CTEPH may be high. <b><i>Objectives:</i></b> We aimed to determine if cardiopulmonary exercise testing (CPET) could serve as complementary tool in the diagnosis of CTEPH and can detect CTEPH in patients with normal echocardiography. <b><i>Methods:</i></b> At diagnosis, we analyzed the data of CPET parameters in 42 patients with proven CTEPH and 51 controls, and evaluated the performance of two scores. <b><i>Results:</i></b> VE/VCO<sub>2</sub> slope, EQO<sub>2</sub>, EQCO<sub>2</sub>, P(A-a)O<sub>2</sub>, end-tidal partial pressure of CO<sub>2</sub> at anaerobic threshold (PETCO<sub>2</sub>) and capillary to end-tidal carbon dioxide gradient [P(c-ET)CO<sub>2</sub>] were significantly different between patients with CTEPH and controls (p < 0.001). P(c-ET)CO<sub>2</sub> was the single parameter with the highest sensitivity (85.7%) and specificity (88.2%). A score combining VE/VCO<sub>2</sub> slope, P(A-a)O<sub>2</sub>, P(c-ET)CO<sub>2</sub>, PETCO<sub>2</sub> [4-parameter-CPET (4-P-CPET) score] reached a sensitivity of 83.3% and a specificity of 92.2% after cross-validation. In 42 patients with CTEPH, echocardiography identified PH in 29 patients (69%), but it was normal in 13 patients (31%). All patients with normal or unmeasurable right ventricular systolic pressure had a pathological CPET. Twelve of the 13 patients (92%) were detected by both CPET scores. <b><i>Conclusion:</i></b> CPET is a useful noninvasive diagnostic tool for the detection of CTEPH in patients with suspected PH but normal echocardiography. The 4-P-CPET score provides a high sensitivity with the highest specificity. 2014-04-11 00:00:00 Cardiopulmonary exercise testing Chronic thromboembolic pulmonary hypertension Echocardiography Pulmonary artery pressure Pulmonary circulation Pulmonary embolism Pulmonary hypertension