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Cardiopulmonary exercise testing of a patient with chronic thromboembolic pulmonary hypertension showing fields 4, 6 and 9 of the Wasserman panel. a) Elevated slope of minute ventilation (V′E)/carbon dioxide output (V′CO2) ratio showing hyperventilation (fi... Deepa Gopalan et al. Eur Respir Rev 2017;26:160108 ©2017 by European Respiratory Society