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Receiver operating characteristic curves (ROC) for spiroergometric parameters in patients with long COVID symptoms. A—late diastolic filling velocity; E/A—ratio of early to late diastolic transmitral flow velocity; E/E’—ratio of peak velocity of early diastolic transmitral flow to peak velocity of early diastolic mitral annular motion as determined by pulsed wave Doppler; FEV1/FVC—ratio of forced expiratory volume in one second to forced vital capacity.
