Diagnostics of Coronavirus Disease 2019 Cardiovascular Complications

"Record an electrocardiogram (ECG) in one lead with an assessment of the pulse wave using a portable cardiac monitor CardioQvark (Russia, LLC L Card , RU No. RZN 2019/8124 dated February 15, 2019) once. Devices automatically transfer data to the A\&D Connect app paired with it (link). When transferring data, they are completely protected. The data obtained using the application must be sent to the specialists of the research group in a depersonalized form."

Cardiorespiratory stress testing with gas analysis using the Quark CPET diagnostic system (COSMED, Italy). The study protocol will consist of 4 phases: rest, warm-up, exercise and recovery. During the load phase, a ramp protocol will be used with a stepped load from 10 to 25 W/min. The increase in power will be calculated individually before the start of the study so that the test lasts 8-12 minutes until complete muscle failure.

The analysis of exhaled air will be performed using the Compact PTR-MS proton mass spectrometer manufactured by Ionicon (Austria)