Short-term Exposure to High Altitude in Patients With Asymptomatic Aortic Stenosis

"Participants will be escorted to high altitude and undergo the following examination both at 540 and 3545m above sea level:~* 12-lead electrocardiogram~* Transthoracic echocardiography with measurement of left and right ventricular dimension and function, global longitudinal strain and transvalvular gradient~* Symptom-limited cardiopulmonary stress exercise test with a ramp protocol with a focused echocardiography for the assessment of cardiac output and transvalvular gradient and blood gas analysis~* 24 hours wearable rhythm monitoring~* Blood Work: cardiac biomarkers (Troponin T, CK, CK-MB, NT-pro-BNP), blood gas analysis, Hemoglobin, Hematocrit, Leucocytes, Thrombocytes, Creatinin, eGFR, Sodium, Potassium, ASAT, ALAT, Bilirubin)"