Smartphone Blood Pressure Measurement to Screen for Hypertension

Inclusion Criteria: * Informed consent as documented by signature * Men or women older than 18 years old * Good understanding of written and oral speaking used at the center where the study will be carried out Exclusion Criteria: * Patients that cannot sign informed consent * Patients in emergency situation, are not legally competent, cannot understand the situation or are vulnerable * Unable to participate due to pain or stress \[12\] * Known or suspected non-compliance (e.g. drug or alcohol abuse, language problems, psychological disorders, dementia) * Patients older than 80 years old \[4\] \[13\] * Known pregnancy * Known unstable cardiac condition (myocardial infarction \< 1 week, decompensated heart failure, pulmonary embolism) * End-stage renal disease (GFR \< 15/min/1.73m2 and/or dialysis) \[4\] \[14\] \[15\] \[16\] * Diabetes mellitus \[15\] \[8\] * Known (or assessed by recording heart rate and using pulse palpation, as recommended in ESC/ESH guidelines \[1\]) cardiac arrhythmia (atrial fibrillation, numerous extrasystoles and important bradycardia/bradyarrhythmia, bigeminy, trigeminy, isolated VPB) \[4\] \[1\] \[7\] \[15\] \[17\] * SBP or DBP difference between two arms \>10 mmHg \[8\] \[18\] * Patient with finger lesions that would alter the correct capture of signals by the mobile phone. * Known mobile phone contact dermatitis (caused by metal allergens, notably nickel and chromium * Incapacity of properly using the smartphone (i.e. incapacity of obtaining a recording with sufficient signal quality after the dedicated training)