Identification of Heart Failure Patients by Seismocardiography

Inclusion Criteria: * Male or female, aged 18 years or older * Clinically suspected heart failure, and referred to an outpatient clinic * Be able and willing to comply with the clinical investigational plan * Have signed the informed consent form Exclusion Criteria: * Known HF * Known atrial fibrillation * Acute coronary syndrome * Implanted donor heart, mechanical heart, mechanical heart pump, pacemaker or Cardioverter Defibrillator (ICD) * Implanted electronic equipment in the area above and around the heart * Significant operation scars, abnormal body shape, fragile or compromised skin in the seismocardiographic recording area (fourth left Inter Costal space and xiphoid process) * Pregnancy Extension study: Inclusion criteria 1. Male or female, aged 18 years or older 2. Newly diagnosed HFREF 3. Be able and willing to comply with the clinical investigational plan 4. Have signed the informed consent form Exclusion criteria 1. Known atrial fibrillation 2. Acute coronary syndrome 3. Implanted donor heart, mechanical heart, mechanical heart pump, pacemaker or Cardioverter Defibrillator (ICD) 4. Implanted electronic equipment in the area above and around the heart 5. Significant operation scars, abnormal body shape, fragile or compromised skin in the seismocardiographic recording area (fourth left Inter Costal space and xiphoid process) 6. Pregnancy