Administrative reasons

To assess the incidence of Sleep Apnea-Hypopnea Syndrome (SAHS), both obstructive and central, in patients with: 1) pacemaker indication; 2) implantable cardioverter defibrillator (ICD) or cardiac resynchronization therapy (CRTD), 3) heart failure and preserved left ventricular ejection fraction (LVEF) and 4) heart failure and reduced LVEF.

Inclusion Criteria:

• Age 18 years or older

• No previous diagnosis of sleep apnea

• Fulfilling at least one of the following:

  1. Pacemaker indication
  2. ICD or CRTD therapy indication
  3. Heart failure and preserved LVEF (40-50%)
  4. Heart failure and reduced LVEF (<40%)

• Signed informed consent

Exclusion Criteria:

• Age younger than 18 years
• Renal hemodialysis
• Cardiac transplant indication
• Women who are pregnant
• Advanced cancer
• Enrollment in another investigational study
• Able and willing to comply with all testing and requirements
• Patient not suitable for inclusion due to psychiatric conditions or short life expectancy

Patients to be included in the registry:

• 200 patients with pacemaker indication in whom a pacemaker with sleep apnea monitoring system has been implanted.
• 100 patients with pacemaker indication in whom a pacemaker with no sleep apnea monitoring system has been implanted.
• 100 patients with ICD or CRDT therapy indication.
• 100 patients with heart failure and preserved LVEF (40-50%).
• 100 patients with heart failure and reduced LVEF (<40%).