| Patient Characteristics (%) | |
| Male | 81 |
| Age, average (SD) | 58 (14) |
| Body Mass Index, average (SD) | 27 (5) |
| Medical History | |
| Atrial fibrillation | 14 |
| Other cardiac aritmia | 1 |
| Chronic obstructive pulmonary disease | 8 |
| Obstructive sleep apneu syndrome | 3 |
| Other sleep disorders | 1 |
| Diabetes mellitus | 15 |
| Mycardial infarction | 13 |
| Alcohol abuse | 1 |
| Heart failure | 4 |
| Hypertension | 35 |
| Psychiatric history | 0 |
| Cerebro-vasculair incident or transcient ischemic accident | 10 |
| Renalin sufficiency | 7 |
| Previous cardiac surgery | 10 |
| Previous thoracic surgery | 1 |
| Perioperative Factors | |
| Endocarditis | 1 |
| Mediastinitis | 0 |
| Reason of Admittance | |
| Cardiac surgery | 82 |
| Lung surgery | 14 |
| Other cardio-thoracic surgery | 4 |
| Previous Used Sleep Medication, Antipsychotics or Anxiolytica | |
| Sleep medication | 1 |
| Antipsychotic medication | 3 |
| Anxiolytica | 6 |