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Risk factors in patients.
| Risk factors | Number of patients | Percentage (%) |
|---|---|---|
| Age over 70 | 17 | 68 |
| Severe cardiac impairment: cardiac valvulopathy, previous coronary bypass and/or MI | 12 | 48 |
| Chronic pulmonary disease: (FEV1 ≤ 1l) | 10 | 40 |
| Neurological dysfunction | 3 | 12 |
| Surgery on thoracic aorta | 7 | 28 |
