Of the 34 patients who finally underwent thoracic surgery, 12 were women and 22 were men; the average age was 60 years. A majority (25) were patients with cancer. Among the comorbidities, the most frequent was hypertension (11) followed by dyslipidaemia (10), chronic obstructive pulmonary disease (5), diabetes (5), kidney failure (2) and cardiovascular disease (2).