[Bariatric surgery. Patient selection and indication].

Successful reduction of body weight in patients with morbid obesity (BMI >40 kg/m(2)) is difficult and on a long-term basis nearly impossible with non-interventional treatment modalities. Surgical therapy is an efficient alternative for these patients. Potential surgical treatment should be carefully evaluated during a 6-month preoperative treatment phase during which indications and contraindications should be evaluated. Qualified postoperative care must be provided.