Postoperative Complications in Patients With Obesity Hypoventilation Syndrome
Postoperative Complications in Patients With Obesity Hypoventilation Syndrome
Obstructive sleep apnea (OSA) and Obesity-Hypoventilation Syndrome (OHS) are common
 conditions in obesity, which may influence the prognosis in patients undergoing surgery.
 There is a need for simple screening tools to identify such patients at high risk. The
 current multicenter observational study aims to investigate occurrence of OSA and OHS in
 obese individuals undergoing elective abdominal surgery and further address its impact on
 perioperative and postoperative complications.
Obstructive sleep apnea (OSA) and Obesity-Hypoventilation Syndrome (OHS) are common
 conditions in obesity, which may influence the prognosis in patients undergoing surgery.
 There is a need for simple screening tools to identify such patients at high risk. The
 current multicenter observational study aims to investigate occurrence of OSA and OHS in
 obese individuals undergoing elective abdominal surgery by using questionnaires (STOPBANG
 questionnaire, Berlin Questionnaire, and Epworth Sleepiness Scale) and arterial blood gases.
 Perioperative and 72-h postoperative complications will be documented.
Inclusion Criteria:

 -  Patients undergoing elective abdominal surgery

 -  Body-Mass-Index >=30 kg/m2

 -  Ability to read and speak

 -  Signed informed consent.

 Exclusion Criteria:

 -  Use of diuretics

 -  Use of theophylline

 -  Use of respiratory depressing drugs

 -  Severe lung disease (FEV1/FVC<%50)

 -  Severe hearth failure (EF<%35)

 -  Central nervous system or muscle disease

 -  Untreated hypothyroidism

 -  Renal failure (GFR<50)

 -  Total parenteral nutrition more than 72 hours

 -  Hypokalemia

 -  Hyponatremia

 -  Hypomagnesemia

 -  Hypoalbuminemia

 -  Known sleep apnea or obesity hypoventilation syndrome

 -  Blood transfusion from blood bank within 72 hours prior to surgery