This study will evaluate what is the impact of laparoscopy and Trendelenburg position on lung regional ventilation distribution in obese patients, focusing on the differences between the different phases of surgery.
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Inclusion Criteria: * age 18-90 years * Body mass index \> 30 kg/m2 * Major surgery * Predicted duration of surgery \> 2 hours * Predicted presence of invasive arterial pressure monitoring Exclusion Criteria: * emergency surgery * Refuse to participate from patient * presence of Implantable cardiac device or pacemaker * thoracic wounds * thoracic surgery