الفهرس 
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Abstract
Obesity is a major worldwide problem in public health. Bariatric surgery has been shown to be more effective in the management of morbid obesity, compared to medical treatments in terms of weight loss and enhancement of comorbidities. Bariatric surgery has been established as the most effective and durable treatment for morbid obesity. Anesthetizing morbid obese patients requires careful considerations due to physiological and anthropometric changes. Intraoperative ventilatory support in obese patients has various challenges. Beside the impaired oxygen reserve, obese patients usually have comorbidities leading to impairment of respiratory mechanics during ventilation and increasing the risk of postoperative pulmonary complications. Several ventilatory strategies have been proposed to enhance gas exchange and outcome in obese patient. RM is one of the most effective technique to reverse atelectasis. In morbid obese patients undergoing laparoscopic surgery, recruitment of lung volume during surgery is highly recommended to improve intraoperative respiratory mechanics and oxygenation. IRV was used to improve arterial oxygenation in patients with lung injury. IRV also was found to improve arterial oxygenation in morbidly obese patients undergoing bariatric surgery.