الفهرس 
P OST O PERATIVE L UNG A TELECTASISOnly 14 pages are availabe for public view
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Abstract
Atelectasis is a common side effect of general anesthesia. Prevention of lung atelectasis, carbon dioxide retention and chest infection would improve the quality of medical care, and decrease hospital stay and costs. Lung ultrasonography in the perioperative period is feasible, allows tracking of perioperative atelectasis, with Sensitivity and specificity to detect atelectasis is 93% and 100%, respectively. Recently, a specific ultra-sonographic detection of the cardiac impulse definition termed the lung pulse has been reported to be a highly sensitive early indicator of the presence of atelectasis. Volume-controlled ventilation mode (VCV) is commonly used during general anesthesia while pressure controlled ventilation with volume guaranteed mode (PCVG) has recently been introduced in the field of anesthesiology.
Our study aim is to compare the effects of VCV and PCV-VG on postoperative lung atelectasis using chest ultrasound following upper abdominal laparotomies lasting more than 3 hrs randomly allocated into two groups A & B. group A received VCV and group B received PCV VG. ABG to measure PaCO2, PaO2 and SaO2% immediate after extubation also at 30min, 2, and 6hrs post operatively. LUS was performed to asses presence of lung atelectasis or not.
There was no significant difference between two groups regarding oxygenation and post-operative lung atelectasis. PCV-VG offered no advantage over VCV regarding the occurrence of the postoperative atelectasis. Further studies are required to determine the effect of each mode of ventilation on respiratory mechanics in different types of patients like obese patients, elder patients and patients with respiratory diseases.