الفهرس 
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Abstract
Ultrasound has long shown its utility for plain organs. Although the lung has traditionally been excluded from its repertoire, studies have proven that this belief was unfounded. Lung ultrasonography (LUS) is recently becoming a standard tool in the diagnosis of lung disorders. Bedside LUS can detect pulmonary congestion by detecting the appearance of B-lines. Pulmonary edema may occur even without cardiomyopathy or heart failure, especially after excessive fluid administration. B-lines have been acknowledged as sonographic sign of pulmonary interstitial and alveolar edema in critical and emergency care. ASA class I and II patients whom ages were between 18 and 65 years old and prepared for elective major abdominal surgery who accepted to provide informed consent were included in this study. Our results showed that B lines appeared by using lung ultrasound in 37.5 % of patients who received liberal fluid during abdominal surgeries. B lines didn’t appear in any patient in the restrictive group. However, A lines was present in all patients before start of surgery.