One big problem in mechanically ventilated ICU patients is delayed gastric emptying. Delayed gastric emptying in these patients, causes intolerance and high gastric residual volume (GRV) that can lead to abdominal distention, vomiting, increased aspiration risk and consequently increased the length of hospital stay. In this study, investigators will evaluate Neostigmine's effect in reducing GRV in mechanically ventilated patients and compare its effect with metoclopramide and Ondansetron .
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Evaluation of Gastric Residual Volume(GRV)
Timeframe: 12 hours
Volume of the gastric antrum
Timeframe: 4 days