It has been shown that delayed gastric emptying and high GRV in critically ill patients are associated with increased mortality in these patients. Different kinds of drugs including metoclopramide, erythromycin and cisapride are used, but none of them had conclusive evidence of better eﬀects on each other. Moreover, complications such as dysrhythmia and extrapyramidal side eﬀects limit the use of these drugs.~Another drug that can be used to increase gastric emptying in critically ill patients is neostigmine. Although several studies have evaluated the efficacy of neostigmine on postoperative ileus, very few studies have evaluated the effect of this drug on GRV in ICU patients.~The aim of the current study will be to compare the effects of Neostigmine on gastric residual volume in mechanically ventilated patients in the intensive care unit. A comparative controlled study by Ondansetron.
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~.