Comparison of different methods of nasogastric tube insertion in anesthetized and intubated patients: A meta-analysis

Figure 1 Selection process of the studies included in the review.

Figure 2 Comparison between the conventional technique and the reverse Sellick’s maneuver in terms of successful first and overall insertions. RR: Relative risk; CI: Confidence interval.

Figure 3 Comparison between the conventional technique and neck flexion with lateral neck pressure in terms of successful first and overall insertions. RR: Relative risk; CI: Confidence interval.

Figure 4 Comparison between the placement of a normal nasogastric tube and frozen nasogastric tube in terms of successful first and overall insertions. RR: Relative risk; CI: Confidence interval.

Figure 5 Comparison between the conventional nasogastric tube placement technique and endotracheal tube-assisted placement in terms of successful first and overall insertions. RR: Relative risk; CI: Confidence interval.

Figure 6 Comparison between the conventional nasogastric tube placement technique and video-assisted placement in terms of successful first and overall insertions. RR: Relative risk; CI: Confidence interval.