Gastric suction plays a significant role in perioperative management, particularly in patients undergoing anesthesia who are at risk for regurgitation, aspiration, or gastric distention. Although modern fasting guidelines and pharmacologic prophylaxis have reduced aspiration risk in elective procedures, gastric suction remains an important procedure in selected cases. Its use requires careful clinical judgment, balancing benefits with potential complications such as mucosal trauma or electrolyte disturbance.
One of the primary indications for gastric suction during anesthesia is the prevention of pulmonary aspiration. Patients with delayed gastric emptying, bowel obstruction, trauma, pregnancy, morbid obesity, diabetes with autonomic neuropathy, or inadequate fasting are at increased risk of regurgitating gastric contents during induction and airway manipulation. Placement of a nasogastric or orogastric tube allows the removal of liquid and particulate matter before or after induction, reducing gastric volume and intragastric pressure. While suctioning does not eliminate aspiration risk entirely, it can significantly decrease the burden of gastric contents available for reflux, particularly in emergency surgery where fasting status cannot be controlled.
Gastric suction is also used to facilitate ventilation and surgical exposure during anesthesia. During mask ventilation, positive pressure may insufflate the stomach, leading to gastric distention. Increased gastric volume can elevate the diaphragm, decrease lung compliance, and impair effective ventilation. In such cases, decompression via an orogastric tube improves respiratory mechanics and oxygenation. This is particularly relevant in laparoscopic surgery, where pneumoperitoneum further compromises diaphragmatic excursion. Gastric decompression prior to trocar insertion also reduces the risk of gastric injury and improves visualization of upper abdominal structures.
In gastrointestinal surgery, especially procedures involving the stomach, small bowel, or pancreas, intraoperative gastric suction helps maintain a decompressed operative field. In bariatric surgery, gastric tube placement may assist with identification of anatomical landmarks, calibration of gastric sleeves, and leak testing. Similarly, in esophageal surgery, gastric decompression limits tension on anastomoses and reduces the risk of contamination.
Another important application is in the management of ileus or bowel obstruction. Patients with mechanical obstruction frequently present with significant gastric distention and ongoing vomiting. Induction of anesthesia in these patients carries high aspiration risk. Pre-induction gastric suctioning through a wide-bore nasogastric tube is considered essential to reduce intragastric volume. In some cases, continuous suction is maintained throughout the procedure to prevent reaccumulation of secretions.
Gastric suction also helps minimize postoperative nausea and vomiting in selected high-risk individuals. Although not routinely recommended for this purpose alone, in some cases, decompression at the conclusion of surgery may reduce gastric distention and residual blood ingestion, both of which can contribute to emesis. This is particularly relevant after oropharyngeal or nasal surgery, where blood from the surgery may accumulate in the stomach.
Gastric suction must always be performed with attention to potential complications. Blind insertion of nasogastric tubes may cause epistaxis, esophageal perforation, or misplacement into the airway. In patients with skull base fractures, nasal insertion is contraindicated. Excessive or prolonged suctioning can lead to mucosal injury, bleeding, or significant losses of hydrogen and chloride ions, contributing to metabolic alkalosis. Therefore, suction settings should be appropriate, and tube position should be confirmed.