Gastrointestinal Procedures and Devices

1. THE 2-MINUTE PHYSIOLOGY (Rapid Pathophysiology)

• The Core Mechanism: Gastrointestinal procedures and devices in the emergency department frequently center around managing the consequences of mechanical failures (e.g., gastrostomy tube dislodgement), acute obstructive processes (esophageal foreign bodies), or catastrophic hemorrhagic emergencies requiring mechanical intervention (e.g., balloon tamponade for varices).
• The Cellular/Mechanical Breakdown:
• Gastrostomy Tube (G-Tube) Dislodgement: The gastric stoma is a highly dynamic, unepithelialized or partially epithelialized tract. Once a G-tube is removed, the stoma begins to contract and close almost immediately. Failure to rapidly stent this tract leads to complete closure, preventing enteral access and precipitating acute hypoglycemia or the accumulation of toxic metabolites, particularly in pediatric or metabolically fragile patients.
• Variceal Hemorrhage: Portal hypertension drives the development of thin-walled, engorged collateral vessels in the distal esophagus and proximal stomach. When these varices rupture, the bleeding is massive and arterial in behavior. If vasoactive medications and endoscopy fail, rapid mechanical compression via balloon tamponade is required to physically halt the exsanguination.
• Esophageal Impaction: A food bolus lodging in the esophagus causes severe local spasm and stasis. Prolonged impaction risks mucosal ischemia, transmural necrosis, and esophageal perforation.

2. THE BEDSIDE ACTION PLAN (Rapid ER Management)

• G-Tube Dislodgement Rescue: Immediate stoma maintenance is critical. Do not delay intervention to wait for specialty consultation, transfer, or specific replacement equipment. Immediately insert a simple urinary (Foley) catheter into the stoma to maintain tract patency and allow for critical feeding and fluid access.
• Esophageal Food Bolus: Administer Glucagon as a first-line medical therapy to relax the lower esophageal sphincter, though its efficacy is variable. If medical therapy fails, emergent endoscopy is the gold standard intervention.
• Massive Variceal Hemorrhage & Balloon Tamponade:
• Stabilization: Intubate early for airway protection.
• Resuscitation: Initiate a balanced massive transfusion protocol using a 1:1:1 ratio of PRBCs, platelets, and FFP if greater than 4 units of PRBCs are anticipated.
• Mechanical Control: If the patient remains unstable despite resuscitation and octreotide, insert a Sengstaken-Blakemore or Minnesota tube to achieve balloon tamponade of the gastroesophageal varices.

3. THE DIAGNOSTIC GRID (Differential Diagnosis & Workup)

• "Can't-Miss" Mimics & Complications:
• Esophageal Perforation (Boerhaave Syndrome): Must be ruled out in any patient with a food bolus or after instrumentation.
• Hypoglycemia: The most critical, immediate life threat in a pediatric patient presenting with a dislodged feeding tube who has missed feedings.
• Intraperitoneal Tube Placement: A mispositioned G-tube replacement can infuse feeding directly into the sterile peritoneum, causing fatal chemical peritonitis.
• Prioritized Diagnostic Workup:
• Point-of-Care (POC) Glucose: Mandatory immediately upon arrival for any patient with a dislodged G-tube.
• Coagulation Panels: Obtain a PT/INR and PTT in suspected GI bleeders, but recognize that in cirrhotic liver failure, these are poorly representative of actual bleeding risk.
• Diagnostic Peritoneal Lavage / Paracentesis Fluid Analysis: Cell count, Gram stain, and culture to diagnose spontaneous bacterial peritonitis or viscus perforation.

4. THE VISUAL BOARD (ECG / POCUS / Imaging)

• Point-of-Care Ultrasound (POCUS): Utilize ultrasound for procedural guidance prior to performing an abdominal paracentesis. Ensure you identify the largest, most accessible pocket of ascites while simultaneously mapping out and avoiding the inferior epigastric vessels and floating loops of bowel.
• Contrast Esophagogram: If evaluating for an esophageal perforation following a procedure or foreign body, avoid barium. You must visually assess for extraluminal contrast extravasation using Gastrografin (a water-soluble contrast agent).
• Plain Radiography: Required after the blind placement of a nasogastric or replacement gastrostomy tube. Visually confirm that the radiopaque tip of the tube is positioned clearly below the diaphragm and within the gastric bubble prior to initiating any enteral feeding or medications.

5. THE SCORING MATRIX (Risk Stratification & Guidelines)

• Glasgow-Blatchford Score (GBS): The preeminent risk stratification tool for upper gastrointestinal bleeding. It utilizes BUN, hemoglobin, systolic blood pressure, heart rate, and presentation characteristics (melena, syncope, hepatic disease, heart failure) to dictate disposition.
• Cutoff Action: A GBS > 0 typically mandates hospital admission and urgent gastroenterology consultation. A low-risk score of 0 allows for safe discharge with outpatient endoscopic follow-up.

6. THE DANGER ZONE (Pitfalls & Critical Actions)

• Deadly Cognitive Trap (Waiting for the "Right" Tube): A classic error is delaying the replacement of a dislodged gastrostomy tube because the exact button or device is not available in the ED. Critical Action: The tract will close rapidly. You must insert a Foley catheter immediately to save the stoma.
• Deadly Cognitive Trap (Papain for Food Boluses): Attempting to use enzymatic degradation (e.g., meat tenderizer/papain) to dissolve an impacted meat bolus in the esophagus. Critical Action: This is strictly contraindicated. Papain will digest the esophageal wall and lead to catastrophic esophageal perforation.
• Procedural Pitfall (Over-correcting Coagulopathy): Reflexively treating an elevated INR in a cirrhotic patient with an active variceal bleed using Fresh Frozen Plasma (FFP) or Prothrombin Complex Concentrate (PCC). Critical Action: Empirically correcting an abnormal PT/INR with FFP/PCC can actually increase bleeding by acutely worsening portal hypertension via volume overload. Avoid routine use unless the patient requires a massive 1:1:1 transfusion.

7. MCQ MASTERCLASS (Written Exam Tips)

• The Food Bolus Distractor: A board question will present a patient with a steak impaction in the esophagus. The options will include Glucagon, Nitroglycerin, Nifedipine, and Papain. Correction: Glucagon is the best medical option, but the question may ask what is contraindicated. The answer is Papain, due to the risk of esophageal rupture.
• The Tube Replacement Fix: A mother brings in her 2-year-old child because his G-tube fell out 30 minutes ago. The stem notes the specific replacement device is locked in the closed central supply room. Answer: Insert a urinary (Foley) catheter to maintain the tract.
• The Coagulopathy Distractor: A patient with cirrhosis and a massive upper GI bleed has an INR of 2.5. The distractor is "Administer FFP to normalize INR." Correction: INR is poorly representative of bleeding risk in cirrhosis. Treat with target-driven 1:1:1 massive transfusion protocols and target portal pressures (octreotide, balloon tamponade) rather than chasing a normal INR.

8. THE BOARDROOM SCRIPT (OSCE & Oral Board Tips)

• The Immediate Action Hook: "Given the patient's presentation with a dislodged gastrostomy tube, this is a time-sensitive procedural emergency. My immediate priority is to obtain a STAT point-of-care blood glucose to rule out hypoglycemia. Simultaneously, I will insert a standard Foley catheter into the stoma, inflate the balloon, and secure it to prevent tract closure, without delaying care to consult surgery."
• The Resuscitation Command (For Bleeding): "For this crashing cirrhotic patient with massive hematemesis, I will immediately secure the airway via rapid sequence intubation to prevent aspiration. I am activating the massive transfusion protocol for a 1:1:1 ratio of PRBCs, platelets, and FFP, specifically avoiding isolated FFP administration to prevent worsening portal hypertension."
• The Procedural Pivot: "Because the variceal hemorrhage remains refractory to medical therapy with octreotide and blood products, I will prepare for emergency balloon tamponade utilizing a Sengstaken-Blakemore tube, and emergently consult Gastroenterology and General Surgery for definitive control."