NLE Gastrointestinal Nursing — Lower GI & Bowel DisordersRevision Notes

Exam Tips

• MEMORIZE: Abdominal assessment order = IAPP (Inspect, Auscultate, Percuss, Palpate). This is asked almost every NLE.
• When a question asks 'what should the nurse do FIRST during abdominal assessment?' — the answer is INSPECT.
• Normal bowel sounds = 5–35/min. If the question says sounds are below 5, suspect ileus; if above 35, suspect obstruction or diarrhea.
• Melena = UPPER GI bleed. Hematochezia = LOWER GI bleed (or very fast upper bleed). This distinction is almost always in NLE distractors.

Key Points

• The correct abdominal assessment order is: INSPECTION → AUSCULTATION → PERCUSSION → PALPATION (IAPP). This is the OPPOSITE of other body systems.
• Auscultation is done BEFORE palpation because manual pressure alters bowel sounds, making them inaccurate.
• Normal bowel sounds: 5–35 sounds per minute. Listen in all four abdominal quadrants.
• Hyperactive/borborygmi (loud gurgling) = early obstruction or diarrhea.
• Hypoactive or absent bowel sounds = paralytic ileus, peritonitis, or late obstruction. Listen for a FULL 5 minutes before documenting bowel sounds as absent.
• Inspection findings: Contour (flat, rounded, distended), symmetry, visible peristalsis, scars, pulsations.
• Percussion: Tympany over gas-filled bowel; dullness over solid organs or fluid-filled areas.
• Palpation: Light first, then deep. Assess for tenderness, guarding, rigidity, rebound tenderness (sign of peritonitis), and masses.
• MELENA (black, tarry, sticky, foul-smelling stool) = UPPER GI bleeding (blood digested as it passes through the GI tract).
• HEMATOCHEZIA (bright red blood per rectum) = lower GI bleeding OR brisk/massive upper GI bleeding.

Definitions

Section Title

GI Assessment: The Correct Order

Common Mistakes

• Performing palpation BEFORE auscultation — this is the most common error in NLE GI questions. Always auscultate first.
• Calling bowel sounds 'absent' after listening for only 1–2 minutes — the standard is 5 full minutes per quadrant.
• Confusing melena (upper GI) with hematochezia (lower GI) — remember: melena is dark and tarry because blood is digested over time.
• Forgetting to inspect BEFORE auscultation — the full order is IAPP: Inspection, Auscultation, Percussion, Palpation.

Exam Tips

• NLE frequently asks: 'Which instruction is MOST important for a patient with GERD?' — Answer: Elevate the head of the bed 6–8 inches AND remain upright 2–3 hours after meals.
• Barrett's esophagus = premalignant = requires endoscopic surveillance every 1–3 years. This is a high-yield complication.
• GERD trigger foods mnemonic: FAT CAT PM = Fatty foods, Alcohol, Tomato, Citrus, Alcohol again (avoid), Tobacco/smoking, Peppermint, Mint/chocolate.
• When GERD mimics cardiac pain in an NLE question — the priority intervention is to RULE OUT MI FIRST before treating reflux.
• Hiatal hernia type to FEAR: Rolling/Paraesophageal — risk of strangulation = surgical emergency. Sliding type = managed like GERD.

Key Points

• GERD is caused by backflow of acidic gastric contents into the esophagus due to an INCOMPETENT (weak/relaxed) lower esophageal sphincter (LES).
• Chronic, untreated GERD causes Barrett's esophagus — a metaplastic (abnormal tissue change) condition that is PREMALIGNANT for esophageal adenocarcinoma.
• Classic symptom: PYROSIS (heartburn) — burning retrosternal pain, WORSE after meals and when lying down or bending over.
• Other symptoms: regurgitation, sour/bitter taste, dysphagia (difficulty swallowing), chronic cough, hoarseness (acid irritates vocal cords), and nocturnal symptoms.
• GERD can mimic cardiac chest pain (angina). In the NLE, always consider ruling out MI first if chest pain is present.
• GOLD STANDARD diagnosis: 24-hour ambulatory pH monitoring (documents acid exposure time). EGD (esophagogastroduodenoscopy) visualizes mucosal damage.
• KEY nursing intervention: Elevate the head of the bed (HOB) 15–20 cm (6–8 inches) — use blocks under the bed legs, NOT just extra pillows.
• Patient must remain UPRIGHT for 2–3 hours after eating.
• Avoid eating within 3 hours of bedtime.
• Small, frequent meals reduce gastric distension and LES pressure.
• TRIGGER FOODS to avoid (lower LES tone or increase acid): Fatty/fried foods, chocolate, caffeine (coffee, tea, cola), alcohol, peppermint, citrus fruits, tomato products, carbonated beverages.
• Lifestyle modifications: STOP smoking (nicotine relaxes LES), LOSE WEIGHT (obesity increases intra-abdominal pressure), AVOID tight clothing around the abdomen.
• Hiatal hernia — most common type is the SLIDING type (presents like GERD). The ROLLING/PARAESOPHAGEAL type risks STRANGULATION (surgical emergency).
• Severe GERD or hiatal hernia refractory to medical management: NISSEN FUNDOPLICATION (surgical wrapping of the gastric fundus around the lower esophagus to strengthen the LES).

Definitions

Section Title

Gastroesophageal Reflux Disease (GERD)

Common Mistakes

• Recommending extra pillows to elevate the head — pillows only elevate the head and neck, not the entire upper body. Correct method: raise the HEAD OF THE BED using blocks (15–20 cm or 6–8 inches).
• Telling the patient to lie down and rest after meals — patients with GERD must stay UPRIGHT for 2–3 hours post-meal.
• Forgetting Barrett's esophagus as a complication of GERD — this is a premalignant complication frequently tested in the NLE.
• Overlooking atypical GERD symptoms like chronic cough, hoarseness, and asthma-like symptoms — acid irritates the larynx and airways.
• Allowing peppermint or spearmint as 'harmless' — these actually RELAX the LES and worsen reflux.

Exam Tips

• CLASSIC NLE QUESTION: Patient with PUD has sudden severe abdominal pain and a rigid abdomen — PRIORITY ACTION = NPO, call the physician, prepare for surgery (PERFORATION).
• Memorize the pain pattern distinction: Gastric = food WORSENS (G for 'Gets worse'); Duodenal = food RELIEVES (D for 'Diminishes pain').
• H. pylori diagnosis in NLE scenarios: The BEST test = urea breath test or stool antigen (non-invasive, confirms active infection). NOT serology.
• Most common complication of PUD = HEMORRHAGE (hematemesis, melena, dropping hemoglobin). Most dangerous = PERFORATION (surgical emergency).
• When answering NLE questions on PUD management — always include monitoring for bleeding as a priority nursing action.

Key Points

• A peptic ulcer is erosion of the GI mucosa (stomach = gastric ulcer; duodenum = duodenal ulcer) exposed to acid and pepsin.
• The two DOMINANT causes: (1) Helicobacter pylori (H. pylori) bacterial infection and (2) NSAID/aspirin use (damage the mucosal protective barrier).
• Other contributing factors: smoking, alcohol, corticosteroids, physiological stress.
• GASTRIC ULCER: Pain occurs 30–60 minutes AFTER eating; food WORSENS the pain; associated with WEIGHT LOSS; higher malignancy risk.
• DUODENAL ULCER: Pain occurs 2–3 hours after eating OR at night (nocturnal pain); food RELIEVES the pain (briefly); weight often stable or gain (patient eats to relieve pain).
• Classic symptoms: gnawing/burning EPIGASTRIC PAIN, dyspepsia, nausea.
• GOLD STANDARD diagnosis: EGD (upper endoscopy) with BIOPSY — visualizes the ulcer and biopsies for H. pylori and malignancy.
• H. pylori testing methods: Urea breath test, stool antigen test, biopsy urease test (most accurate). Serology confirms past exposure only, NOT active infection.
• CRITICAL: Stop PPIs 2 weeks and antibiotics/bismuth 4 weeks BEFORE urea breath test or stool antigen test — they cause FALSE NEGATIVE results.
• MAJOR COMPLICATIONS OF PUD: (1) HEMORRHAGE — most common complication; (2) PERFORATION — surgical emergency (sudden severe 'board-like' rigid abdomen); (3) GASTRIC OUTLET OBSTRUCTION (pyloric obstruction).
• Perforated ulcer: PRIORITY ACTIONS = NPO immediately, notify physician/surgeon, prepare for emergency surgery. The pain is sudden, severe, and the abdomen is RIGID ('board-like').
• Nursing priority: Monitor for bleeding — check stool color and consistency, vomitus, hemoglobin/hematocrit trends, and vital signs (tachycardia and hypotension = hemorrhage).
• Patient teaching: Avoid NSAIDs/aspirin, smoking, alcohol, caffeine; take medications as prescribed; eat small meals; report black tarry stools or blood-tinged vomitus immediately.

Definitions

Section Title

Peptic Ulcer Disease (PUD)

Common Mistakes

• Confusing gastric and duodenal ulcer pain patterns — GASTRIC: food WORSENS pain (30–60 min after eating); DUODENAL: food RELIEVES pain (pain 2–3 h after eating or at night).
• Forgetting to hold PPIs 2 weeks before H. pylori breath/stool tests — this is a classic NLE pharmacology pitfall.
• Thinking serology (H. pylori antibody test) confirms ACTIVE infection — serology only shows PAST EXPOSURE, not active infection.
• Prioritizing pain management BEFORE assessing for hemorrhage in a PUD patient — airway and circulation (Maslow: physiological safety) come FIRST.
• Not recognizing a perforated ulcer — the key sign is a SUDDEN severe pain with a RIGID ('board-like') abdomen. This is a surgical emergency, not a nursing problem to manage conservatively.

Exam Tips

• MNEMONIC for stress ulcers: 'Curling = Combustion (burns); Cushing = Cranial (brain)'
• Pernicious anemia = no intrinsic factor = B12 shots FOR LIFE. If an NLE option says 'oral B12 supplements' — that is WRONG for pernicious anemia.
• Stress ulcer prophylaxis priority patients: mechanically ventilated patients, severe burns, coagulopathy, major trauma → PPI or H2 blocker is the standard.
• NLE question pattern: 'A patient with severe burns develops melena and tarry stools' → think Curling's ulcer first.

Key Points

• Gastritis is inflammation of the gastric mucosa (stomach lining).
• ACUTE GASTRITIS: Caused by NSAIDs, aspirin, alcohol, spicy food, H. pylori, or bacterial/viral infections. Presents with sudden epigastric pain, nausea, vomiting.
• CHRONIC GASTRITIS: Often caused by H. pylori or AUTOIMMUNE destruction of gastric parietal cells.
• AUTOIMMUNE CHRONIC GASTRITIS destroys PARIETAL CELLS → Loss of INTRINSIC FACTOR → Cannot absorb Vitamin B12 → PERNICIOUS ANEMIA.
• Pernicious anemia treatment: LIFELONG Vitamin B12 injections (intramuscular). Oral B12 is INEFFECTIVE because intrinsic factor is absent.
• STRESS ULCERS: Acute gastric erosions in critically ill patients from mucosal ischemia.
• CURLING'S ULCER: Stress ulcer associated with SEVERE BURNS (due to hypovolemia and mucosal ischemia).
• CUSHING'S ULCER: Stress ulcer associated with BRAIN INJURY/RAISED INTRACRANIAL PRESSURE (due to vagal hyperstimulation → increased acid secretion).
• Stress ulcer PROPHYLAXIS in ICU: PPI or H2 blocker is standard for mechanically ventilated patients, those with coagulopathy, and severe burns.
• Early ENTERAL FEEDING (when tolerated) helps protect the gastric mucosa in critically ill patients.
• Management of gastritis: Remove the offending agent, acid suppression (PPI or H2 blocker), H. pylori eradication if positive.

Definitions

Section Title

Gastritis and Stress Ulcers

Common Mistakes

• Confusing Curling's and Cushing's ulcers: Curling's = Burns; Cushing's = Cranial (brain injury). Remember: Curling = fire/burns; Cushing = Cranium.
• Prescribing oral Vitamin B12 for pernicious anemia — without intrinsic factor, oral B12 cannot be absorbed. MUST give IM injections.
• Forgetting that autoimmune gastritis affects the PARIETAL CELLS specifically — these cells produce BOTH intrinsic factor AND hydrochloric acid.
• Overlooking stress ulcer prophylaxis in ICU scenarios — NLE often asks the nurse's priority for preventing GI bleeding in critically ill patients.

Exam Tips

• DRUG TIMING SUMMARY for NLE: PPIs = 30–60 min BEFORE meals; Antacids = 1–3 hours AFTER meals; Sucralfate = 1 hour BEFORE meals (empty stomach); H2 blockers = at BEDTIME.
• Penicillin allergy + H. pylori treatment = REPLACE amoxicillin with METRONIDAZOLE. This is a classic NLE pharmacology question.
• Metronidazole teaching: NO alcohol during treatment AND for 48–72 hours AFTER the last dose.
• NLE question: 'Patient on bismuth calls about black stools' — REASSURE; this is a normal, harmless side effect of bismuth.
• Antacids: Aluminum = constipation (Al-uminum Al-ways Constipates); Magnesium = diarrhea (Magnesium Makes you go).
• Long-term PPI use complications: Hypomagnesemia, low B12, fracture risk, C. difficile — tested in NCM pharmacology questions.

Key Points

• PROTON PUMP INHIBITORS (PPIs): Omeprazole (20–40 mg), Pantoprazole (40 mg), Esomeprazole (20–40 mg), Lansoprazole (30 mg) — all taken ONCE DAILY.
• PPIs: Take 30–60 MINUTES BEFORE the first meal of the day. They need food to activate the proton pumps they block.
• PPI LONG-TERM SIDE EFFECTS: Hypomagnesemia, low Vitamin B12, increased fracture risk (decreased calcium absorption), increased risk of C. difficile infection.
• H2-RECEPTOR ANTAGONISTS: Famotidine 20–40 mg. (Note: Ranitidine was WITHDRAWN from the market due to NDMA contamination.) Less potent than PPIs.
• H2 blockers: Give at BEDTIME for nocturnal acid suppression.
• ANTACIDS: Aluminum hydroxide (side effect: CONSTIPATION), Magnesium hydroxide (side effect: DIARRHEA). Usually combined (e.g., Maalox, Mylanta).
• Antacid timing: Give 1–3 HOURS AFTER MEALS and at bedtime.
• CRITICAL: Separate antacids from OTHER DRUGS by 1–2 HOURS — antacids impair absorption of many medications (tetracycline, fluoroquinolones, iron, digoxin).
• SUCRALFATE: 1 g FOUR TIMES DAILY (QID), taken on an EMPTY STOMACH — 1 hour before each meal and at bedtime. Forms a protective coating over the ulcer.
• Sucralfate must be SEPARATED from other drugs and antacids — it also impairs drug absorption.
• H. PYLORI TRIPLE THERAPY (14 days): PPI (BID) + Clarithromycin 500 mg BID + Amoxicillin 1 g BID.
• If PENICILLIN-ALLERGIC: Replace amoxicillin with METRONIDAZOLE 500 mg BID.
• BISMUTH QUADRUPLE THERAPY (10–14 days, for resistant/retreatment cases): PPI + Bismuth subsalicylate + Tetracycline + Metronidazole.
• METRONIDAZOLE: Absolutely NO ALCOHOL during treatment and 48–72 hours after — causes a DISULFIRAM-LIKE REACTION (severe flushing, vomiting, tachycardia, hypotension).
• BISMUTH: Causes BLACK STOOL and BLACK TONGUE — this is HARMLESS. REASSURE the patient.
• COMPLETE THE FULL COURSE of H. pylori therapy — stopping early leads to antibiotic resistance and relapse.
• DUMPING SYNDROME (post-gastrectomy): Rapid gastric emptying of hyperosmolar contents into the small intestine. Symptoms: early cramping, diarrhea, nausea, sweating (vasomotor symptoms). Management: Small, frequent, LOW-CARBOHYDRATE meals; take FLUIDS BETWEEN meals (not during); lie down for 20–30 min after meals.

Definitions

Section Title

Upper GI Pharmacology

Common Mistakes

• Taking PPIs WITH or AFTER meals — PPIs must be taken 30–60 minutes BEFORE the first meal to be effective (meal stimulates proton pumps that PPIs block).
• Taking antacids immediately with other medications — antacids must be separated by 1–2 hours from other drugs (tetracycline, fluoroquinolones, iron, digoxin absorption is impaired).
• Taking sucralfate with food — sucralfate must be taken on an EMPTY stomach for it to coat the ulcer properly.
• Allowing a patient on metronidazole to drink alcohol — the disulfiram-like reaction can be life-threatening.
• Reassuring a patient that bismuth side effects (black stool, black tongue) need medical attention — these are HARMLESS and the patient should be REASSURED.
• Stopping H. pylori triple therapy early because symptoms improved — MUST complete the FULL 14-day course to prevent antibiotic resistance.

Exam Tips

• NLE PRIORITY for upper GI bleeding = ABC: Airway → Breathing → Circulation. Insert two large-bore IVs, isotonic fluids, type and crossmatch, NPO, prepare for EGD.
• Coffee-ground vomitus = slower upper GI bleed (blood digested by acid). Bright red hematemesis = active, brisk arterial bleeding = more urgent.
• FIRST sign of shock = TACHYCARDIA (not hypotension — BP drops later). In NLE, if a GI bleeding patient develops tachycardia, recognize early shock.
• Esophageal varices = vasoactive drugs (octreotide/vasopressin) + endoscopic banding. Peptic ulcer = endoscopic clipping/cautery + IV PPI.
• NLE question: 'What is the MOST important nursing action for a patient with massive hematemesis?' — Position to prevent aspiration, maintain airway, then IV access and fluids.

Key Points

• CAUSES of upper GI bleeding (from most to less common): Peptic ulcer disease (MOST COMMON), esophageal/gastric varices (portal hypertension), erosive gastritis/esophagitis, Mallory-Weiss tear.
• MALLORY-WEISS TEAR: Longitudinal mucosal tear at the gastroesophageal junction caused by forceful, repeated vomiting (e.g., alcoholics, bulimia). Presents with hematemesis.
• ESOPHAGEAL VARICES: Dilated veins in the esophagus from portal hypertension (usually cirrhosis). Rupture causes MASSIVE hematemesis — life-threatening.
• KEY ASSESSMENT FINDINGS: Hematemesis (bright red OR 'coffee-ground' vomitus — coffee-ground = partially digested blood from slower bleeding), melena.
• 'COFFEE-GROUND' VOMITUS = blood that has been in the stomach long enough to be partially digested by acid — indicates slower upper GI bleeding.
• SIGNS OF HYPOVOLEMIC SHOCK: TACHYCARDIA (first sign), hypotension, cool/clammy skin, decreased urine output (<30 mL/hr), restlessness/confusion, falling hemoglobin and hematocrit.
• PRIORITY INTERVENTIONS — ABC framework (Maslow: Physiological Safety First):
• 1. AIRWAY: Position patient to prevent aspiration; suction if needed; high-flow oxygen via face mask.
• 2. BREATHING: Assess respiratory rate and effort; maintain O2 saturation.
• 3. CIRCULATION: Insert TWO LARGE-BORE IV LINES (18 gauge or larger for rapid fluid resuscitation). Infuse ISOTONIC FLUIDS (0.9% Normal Saline or Lactated Ringer's). Type and crossmatch for blood transfusion. Transfuse PRBCs as ordered.
• 4. NPO status — nothing by mouth.
• 5. Insert NGT as ordered (for gastric lavage or decompression).
• 6. Monitor vital signs, urine output, and hemoglobin/hematocrit continuously.
• 7. Prepare for EMERGENCY ENDOSCOPY (EGD) — both diagnostic and therapeutic (clipping, electrocautery, variceal banding).
• 8. Administer IV PPI infusion as ordered (e.g., pantoprazole 80 mg IV bolus then continuous infusion).
• VASOPRESSIN (Octreotide/Somatostatin analogs): Used specifically for VARICEAL bleeding — reduces portal pressure.
• SENGSTAKEN-BLAKEMORE TUBE: Balloon tamponade used for uncontrolled variceal bleeding (inflates esophageal and gastric balloons to compress varices) — temporary measure, high risk of aspiration.

Definitions

Section Title

Upper GI Bleeding: Priority Nursing Management

Common Mistakes

• Prioritizing comfort or pain relief before addressing ABC in upper GI bleeding — Maslow's physiological safety (airway, breathing, circulation) ALWAYS comes first.
• Using small-bore IV catheters for upper GI bleeding — TWO LARGE-BORE IVs (18G or larger) are needed for rapid fluid resuscitation and blood transfusion.
• Using hypotonic fluids (0.45% NaCl or D5W) for fluid resuscitation — must use ISOTONIC fluids (0.9% NaCl or Lactated Ringer's) for effective volume expansion.
• Forgetting to type and crossmatch in upper GI bleeding — this is a priority collaborative order to prepare for blood transfusion.
• Allowing oral intake before endoscopy — patient must remain NPO for emergency endoscopy.

Exam Tips

• NLE QUESTION: 'How does the nurse BEST confirm NGT placement?' — X-ray (gold standard for initial). For ONGOING confirmation = aspirate + check pH (should be ≤5.5). Auscultation alone = UNRELIABLE.
• Patient cannot speak during NGT insertion = PULL IT OUT IMMEDIATELY — tube is in the airway.
• NGT suction → loses HCl → metabolic ALKALOSIS + hypokalemia + hypochloremia. Remember: losing acid = becoming MORE alkaline.
• HOB elevation: 30–45° during tube feedings (aspiration prevention). GERD/hiatal hernia: 15–20 cm (6–8 inches) elevation of the bed FRAME (not just the head of the mattress).
• NEX measurement = Nose-Earlobe-Xiphoid. This is the standard pre-insertion measurement — memorize the landmarks.

Key Points

• INDICATIONS for NGT: Gastric decompression (obstruction, post-op ileus), enteral feeding, gastric lavage (upper GI bleed), medication administration, and gastric specimen collection.
• MEASUREMENT: NEX measurement (Nose → Earlobe → Xiphoid process) determines the length to insert the NGT to reach the stomach.
• INSERTION TECHNIQUE: Head slightly FLEXED FORWARD (chin toward chest). Ask the patient to SWALLOW or SIP WATER as the tube passes the oropharynx — this opens the esophagus and closes the trachea.
• STOP AND WITHDRAW immediately if: patient coughs, chokes, cannot speak (voice change), becomes cyanotic, or shows respiratory distress — tube may be in the AIRWAY.
• VERIFYING NGT PLACEMENT — GOLD STANDARD: CHEST/ABDOMINAL X-RAY. Required for initial confirmation of tube placement.
• BEDSIDE VERIFICATION (before each use): ASPIRATE gastric contents and CHECK pH. Gastric aspirate should be ACIDIC (pH ≤ 5.5).
• The OLD METHOD of injecting air and auscultating (the 'whoosh' test) is UNRELIABLE and NO LONGER RECOMMENDED as the sole method of confirmation — it can MISS misplacement.
• For FEEDING TUBES: Check RESIDUAL VOLUME before each feeding. If residual is high (>200–500 mL depending on policy), HOLD the feeding and reassess.
• Keep HEAD OF BED (HOB) elevated at 30–45° during and AFTER tube feedings to PREVENT ASPIRATION.
• For DECOMPRESSION (post-op ileus, obstruction): Connect to LOW INTERMITTENT SUCTION as ordered. Monitor the color, consistency, and amount of drainage.
• Complications of NGT: Aspiration pneumonia, sinusitis, mucosal irritation/erosion, esophageal perforation (rare), electrolyte imbalances (from suction — loss of HCl causes metabolic alkalosis, hypokalemia, hypochloremia).
• NGT SUCTION causes loss of hydrochloric acid (HCl) → METABOLIC ALKALOSIS + HYPOKALEMIA + HYPOCHLOREMIA — monitor electrolytes.
• Provide MOUTH CARE frequently (every 2–4 hours) for patients with NGT — mouth breathing causes dryness and promotes oral bacterial growth.
• Secure the NGT to the NOSE (not the forehead) to prevent pressure injury to the nostril.

Definitions

Section Title

Nasogastric Tube (NGT) Management

Common Mistakes

• Relying solely on the 'whoosh' (air auscultation) method to confirm NGT placement — this is NO LONGER the recommended sole method. X-ray is gold standard; pH testing is the recommended bedside method.
• Inserting the NGT with the patient's head EXTENDED (neck back) — the head should be FLEXED FORWARD to reduce risk of airway insertion.
• Continuing NGT insertion when the patient coughs, gags excessively, or cannot speak — STOP and REMOVE; the tube may be in the trachea.
• Not elevating the HOB during and after tube feedings — head must be at 30–45° to prevent aspiration.
• Forgetting to monitor electrolytes in patients on continuous NGT suction — prolonged suction causes metabolic alkalosis, hypokalemia, and hypochloremia.