Gastroenterology is thebranch of medicine that focuses on
the diagnosis and treatment of diseases of the
gastrointestinal (GI) tract, including the esophagus,
stomach, intestines, liver, gallbladder, and pancreas.
Function Description
Ingestion Takingin food through the mouth
Digestion Breaking down food into smaller molecules (mechanical +
chemical)
Absorption Nutrients from digested food are absorbed into the blood (mostly
in the small intestine)
Secretion Digestive enzymes, acids (like HCl), bile, and mucus are secreted
to aid digestion
Motility (Peristalsis) Coordinated muscular contractions move food through the GI
tract
Excretion (Defecation) Removal of undigested food and waste products via the rectum
as feces
Immune Function The GI tract contains gut-associated lymphoid tissue (GALT) to
protect against pathogens
Organ Function
Mouth Chewing(mechanical digestion), salivary enzyme action (amylase)
Esophagus Moves food to stomach via peristalsis
Stomach Stores food, secretes acid (HCl), digests protein (pepsin), churns food
Liver Produces bile to digest fat, detoxifies substances
Gallbladder Stores and releases bile
Pancreas Secretes digestive enzymes and bicarbonate into small intestine
Small Intestine Major site of digestion and absorption of nutrients
Large Intestine (Colon) Absorbs water and electrolytes, forms stool
Rectum and Anus Stores and expels feces
Risk Factor Impacton GI System
Food/Drug Allergies Can trigger GI inflammation, nausea, vomiting, or diarrhea
Cardiac, Respiratory, Endocrine Disorders May slow GI motility → constipation or delayed emptying
Chronic Alcohol Use Damages mucosa → gastritis, pancreatitis, liver disease
Chronic Stress Affects GI motility → ulcers, IBS, indigestion
Chronic Laxative Use Leads to dependency and decreased natural bowel function
Chronic NSAID/Aspirin Use Causes mucosal erosion → ulcers, gastritis, bleeding
Diabetes Mellitus Increases risk of oral candidiasis, gastroparesis, constipation
Family History of GI Disorders Increases risk of IBD, colorectal cancer, GERD
Long-Term GI Disorders (e.g., UC) Raises risk of colorectal cancer
Neurological Disorders Affects chewing, swallowing, or peristalsis
Previous Abdominal Surgery/Trauma Can cause adhesions → bowel obstruction or altered motility
Tobacco Use Increases acid, delays healing, promotes GI malignancies
Gastro esophageal RefluxDisease (GERD)
Gastro esophageal reflux is the backward flow of gastric content into
the esophagus
Signs and symptoms
Heartburn after meals, while bending over, or recumbent
May have regurgitation of sour materials in mouth, pain with
swallowing
Dyspepsia or indigestion
Atypical chest pain
Sore throat with hoarseness
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18.
Diagnosis
a. Barium swallow(evaluation of esophagus, stomach, small
intestine)
b. Upper endoscopy: direct visualization; biopsies may be
done
a.24-hour ambulatory pH monitoring
Medical management
Antacids for mild to moderate symptoms, e.g. Maalox, Mylanta,
Gaviscon
b. H2-receptor blockers: decrease acid production. e.g.
cimetidine, ranitidine, famotidine, nizatidine
c. Proton-pump inhibitors: reduce gastric secretions, promote
healing of esophageal erosion and relieve symptoms, e.g.
omeprazole (prilosec); lansoprazole
b.Promotility agent: enhances esophageal clearance and gastric
emptying
e.g metachlopromide
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19.
Nursing management
a. Eliminationof acid foods (tomatoes, spicy, citrus foods, coffee)
b. Avoiding food which relax esophageal sphincter or delay gastric
emptying (fatty foods, chocolate, alcohol)
c. Maintain ideal body weight
d. Eat small meals and stay upright 2 hours post eating; no eating 3
hours prior to going to bed
e. Elevate head of bed on 6 – 8 blocks to decrease reflux
f. No smoking
a.Avoiding bending and wear loose fitting clothing
b.Drink adequate fluids at meals to increase food passage
c.Decrease the intake of highly seasoned foods
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20.
Gastritis
• Inflammation ofthe stomach lining (gastric mucosa) caused by
irritants or infection.
Category Examples
Medications NSAIDs, corticosteroids (↑ acid, ↓
mucus)
Infection H. pylori (most common chronic
cause)
Lifestyle Alcohol, caffeine, smoking, stress
Autoimmune Chronic gastritis (↑ risk of cancer)
CAUSES
21.
Signs & Symptoms:
Epigastricpain or burning (esp. after eating)
Nausea/Vomiting
Bloating
Loss of appetite
Hematemesis (vomiting blood – red or coffee-ground)
Melena (black tarry stools – indicates GI bleed)
22.
Nursing Interventions:
Action Why/
NPOduring acute symptoms Rest GI tract
Monitor for GI bleeding Look for hematemesis, melena, ↓ Hgb
Avoid irritants No alcohol, caffeine, spicy foods, smoking
Administer meds as ordered PPIs (omeprazole), H2 blockers (ranitidine), antacids
If H. pylori positive Start triple therapy: PPI + 2 antibiotics
23.
Medications
Class Examples NCLEXNote
PPI Omeprazole ↓ acid, promote healing
H2 Blockers Ranitidine ↓ acid, often used with PPIs
Antacids Aluminum/Mg Hydroxide Neutralize acid
Antibiotics Amoxicillin, Clarithromycin,
Metronidazole
For H. pylori eradication
• A rapidemptying of stomach contents into the small intestine after
gastric surgery (e.g., gastrectomy, gastric bypass).
Types:
Type Timing Features
Early 15–30 mins after meals GI symptoms (nausea, diarrhea,
cramping, bloating)
Late 1.5–3 hrs after meals Hypoglycemia symptoms
(sweating, weakness, dizziness,
confusion)
Management:
Eat small, frequentmeals
High-protein, low-carb diet
Avoid fluids with meals (drink 30–60 min before/after)
Lie down after eating (to slow gastric emptying)
Avoid sugar, salt, dairy, and high-fat foods
28.
Vitamin B12 Deficiency
(CobalaminDeficiency)
• Function of Vitamin B12 (Cobalamin):
• DNA synthesis
• RBC production (prevents megaloblastic anemia)
• Maintains nerve function (myelin sheath)
Hiatal Hernia
• Partof the stomach pushes through the diaphragm into the chest cavity
🔹 Types:
•Sliding (common): Stomach moves up with position changes → GERD
symptoms
•Rolling (paraesophageal): Stomach rolls beside esophagus → risk of
strangulation
• Management:
• Smallmeals, avoid lying after eating
• Elevate head of bed
• Avoid spicy/fatty foods
• Meds: Antacids, PPIs, H2 blockers
• Surgery: Nissen fundoplication (if severe/rolling)
36.
Diverticulosis vs Diverticulitis
FeatureDiverticulosis Diverticulitis
Definition Pouches (diverticula) in colon wall Inflammation/infection of diverticula
Cause Low-fiber diet, aging Food/bacteria trapped in diverticula
Symptoms Usually asymptomatic LLQ pain, fever, nausea, constipation or
diarrhea
Complications Bleeding, diverticulitis Abscess, perforation, peritonitis, fistula
37.
Diagnosis:
CT scan withcontrast
Colonoscopy (only for diverticulosis; avoided during active diverticulitis)
Management:
Diverticulosis:
High-fiber diet (fruits, vegetables, whole grains)
↑ Fluids
Avoid nuts/seeds (controversial)
38.
Diverticulitis:
NPO or clearliquids (rest bowel)
Antibiotics
Pain management
Surgery if severe (recurrent, abscess, perforation)
NCLEX Tip:
If the question says LLQ pain + fever + ↑ WBC, think diverticulitis
39.
Inflammatory Bowel Disease(IBD)
• Chronic inflammatory disorders of the GI tract, mainly:
• Crohn’s disease
• Ulcerative colitis (UC)
40.
• Crohn’s Disease
•A chronic inflammatory bowel disease (IBD) that causes inflammation anywhere in
the GI tract – from mouth to anus
• Ulcerative Colitis
• A chronic inflammatory bowel disease (IBD) causing continuous inflammation of
the colon and rectum
• Starts in rectum and moves upward (distal to proximal)
41.
Crohn's Disease (regionalenteritis)
A type of inflammatory bowel disease
Most commonly affects small bowel especially terminal ileum
Edema, inflammation and fibrosis occur in all layers of bowel wall
Signs and symptoms
Continuous or episodic diarrhea; liquid or semi-form
abdominal pain and tenderness in RLQ relieved by defecation
Fever, dehydration
Steatorrhea
Electrolyte imbalance
Fatigue, malaise
Weight loss, anemia
Fissures, fistulas, abscesses
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Feature Crohn’s DiseaseUlcerative Colitis
Location Anywhere mouth to anus
(commonly ileum)
Colon & rectum only
Symptoms Diarrhea, weight loss, abdominal
pain (RLQ)
Bloody diarrhea, urgency, cramping
(LLQ)
Complications Fistulas, strictures, malnutrition Toxic megacolon, perforation, colon
cancer
Surgery Not curative Curative (total colectomy)
Comparison Table:
44.
• Management (Both):
Diet:Low-residue, high-protein, high-calorie
Medications:
Aminosalicylates (e.g., sulfasalazine)
Corticosteroids
Immunosuppressants
Biologics (e.g., infliximab)
Surgery if unresponsive or complications
45.
Hemorrhoids
• Swollen, inflamedveins in the rectum or anus caused by increased pressure.
🔹 Types:
Type
Location Symptoms
Internal Inside rectum Painless bleeding with stool
(bright red), mucus
External Outside anus Pain, swelling, itching,
bleeding
NCLEX Tip:
Painless bleeding= internal
Painful swelling = external
Focus on fiber, fluids, stool softeners in teaching
50.
Appendicitis
• Inflammation ofthe vermiform appendix, usually due to obstruction (fecalith,
infection, or foreign body).
• Symptoms:
Initial: Dull periumbilical pain
Later: Sharp RLQ pain (at McBurney’s point)
Rebound tenderness
Nausea, vomiting
Low-grade fever
Anorexia
↑ WBC (mild to moderate)
52.
Roving's sign
Deep palpationof the left iliac fossa may cause pain in the right
iliac fossa.
Psoas sign
The patient will lie with the right hip flexed for pain relief.
Obturator sign
Spasm of the muscle can be demonstrated by flexing and internally
rotating the hip.
Medical Management:
1. IV fluids and antibiotics.
2. Appendectomy
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53.
• Diagnosis:
Clinical signs
↑WBC count
CT scan or ultrasound
Avoid rectal exam if suspected
• Avoid:
• No heat to abdomen
• No laxatives or enemas
• No deep palpation
(May cause rupture)
54.
• Management:
• NPO,IV fluids
• Pain meds only after diagnosis
• Antibiotics
• Surgery (appendectomy): Laparoscopic preferred
• Complications:
• Rupture → peritonitis → sepsis (life-threatening)
• Abscess
55.
NCLEX Tip:
Sudden painrelief = rupture!
Prep for surgery, maintain NPO, monitor for peritonitis
• Types ofViral Hepatitis (A–E):
Type
Transmission Key Points Chronic?
A Fecal–oral (contaminated
food/water)
Acute only, vaccine
available
❌ No
B Blood, sex, perinatal Vaccine available, can lead
to cirrhosis
✅ Yes
C Blood (IV drugs,
transfusion)
No vaccine, most become
chronic
✅ Yes
D Blood (requires Hep B
coinfection)
More severe with Hep B ✅ Yes
E Fecal–oral (common in
Asia)
Dangerous in pregnancy ❌ No (usually)
• Management:
• Rest,hydration
• Nutrition: High-calorie, low-fat
• Avoid alcohol, hepatotoxic drugs (e.g., acetaminophen)
• Antivirals for B and C
• Vaccines: A & B
• Post-exposure prophylaxis: immune globulin for A & B
60.
• NCLEX Tips:
HepA & E = fecal-oral → hand hygiene, safe food
Hep B, C, D = bloodborne → gloves, avoid needle sticks
Chronic = monitor for cirrhosis, liver cancer
61.
• Client Education
Rest,hydrate, high-calorie low-fat diet
Avoid alcohol & acetaminophen
Practice good hand hygiene
No sharing of razors, toothbrushes
Use condoms, safe sex
• 🔹 Hep A & E (Fecal–oral):
• Wash hands after toilet, before eating
• Drink clean water, avoid raw/unsafe food
• Hep A vaccine available
62.
• Hep B,C, D (Bloodborne):
• Avoid sharing needles
• Use condoms
• Hep B vaccine (also protects from D)
• Tip:
• Prevent spread, protect liver, avoid alcohol.
63.
Bariatric Surgery
• Surgicalprocedures for weight loss by restricting food intake and/or nutrient
absorption
• 🔹 Types:
Type Mechanism Example
Restrictive Reduces stomach size Gastric sleeve, gastric band
Malabsorptive Bypasses intestines Biliopancreatic diversion
Combined Restriction + bypass Roux-en-Y gastric bypass
• Client Education:
Eatsmall, frequent meals
Chew food thoroughly
Avoid sugar, fat, and fluids with meals
Lifelong vitamin supplements (B12, iron, calcium,
multivitamins)
Watch for signs of dumping syndrome
Avoid NSAIDs & alcohol
66.
NCLEX Tip:
After surgery:NPO → clear liquids → pureed → soft foods
B12 injections may be needed long-term
67.
CHOLECYSTITIS
• Inflammation ofthe gallbladder, usually due to gallstones
(cholelithiasis) blocking the cystic duct.
🔹 Causes
Gallstones (most common)
Acalculous (no stones, seen in trauma, burns, sepsis)
Fat, Forty, Female, Fertile, Fair (classic risk factors)
68.
• Key Signs& Symptoms
Symptom Description
RUQ pain Especially after fatty meals
Murphy’s sign Pain during inspiration when RUQ is palpated
Referred pain Right shoulder or scapula
Fever, chills Indicates infection
Jaundice
If bile duct obstructed
•Nursing Interventions:
Intervention
Rationale
NPO statusRest GI tract, prepare for surgery
IV fluids Prevent dehydration
Pain management Opioids as prescribed
Antiemetics For nausea/vomiting
Monitor for complications (e.g., peritonitis, sepsis)
Educate post-op Low-fat diet, wound care
71.
• 🔹 SurgicalOption:
• Laparoscopic cholecystectomy (gold standard)
• Ambulation post-op helps with gas pain
• Watch for signs of infection or bile leak
• 🔹 NCLEX Alert: Fatty food triggers and Murphy’s sign often appear on
exams!
73.
PEPTIC ULCER DISEASE
(PUD)
•Peptic ulcers are sores in the lining of the stomach or duodenum
caused by erosion from gastric acid and pepsin.
Type
Location
Gastric ulcer Lining of stomach
Duodenal ulcer First part of duodenum (small intestine)
Main Types:
Feature Gastric UlcerDuodenal Ulcer
Pain timing 30–60 min after eating
(during meals)
1.5–3 hrs after eating (when fasting)
Food effect Worsens pain Relieves pain
Night pain Less common Common
Vomiting May relieve pain Not common
Risk for cancer ↑ Higher ↓ Lower
Hemorrhage risk Higher risk Present but lower
Body weight May cause weight loss Often normal weight
Gastric vs Duodenal Ulcer:
Postoperative Interventions –Gastric Surgery
a. Monitor vital signs – watch for bleeding, infection
b. Fowler’s position – promotes comfort & drainage
c. IV fluids/electrolytes – maintain balance, monitor I&O
d. Assess bowel sounds – return of peristalsis
e. Monitor NG suction – do not reposition/irrigate unless prescribed
f. NPO 1–3 days – until bowel sounds return
g. Diet progression – NPO → sips of water → small bland meals
PANCREATITIS
• Acute orchronic inflammation of the pancreas which is Caused by escape
of digestive enzymes into surrounding tissue → self-digestion
• Acute Pancreatitis
– Sudden onset
– Can be single or recurrent attacks with complete resolution
• Chronic Pancreatitis
– Ongoing inflammation
– Leads to permanent damage, with scar tissue replacing pancreatic tissue
Signs & Symptoms:
SymptomsDescription
Epigastric pain Radiates to back, worse when lying down, better when leaning forward
N/V Common
Fever, tachycardia Inflammatory response
Abdominal distension ↓ Bowel sounds
Cullen’s sign Bluish discoloration around umbilicus
Grey Turner’s sign Bluish flank discoloration
88.
Diagnosis:
•↑ Amylase, ↑Lipase (lipase more specific)
•↑ WBC, ↑ glucose, ↑ triglycerides
•CT abdomen (most accurate imaging)
89.
Nursing Interventions:
Intervention
Rationale
NPO statusRest pancreas
IV fluids Prevent dehydration
Pain control Usually with opioids (e.g., morphine)
NG tube For vomiting or severe ileus
Electrolyte monitoring Especially calcium (↓ Ca = severe case)
Positioning Leaning forward relieves pain
🔹 Neurologic
• Asterixis(flapping tremor of hands)
• Confusion, disorientation
• Signs of hepatic encephalopathy
🔹 Reproductive
• Gynecomastia (male breast enlargement)
• Testicular atrophy
• Menstrual irregularities
102.
🔹 Other
• Peripheraledema (especially in lower extremities)
• Musty or sweet breath odor (fetor hepaticus)
• NCLEX Tip:
• Look for signs of portal hypertension, bleeding, encephalopathy, and
ascites.
103.
Nursing Care
🔹 1.Monitor & Assess
Vital signs, weight, abdominal girth (ascites)
Neurologic status (for hepatic encephalopathy)
Bleeding (gums, stool, bruising)
Labs: LFTs, ammonia, PT/INR, albumin
104.
🔹 2. DietaryManagement
Low-sodium diet (for ascites)
High-calorie, moderate-protein (unless encephalopathy →
low-protein)
Vitamin supplements (B-complex, A, D, E, K)
🔹 3. Prevent Complications
Position: Semi-Fowler’s (promote breathing)
Monitor for signs of esophageal varices bleeding
Administer lactulose (↓ ammonia)
Give diuretics (e.g., spironolactone) for ascites
Avoid hepatotoxic meds (e.g., acetaminophen)
105.
🔹 4. PromoteSkin Integrity
Use soft bedding, turn frequently
Apply lotions for itching
🔹 5. Client Education
Avoid alcohol, NSAIDs, and raw seafood
Importance of med compliance
Report signs of bleeding, confusion, jaundice
106.
Esophageal Varices
🔹 EsophagealVarices are:
Dilated veins in the lower esophagus
Caused by portal hypertension Often due to liver cirrhosis
Can rupture → life-threatening bleeding
🔹 Nursing Care
Monitorfor bleeding
Maintain NPO if bleeding
Prepare for endoscopy
Monitor vitals, CBC, coagulation
Educate to avoid alcohol and straining