gastroenterology_20150615044556 Flashcards
KEY enzyme that controls the rate-limiting step in prostaglandin synthesis
Cyclooxygenase (COX)
TWO principal gastric secretory products capable of inducing mucosal injury
Hydrochloric acid and pepsinogen
Duodenal ulcers occur MOST often in
FIRST portion of the duodenum (>95%)
Account for the MAJORITY of DUs
H. pylori and NSAID-induced injury
Benign Gus are MOST often found
Distal to the junction between the antrum and the acid secretory mucosa
MAJORITY of GUs can be attributed to either
H. pylori or NSAID-induced mucosal damage
Two factors that PREDISPOSE to higher colonization of H. pylori
Poor socioeconomic status and less education
Play a critical role in maintaining mucosal integrity and repair
Prostaglandins
MOST discriminating symptom in duodenal ulcer
Pain that awakes the patient from sleep (between midnight and 3 AM)
MOST frequent finding in patients with GU or DU
Epigastric tenderness
Most common complication observed in PUD
Gastrointestinal bleeding
SECOND-MOST common ulcer-related complication
Perforation
LEAST-common ulcer-related complication
Gastric outlet obstruction
MOST potent acid inhibitory agents available
Proton pump (H+ K+-ATPase) inhibitors
MOST common toxicity with sucralfate
Constipation
MOST common toxicity with prostaglandin analogues
Diarrhea
MOST feared complication with amoxicillin, clindamycin
Pseudomembranous colitis (Tx: oral vancomycin, IV metronidazole)
MOST common cause for treatment failure in COMPLIANT patients
Antibiotic-resistant strains
Test of CHOICE for documenting eradication of H. pylori
Urea breath test (UBT)
Operations MOST commonly performed for duodenal ulcers
- Vagotomy and drainage- Highly-selective vagotomy- Vagotomy with antrectomy
Treatment of CHOICE for an antral ulcer
Antrectomy (including the ulcer) with a Billroth I anastomosis
MOST frequent presenting complaint in recurrent ulceration
Epigastric abdominal pain
CORNESTONE of therapy for patients with dumping syndrome
Dietary modification
MOST commonly observed after truncal vagotomy
Post-vagotomy diarrhea
MAJORITY of gastrinomas occur within
Pancreas
MOST common nonpancreatic lesion (gastrinoma)
Duodenal tumors
MOST common cause of UGIB (50% of cases)
Peptic ulcers
FULL-THICKNESS tear of esophagus
Boerhaave Syndrome
PARTIAL-THICKNESS tear of esophagus
Mallory-Weiss tear
CLASSIC history of Mallory-Weiss tear
Vomiting, retching, coughing preceeding hematemesis
MOST important in the setting of hemorrhagic and erosive gastropathy (gastritis)
NSAIDs, alcohol, stress
Responsible for MAJORITY of cases of obscure GIB
Small intestinal sources of bleeding
MOST common cause of significant lower GIB in children
Meckel’s diverticulum
MOST common cause of LGIB
Hemorrhoids
In children and adolescents, MOST common colonic cause of significant GIB
IBD and juvenile polyps
BEST way to initially assess a patient with GIB
Heart rate and BP
Test of choice in UGIB
Upper endoscopy
Procedure of CHOICE in LGIB unless bleeding is too massive
Colonoscopy
Initial test for massive obscure bleeding
Angiography
CLASSIC symptoms of Gastroesophageal Reflux Disease (GERD)
Water brash and substernal heartburn
MOST sensitive test for diagnosis of GERD
24-hr ambulatory pH monitoring
MAJOR risk factor for adenocarcinoma
Barrett’s esophagus (metaplasia → squamous to columnar)
GOLD standard for confirmation of Barrett’s esophagus
Endoscopic biopsy
MOST common cause of esophageal chest pain
Gastroesophageal reflux
BEST test for the evaluation of proximal gastrointestinal tract
Endoscopy/Esophagogastroduodenoscopy (EGD)
Typical presentation of esophageal cancer
Progressive solid food dysphagia and weight loss
One of the MOST common causes of steakhouse syndrome
Schatzki ring
Cancer involving the middle 1/3 of the esophagus, associated with smoking
Esophageal squamous cell CA
Cancer involving the lower 1/3 of the esophagus, associated with GERD, Barrett’s esophagus
Esophageal AdenoCA
Characteristic symptom of infectious esophagitis
Odynophagia
Rule of 2’s in Meckel’s diverticulum
2% of the population2 y/o2 types of tissues involved2:1 M:F ratio2 in long2 ft from ileocecal valve
Charcot’s Cholangitic triad
Mnemonic: FPJ - Fever, abdominal Pain, Jaundice
Charcot’s Neurologic Triad of Multiple Sclerosis
Mnemonic: SIN - Scanning speech, Intentional tremor, Nystagmus
Reynold’s Pentad
In addition to Charcot’s Cholangitic triad, also includes shock and confusion
Rome Criteria for Irritable Bowel Syndrome
Recurrent abdominal pain or discomfort at least 3 days per month in the last three months associated with 2 or more of the following: improvement with defecation, onset associated with a change in frequency of stool, onset associated with a change in form (appearance) of stool
Triad of Hepatopulmonary Syndrome
Liver disease, Hypoxemia, Pulmonary Arteriovenous Shunting
Triad of Choledochal cyst
abdominal pain, jaundice, abdominal mass
Classic Triad of Hemobilia
Biliary pain, Obstructive jaundice, Melena or occult blood in stools
Diagnosis of acute pancreatitis REQUIRES TWO of the following
Typical abdominal pain3-fold or greater elevation in serum amylase and/or lipase levelConfirmatory findings on cross-sectional abdominal imaging
A TRIAD of findings should alert one to the possibility of HEMORRHAGE from a pseudocyst
Increase in the size of the massA localized bruit over the massSudden decrease in hemoglobin level and hematocrit without obvious external blood loss
Reduction in GFR with an elevation of serum creatinine level, but it is fairly stable
Type 2 HRS
Alteration in mental status and cognitive function occuring in the presence of liver failure
Hepatic (Portosystemic) Encephalopathy
Sudden forward voluntary movement of the wrist after it is bent back on an extended arm
Asterixis or liver flap
Clinically innocuous entity in which a partial or complete septum (or fold) separates the fundus from the body
Phrygian cap
Deep inspiration or cough during subcostal palpation of the RUQ usually produces increased pain and inspiratory arrest
Murphy’s sign
Triad of Acute Cholecystitis
Sudden onset of RUQ tendernessFeverLeukocytosis
Gallstone becomes impacted in the cystic duct or neck of the gallbladder causing COMPRESSION of the CBD, resulting in CBD obstruction and jaundice
Mirizzi’s syndrome
Gas within the gallbladder lumen in plain abdominal films, dissecting within the gallbladder wall to form a gaseous ring, or in the pericholecystic tissues
Emphysematous Cholecystitis
MAJOR intrahepatic radicles
Caroli’s disease
Passage of gallstones into the CBD
Choledocholithiasis
Presence of a palpably enlarged gallbladder suggests that the biliary obstruction is secondary to an underlying malignancy rather than to calculus disease
Courvoisier’s law
Blue discoloration around the umbilicus (result of hemoperitoneum)
Cullen’s sign
Blue-red-purple or green brown discoloration of the flanks (reflects tissue catabolism of Hb)
Turner’s sign
Defined by the presence of histologic abnormalities, including chronic inflammation, fibrosis, and progressive destruction of both exocrine and eventually endocrine tissue
Chronic pancreatitis
Refers to an assessment of the severity or activity of liver disease, whether acute or chronic; active or inactive; mild, moderate, or severe
Grading
Reflects the level of progression of the disease, based on the degree of hepatic fibrosis
Staging
Indicates cirrhosis with a Child-Pugh score of >7 (Class B)
Decompensation
Used to assess prognosis in cirrhosis and provide standard criteria for listing liver transplantation (Class B)
Child-Pugh score
Used in assessing candidates for liver transplantation calculated using three noninvasive variables: INR, Serum bilirubin, Serum creatinine
MELD score
More specific indicator of liver injury
ALT
Hepatic inflammation and necrosis that continue for at least 6 months
Chronic Hepatitis
Caused by Hep B, B+D, C
Chronic viral hepatitis
Characterized by presence in the serum of HbeAg and HBV DNA levels
Replicative Phase (Hep B)
CLASSIC syndrome occurring in young women
Type I Autoimmune Hepatitis
Associated iwth Anti-LKM
Type II Autoimmune Hepatitis
Type II Autoimmune Hepatitis, Hepatitis C
Anti-LKM1
Drug-induced hepatitis
Anti-LKM2
Chronic hepatitis D
Anti-LKM3
Hemolytic anemia with spur cells and acanthocytes in patients with severe alcoholic hepatitis
Zieve’s syndrome
Elevation of hepatic venous pressure gradient to > 5 mmHg
Portal hypertension
Progressive impairment in renal function and a significant reduction in creatinine clearance within 1-2 weeks
Type 1 HRS
Laboratory features that argue AGAINST irritable bowel syndrome
evidence of anemiaelevated sedimentation ratepresence of leukocytes or blood in stoolstool volume > 200-300ml/d
Saclike herniation of the ENTIRE bowel wall
true diverticulum
Involves only a protrusion of the mucosa through the muscularis propria of the colon
Pseudodiverticulum
Air-fluid level in the LLQ on plain abdominal film
Giant diverticulum of the sigmoid colon
Staging for perforated diverticular disease
Hinchey classification system
Circumferential, full-thickness protrusion of the rectal wall through the anal orifice
Rectal prolapse (proccidentia)
Majority of patient complains include anal mass, bleeding per rectum, and poor perianal hygiene
EXTERNAL prolapse
Present with symptoms of BOTH constipation and incontinence
INTERNAL prolapse
Involuntary passage of fecal material >10 ml for at least 1 month
Fecal incontinence
Incontinence to flatus and occasional seepage of liquid stool
Minor incontinence
Frequent inability to control solid waste
Major incontinence
Goodsall’s Rule
Posterior external fistula will enter the anal canal in the posterior midlineAnterior fistula will enter the nearest cryptA fistula exiting > 3cm from the anal verge may have a complicated upward extension and may NOT obey Goodsall’s Rule
Chronic anal fissures
present for > 6 weeks
Characterized by cramping midabdominal pain, which tends to be more severe the higher the obstruction
Mechanical Intestinal Obstruction
Features of liver injury, inflammation and necrosis predominate
Hepatocellular disease
Features of bile flow inhibition predominate
Cholestatic (obstructive) disease
Alcohol seeking behavior, despite its adverse effects
Dependence
Visualizes only the rectum and a variable portion of the left colon, typically to 60 cm from the anal verge
Flexible sigmoidoscopy
Dysphagia for solid and liquid food
Suggests a motility disorder such as achalasia
Bird’s beak appearance; aganglionic cells in the esophagus
Achalasia
Dysphagia for solid food
Suggestive of stricture, ring, or tumor
Impaired LES relaxation and absent peristalsis
Esophageal manometry: Diagnostic criteria for achalasia
Olive-shaped mass, non-bilous vomiting
Pyloric stenosis
Aganglionic cells in the colon
Hirschprung disease
Perception of a lump or fullness in the throat that is felt irrespective of swallowing
Globus Hystericus
Diffuse esophageal spasm has been characterized radiographically by
Tertiary contractions or a “corkshrew esophagus”, “rosary bead esophagus’
GU that fails to heal after 12 weeks of therapyDU that does not heal after 8 weeks of therapy
Refractory peptic ulcer disease
Ulcer recurrence rates are higher, although the overall complication rates are the lowest of the three procedures
Highly-selective vagotomy
Provides the lowest rates of ulcer recurrence, but has the highest complication rate
Vagotomy with Antrectomy
Hypothetical gastinoma triangle (location of ~80% of gastrinomas)
Confluence of:cystic and CBD superiorlyjunction of the 2nd and 3rd portions of the duodenum inferiorlyJunction of the neck and body of the pancreas medially
Characterized by large, tortuous gastric mucosal folds
Menetrier’s disease
Mucosal disease that usually involves the rectum and extends proximally to involve all or part of the colon
Ulcerative colitis (UC)
Can affect any part of the GIT from the mouth to the anus
Crohn’s disease (CD)
Characteristic of CD, both endoscopically and by barium radiography
Cobblestone appearance
60-70% of UC patients; >5-15% of CD patients
pANCA positivity
60-70% of CD patients; >10-15% of UC patients
ASCA positivity