GI Flashcards
Initial actions in a patient with abdominal pain?
- Primary survey (ABCs, 2 large bore IVs with immediate fluid resuscitation if hemodynamic instability)
- Pregnancy test in women of child-bearing age (use Foley to obtain urine if unstable or send blood)
- Blood products in unstable patients with suspected hemorrhage
- Bedside imaging in patients with concern for pneumo or hemoperitoneum (XR, US)
- Order ABX in the setting of sepsis, peritonitis, or perforation
- Analgesia
- Immediate surgical consultation in the setting of hemodynamic instability or a rigid abdomen
Abdominal pain + hemodynamic instability should alert the physician to what possibilities?
Hemorrhage, sepsis, perforated viscus, or necrotic bowel
Life- or organ-threatening diagnoses that must be considered in patients with abdominal pain?
Ectopic pregnancy Appendicitis AAA PID/TOA Biliary disease Bowel obstruction Perforated viscus Mesenteric ischemia Testicular (ACS)
Cholelithiasis occurs as a result of supersaturation of bile with ___ (70%), ___ such as bilirubin (20%), or both (10%), combined with delayed emptying of the gallbladder (stasis).
Cholesterol; bilirubin
What is choledocholithiasis?
Presence of gallstones within the common bile duct
What is acute cholecystitis?
Inflammation of the gallbladder related to the presence of gallstones in 90-95% of cases; acalculous cholecystitis occurs in <10% of cases and are more common in elderly, post-operative, or critically ill patients
What is cholangitis?
Inflammation of the bile duct, most often 2/2 polymocrobial bacterial infection
Classic presentation of biliary colic?
Episodic/intermittent/colicky burning/pressure-like/heavy RUQ or epigastric pain associated with N/V, may radiate to the back, R flank, or tip of the R scapula
May be related to ingestion of a fatty meal
Most resolve within 4-6 hours
Charcot’s triad?
Classic presentation of cholangitis - RUQ pain, fever, jaundice
Physical exam findings of biliary disease?
RUQ or epigastric tenderness
Murphy’s sign (good sensitivity, low specificity for acute cholecystitis)
Jaundice if biliary tree obstructed
Elevated temperature suggests cholecystitis and cholangitis
Lab work-up in biliary disease?
WBCs AST/ALT Bilirubin (conjugated) Alkaline phosphatase Amylase/lipase
Initial diagnostic test of choice for evaluation of biliary tract disease?
US
> 95% sensitivity for identification of cholelithiasis (mobile echogenic material casting posterior shadows)
<80% sensitivity for choledocholithiasis
Sensitivity 88-94% and specificity 78-80% for acute cholecystitis (gallstones, GB wall thickening - 5mm or greater, pericholecystic fluid, and/or positive sonographic Murphy’s sign)
Dilation of common bile duct (>6 mm adults, >8 mm in elderly)
Indications for HIDA scan?
If US is equivocal or negative for cholecystitis in the presence of a high clinical suspicion (90-94% sensitive for acute cholecystitis)
Positive HIDA study?
Lack of visualization of the gallbladder within 4 hours after injection
Indications for CT scan in evaluating biliary disease?
If US results are equivocal and HIDA scan is unavailable or if a broad differential is still being considered
Indications for ERCP in suspected biliary disease?
Useful for diagnosis and treatment of biliary and pancreatic duct diseases (MRCP or endoscopic US is better for diagnostics alone)
Risk factors for biliary disease?
Female >40 y/o Family history Obesity Multiparity Rapid weight loss Sickle cell or other hemolytic disorders (pigmented stones) DM (increased risk of cholecystitis)
Rx biliary disease
Biliary colic - symptom control (NSAIDs, fluids, anti-emetics), elective cholecystectomy
Choledocholithiasis - surgical or ERCP removal of stone
Cholecystitis and cholangitis - symptoms control with fluids, anti-emetics, and analgesics + broad-spectrum parenteral ABX, prompt cholecystectomy
Incidence of appendicitis peaks around which decades?
Around the 2nd and 3rd decades
Classic presentation of appendicitis?
Vague epigastric or periumbilical pain N/V and anorexia Abdominal tenderness, migrating then localizing to the RLQ Fever Leukocytosis
Discuss the sensitivity and specificity of physical exam findings in suspected appendicitis.
RLQ pain/guarding - high sensitivity (81%), low specificity
Abdominal rigidity - high specificity (83%), low sensitivity
Psoas, obturator, and Rovsing’s signs are all relatively poor predictors
NO SINGLE EXAM FINDING SHOULD BE USED TO RULE IN OR RULE OUT THE DISEASE
Work-up for appendicitis?
CBC (leukocytosis, though 10-20% will have a normal WBC count)
CRP (elevated CRP + elevated WBC has a combined sensitivity of 98%)
BMP
UA
US
CT
MRI
When is US indicated in appendicitis work-up?
Preferred imaging in children and pregnant patients
US findings suggestive of appendicitis?
Appendix >6-7 mm in diameter, non-compressible, increased wall thickness, periappendiceal stranding, fecalith, increased vascularity on Doppler
When is CT indicated in the work-up for appendicitis?
Adult males and non-pregnant females
IV contrast is recommended, though non-contrast is acceptable
When is MRI indicated in the work-up for appendicitis?
Pregnant patients with a non-diagnostic US
Rx appendicitis?
Prompt appendectomy
NPO, IV ABX (Amp-sulbactam, cefoxitin, combo metronidazole + ciprofloxacin, etc. if uncomplicated, carbapenem with pip/tazo if complicated)
IV fluids
Pain control
Antiemetics
Appendicitis ED dispo options?
OR for appendectomy
IR for percutaneous drainage of abscess
Obs in hospital for serial exam
Return in 24 hours for repeat exam
Patients with a rupture AAA may present to the ED with a CC of what?
Common misdiagnoses?
Abdominal, back, or flank pain
Renal colic, pancreatitis, bowel ischemia, diverticulitis, cholecystitis, bowel obstruction, MI, and MSK back pain
Classic presentation of ruptured AAA?
Pain (acute, severe, constant in the abdomen, back, or flank, can radiate to the chest, thigh, inguinal region, or scrotum)
Hypotension
Pulsatile abdominal mass (at or above the level of the umbilicus)
N/V, near-syncope, syncope, AMS
Continuous abdominal bruit and a palpable abdominal thrill suggest AV fistula; bloody stools can indicate an aortoenteric fistula
Initial actions and primary survey in suspected AAA?
If known or suspected ruptured AAA, consider unstable regardless of initial vitals and Hgb.
Manage ABCs -> 2 large bore IVs, type and cross-match blood
Target BP - 90-100 mmHg
Diagnostic testing in suspected AAA?
If unstable with known or suspected ruptured AAA - transfer to OR as soon as possible
Labs - H/H, coags, BMP, UA (lipase, LFTs if undifferentiated)
Imaging - US (ideal study), CT (extremely accurate), plain films (if no US/CT)
Rx AAA?
Crystalloid, blood products
Emergent surgical repair (vascular surgery)
Dispo AAA?
Acutely symptomatic - hospital admission and surgical repair
Unstable - emergent surgery
Stable, not cause of symptoms - refer to surgeon for OP work-up
Initial actions and primary survey in suspected mesenteric ischemia?
Consider in all elderly patients with abdominal pain Large bore IV access Fluid resuscitation Telemetry monitoring EKG (AFib?) Surgical consultation early Address ABCs