Liver, Labs, Love
This three-part structure at the edge of a hepatic lobule contains a branch of the portal vein, a branch of the hepatic artery, and a bile duct.
Correct response: What is the portal triad?
Explanation: The portal triad contains a portal venule, hepatic arteriole, and bile duct/canaliculus. Blood from the portal vein and hepatic artery flows through the sinusoids toward the central vein, while bile flows in the opposite direction toward the bile ducts.
Contaminated food, poor sanitation, and person-to-person spread point toward this hepatitis virus and its classic route of transmission.
Correct response: What is hepatitis A via the fecal-oral route?
Explanation: HAV is primarily spread fecal-orally, including through contaminated food and close personal contact. The course is generally acute and self-limited, and infection provides lifelong immunity rather than progressing to chronic hepatitis.
This chronic liver disease is characterized histologically by fibrosis and regenerative nodules.
Correct response: What is cirrhosis?
Explanation: The lecture defines cirrhosis as a chronic, irreversible liver disease involving fibrosis and regenerative nodule formation. Chronic injury and inflammation lead to scarring that progressively distorts normal hepatic architecture.
On gallbladder ultrasound, an anterior gallbladder wall thicker than this measurement is considered abnormal.
Correct response: What is 3 mm?
Explanation: A normal gallbladder wall should measure less than 3 mm. Wall thickening beyond 3 mm is one of the sonographic findings that supports acute cholecystitis, particularly when combined with the appropriate clinical picture.
This procedure is listed as the most commonly performed bariatric operation currently.
What is laparoscopic sleeve gastrectomy?
Explanation: The bariatric lecture identifies Roux-en-Y gastric bypass as the historical “gold standard,” but states that laparoscopic sleeve gastrectomy is currently the most common operation.
Between AST and ALT, this enzyme is more specific for liver injury.
Correct response: What is ALT?
Explanation: ALT is found predominantly in the liver, whereas AST is also present in cardiac muscle, skeletal muscle, kidney, and brain. Therefore, an ALT elevation is more specific for hepatocellular injury. One important exception to remember is that chronic alcohol abuse can produce AST greater than ALT.
Approximately 90% of patients infected with hepatitis B at this stage of life will develop chronic infection.
Who are infected neonates?
Explanation: Age at HBV infection dramatically affects the likelihood of chronic disease. According to the course handout, about 90% of infected neonates, 25–30% of children under 5, and only about 10% of older children and adults develop chronic infection.
The development of ascites, jaundice, variceal hemorrhage, or hepatic encephalopathy signals that cirrhosis has transitioned into this stage.
Correct response: What is decompensated cirrhosis?
Explanation: A patient can remain compensated for a substantial period despite cirrhosis. The appearance of jaundice, ascites, variceal bleeding, or encephalopathy marks decompensation and substantially worsens prognosis.
A bright echogenic focus in the gallbladder followed by this ultrasound artifact strongly supports a gallstone.
Correct response: What is acoustic shadowing?
Explanation: Gallstones appear echogenic and characteristically produce posterior acoustic shadowing because the sound beam cannot effectively pass through the dense stone. The lecture also uses the SIN sign — Stone In Neck — for an obstructing gallstone in the gallbladder neck.
Pain beginning in the epigastric or periumbilical region and later localizing to the right lower quadrant is the classic progression of this surgical condition.
Correct response: What is acute appendicitis?
Explanation: Early appendiceal distension irritates the visceral peritoneum, producing poorly localized periumbilical or epigastric pain. As inflammation reaches the parietal peritoneum, pain becomes localized to the RLQ, often with McBurney point tenderness and potentially Rovsing, psoas, or obturator signs.
This hepatic acinus zone receives the least oxygenated blood and is therefore the most susceptible to ischemic injury.
Correct response: What is Zone 3?
Explanation: Zone 1 is periportal and receives blood first, so it has the highest oxygen concentration. Zone 3 is closest to the central vein and is the last zone reached by sinusoidal blood, making it relatively oxygen-poor and the most vulnerable to ischemia.
A healthy 56-year-old unvaccinated daycare worker was exposed to hepatitis A one week ago. According to your pharmacology lecture, these two interventions should be given for post-exposure prophylaxis.
Correct response: What are the HAV vaccine plus immune globulin?
Explanation: The lecture allows HAV vaccine alone for healthy patients ages 1–40. Patients older than 40, younger than 1, immunocompromised, or with chronic liver disease receive immune globulin in addition to vaccination. The post-exposure window given in the lecture is within 2 weeks.
Portal hypertension enlarges this organ, which then sequesters platelets and contributes to thrombocytopenia.
Correct response: What is the spleen?
Explanation: Resistance to portal blood flow causes portal hypertension, leading to splenomegaly. The enlarged spleen sequesters platelets, causing thrombocytopenia, which adds to the bleeding risk already produced by impaired hepatic clotting-factor synthesis.
RUQ pain plus gallstones, a positive sonographic Murphy sign, pericholecystic fluid, and gallbladder wall thickening greater than 3 mm most strongly suggests this diagnosis.
Correct response: What is acute cholecystitis?
Explanation: The ultrasound lecture lists stones or sludge, sonographic Murphy sign, pericholecystic fluid, wall thickening >3 mm, CBD dilation, and gallbladder enlargement as supportive findings. No single ultrasound finding has to stand alone; the pattern plus the patient's symptoms strengthens the diagnosis.
Adhesions, hernias, and masses are the major causes of this condition. In a stable patient, initial treatment includes NPO status, IV fluids, and NG-tube decompression.
Correct response: What is small bowel obstruction?
Explanation: The surgical lecture lists adhesions first, followed by hernias and masses, as the major causes of bowel obstruction. Stable patients are initially treated nonoperatively with NPO, IV fluids, and NG decompression for 24–72 hours; a small bowel follow-through may be both diagnostic and therapeutic. An unstable patient requires urgent surgery.
A patient has jaundice, dark urine, pale or clay-colored stools, increased urine bilirubin, and no urine urobilinogen. This general type of problem is most likely.
Correct response: What is posthepatic biliary obstruction?
Explanation: In biliary obstruction, bilirubin has already been conjugated, but it cannot reach the intestine. Conjugated bilirubin therefore spills into the blood and urine. Because bilirubin never reaches the colon, urobilinogen is absent from the urine and stool loses its normal brown pigment, becoming pale or clay-colored.
In hepatitis C treatment, this term means HCV RNA remains undetectable at least 12 weeks after the patient finishes treatment.
Correct response: What is sustained virologic response, or SVR?
Explanation: ETR means HCV RNA is undetectable at the end of treatment. SVR is more important because HCV RNA remains absent at least 12 weeks after treatment has been completed, representing successful virologic cure in the lecture.
The standard diuretic combination for cirrhotic ascites in your lecture uses these two drugs in a 100:40 mg ratio.
Correct response: What are spironolactone 100 mg and furosemide 40 mg?
Explanation: Ascites management includes sodium restriction and the combination of spironolactone and furosemide in a 100:40 ratio. Therapeutic paracentesis can be used when needed, while refractory portal-hypertensive ascites may ultimately require TIPS.
A patient has RUQ abdominal pain, fever, and jaundice with elevated liver tests. This biliary emergency should make you think of Charcot's triad and often requires ERCP.
Correct response: What is ascending cholangitis from choledocholithiasis?
Explanation: The surgical abdomen lecture associates colicky RUQ pain, systemic illness/fever, jaundice or scleral icterus, elevated LFTs, and Charcot's triad with choledocholithiasis/ascending cholangitis. Management includes admission, antibiotics, GI and surgical consultation, with ERCP used to address the obstructed biliary system.
An older patient with cardiovascular disease has sudden excruciating diffuse abdominal pain but surprisingly little abdominal tenderness. CTA of the abdomen and pelvis is the key imaging test.
Correct response: What is acute mesenteric ischemia?
Explanation: A classic clue is “pain out of proportion” to the abdominal examination. Causes include arterial emboli, especially with atrial fibrillation, arterial thrombosis, vasospasm, global hypoperfusion, and venous occlusion. CT angiography evaluates mesenteric perfusion; this is a vascular emergency because ischemic bowel can progress to necrosis, gangrene, and perforation
In hepatic drug metabolism, this phase commonly uses CYP450 enzymes to create a reactive intermediate, while the next phase attaches molecules such as glucuronic acid or glutathione to promote excretion.
Correct response: What are Phase I and Phase II reactions?
Explanation: Phase I reactions use enzymes such as cytochrome P450 and commonly involve oxidation/reduction, creating a reactive “handle” on the drug. These reactions can actually create more toxic intermediates. Phase II reactions conjugate the substance with a water-soluble carrier such as glucuronic acid or glutathione, helping make it easier to excrete
During chronic hepatitis B therapy, a patient's HBV DNA initially falls but then rises by more than 1 log above its lowest achieved level while the patient remains on treatment. This resistance term describes the finding.
Correct response: What is virologic breakthrough?
Explanation: The hepatitis pharmacology material defines virologic breakthrough as an increase in HBV DNA of more than 1 log above the nadir after an initial virologic response while treatment continues. This is different from viral rebound, in which HBV DNA rises to more than 20,000 IU/mL or above the pretreatment level.
Bilirubin, INR, creatinine, and sodium are the four laboratory variables used in this scoring system to estimate short-term survival in end-stage liver disease.
Correct response: What is the MELD score?
Explanation: MELD uses bilirubin, INR, creatinine, and sodium to predict approximately 3-month survival and is important in transplant assessment. Do not confuse it with Child-Pugh, which uses bilirubin, INR, albumin, ascites, and encephalopathy to estimate longer-term prognosis and classify patients as A, B, or C.
A patient with gallstone disease develops RUQ/epigastric pain that radiates through to the back, nausea, and an elevated lipase. This complication is treated initially with supportive care rather than antibiotics.
Correct response: What is gallstone pancreatitis?
Explanation: The lecture describes RUQ or epigastric pain radiating to the back and an elevated lipase as classic for gallstone pancreatitis. Initial treatment is NPO, IV fluids, and pain control, with diet advanced as symptoms and labs improve. Cholecystectomy is eventually recommended to prevent recurrence, preferably before discharge.
A patient with a prior Roux-en-Y gastric bypass develops intermittent epigastric or periumbilical pain that may improve when leaning over a chair. CT may fail to clearly identify the cause, but the condition can become an emergency.
Correct response: What is an internal hernia after Roux-en-Y gastric bypass?
Explanation: The bariatric lecture emphasizes that an internal hernia is an important late cause of abdominal pain after RYGB and may be difficult to detect on CT. It may cause intermittent epigastric or periumbilical pain and can become a surgical emergency. This differs from dumping syndrome, which typically occurs 30–60 minutes after eating simple carbohydrates and causes symptoms such as cramping, sweating, palpitations, diarrhea, and profound fatigue.