LE4 Flashcards

Question

29. Which of the following does not require antibiotics for an anorectal abscess? A. Immunocompromised Patients B. Patients with Coronary Artery Disease C. Patients with Prosthetic Heart Valves D. Diabetic Patients

Answer 1

B. Patients with Coronary Artery Disease Rationale: Antibiotics are warranted for immunocompromised patients, diabetics, or those with prosthetic heart valves. Coronary artery disease alone does not require antibiotics.

Answer 2

A. Anal Fissure Rationale: Nifedipine ointment reduces anal sphincter pressure, promoting healing of chronic anal fissures.

Answer 3

C. All of the above Rationale: IBS is multifactorial, involving genetic predisposition, altered serotonin transport, and increased psychological issues like anxiety and depression, all contributing to the condition.

Answer 4

A. Esophageal Atresia Rationale: Esophageal atresia is the most common congenital anomaly of the esophagus, often associated with tracheoesophageal fistula.

Answer 5

B. Ganciclovir Rationale: The described ulcers with large nuclear and cytoplasmic inclusion bodies indicate CMV (Cytomegalovirus) esophagitis, which is common in immunosuppressed patients and treated with Ganciclovir.

Answer 6

C. Atrophic Gastritis Rationale: Atrophic gastritis leads to reduced acid production, which can decrease the severity of esophagitis by reducing acid reflux into the esophagus.

Answer 7

C. Esophageal Squamous Cell Carcinoma Rationale: H. pylori is associated with gastric cancer, duodenal ulcers, and MALT lymphoma but not with esophageal squamous cell carcinoma.

Answer 8

C. Duodenal Ulcer Rationale: Duodenal ulcer pain typically improves with food, whereas gastric ulcer pain worsens after eating. Nighttime pain is also characteristic of duodenal ulcers.

Answer 9

C. Hepatitis B Rationale: Hepatitis B is a DNA virus from the Hepadnaviridae family. Hepatitis A, C, and E are RNA viruses.

Answer 10

A. Hepatitis C co-infects and requires the helper function of Hepatitis B virus for its replication Rationale: This statement is false because Hepatitis D (HDV), not Hepatitis C, requires Hepatitis B for its replication. Hepatitis C is an independent RNA virus.

Answer 11

D. Diarrhea Rationale: Post-surgical diarrhea can occur due to dumping syndrome, especially in patients who have undergone gastric or bowel surgeries, as rapid gastric emptying affects the digestive process.

Answer 12

A. Urea Breath Test Rationale: The urea breath test is a non-invasive and accurate initial screening for H. pylori infection. Biopsy, though definitive, is more invasive and not a screening test.

Answer 13

A. Atrophic Gastritis Rationale: Loss of rugal folds is characteristic of atrophic gastritis, where chronic inflammation leads to thinning of the gastric mucosa and loss of normal gastric architecture.

Answer 14

C. HIV Infection Rationale: HIV infection itself is not a direct risk factor for alcoholic liver disease. Risk factors include gender (males), fatty liver, and HCV infection, which can exacerbate liver damage.

Answer 15

B. Intestinal-derived endotoxin initiates a pathogenic process through toll-like receptor 4 and tumor necrosis factor Rationale: Alcohol increases intestinal permeability, leading to endotoxins entering the portal circulation. These activate toll-like receptor 4 (TLR4) on Kupffer cells, producing tumor necrosis factor (TNF-α), which drives inflammation and liver injury.

Answer 16

A. Hepatocellular Carcinoma Rationale: Cirrhosis is the strongest risk factor for developing hepatocellular carcinoma (HCC), regardless of whether the patient continues alcohol consumption or not.

Answer 17

B. Ganciclovir Rationale: The described inclusion bodies are characteristic of CMV esophagitis, which is common in immunocompromised patients. Ganciclovir is the first-line treatment.

Answer 18

C. Atrophic Gastritis Rationale: Atrophic gastritis causes hypoacidity, which reduces acid reflux and thereby lessens the severity of esophagitis.

Answer 19

D. Splenic Vein and Superior Mesenteric Vein Rationale: The portal vein is formed by the confluence of the splenic vein and the superior mesenteric vein, which drain blood from the intestines, spleen, pancreas, and stomach.

Answer 20

D. > 5 mmHg Rationale: Portal hypertension is diagnosed when the hepatic venous pressure gradient exceeds 5 mmHg, with clinical significance often appearing at higher levels.

Answer 21

D. Endoscopic Retrograde Cholangiopancreatography (ERCP) Rationale: ERCP is the gold standard for managing biliary obstruction caused by common bile duct pathology, such as strictures, stones, or tumors.

Answer 22

A. Cholecystectomy Rationale: Cholecystectomy (surgical removal of the gallbladder) is the definitive management for symptomatic cholecystitis caused by gallstones, particularly when there is right upper quadrant pain and ultrasound findings of gallbladder distention.

Answer 23

D. None of the above Rationale: Prophylactic cholecystectomy is warranted for certain conditions such as recurrent pancreatitis, calcified (porcelain) gallbladder, and prior cholecystitis. If the patient has none of these, reassurance is preferred.

Answer 24

B. Reassurance Rationale: Asymptomatic gallstones do not require intervention. Patients should be reassured and observed unless they develop symptoms like biliary colic or complications.

Answer 25

C. Black pigment stones Rationale: Black pigment stones are commonly seen in conditions involving chronic hemolysis or cirrhosis due to excess unconjugated bilirubin.

Answer 26

B. Aggressive fluid administration Rationale: Early and aggressive fluid resuscitation is critical to prevent worsening organ dysfunction in acute pancreatitis.

Answer 27

C. Amylase and lipase >3× the upper limit of normal Rationale: Elevated amylase and lipase are the most indicative laboratory findings in acute pancreatitis. Lipase is more specific.

Answer 28

C. Vital signs, physical examination, urine output Rationale: Clinical monitoring with vital signs, physical examination, and urine output is essential for assessing the patient’s improvement and fluid status.

Answer 29

A. Serum lipase Rationale: While lipase levels are most useful for diagnosis, monitoring trends can sometimes help, though clinical improvement remains the primary marker.

Answer 30

D. Perform ERCP Rationale: If the etiology is suspected to be gallstones, ERCP can relieve biliary obstruction and improve the clinical course.

Answer 31

C. Pancreatic pseudocyst Rationale: A pancreatic pseudocyst is a well-defined, encapsulated fluid collection that forms as a complication of acute pancreatitis. It is surrounded by a fibrous or granulation tissue wall and lacks an epithelial lining.

Answer 32

B. Elevated serum lipase or amylase Rationale: Acute pancreatitis is characterized by a 3-fold increase in serum lipase or amylase levels, which occur within hours of the onset of pain and are the primary diagnostic markers.

Answer 33

C. Black pigment stones Rationale: Black pigment stones are common in patients with chronic liver disease or hemolytic conditions, due to increased unconjugated bilirubin in bile.

Answer 34

B. Aggressive fluid administration Rationale: Early and aggressive fluid resuscitation is essential in acute pancreatitis to prevent complications like hypovolemic shock and organ failure.

Answer 35

C. AOTA (All of the above) Rationale: Vertical transmission of HCV is more likely with HIV co-infection, prolonged/difficult labor, and high maternal viral load. Early rupture of membranes and invasive monitoring also increase the risk.

Answer 36

D. Hepatitis E virus (HEV) Rationale: Hepatitis E virus (HEV) is known for causing autochthonous infections, particularly in developing regions with poor water sanitation, and in some developed countries due to zoonotic transmission (e.g., undercooked pork).

Answer 37

B. Fluid correction Rationale: In cases of suspected bowel obstruction or ileus, fluid resuscitation is the initial priority to manage dehydration and electrolyte imbalances caused by vomiting and reduced intake.

Answer 38

D. Electrolyte disturbances from vomiting Rationale: * The patient's history of vomiting and absence of abdominal pain, fever, or tenderness makes electrolyte imbalance from vomiting a significant concern. * Previous abdominal surgery (appendectomy) may predispose the patient to adhesions, which can cause obstruction or ileus. This can result in fluid accumulation and bacterial overgrowth, as seen in the diagram. * Although obstruction is a possibility, the patient's stable vitals and lack of tenderness make electrolyte disturbances a likely contributor.

Answer 39

D. Increased mechanical pressure exceeding arterial pressure Rationale: In strangulation, increased intraluminal pressure impairs venous return and eventually exceeds arterial pressure, leading to ischemia, necrosis, and perforation.

Answer 40

C. Pyloric Rationale: Non-bilious vomiting indicates an obstruction proximal to the ampulla of Vater (e.g., pylorus), where bile is not yet mixed with gastric contents.

Answer 41

D. AST/ALT Rationale: The Child-Pugh score assesses liver function using bilirubin, albumin, INR, ascites, and encephalopathy, but AST/ALT levels are not part of the scoring system.

Answer 42

C. Age Rationale: Age is the most significant risk factor for cancer, as genetic mutations accumulate over time, increasing cancer risk with advancing age.

Answer 43

A. Upper and middle esophagus Rationale: Squamous cell carcinoma of the esophagus is most commonly located in the upper and middle thirds, while adenocarcinoma occurs near the gastroesophageal junction (GEJ).

Answer 44

A. Esophageal adenocarcinoma Rationale: Barrett's esophagus, a complication of chronic GERD, predisposes to esophageal adenocarcinoma due to metaplastic changes in the esophageal lining.

Answer 45

B. Every 3 years Rationale: After removal of precancerous polyps, a repeat colonoscopy every 3 years is recommended to monitor for recurrence or new polyps.

Answer 46

A. Bleeding Rationale: Tumors of the ascending colon often cause fatigue, palpitations, and angina due to chronic blood loss leading to iron-deficiency anemia. Acute bleeding is rare in ascending colon tumors.

Answer 47

B. Sessile Rationale: Villous adenomas are typically sessile (flat-based) and are 3 times more likely to become malignant compared to tubular adenomas.

Answer 48

B. Sister Mary Joseph Node Rationale: A Sister Mary Joseph Node is a palpable nodule in the periumbilical region due to metastatic spread of abdominal or pelvic malignancies, commonly gastric cancer.

Answer 49

C. Prophylactic antibiotics are not recommended even for prevention of infective endocarditis Rationale: According to Table 315-1, for "all cardiac conditions" undergoing any endoscopic procedure, prophylactic antibiotics are not indicated for prevention of infective endocarditis. This recommendation aligns with guidelines that antibiotics are not routinely given unless specific high-risk conditions apply.

Answer 50

D. Provide antibiotic prophylaxis pre- and post-procedure to prevent cholangitis Rationale: Table 315-1 specifies that for ERCP with anticipated incomplete drainage (e.g., sclerosing cholangitis, hilar strictures), prophylactic antibiotics are recommended, with a note to continue antibiotics after the procedure. This approach reduces the risk of cholangitis, which is a common complication in these scenarios.

Answer 51

A. Prophylaxis antibiotic is not recommended Rationale: As per Table 315-1, prophylactic antibiotics for prosthetic joints during any endoscopic procedure are not recommended. Guidelines suggest that there is no significant evidence supporting routine antibiotic prophylaxis for joint infections during these procedures.

Answer 52

D. All of the above Rationale: From Table 315-2, the management of rivaroxaban (a novel oral anticoagulant) is outlined as follows: 1. Option A: "Rivaroxaban may be continued or hold the morning dose on the day of the procedure" * For low-bleeding risk procedures, rivaroxaban may be continued or the morning dose held. * However, this case involves EGD and colonoscopy, which can include biopsies, categorizing it as high bleeding risk. For high-risk procedures, rivaroxaban should be discontinued 2-4 days prior to the procedure depending on renal function. 2. Option B: "Novel oral anticoagulants such as Dabigatran, Rivaroxaban, Apixaban, and Edoxaban" * These drugs are explicitly listed in Table 315-2. Their discontinuation and resumption depend on bleeding risk and renal function. 3. Option C: "Have low risk of bleeding during the procedure" * While low-bleeding risk procedures allow continuation, colonoscopy/EGD with biopsies are not inherently low-risk. However, if no intervention is planned, the bleeding risk might remain low.

Answer 53

A. Continue warfarin; the procedure has a low risk of bleeding Rationale: Table 315-2 states that for low-risk procedures, warfarin can be continued if the INR is therapeutic (e.g., INR ≤ 3). Upper GI endoscopy without interventions (or minimal biopsy) is generally considered a low-risk procedure. Hence, continuing warfarin is acceptable. Discontinuing warfarin would only be required for procedures with high bleeding risk, which does not apply here.

Answer 54

D. Splenic vein and superior mesenteric vein Rationale: The portal vein is the largest vessel in the portal venous system, and it is formed by the union of the splenic vein and the superior mesenteric vein. This is clearly highlighted in the provided notes.

Answer 55

A. Acute Hepatitis A Rationale: Positive IgM anti-HAV is specific for Acute Hepatitis A infection, indicating a recent or active infection. IgM antibodies appear early during the course of infection.

Answer 56

A. Acute Hepatitis B with high infectivity Rationale: The presence of anti-HBc IgM indicates an acute phase of Hepatitis B. * HBAg indicates an active infection. * HBeAg suggests high viral replication and high infectivity.

Answer 57

A. Immunization Rationale: Positive anti-HBs (hepatitis B surface antibody) indicates immunity to Hepatitis B. This can result from vaccination or recovery from a resolved infection. In the absence of other markers like HBsAg or anti-HBc, it is most consistent with immunization.

Answer 58

D. Budd-Chiari Syndrome Rationale: Budd-Chiari syndrome is classified as a post-hepatic cause of portal hypertension due to hepatic venous outflow obstruction. The other options (Schistosomiasis, Veno-Occlusive Syndrome, and Alcoholic Hepatitis) are hepatic causes of portal hypertension.

Answer 59

A. Acute Suppurative Cholangitis Rationale: The triad of symptoms—fever, jaundice, and right upper quadrant pain—is characteristic of Charcot’s triad seen in acute cholangitis. In severe cases, hypotension and altered mental status indicate Reynold’s pentad, consistent

Answer 60

B. Hepatitis B Rationale: Hepatitis B is a DNA virus from the Hepadnaviridae family. Hepatitis A, Hepatitis C, and Hepatitis E are RNA viruses. SARS-CoV-2 is also an RNA virus.

Answer 61

A. HBsAg Rationale: HBsAg (Hepatitis B surface antigen) is the first serologic marker to appear in the blood during acute Hepatitis B infection, usually within 8–12 weeks of exposure.

Answer 62

B. N-acetylcysteine Rationale: N-acetylcysteine (NAC) acts as a precursor to glutathione, which detoxifies the toxic metabolite NAPQI produced by acetaminophen overdose. NAC is the standard treatment for acetaminophen toxicity.

Answer 63

A. NAPQI Rationale: NAPQI (N-acetyl-p-benzoquinone imine) is the toxic metabolite of acetaminophen. When glutathione stores are depleted, NAPQI binds to hepatocyte proteins, leading to liver injury.

Answer 64

D. Anti-HBs Rationale: Anti-HBs (Hepatitis B surface antibody) is the protective antibody that provides immunity against Hepatitis B. It appears after recovery from infection or immunization. The presence of anti-HBs indicates protection against reinfection.

Answer 65

A. HBsAg Rationale: The first marker to appear in the serum during acute Hepatitis B infection is HBsAg (Hepatitis B surface antigen), typically detectable within 8–12 weeks. It indicates an active infection and precedes clinical symptoms and liver enzyme elevations.

Answer 66

A. Paracetamol Rationale: N-acetylcysteine is the antidote for paracetamol (acetaminophen) overdose. It replenishes glutathione levels, detoxifies the harmful metabolite NAPQI, and reduces hepatic necrosis if administered within 8 hours of ingestion.

Answer 67

B. Ascending Cholangitis Rationale: The classic triad of biliary pain, jaundice, and fever is known as Charcot's triad, which is diagnostic of ascending cholangitis. It is caused by infection of the bile ducts, often due to obstruction (e.g., gallstones).

Answer 68

B. ERCP Rationale: ERCP (Endoscopic Retrograde Cholangiopancreatography) is a procedure that diagnoses and treats conditions of the liver, gallbladder, bile ducts, and pancreas. It combines endoscopy and fluoroscopy to visualize and intervene in these areas.

Answer 69

A. Protein-Losing Enteropathy Rationale: Protein-losing enteropathy (PLE) occurs when albumin and other protein-rich materials leak into the intestine, leading to hypoalbuminemia and peripheral edema without liver or kidney involvement.

Answer 70

D. Splenic and Superior Mesenteric Vein Rationale: The portal vein is formed behind the neck of the pancreas by the union of the splenic vein and the superior mesenteric vein. It is a key vessel in the portal circulation system.

Answer 71

B. Duration and Quantity of Alcohol Intake Rationale: The most critical determinants of alcoholic liver disease (ALD) are the duration and quantity of alcohol consumed. The type of alcohol or gender is less significant compared to the total cumulative intake.

Answer 72

B. Left-Sided Heart Failure Rationale: While hepatitis may mimic several conditions like acute cholecystitis and alcoholic hepatitis, left-sided heart failure is not typically considered a differential diagnosis. Right-sided heart failure, however, can cause hepatic congestion.

Answer 73

C. Basal acid production levels occur in a circadian pattern, with lowest levels in the morning and highest levels at night Rationale: Gastric acid secretion follows a circadian rhythm, with the lowest levels in the morning and highest levels during the night. This circadian pattern is influenced by neural and hormonal factors.

Answer 74

C. Hyperalbuminemia Rationale: Chronic liver disease, including alcoholic liver disease, often leads to hypoalbuminemia due to reduced hepatic synthetic function. * Hyperbilirubinemia occurs due to impaired bilirubin excretion. * Elevated liver enzymes (AST/ALT, GGT) reflect liver injury. * Hyperalbuminemia is not expected in liver disease.

Answer 75

A. Aggressive fluid administration Rationale: In acute pancreatitis, aggressive fluid resuscitation is the most critical initial intervention to prevent hypovolemia, organ failure, and shock. Lactated Ringer’s solution or normal saline is used.

Answer 76

B. Black pigment stones Rationale: Black pigment stones are associated with chronic liver disease, hemolysis, and cirrhosis. They are formed from calcium bilirubinate due to impaired bilirubin metabolism.

Answer 77

A. Hepatocellular carcinoma Rationale: Cirrhosis, regardless of alcohol cessation, significantly increases the risk for hepatocellular carcinoma (HCC). Regular surveillance is necessary to detect HCC early.

Answer 78

A. Urea breath test Rationale: The urea breath test is the preferred non-invasive test for detecting active H. pylori infection. It is simple, quick, and accurate. Biopsy is more invasive and reserved for endoscopic evaluation.

Answer 79

C. Diarrhea Rationale: Post-surgical complications, such as postvagotomy diarrhea, are common following procedures like truncal vagotomy. It occurs due to motility issues and loss of vagal input to the gut.

Answer 80

A. Decreased gastric mucosal blood flow Rationale: NSAIDs inhibit COX enzymes, reducing prostaglandin production. Prostaglandins play a key role in maintaining gastric mucosal blood flow and protecting the gastric lining. Decreased blood flow leads to mucosal injury and ulcers.

Answer 81

A. Odynophagia Rationale: Odynophagia (painful swallowing) is uncommon in GERD but is characteristic of infectious esophagitis (e.g., candida, herpes). Dysphagia, chest pain, and regurgitation are more typical of reflux esophagitis.

Answer 82

A. Adhesions Rationale: Postoperative adhesions are the most common cause of small bowel obstruction (SBO), especially after abdominal surgeries like appendectomy. The symptoms of abdominal pain, distention, constipation, and increased bowel sounds support this diagnosis.

Answer 83

D. Scout Film of the Abdomen Rationale: An abdominal scout film (plain upright X-ray) is the initial diagnostic test for suspected bowel obstruction. It can quickly identify signs such as: * Dilated bowel loops (>2.5 cm in small bowel obstruction). * Air-fluid levels. * Absence of gas distal to the obstruction. This test is quick, inexpensive, and non-invasive, making

Answer 84

B. Fluid Correction Rationale: In cases of intestinal obstruction, the immediate priority is: 1. Fluid resuscitation to correct dehydration, electrolyte imbalance, and maintain hemodynamic stability. 2. Rest the bowel by keeping the patient NPO (nothing per mouth). 3. Nasogastric decompression if needed. Antibiotics and PPls are not the first interventions in this context, and feeding the patient would worsen the obstruction.

Answer 85

D. Electrolyte disturbances from vomiting Rationale: Frequent vomiting can lead to electrolyte imbalances, particularly hypokalemia and hypochloremia. These disturbances impair intestinal motility, resulting in abdominal distention and decreased bowel sounds. The absence of pain and tenderness further supports this etiology.

Answer 86

D. Increased mechanical pressure exceeding arterial pressure Rationale: In bowel strangulation, the intraluminal pressure increases beyond arterial pressure, compromising blood flow. This leads to ischemia, necrosis, and subsequent perforation of the bowel.

Answer 87

A. CT angiography Rationale: CT angiography is the gold standard for diagnosing mesenteric ischemia. It allows for visualization of mesenteric vessels, identification of arterial occlusion, and assessment of bowel viability. Laparotomy is typically reserved for unstable patients or as a therapeutic intervention.

Answer 88

C. Pneumatosis intestinalis Rationale: Pneumatosis intestinalis refers to the presence of gas within the bowel wall. It is seen in conditions like mesenteric ischemia and necrotizing enterocolitis and indicates bowel ischemia or perforation.

Answer 89

A. Disruption of mucosal integrity leading to gas-forming bacteria intramurally Rationale: In mesenteric ischemia, mucosal integrity is compromised, allowing gas-forming bacteria to invade and produce gas within the bowel wall. This results in the characteristic finding of pneumatosis intestinalis.

Answer 90

A. Non-occlusive ischemia Rationale: Non-occlusive mesenteric ischemia (NOMI) occurs in states of low-flow, such as cardiogenic shock, septic shock, or vasospasm (e.g., from cocaine use). There is no physical obstruction, but mesenteric perfusion is reduced, leading to ischemia.

Answer 91

A. Virus replication occurs in the liver, bone marrow... Rationale: Hepatitis A virus replication is limited to the liver. The virus is present in the liver, bile, stool, and blood during the late incubation period. It does not replicate in the bone marrow.

Answer 92

C. Hepatitis B Rationale: Hepatitis B virus (HBV) is the only DNA virus among the hepatitis viruses. It belongs to the Hepadnavirus family. Hepatitis A, C, and E are all RNA viruses.

Answer 93

A. It coinfects and requires the function of Hepatitis B virus for its replication Rationale: Hepatitis C virus is an independent RNA virus and does not require HBV for replication. This statement applies to Hepatitis D virus, which needs HBV to replicate.

Answer 94

D. It coinfects and requires the helper function of Hepatitis B virus for its replication Rationale: * Hepatitis C virus (HCV) is an independent RNA virus. It does not need the Hepatitis B virus (HBV) for its replication. * Hepatitis D virus (HDV) is the defective virus that requires HBV for replication and expression, as it lacks the necessary proteins to complete its life cycle. The other options about HCV are correct: * HCV RNA can be detected early in infection (Option A). * It is classified as an RNA virus (Option B). * PCR amplification is the most sensitive method for detecting HCV RNA (Option C).

Answer 95

B. Disrupted sodium homeostasis Rationale: The correct mechanism involves disruption of calcium homeostasis, not sodium. Drug-induced liver injury affects intracellular calcium levels, mitochondrial function, and induces apoptosis.

Answer 96

C. Rovsing’s Sign Rationale: Rovsing’s sign occurs when pressure applied to the left lower quadrant elicits pain in the right lower quadrant. It is a classic sign of appendicitis.

Answer 97

A. Abdominal CT Scan Rationale: CT scan of the abdomen is the most reliable imaging modality for diagnosing appendicitis. It provides detailed visualization of the appendix and surrounding structures, helping confirm inflammation or complications like abscesses or perforation.

LE4 Flashcards

(121 cards)