Abdominal emergencies US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Abdominal emergencies. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Abdominal emergencies US Medical PG Question 1: A 68-year-old woman is brought to the emergency department with intense abdominal pain for the past 2 hours. She has had 1 episode of bloody diarrhea recently. She has an 18-year history of diabetes mellitus. She was diagnosed with hypertension and ischemic heart disease 6 years ago. She is fully alert and oriented. Her temperature is 37.5°C (99.5°F), blood pressure is 145/90 mm Hg, pulse is 78/min, and respirations are 14/min. Abdominal examination shows mild generalized abdominal tenderness without guarding or rebound tenderness. An abdominal plain X-ray shows no abnormalities. Abdominal CT reveals colonic wall thickening and pericolonic fat stranding in the splenic curvature. Bowel rest, intravenous hydration, and IV antibiotics are initiated. Which of the following is the most important diagnostic evaluation at this time?
- A. Angiography
- B. Gastrografin-enhanced X-ray
- C. Laparotomy
- D. Inpatient observation
- E. Sigmoidoscopy (Correct Answer)
Abdominal emergencies Explanation: ***Sigmoidoscopy***
- The patient's presentation with acute abdominal pain, bloody diarrhea, history of cardiovascular disease, and CT findings consistent with **colonic wall thickening** and **pericolonic fat stranding** strongly suggests **ischemic colitis**.
- **Flexible sigmoidoscopy** allows for direct visualization of the colonic mucosa to confirm the diagnosis, assess the extent and severity of ischemia, and rule out other causes of colitis, such as inflammatory bowel disease or infection.
*Angiography*
- While angiography can identify mesenteric arterial occlusion, it is generally reserved for cases of acute mesenteric ischemia involving the superior mesenteric artery, which typically presents with more severe pain out of proportion to physical exam findings and less clear CT findings of colitis.
- In cases of ischemic colitis, where the primary concern is mucosal ischemia rather than immediate large vessel occlusion, angiography is usually not the first-line diagnostic.
*Gastrografin-enhanced X-ray*
- This study (also known as a **Gastrografin swallow or enema**) is primarily used to evaluate for **perforations** or **obstructions**, or to assess lumen integrity.
- It does not provide the mucosal detail necessary to diagnose or assess the severity of **ischemic colitis**, and the contrast agent itself could potentially exacerbate an inflamed bowel.
*Laparotomy*
- **Laparotomy** (surgical exploration) is an invasive procedure reserved for cases with signs of peritonitis, bowel perforation, or severe, unresponsive ischemia requiring surgical intervention.
- Given the patient's stable vital signs, mild tenderness, and lack of guarding or rebound, immediate surgical exploration is not warranted without further diagnostic steps.
*Inpatient observation*
- While inpatient observation is part of the initial management (bowel rest, IV fluids, antibiotics), it is not a **diagnostic evaluation** itself.
- The question asks for the most important diagnostic evaluation to determine the underlying cause and guide further management.
Abdominal emergencies US Medical PG Question 2: A 75-year-old man presents to the emergency department for abdominal pain. The patient states the pain started this morning and has been worsening steadily. He decided to come to the emergency department when he began vomiting. The patient has a past medical history of obesity, diabetes, alcohol abuse, and hypertension. His current medications include captopril, insulin, metformin, sodium docusate, and ibuprofen. His temperature is 104.0°F (40°C), blood pressure is 160/97 mmHg, pulse is 90/min, respirations are 15/min, and oxygen saturation is 98% on room air. Abdominal exam reveals left lower quadrant tenderness. Cardiac exam reveals a crescendo systolic murmur heard best by the right upper sternal border. Lab values are ordered and return as below.
Hemoglobin: 15 g/dL
Hematocrit: 42%
Leukocyte count: 19,500 cells/mm^3 with normal differential
Platelet count: 226,000/mm^3
Serum:
Na+: 139 mEq/L
Cl-: 101 mEq/L
K+: 4.4 mEq/L
HCO3-: 24 mEq/L
BUN: 22 mg/dL
Glucose: 144 mg/dL
Creatinine: 1.2 mg/dL
Ca2+: 9.8 mg/dL
Which of the following is the most accurate test for this patient's condition?
- A. Colonoscopy
- B. Sigmoidoscopy
- C. Amylase and lipase levels
- D. Barium enema
- E. CT scan (Correct Answer)
Abdominal emergencies Explanation: ***CT scan***
- The patient presents with classic symptoms of **diverticulitis**, including **left lower quadrant pain**, **fever**, and **leukocytosis**. A **CT scan with oral and IV contrast** is the most accurate diagnostic test to identify diverticular inflammation, abscess formation, or perforation.
- A CT scan can also help rule out other causes of abdominal pain and guide further management, such as the need for percutaneous drainage of an abscess.
*Colonoscopy*
- **Colonoscopy is contraindicated during an acute episode of diverticulitis** due to the risk of **perforation** of an inflamed colon.
- It may be considered **6-8 weeks after resolution of acute diverticulitis** to investigate for other pathologies such as malignancy.
*Sigmoidoscopy*
- Similar to colonoscopy, **sigmoidoscopy is generally avoided in acute diverticulitis** because of the risk of **perforation** of the inflamed bowel from instrumentation.
- Its diagnostic yield in acute settings is also limited compared to CT imaging.
*Amylase and lipase levels*
- These tests are primarily used to diagnose **pancreatitis**, which typically presents with **epigastric pain radiating to the back**, often associated with elevated enzyme levels.
- While vomiting is present, the **left lower quadrant tenderness and fever** point away from pancreatitis as the primary diagnosis.
*Barium enema*
- **Barium enema is generally contraindicated in acute diverticulitis** due to the risk of **perforation** and the introduction of barium into the peritoneum, which can cause severe peritonitis.
- It has largely been replaced by **CT scanning** for its superior safety profile and diagnostic accuracy in acute abdominal conditions.
Abdominal emergencies US Medical PG Question 3: A 34-year-old male is brought to the emergency department by fire and rescue following a motor vehicle accident in which the patient was an unrestrained driver. The paramedics report that the patient was struck from behind by a drunk driver. He was mentating well at the scene but complained of pain in his abdomen. The patient has no known past medical history. In the trauma bay, his temperature is 98.9°F (37.2°C), blood pressure is 86/51 mmHg, pulse is 138/min, and respirations are 18/min. The patient is somnolent but arousable to voice and pain. His lungs are clear to auscultation bilaterally. He is diffusely tender to palpation on abdominal exam with bruising over the left upper abdomen. His distal pulses are thready, and capillary refill is delayed bilaterally. Two large-bore peripheral intravenous lines are placed to bolus him with intravenous 0.9% saline. Chest radiograph shows multiple left lower rib fractures.
Which of the following parameters is most likely to be seen in this patient?
- A. Increased cardiac output
- B. Increased mixed venous oxygen saturation
- C. Decreased pulmonary capillary wedge pressure (Correct Answer)
- D. Decreased systemic vascular resistance
- E. Increased right atrial pressure
Abdominal emergencies Explanation: ***Decreased pulmonary capillary wedge pressure***
- The patient presents with classic signs of **hemorrhagic shock** (hypotension, tachycardia, somnolence, abdominal bruising, thready pulses) due to trauma, likely involving the spleen or kidney given the left upper abdominal bruising and rib fractures.
- **Decreased pulmonary capillary wedge pressure (PCWP)** is expected in hypovolemic shock because it reflects left atrial and left ventricular end-diastolic pressure, which will be low due to reduced venous return and intravascular volume.
*Increased cardiac output*
- In **hemorrhagic shock**, the body attempts to compensate by increasing heart rate, but overall **cardiac output is typically decreased** due to profound reduction in preload (venous return) from blood loss.
- While heart rate is elevated, the stroke volume is severely diminished, leading to a net decrease in cardiac output despite compensatory efforts.
*Increased mixed venous oxygen saturation*
- **Mixed venous oxygen saturation (SvO2)** is generally **decreased in hemorrhagic shock** due to increased oxygen extraction by tissues.
- Inadequate oxygen delivery to the tissues forces them to extract more oxygen from the blood, leading to a lower SvO2.
*Decreased systemic vascular resistance*
- In **hemorrhagic shock**, the body activates compensatory mechanisms, including generalized **vasoconstriction**, to maintain blood pressure and prioritize blood flow to vital organs.
- This leads to an **increased systemic vascular resistance (SVR)**, not decreased, as reflected by the thready distal pulses and delayed capillary refill.
*Increased right atrial pressure*
- **Right atrial pressure (RAP)**, representing CVP, is typically **decreased in hemorrhagic shock** due to reduced circulating blood volume.
- A lower RAP indicates decreased venous return to the heart, a hallmark of hypovolemia.
Abdominal emergencies US Medical PG Question 4: A 51-year-old man with a recent diagnosis of peptic ulcer disease currently treated with an oral proton pump inhibitor twice daily presents to the urgent care center complaining of acute abdominal pain which began suddenly less than 2 hours ago. On physical exam, you find his abdomen to be mildly distended, diffusely tender to palpation, and positive for rebound tenderness. Given the following options, what is the next best step in patient management?
- A. Serum gastrin level
- B. Urgent CT abdomen and pelvis (Correct Answer)
- C. H. pylori testing
- D. Abdominal radiographs
- E. Upper endoscopy
Abdominal emergencies Explanation: ***Urgent CT abdomen and pelvis***
- The sudden onset of severe abdominal pain, diffuse tenderness, and **rebound tenderness** in a patient with a history of peptic ulcer disease (PUD) suggests a **perforated ulcer**, which is a surgical emergency.
- A CT scan is the **most sensitive imaging modality** for detecting **free air** (pneumoperitoneum) and can confirm the diagnosis with >95% sensitivity, helping to localize the perforation and identify complications such as abscess formation.
- CT also helps evaluate alternative diagnoses in the acute abdomen and provides detailed anatomic information for surgical planning.
*Serum gastrin level*
- This test is primarily used in the diagnosis of **Zollinger-Ellison syndrome**, a rare condition characterized by gastrinomas leading to severe, refractory PUD.
- It is not indicated in an acute emergency setting with signs of perforation, as it would delay critical diagnostic imaging and management.
*H. pylori testing*
- **_H. pylori_ infection** is a common cause of PUD, but testing for it is part of routine initial management or follow-up for chronic disease.
- Testing would not address the immediate life-threatening complication of suspected perforation and would delay definitive diagnosis.
*Abdominal radiographs*
- An upright chest X-ray or abdominal radiograph can detect **free air under the diaphragm** in cases of perforation and is a reasonable initial imaging test.
- However, plain radiographs have lower sensitivity (75-80%) compared to CT scan and may miss smaller perforations or provide insufficient information about the location and extent of injury.
- In modern practice with readily available CT, cross-sectional imaging is preferred for its superior diagnostic accuracy in evaluating the acute abdomen.
*Upper endoscopy*
- **Upper endoscopy** is a valuable diagnostic and therapeutic tool for stable PUD but is **absolutely contraindicated** in cases of suspected or confirmed hollow viscus perforation.
- Introducing an endoscope with air insufflation could worsen the perforation and lead to further contamination of the peritoneal cavity, increasing morbidity and mortality.
Abdominal emergencies US Medical PG Question 5: A 42-year-old man presents to the emergency department with abdominal pain. The patient was at home watching television when he experienced sudden and severe abdominal pain that prompted him to instantly call emergency medical services. The patient has a past medical history of obesity, smoking, alcoholism, hypertension, and osteoarthritis. His current medications include lisinopril and ibuprofen. His temperature is 98.5°F (36.9°C), blood pressure is 120/97 mmHg, pulse is 130/min, respirations are 22/min, and oxygen saturation is 97% on room air. The patient is in an antalgic position on the stretcher. His abdomen is rigid and demonstrates rebound tenderness and hypoactive bowel sounds. What is the next best step in management?
- A. CT of the abdomen
- B. Urgent laparoscopy
- C. NPO, IV fluids, and analgesics
- D. Urgent laparotomy (Correct Answer)
- E. Abdominal radiograph
Abdominal emergencies Explanation: ***Urgent laparotomy***
- The patient's presentation with **sudden, severe abdominal pain**, a **rigid abdomen**, **rebound tenderness**, and **hypoactive bowel sounds** indicates **acute peritonitis**, most likely from a **perforated viscus**.
- In a patient with **frank peritonitis** and clinical signs of perforation, the diagnosis is **made clinically** based on physical examination findings.
- **Urgent laparotomy** (exploratory surgery) is the definitive management and should not be delayed for imaging when peritonitis is obvious.
- The patient's risk factors (NSAID use, alcoholism) further support peptic ulcer perforation as the likely etiology.
*CT of the abdomen*
- While CT scan is highly sensitive for identifying perforation and can provide anatomic detail, it is **not necessary when the diagnosis of peritonitis is clinically evident**.
- In a patient with **obvious peritonitis**, obtaining a CT scan would **delay definitive surgical treatment** without changing management.
- CT is more appropriate for stable patients with **uncertain diagnosis** or equivocal physical findings, not for those with frank peritonitis.
*Urgent laparoscopy*
- **Laparoscopy** can be used diagnostically and therapeutically in selected cases of abdominal emergencies.
- However, in a patient with diffuse peritonitis and suspected perforation, **laparotomy** is generally preferred over laparoscopy as it provides better exposure, faster source control, and easier peritoneal lavage.
- Laparoscopy may be considered in stable patients with localized findings, but this patient has signs of diffuse peritonitis.
*NPO, IV fluids, and analgesics*
- These are **essential supportive measures** and should be initiated immediately as part of resuscitation.
- However, they are **adjunctive** to definitive surgical management and do not constitute the "next best step" in a patient requiring emergency surgery.
- These measures should be initiated concurrently while preparing for urgent laparotomy.
*Abdominal radiograph*
- An **upright chest X-ray** or **abdominal radiograph** can show **free air under the diaphragm** (pneumoperitoneum) in cases of perforation.
- However, it is **only 50-70% sensitive**, meaning it misses many perforations.
- In a patient with **clinical peritonitis**, the absence of free air on X-ray does **not rule out perforation** and should not delay surgery.
- Imaging should not delay surgical intervention when peritonitis is clinically evident.
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