Gastrointestinal Surgery US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Gastrointestinal Surgery. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Gastrointestinal Surgery US Medical PG Question 1: A 27-year-old female has a history of periodic bloody diarrhea over several years. Colonoscopy shows sigmoid colon inflammation, and the patient complains of joint pain in her knees and ankles. You suspect inflammatory bowel disease. Which of the following would suggest a diagnosis of Crohn disease:
- A. Jaundice
- B. Mucosal and submucosal ulcerations
- C. Perianal fistula (Correct Answer)
- D. Loss of large bowel haustra
- E. Left lower quadrant pain
Gastrointestinal Surgery Explanation: ***Perianal fistula***
- The presence of a **perianal fistula** is highly characteristic of **Crohn disease** due to its **transmural inflammation**, which can extend through the bowel wall and form tracts to the skin.
- While other inflammatory bowel disease (IBD) symptoms like bloody diarrhea and joint pain are present, a fistula specifically points towards Crohn disease rather than ulcerative colitis.
*Jaundice*
- **Jaundice** is not a typical manifestation of Crohn disease itself, though it can occur as a complication if there is associated **primary sclerosing cholangitis (PSC)**, which is more commonly linked with **ulcerative colitis**.
- It would suggest a primary liver issue or biliary obstruction, rather than directly supporting a diagnosis of Crohn disease.
*Mucosal and submucosal ulcerations*
- While **ulcerations** are a feature of both ulcerative colitis and Crohn disease, the description of **mucosal and submucosal ulcerations** is not specific enough to differentiate between them.
- In Crohn disease, ulcers tend to be **scattered** and **deep ("cobblestoning")**, potentially extending transmurally, whereas in ulcerative colitis, they are typically more **superficial** and **continuous**.
*Loss of large bowel haustra*
- **Loss of haustra**, also known as **"lead pipe" appearance**, is a characteristic finding in chronic **ulcerative colitis** due to continuous inflammation and fibrosis, leading to a straightened appearance of the colon.
- This finding is less typical for Crohn disease, which often has **skip lesions** and can involve any part of the gastrointestinal tract.
*Left lower quadrant pain*
- **Left lower quadrant pain** can be associated with inflammation in the **descending or sigmoid colon**, which can occur in both Crohn disease and ulcerative colitis.
- Therefore, this symptom is **non-specific** and does not help to differentiate between the two conditions.
Gastrointestinal Surgery US Medical PG Question 2: A 32-year-old man comes to the emergency department because of recurrent episodes of vomiting for 1 day. He has had over 15 episodes of bilious vomiting. During this period he has had cramping abdominal pain but has not had a bowel movement or passed flatus. He does not have fever or diarrhea. He was diagnosed with Crohn disease at the age of 28 years which has been well controlled with oral mesalamine. He underwent a partial small bowel resection for midgut volvulus at birth. His other medications include vitamin B12, folic acid, loperamide, ferrous sulfate, and vitamin D3. He appears uncomfortable and his lips are parched. His temperature is 37.1°C (99.3°F), pulse is 103/min, and blood pressure is 104/70 mm Hg. The abdomen is distended, tympanitic, and tender to palpation over the periumbilical area and the right lower quadrant. Rectal examination is unremarkable. A CT scan of the abdomen shows multiple dilated loops of small bowel with a transition zone in the mid to distal ileum. After 24 hours of conservative management with IV fluid resuscitation, nasogastric bowel decompression, promethazine, and analgesia, his condition does not improve and a laparotomy is scheduled. During the laparotomy, two discrete strictures are noted in the mid-ileum, around 20 cm apart. Which of the following is the most appropriate next step in management?
- A. Small bowel resection with ileostomy
- B. Abdominal closure and start palliative care
- C. Small bowel resection and primary anastomosis
- D. Strictureplasty of individual strictures (Correct Answer)
- E. Ileocolectomy
Gastrointestinal Surgery Explanation: ***Strictureplasty of individual strictures***
- This patient presents with **multiple strictures** in the mid-ileum causing a small bowel obstruction in the setting of **Crohn's disease**. Strictureplasty is the preferred surgical approach for *short, multiple (up to four), or recurrent Crohn's disease strictures* as it preserves bowel length.
- While small bowel resection is an option, **strictureplasty** is favored in Crohn's disease to *avoid short bowel syndrome*, especially if multiple strictures are present, as seen here.
*Small bowel resection with ileostomy*
- An ileostomy is typically created when a primary anastomosis is not safe due to high risk of leak (e.g., severe inflammation, peritonitis, patient instability) or when there is extensive disease not amenable to strictureplasty with primary anastomosis.
- Performing an ileostomy when primary anastomosis is possible unnecessarily creates a stoma, which can lead to complications and impact quality of life.
*Abdominal closure and start palliative care*
- This patient, while acutely unwell, has a surgically correctable cause for his obstruction and is not described as having an incurable or end-stage condition necessitating only palliative care.
- Palliative care would be considered for patients with widespread untreatable disease or severe comorbidities, which is not indicated here given the localized, treatable strictures.
*Small bowel resection and primary anastomosis*
- While small bowel resection is a valid treatment for isolated, non-recurrent strictures, strictureplasty is generally preferred in Crohn's disease when multiple strictures are present.
- **Resection of multiple segments** can lead to significant **short bowel syndrome**, especially in a patient with a history of prior small bowel resection, making strictureplasty a more bowel-sparing and appropriate choice.
*Ileocolectomy*
- **Ileocolectomy** involves resection of the terminal ileum and a portion of the colon. This would be indicated if the disease involves the *ileocecal valve region* or the *colon*, which is not the case in this patient, whose strictures are in the mid-ileum.
- This procedure is excessive for mid-ileal strictures and would result in unnecessary removal of healthy bowel given the location of the strictures.
Gastrointestinal Surgery US Medical PG Question 3: A 65-year-old man presents to his primary care physician for a pre-operative evaluation. He is scheduled for cataract surgery in 3 weeks. His past medical history is notable for diabetes, hypertension, and severe osteoarthritis of the right knee. His medications include metformin, hydrochlorothiazide, lisinopril, and aspirin. His surgeon ordered blood work 1 month ago, which showed a hemoglobin of 14.2 g/dL, INR of 1.2, and a hemoglobin A1c of 6.9%. His vital signs at the time of the visit show BP: 130/70 mmHg, Pulse: 80, RR: 12, and T: 37.2 C. He has no current complaints and is eager for his surgery. Which of the following is the most appropriate course of action for this patient at this time?
- A. Tell the patient he will have to delay his surgery for at least 1 year
- B. Medically clear the patient for surgery (Correct Answer)
- C. Repeat the patient's CBC and coagulation studies
- D. Schedule the patient for a stress test and ask him to delay surgery for at least 6 months
- E. Perform an EKG
Gastrointestinal Surgery Explanation: **Medically clear the patient for surgery**
- The patient's **blood pressure is well-controlled** (130/70 mmHg), and his **hemoglobin A1c of 6.9%** indicates good glycemic control, both of which are favorable for elective surgery.
- He is currently on **aspirin**, which, for cataract surgery (a low-risk bleeding procedure), can generally be continued, and his **INR of 1.2 is within a safe range** for surgery.
*Tell the patient he will have to delay his surgery for at least 1 year*
- There are **no indications for such a prolonged delay** based on the provided clinical information.
- His chronic conditions (diabetes, hypertension) are **adequately managed**, and his lab values are acceptable.
*Repeat the patient's CBC and coagulation studies*
- The **existing blood work from 1 month ago is recent enough** for a pre-operative evaluation for cataract surgery, especially with no new symptoms.
- Repeating these tests without a clinical indication would be **unnecessary and inefficient**.
*Schedule the patient for a stress test and ask him to delay surgery for at least 6 months*
- The patient has **no active cardiac symptoms** (e.g., chest pain, shortness of breath), and his well-controlled hypertension does not automatically warrant a stress test for low-risk surgery.
- A stress test and a **6-month delay are not indicated** for a low-risk procedure like cataract surgery in an asymptomatic patient.
*Perform an EKG*
- While an EKG might be considered in some pre-operative evaluations for patients with cardiac risk factors, there are **no specific symptoms or significant new risk factors** presented that necessitate an EKG for this low-risk cataract surgery.
- Given his stable condition and controlled hypertension, an EKG is **not a mandatory part of medical clearance** for this procedure.
Gastrointestinal Surgery US Medical PG Question 4: An epidemiologist is evaluating the efficacy of Noxbinle in preventing HCC deaths at the population level. A clinical trial shows that over 5 years, the mortality rate from HCC was 25% in the control group and 15% in patients treated with Noxbinle 100 mg daily. Based on this data, how many patients need to be treated with Noxbinle 100 mg to prevent, on average, one death from HCC?
- A. 20
- B. 73
- C. 10 (Correct Answer)
- D. 50
- E. 100
Gastrointestinal Surgery Explanation: ***10***
- The **number needed to treat (NNT)** is calculated by first finding the **absolute risk reduction (ARR)**.
- **ARR** = Risk in control group - Risk in treatment group = 25% - 15% = **10%** (or 0.10).
- **NNT = 1 / ARR** = 1 / 0.10 = **10 patients**.
- This means that **10 patients must be treated with Noxbinle to prevent one death from HCC** over 5 years.
*20*
- This would result from an ARR of 5% (1/0.05 = 20), which is not supported by the data.
- May arise from miscalculating the risk difference or incorrectly halving the actual ARR.
*73*
- This value does not correspond to any standard calculation of NNT from the given mortality rates.
- May result from confusion with other epidemiological measures or calculation error.
*50*
- This would correspond to an ARR of 2% (1/0.02 = 50), which significantly underestimates the actual risk reduction.
- Could result from incorrectly calculating the difference as a proportion rather than absolute percentage points.
*100*
- This would correspond to an ARR of 1% (1/0.01 = 100), grossly underestimating the treatment benefit.
- May result from confusing ARR with relative risk reduction or other calculation errors.
Gastrointestinal Surgery US Medical PG Question 5: A 38-year-old man comes to the physician because of a 2-week history of severe pain while passing stools. The stools are covered with bright red blood. He has been avoiding defecation because of the pain. Last year, he was hospitalized for pilonidal sinus surgery. He has had chronic lower back pain ever since he had an accident at his workplace 10 years ago. The patient's father was diagnosed with colon cancer at the age of 62. Current medications include oxycodone and gabapentin. He is 163 cm (5 ft 4 in) tall and weighs 100 kg (220 lb); BMI is 37.6 kg/m2. Vital signs are within normal limits. The abdomen is soft and nontender. Digital rectal examination was not performed because of severe pain. His hemoglobin is 16.3 mg/dL and his leukocyte count is 8300/mm3. Which of the following is the most appropriate next step in management?
- A. Anal sphincterotomy
- B. Colonoscopy
- C. Botulinum toxin injection
- D. Sitz baths and topical nifedipine (Correct Answer)
- E. Tract curettage
Gastrointestinal Surgery Explanation: ***Sitz baths and topical nifedipine***
- The patient's presentation of severe pain with defecation, bright red blood on stools, and avoidance of defecation is highly suggestive of an **anal fissure**.
- **Sitz baths** provide symptomatic relief by promoting muscle relaxation and increasing blood flow, while **topical nifedipine** acts as a calcium channel blocker to relax the internal anal sphincter, reducing pain and promoting healing.
*Anal sphincterotomy*
- This is a surgical procedure typically reserved for **chronic, refractory anal fissures** that have failed conservative management.
- Performing it as a first-line treatment is **premature** and carries higher risks compared to less invasive options.
*Colonoscopy*
- While the patient has a family history of colon cancer, the clinical presentation with **severe anal pain** and **bright red blood** primarily points to an anal fissure.
- A colonoscopy is generally indicated for evaluating suspicion of malignancy or other colonic pathology, not as an initial step for acute, localized anal pain attributed to a likely fissure.
*Botulinum toxin injection*
- **Botulinum toxin injection** is a treatment for anal fissures, similar to calcium channel blockers, by relaxing the internal anal sphincter.
- It is typically considered when topical treatments have failed, but before surgical intervention, making it not the very first step in management.
*Tract curettage*
- **Tract curettage** is a procedure primarily used for treating **anal fistulas** or **pilonidal cysts/sinuses**, which are different conditions from an anal fissure.
- The patient had pilonidal sinus surgery previously, but his current symptoms are consistent with an anal fissure, not a recurrence of pilonidal disease or an anal fistula.
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