An 82-year-old nursing home resident presents with a 24-hour history of abdominal distension and pain. She has advanced dementia and is normally bed-bound. Abdominal X-ray shows a grossly dilated colon measuring 14 cm at the caecum with no mechanical obstruction evident. Vital signs: temperature 37.2°C, heart rate 92 bpm, blood pressure 125/75 mmHg. Abdomen is distended but soft with no peritonism. What is the most appropriate initial management?
Q242
A 42-year-old woman presents with right upper quadrant pain and fever 12 hours after undergoing ERCP for choledocholithiasis. Temperature is 38.9°C, heart rate 118 bpm, blood pressure 95/60 mmHg. Examination reveals right upper quadrant tenderness and guarding. CT abdomen shows retroperitoneal gas tracking along the duodenum. What is the most appropriate immediate management?
Q243
A 76-year-old man presents with a 4-day history of worsening abdominal pain and distension. He has not passed flatus or stool for 3 days. Past history includes a sigmoid colectomy for diverticular disease 8 years ago. CT shows dilated small bowel up to 4 cm with a distinct transition point in the right iliac fossa, and collapsed bowel distally. There is a small amount of free fluid but no pneumoperitoneum. Lactate is 2.8 mmol/L. Which finding would most strongly indicate the need for immediate surgical intervention?
Q244
Which of the following radiological signs on plain abdominal X-ray is most specific for closed loop small bowel obstruction?
Q245
A 55-year-old woman with known gallstones presents with severe epigastric pain radiating to the back, nausea, and vomiting. Blood tests reveal amylase 1850 U/L, CRP 180 mg/L, calcium 1.95 mmol/L, WCC 14.2 × 10⁹/L. The Glasgow score is 3. She is started on IV fluids and analgesia. At what point should cholecystectomy ideally be performed?
Q246
A 28-year-old woman who is 32 weeks pregnant presents with sudden onset severe abdominal pain and vomiting. She is tachycardic at 120 bpm, blood pressure 105/70 mmHg. Abdominal examination reveals generalized tenderness with guarding, more pronounced in the right upper quadrant. What is the most appropriate immediate investigation to identify the cause of an acute abdomen in this patient?
Q247
A 68-year-old man with no previous abdominal surgery presents with a 5-day history of progressive abdominal distension, cramping pain, and obstipation. Abdominal examination reveals a grossly distended abdomen with tympanic percussion. Abdominal X-ray shows a massively dilated loop of bowel in the right upper quadrant measuring 12 cm in diameter with haustra visible. What is the most likely diagnosis?
Q248
A 35-year-old man presents with right iliac fossa pain, fever, and vomiting for 18 hours. Examination reveals localized guarding in the right iliac fossa. Blood tests show WCC 15.3 × 10⁹/L, CRP 85 mg/L. CT abdomen demonstrates a dilated, thick-walled appendix with surrounding fat stranding and a small amount of free fluid. There is no abscess or perforation. What is the most appropriate management according to current evidence?
Q249
A 58-year-old woman presents with a 48-hour history of colicky abdominal pain, distension, and absolute constipation. She has had three previous laparotomies for gynecological conditions. Abdominal X-ray shows multiple dilated loops of small bowel with valvulae conniventes and no gas in the colon. She is hemodynamically stable with a soft but distended abdomen and normal inflammatory markers. What is the most appropriate initial management?
Q250
Which of the following is the most common cause of small bowel obstruction in patients with no previous abdominal surgery?
Acute Surgical Presentations UK Medical PG Practice Questions and MCQs
Question 241: An 82-year-old nursing home resident presents with a 24-hour history of abdominal distension and pain. She has advanced dementia and is normally bed-bound. Abdominal X-ray shows a grossly dilated colon measuring 14 cm at the caecum with no mechanical obstruction evident. Vital signs: temperature 37.2°C, heart rate 92 bpm, blood pressure 125/75 mmHg. Abdomen is distended but soft with no peritonism. What is the most appropriate initial management?
A. Emergency laparotomy with right hemicolectomy
B. Urgent colonoscopic decompression
C. Conservative management with nil by mouth, IV fluids, and neostigmine (Correct Answer)
D. Flexible sigmoidoscopy with flatus tube placement
E. Immediate CT abdomen to exclude perforation
Explanation: ***Conservative management with nil by mouth, IV fluids, and neostigmine***- This patient presents with **Ogilvie's syndrome** (acute colonic pseudo-obstruction), characterized by massive colonic dilatation without mechanical obstruction in an elderly, bed-bound patient.- Neostigmine, an **acetylcholinesterase inhibitor**, is indicated for prompt decompression in cases with significant colonic dilatation, especially when the **caecal diameter** exceeds 12 cm, to reduce the risk of perforation.*Emergency laparotomy with right hemicolectomy*- Surgical intervention is typically reserved for cases with **failed medical management** or evidence of **colonic ischemia** or **perforation** (e.g., peritonism, hemodynamic instability).- This patient is hemodynamically stable and has a soft abdomen without peritonism, making immediate surgery unnecessary and inappropriate as an initial step.*Urgent colonoscopic decompression*- This procedure is usually considered if **neostigmine** is contraindicated or if medical management fails to achieve decompression after 24-48 hours.- While effective, it carries a risk of **perforation** and is generally a second-line intervention after a trial of pharmacological treatment.*Flexible sigmoidoscopy with flatus tube placement*- This intervention is primarily used for **sigmoid volvulus** or distal colonic decompression.- Given the gross dilatation extending to the **caecum** (14 cm), a sigmoidoscopy alone would be insufficient for comprehensive decompression of the entire colon.*Immediate CT abdomen to exclude perforation*- While CT is valuable for confirming the absence of mechanical obstruction and detecting complications like perforation, the plain abdominal X-ray has already demonstrated massive colonic dilatation without obvious obstruction.- The patient's stable vital signs and absence of **peritonism** suggest no immediate perforation, making active decompression the priority rather than further imaging at this precise initial stage of management.
Question 242: A 42-year-old woman presents with right upper quadrant pain and fever 12 hours after undergoing ERCP for choledocholithiasis. Temperature is 38.9°C, heart rate 118 bpm, blood pressure 95/60 mmHg. Examination reveals right upper quadrant tenderness and guarding. CT abdomen shows retroperitoneal gas tracking along the duodenum. What is the most appropriate immediate management?
A. Broad-spectrum IV antibiotics and careful observation
B. Emergency laparotomy with duodenal repair (Correct Answer)
C. Repeat ERCP with stent placement
D. Percutaneous drainage of retroperitoneal collection
E. Conservative management as retroperitoneal air post-ERCP is benign
Explanation: ***Emergency laparotomy with duodenal repair***
- The patient exhibits **clinical peritonitis** (guarding, tenderness) and **septic shock** (hypotension, tachycardia) following ERCP, indicating a large or uncontained **duodenal perforation**.
- While post-ERCP air can sometimes be managed conservatively, findings of **hemodynamic instability** and **retroperitoneal gas tracking** necessitate immediate surgical intervention to contain the leak and prevent further sepsis.
*Broad-spectrum IV antibiotics and careful observation*
- Selective conservative management is reserved for **Stapfer Type II or III** injuries that are hemodynamically stable and lack signs of **peritonitis**.
- This patient's **hypotension** and **fever** indicate that non-operative management is insufficient and would likely lead to clinical deterioration.
*Repeat ERCP with stent placement*
- Re-intervention via ERCP is generally avoided in the setting of a massive **retroperitoneal air leak** and systemic instability as it may worsen the perforation.
- **Endoscopic clipping** or stenting is only feasible if the perforation is identified **immediately during the procedure** in a stable patient.
*Percutaneous drainage of retroperitoneal collection*
- Drainage is an adjunct therapy used for **localized abscesses** or specific fluid collections later in the clinical course, not as primary management for **acute perforation**.
- In the acute phase with **sepsis**, drainage does not address the underlying duodenal defect causing the contamination.
*Conservative management as retroperitoneal air post-ERCP is benign*
- Although **micro-perforations** can sometimes lead to benign pneumoretroperitoneum, this patient's **fever, tachycardia, and hypotension** clearly signify a clinically significant injury.
- Ignoring these symptoms based on the assumption that air is benign would be life-threatening due to the risk of **necrotizing retroperitoneal fasciitis** and escalating sepsis.
Question 243: A 76-year-old man presents with a 4-day history of worsening abdominal pain and distension. He has not passed flatus or stool for 3 days. Past history includes a sigmoid colectomy for diverticular disease 8 years ago. CT shows dilated small bowel up to 4 cm with a distinct transition point in the right iliac fossa, and collapsed bowel distally. There is a small amount of free fluid but no pneumoperitoneum. Lactate is 2.8 mmol/L. Which finding would most strongly indicate the need for immediate surgical intervention?
A. Small bowel dilatation of 4 cm
B. Duration of symptoms exceeding 72 hours
C. Presence of free fluid on CT
D. Reduced enhancement of the bowel wall at the transition point (Correct Answer)
E. Serum lactate of 2.8 mmol/L
Explanation: ***Reduced enhancement of the bowel wall at the transition point***- Reduced or absent **contrast enhancement** on CT is a highly specific sign of **bowel ischemia** or strangulation, necessitating immediate surgical exploration.- Signs of non-viable bowel, such as poor wall enhancement, override conservative management trials in **small bowel obstruction (SBO)**.*Duration of symptoms exceeding 72 hours*- While prolonged symptoms increase the cumulative risk of complications, duration alone is not a definitive mandate for **emergency surgery** if the clinical status is stable.- Many patients with **adhesion-related SBO** can be successfully managed conservatively (e.g., Gastrografin challenge) even after several days if no ischemia is present.*Small bowel dilatation of 4 cm*- A diameter of 4 cm confirms the diagnosis of **bowel obstruction** (threshold is typically >3 cm), but it does not differentiate between simple and **strangulated obstruction**.- The absolute caliber of the bowel does not dictate the urgency of surgery as much as the presence of **vascular compromise**.*Presence of free fluid on CT*- A small amount of **intraperitoneal free fluid** is a common, non-specific finding in both simple and complicated bowel obstructions.- While it can be associated with higher grades of obstruction, it does not confirm **infarction** or perforation in the absence of other specific CT findings.*Serum lactate of 2.8 mmol/L*- An elevated **lactate level** is suggestive of tissue hypoperfusion or **ischemia**, but it is non-specific and can be elevated due to dehydration or various systemic stressors.- Radiographic evidence of **bowel wall ischemia** is a more direct and stronger anatomical indicator for immediate surgical intervention than a mildly elevated lactate.
Question 244: Which of the following radiological signs on plain abdominal X-ray is most specific for closed loop small bowel obstruction?
A. Multiple air-fluid levels on erect film
B. Single dilated loop in a C-shape or U-shape configuration (Correct Answer)
C. Dilated loops of small bowel >3 cm
D. Absence of gas in the rectum
E. Valvulae conniventes crossing the entire bowel width
Explanation: ***Single dilated loop in a C-shape or U-shape configuration***
- This appearance, often referred to as the **'coffee bean' sign** or **pseudotumor sign**, is highly specific for a **closed loop obstruction** where two points of the bowel are obstructed.
- It indicates a surgical emergency because entrapment of the loop leads to rapid **ischemia**, **strangulation**, and potential perforation due to impaired vascular supply.
*Multiple air-fluid levels on erect film*
- While a hallmark of **small bowel obstruction**, this finding is non-specific and can be seen in **adynamic ileus** or simple mechanical obstructions.
- It does not differentiate between a standard obstruction and the higher-risk **closed loop** variety.
*Dilated loops of small bowel >3 cm*
- This is a general diagnostic criterion for **small bowel dilatation** based on the **'3-6-9 rule'**, suggesting some form of obstruction or ileus is present.
- It lacks the specificity to identify the **tethered ends** characteristic of a closed loop entrapment.
*Absence of gas in the rectum*
- The lack of distal gas indicates a **complete obstruction** rather than a partial one, as air cannot pass the point of blockage.
- While it supports the diagnosis of an acute abdomen, it does not confirm the **anatomical configuration** of a closed loop.
*Valvulae conniventes crossing the entire bowel width*
- These are anatomical landmarks used to distinguish **small bowel** (crossing fully) from the **large bowel haustra** (crossing partially).
- Identifying these helps localize the obstruction to the small intestine but does not provide information regarding the **mechanism of closure**.
Question 245: A 55-year-old woman with known gallstones presents with severe epigastric pain radiating to the back, nausea, and vomiting. Blood tests reveal amylase 1850 U/L, CRP 180 mg/L, calcium 1.95 mmol/L, WCC 14.2 × 10⁹/L. The Glasgow score is 3. She is started on IV fluids and analgesia. At what point should cholecystectomy ideally be performed?
A. Immediately, as emergency surgery
B. During the same admission once clinically improved (Correct Answer)
C. After ERCP with sphincterotomy
D. 6-8 weeks after complete resolution
E. Only if recurrent pancreatitis occurs
Explanation: ***During the same admission once clinically improved*** - For **gallstone pancreatitis**, current guidelines recommend **definitive management** (cholecystectomy) during the **same hospital admission** to prevent recurrent biliary events. - Performing the procedure once the **inflammatory response** (e.g., CRP and pain) has subsided effectively reduces the high risk of **recurrent pancreatitis** seen with delayed surgery. *Immediately, as emergency surgery* - **Emergency cholecystectomy** is not indicated during the hyper-acute phase of pancreatitis as it increases **surgical morbidity** and mortality. - Surgery should only be performed immediately if there is a concurrent diagnosis of **acute cholecystitis** or gangrene. *After ERCP with sphincterotomy* - **ERCP** is indicated only if there is evidence of **cholangitis** or persistent **biliary obstruction**; it is not a routine requirement before cholecystectomy. - While ERCP with **sphincterotomy** reduces recurrence risk in patients unfit for surgery, it does not replace the need for duct clearance or gallbladder removal. *6-8 weeks after complete resolution* - **Delayed cholecystectomy** was previously common but is now discouraged due to a **30-40% risk** of recurrent biliary complications while waiting for surgery. - Current standards favor **early intervention** within the index admission or within two weeks of discharge. *Only if recurrent pancreatitis occurs* - Gallstone pancreatitis itself is a definitive indication for **cholecystectomy** to prevent life-threatening **recurrent attacks**. - Waiting for a second episode significantly increases **patient risk** and cumulative healthcare costs.
Question 246: A 28-year-old woman who is 32 weeks pregnant presents with sudden onset severe abdominal pain and vomiting. She is tachycardic at 120 bpm, blood pressure 105/70 mmHg. Abdominal examination reveals generalized tenderness with guarding, more pronounced in the right upper quadrant. What is the most appropriate immediate investigation to identify the cause of an acute abdomen in this patient?
A. MRI abdomen and pelvis
B. Abdominal ultrasound (Correct Answer)
C. CT abdomen and pelvis with IV contrast
D. Diagnostic laparoscopy
E. Erect chest X-ray with abdominal shield
Explanation: ***Abdominal ultrasound***
- **Abdominal ultrasound** is the **first-line imaging modality** for acute abdominal pain in pregnant patients due to its **safety** for both mother and fetus (no ionizing radiation) and its **accessibility**.
- It is highly effective for evaluating common obstetric (e.g., **placental abruption**) and non-obstetric (e.g., **cholecystitis**, appendicitis, ovarian torsion) causes, especially given the right upper quadrant tenderness suggesting **biliary pathology**.
*MRI abdomen and pelvis*
- **MRI** is a valuable imaging tool in pregnancy as it avoids **ionizing radiation** and provides excellent soft-tissue detail, making it a suitable **second-line option** if ultrasound is inconclusive.
- However, it is generally **less available**, more **time-consuming**, and often more expensive than ultrasound, thus not typically the immediate first-choice investigation in an acute setting.
*CT abdomen and pelvis with IV contrast*
- **CT scans** are generally **contraindicated in pregnancy** due to the significant risk of **ionizing radiation exposure** to the fetus, which can lead to teratogenic effects or increased lifetime cancer risk.
- While it offers rapid, comprehensive imaging, its use is reserved for **life-threatening emergencies** when other safer modalities are insufficient and the benefits clearly outweigh the fetal risks, which is not the case for an *immediate* first-line investigation in this scenario.
*Diagnostic laparoscopy*
- This is an **invasive surgical procedure** that is both diagnostic and potentially therapeutic, making it an intervention rather than an initial imaging investigation.
- It carries inherent risks in pregnancy, particularly in the **third trimester**, such as potential **uterine injury** or complications from **pneumoperitoneum**, and is only considered when less invasive methods fail or a surgical emergency is highly suspected and requires immediate intervention.
*Erect chest X-ray with abdominal shield*
- An **erect chest X-ray** is primarily used to detect **free air under the diaphragm** (pneumoperitoneum), indicative of a perforated viscus, which is a specific and less common cause of acute abdomen.
- While it involves minimal **ionizing radiation** with shielding, it has **limited diagnostic utility** for the broad differential diagnoses of acute abdominal pain in pregnancy and does not provide comprehensive abdominal organ assessment.
Question 247: A 68-year-old man with no previous abdominal surgery presents with a 5-day history of progressive abdominal distension, cramping pain, and obstipation. Abdominal examination reveals a grossly distended abdomen with tympanic percussion. Abdominal X-ray shows a massively dilated loop of bowel in the right upper quadrant measuring 12 cm in diameter with haustra visible. What is the most likely diagnosis?
A. Sigmoid volvulus
B. Caecal volvulus (Correct Answer)
C. Large bowel obstruction secondary to carcinoma
D. Pseudo-obstruction (Ogilvie's syndrome)
E. Small bowel obstruction
Explanation: ***Caecal volvulus***- The presence of a massively dilated loop (12 cm) with **haustra visible** located in the **right upper quadrant (RUQ)** is a classic radiological sign for caecal volvulus.- This condition arises from the torsion of an **abnormally mobile caecum**, allowing it to displace from its usual position and undergo significant distension. *Sigmoid volvulus*- This typically presents with a large, distended loop forming a characteristic **'coffee bean' sign** or an inverted U-shape, often originating from the pelvis and extending towards the diaphragm, usually in the **left upper quadrant (LUQ)**.- Unlike the caecum, the massively distended sigmoid colon in volvulus typically **lacks visible haustral markings** due to the extreme stretching of its wall. *Large bowel obstruction secondary to carcinoma*- Malignant obstruction usually leads to **proximal colonic dilatation** up to a distinct **transition point** at the tumor site, which is not described as a single massively dilated loop.- Such an obstruction might also present with a more insidious onset or signs of chronic illness, rather than an isolated, acutely distended loop. *Pseudo-obstruction (Ogilvie's syndrome)*- Ogilvie's syndrome is characterized by **massive dilatation** of the colon, often involving the right colon and transverse colon, in the absence of a mechanical obstruction, typically in elderly or hospitalized patients with comorbidities.- While it causes significant colonic distension, the X-ray finding of a *single massively dilated loop* in the RUQ is less consistent with the more diffuse dilatation seen in pseudo-obstruction. *Small bowel obstruction*- Small bowel obstruction typically shows central dilated loops with **valvulae conniventes** (which traverse the entire diameter of the lumen), distinguishing them from **haustra**.- Small bowel loops rarely reach a diameter of **12 cm**; significant small bowel dilatation usually peaks around 5-6 cm, and patients often experience earlier and more prominent vomiting.
Question 248: A 35-year-old man presents with right iliac fossa pain, fever, and vomiting for 18 hours. Examination reveals localized guarding in the right iliac fossa. Blood tests show WCC 15.3 × 10⁹/L, CRP 85 mg/L. CT abdomen demonstrates a dilated, thick-walled appendix with surrounding fat stranding and a small amount of free fluid. There is no abscess or perforation. What is the most appropriate management according to current evidence?
A. IV antibiotics with interval appendicectomy in 6-8 weeks
B. Emergency laparoscopic appendicectomy within 24 hours (Correct Answer)
C. Conservative management with oral antibiotics as outpatient
D. IV antibiotics for 48 hours then reassess
E. Open appendicectomy only if symptoms worsen
Explanation: ***Emergency laparoscopic appendicectomy within 24 hours***- The patient presents with classic signs and symptoms of **acute uncomplicated appendicitis**, including right iliac fossa pain, fever, vomiting, localized guarding, elevated WCC and CRP, and CT findings of a dilated, thick-walled appendix with fat stranding but no abscess or perforation. - Current evidence strongly supports **emergency laparoscopic appendicectomy** as the most appropriate definitive management, ideally performed within 24 hours, to prevent progression to perforation and minimize complications.*IV antibiotics with interval appendicectomy in 6-8 weeks*- This management strategy is typically reserved for cases of **appendix mass** or **phlegmon**, where acute inflammation has walled off, making immediate surgery more challenging.- The CT findings explicitly state
Question 249: A 58-year-old woman presents with a 48-hour history of colicky abdominal pain, distension, and absolute constipation. She has had three previous laparotomies for gynecological conditions. Abdominal X-ray shows multiple dilated loops of small bowel with valvulae conniventes and no gas in the colon. She is hemodynamically stable with a soft but distended abdomen and normal inflammatory markers. What is the most appropriate initial management?
A. Immediate laparotomy
B. Conservative management with nasogastric decompression and IV fluids (Correct Answer)
C. Water-soluble contrast study followed by observation
D. Urgent CT abdomen to identify transition point
E. Colonoscopic decompression
Explanation: ***Conservative management with nasogastric decompression and IV fluids*** - This patient presents with **adhesional small bowel obstruction (SBO)**; in the absence of **strangulation**, peritonitis, or hemodynamic instability, the standard of care is **'drip and suck'** management. - Conservative treatment resolves approximately 70-80% of adhesional SBO cases within 48-72 hours by allowing **decompression** of the bowel and restoring **fluid and electrolyte balance**.*Immediate laparotomy* - Urgent surgery is reserved for patients showing signs of **bowel ischemia**, necrosis, or **peritonitis**, such as fever, tachycardia, or localized guarding. - In stable patients, unnecessary surgery for adhesions can lead to further **adhesion formation** and long-term morbidity.*Water-soluble contrast study followed by observation* - While **Gastrografin** is useful for predicting the need for surgery and may have a **therapeutic effect**, the primary initial step is stabilization and decompression. - Guidelines often recommend the contrast study if the obstruction does not resolve within the first 24 hours of standard **conservative management**.*Urgent CT abdomen to identify transition point* - While **CT with IV contrast** is the gold standard for diagnosing the cause and site of SBO, the diagnosis is already clear from the **clinical history** and **X-ray findings**. - CT is most indicated if there is a suspicion of a **closed-loop obstruction** or if the patient fails to improve with conservative measures.*Colonoscopic decompression* - This procedure is indicated for **large bowel obstructions**, specifically **sigmoid volvulus** or **Ogilvie syndrome**, rather than small bowel obstruction. - Small bowel loops with **valvulae conniventes** and an empty colon confirm the pathology is proximal to the **ileocaecal valve**.
Question 250: Which of the following is the most common cause of small bowel obstruction in patients with no previous abdominal surgery?
A. Adhesions
B. Inguinal hernia (Correct Answer)
C. Malignancy
D. Crohn's disease
E. Intussusception
Explanation: ***Inguinal hernia***
- In patients with a **virgin abdomen** (no previous surgery), **hernias** are the most common cause of small bowel obstruction (SBO).
- These are often **incarcerated** or **strangulated**, requiring a thorough physical examination of the **groin orifices** to avoid missing the diagnosis.
*Adhesions*
- Adhesions are the overall **most common cause** of SBO in industrialized nations, but they almost exclusively occur following **previous abdominal surgery**.
- Since the patient described has no surgical history, adhesions are a significantly less likely cause compared to **extrinsic compression** from hernias.
*Malignancy*
- Primary or metastatic **malignancies** represent the third most common cause of SBO but are less frequent than hernias in patients without prior surgery.
- Obstructions due to malignancy are often associated with **weight loss**, **anemia**, or a more **subacute presentation**.
*Crohn's disease*
- This inflammatory condition can cause SBO through **stricture formation** or **acute inflammation** and edema.
- While a significant cause in younger populations, it is statistically less common as a first-presentation cause of obstruction than **hernias**.
*Intussusception*
- Intussusception occurs when one segment of the bowel **telescopes** into another, usually due to a **pathologic lead point** in adults.
- This is a rare cause of SBO in adults compared to children and is much less common than **inguinal hernias**.
