Gastrointestinal Motility Disorders — MCQs
What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?
Corkscrew esophagus is seen in which of the following conditions ?
Achalasia cardia presents with all of the following except:
A 60-year-old man presents with foul breath and regurgitates food eaten 3 days ago. What is the most likely diagnosis?
Esophageal manometry is useful in diagnosing all of the following conditions EXCEPT:
Which of the following drugs can cause hypertrophic pyloric stenosis?
A patient with diabetic gastroparesis is treated with erythromycin primarily due to its ability to:
Which extra-intestinal symptom of inflammatory bowel disease worsens with exacerbation of disease activity?
What is the MOST COMMON side effect of vagal nerve stimulation?
A patient presents with difficulty with swallowing liquids but not solids. The best investigation to make a diagnosis is
Gastrointestinal Motility Disorders Indian Medical PG Practice Questions and MCQs
Question 1: What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?
- A. Stool calprotectin (Correct Answer)
- B. pain in abdomen
- C. Diarrhoea
- D. Mucus in stools
Explanation: ***Stool calprotectin*** - **Stool calprotectin** is a reliable biomarker used to differentiate between **Inflammatory Bowel Disease (IBD)** and **Irritable Bowel Syndrome (IBS)**. It's a protein released by neutrophils during intestinal inflammation. - Elevated levels of **calprotectin** strongly suggest **mucosal inflammation** characteristic of IBD (Crohn's disease or ulcerative colitis), while normal levels are typical in IBS, which lacks inflammation [1]. *pain in abdomen* - **Abdominal pain** is a common symptom in both IBS and IBD. In IBS, it's often linked to altered bowel habits and is a key diagnostic criterion [1]. - In IBD, abdominal pain is typically due to inflammation, strictures, or abscesses, but its presence alone does not differentiate the conditions . *Diarrhoea* - **Diarrhea** is a prominent symptom in both IBS and IBD. In IBS, it can be a predominant feature (IBS-D), often associated with urgency [1]. - In IBD, diarrhea is usually due to inflammation disrupting normal absorption and secretion, and it may contain blood or mucus . *Mucus in stools* - The presence of **mucus in stools** can occur in both IBS and IBD. In IBS, it's often present without blood and is generally considered part of altered bowel function [1]. - In IBD, mucus in stools, particularly when accompanied by blood, strongly suggests active intestinal inflammation and mucosal damage .
Question 2: Corkscrew esophagus is seen in which of the following conditions ?
- A. Scleroderma
- B. Achalasia cardia
- C. Diffuse esophagus spasm (Correct Answer)
- D. Carcinoma esophagus
Explanation: ***Diffuse esophagus spasm*** - **Corkscrew esophagus** is a classic radiographic finding in **diffuse esophageal spasm (DES)**, indicating multiple simultaneous, non-peristaltic contractions. [1] - This condition is characterized by **uncoordinated esophageal contractions** that can lead to chest pain and dysphagia. [1] *Scleroderma* - Scleroderma typically causes **hypomotility** or aperistalsis in the esophagus, especially in the distal two-thirds, rather than a corkscrew appearance. [1] - It results from progressive **fibrosis and atrophy of the smooth muscle**, leading to esophageal dilation and reflux symptoms. [1] *Achalasia cardia* - Achalasia is defined by the **failure of the lower esophageal sphincter (LES) to relax** and loss of peristalsis in the esophageal body, leading to a "bird-beak" appearance on barium swallow. [2] - It features a **dilated esophagus** proximally to the tight LES, not multiple indentations. [2] *Carcinoma esophagus* - Esophageal carcinoma usually presents as a **focal stricture**, mass, or irregular lumen on imaging, often causing dysphagia that is progressive. - It does not typically cause the diffuse, segmental contractions characteristic of a corkscrew esophagus.
Question 3: Achalasia cardia presents with all of the following except:
- A. Increased lower esophagus sphincter tone
- B. Normal peristalsis (Correct Answer)
- C. Absence of peristalsis
- D. Dysphagia
Explanation: ***Normal peristalsis*** - Achalasia is characterized by the **absence of esophageal peristalsis**, specifically in the distal two-thirds of the esophagus [1]. - The presence of normal peristalsis would argue against a diagnosis of achalasia, as it is a core defining feature of the condition. *Increased lower esophagus sphincter tone* - Achalasia is defined by **incomplete relaxation of the lower esophageal sphincter (LES)** and often an **elevated resting LES pressure** [1]. - This increased tone contributes significantly to the difficulty in swallowing experienced by patients. *Absence of peristalsis* - A definitive diagnostic feature of achalasia is the **loss of primary and secondary peristalsis** in the esophageal body [1]. - This motor dysfunction prevents effective propulsion of food into the stomach. *Dysphagia* - **Dysphagia for both solids and liquids** is the most common presenting symptom of achalasia, progressing over months to years [1]. - It results from the impaired esophageal motility and the incomplete relaxation of the LES [1].
Question 4: A 60-year-old man presents with foul breath and regurgitates food eaten 3 days ago. What is the most likely diagnosis?
- A. Achalasia cardia
- B. Carcinoma esophagus
- C. Loss of tone of upper esophageal sphincter
- D. Zenker's Diverticulum (Correct Answer)
Explanation: ***Zenker's Diverticulum*** - This condition presents with a classic triad of **dysphagia**, **regurgitation of undigested food**, and **foul breath (halitosis)** due to food retention in the diverticulum. - The regurgitation of food eaten several days ago is highly characteristic, indicating significant pooling and decomposition within the **pharyngeal pouch**. *Achalasia cardia* - Characterized by **dysphagia for both solids and liquids** and regurgitation, but the regurgitated food is typically fresh or only recently ingested, not from several days prior. - The primary pathology is the **failure of the lower esophageal sphincter (LES) to relax** and loss of peristalsis in the esophageal body. *Carcinoma esophagus* - Often presents with **progressive dysphagia** (first for solids, then for liquids) and significant **weight loss**. - While regurgitation can occur, it's usually of recently ingested food and rarely associated with the severe halitosis from long-standing food decomposition seen in Zenker's. *Loss of tone of upper esophageal sphincter* - This condition would more likely lead to **regurgitation of stomach contents** into the pharynx, rather than the retention of food in a pouch. - It could contribute to **reflux symptoms** but does not explain the formation of a diverticulum or the prolonged food retention leading to foul breath.
Question 5: Esophageal manometry is useful in diagnosing all of the following conditions EXCEPT:
- A. Achalasia (a motility disorder)
- B. Diffuse esophageal spasm (a motility disorder)
- C. Malignancy (not typically diagnosed with this test) (Correct Answer)
- D. Assessment of esophageal motility prior to surgery for GERD
Explanation: ***Malignancy (not typically diagnosed with this test)*** - **Esophageal manometry** evaluates the **motor function** of the esophagus, measuring pressure changes during swallowing. - **Malignancy**, such as esophageal cancer, is primarily diagnosed with **endoscopy with biopsy** and imaging studies, not by assessing motility. *Achalasia (a motility disorder)* - **Esophageal manometry** is the **gold standard** for diagnosing achalasia, characterized by **absent peristalsis** in the esophageal body and **incomplete relaxation of the lower esophageal sphincter (LES)** [1]. - High-resolution manometry shows elevated **integrated relaxation pressure (IRP)** and often pan-esophageal pressurization. *Diffuse esophageal spasm (a motility disorder)* - This condition is also diagnosed by **esophageal manometry**, which reveals simultaneous, **non-peristaltic contractions** of high amplitude, often interspersed with normal peristalsis [1]. - It may also show **premature contractions** and **multiple rapid swallows** triggering spasm. *Assessment of esophageal motility prior to surgery for GERD* - **Manometry** is routinely performed before **anti-reflux surgery (e.g., Nissen fundoplication)** to rule out underlying esophageal motility disorders that could complicate surgery or worsen symptoms post-operatively [1]. - Identifying conditions like **achalasia** or **scleroderma** would contraindicate a standard fundoplication, as dysphagia could worsen [1].
Question 6: Which of the following drugs can cause hypertrophic pyloric stenosis?
- A. Nifedipine
- B. Vancomycin
- C. Phenyl propanolamine
- D. Erythromycin (Correct Answer)
Explanation: ***Erythromycin*** - **Erythromycin** use in infants, particularly during the first few weeks of life, has been associated with an increased risk of developing **hypertrophic pyloric stenosis**. - The mechanism is believed to involve the drug's properties as a **motilin receptor agonist**, which may affect the development or function of the pyloric sphincter. *Nifedipine* - **Nifedipine** is a calcium channel blocker primarily used for cardiovascular conditions like hypertension and angina. - It works by relaxing smooth muscles and is not linked to the development of **pyloric stenosis**. *Vancomycin* - **Vancomycin** is an antibiotic used for severe bacterial infections, particularly against Gram-positive bacteria. - It is not associated with the development of **hypertrophic pyloric stenosis**. *Phenylpropanolamine* - **Phenylpropanolamine** is a sympathomimetic drug previously used as a decongestant and anorectic. - It primarily affects alpha-adrenergic receptors and has no established link to **pyloric stenosis**.
Question 7: A patient with diabetic gastroparesis is treated with erythromycin primarily due to its ability to:
- A. Increase gastric motility
- B. Decrease gastric motility
- C. Bind to motilin receptors (Correct Answer)
- D. Act as a motilin analogue
Explanation: ***Bind to motilin receptors*** - Erythromycin acts as a **motilin receptor agonist**, mimicking the action of the endogenous hormone motilin, which stimulates gastrointestinal motility. - This binding leads to increased **gastric contractions** and improved gastric emptying, addressing the primary problem in gastroparesis. *Increase gastric motility* - While erythromycin *does* increase gastric motility, this option describes the **effect** rather than the primary mechanism of action (binding to motilin receptors). - Understanding the receptor binding is crucial for grasping why erythromycin is effective in this context. *Decrease gastric motility* - Decreasing gastric motility would **worsen** diabetic gastroparesis, a condition already characterized by delayed gastric emptying. - Erythromycin's therapeutic effect is the exact opposite of decreasing motility. *Act as a motilin analogue* - Erythromycin is not a direct motilin analogue in terms of its chemical structure, but it **mimics motilin's effects** by binding to its receptors. - The precise mechanism is its binding to the receptors, rather than being classified as a structural analogue.
Question 8: Which extra-intestinal symptom of inflammatory bowel disease worsens with exacerbation of disease activity?
- A. Primary sclerosing cholangitis
- B. Uveitis
- C. Arthritis (Correct Answer)
- D. Erythema nodosum
Explanation: ***Arthritis*** - **Peripheral arthritis** associated with inflammatory bowel disease (IBD) often **worsens with intestinal disease exacerbations** and improves with resolution of flares [1]. - This type of arthritis typically affects larger joints and is **non-deforming and asymmetric**. *Erythema nodosum* - **Erythema nodosum**, a skin manifestation, is generally **correlated with IBD activity** and usually improves as the bowel disease is treated [1]. - It presents as **tender, red nodules** on the shins and is not consistently one of the symptoms that *worsens* with exacerbation, but rather is *present* during active disease. *Primary sclerosing cholangitis* - **Primary sclerosing cholangitis (PSC)** is a chronic liver condition that is **associated with IBD**, particularly ulcerative colitis. - However, the progression of PSC is largely **independent of the intestinal disease activity** and does not necessarily worsen during IBD exacerbations. *Uveitis* - **Uveitis**, an inflammation of the eye's middle layer, is an extra-intestinal manifestation of IBD that can occur **independently of intestinal disease activity**. - It does not consistently worsen during IBD exacerbations and may require separate focused treatment.
Question 9: What is the MOST COMMON side effect of vagal nerve stimulation?
- A. nausea
- B. coughing
- C. voice changes (Correct Answer)
- D. throat discomfort
Explanation: ***voice changes*** - **Voice changes**, such as **hoarseness** or dysphonia, are the most frequently reported side effect due to the proximity of the stimulator to the **recurrent laryngeal nerve** [1]. - These changes often occur during stimulation and can be managed by adjusting the device settings. *coughing* - While **coughing** can occur, it is a less common side effect compared to voice changes. - It results from irritation of the **laryngeal or pharyngeal branches** of the vagus nerve. *nausea* - **Nausea** is a less common side effect and typically occurs due to activation of the **gastrointestinal afferent fibers** of the vagus nerve [2]. - It usually resolves with adjustment of stimulation parameters or over time. *throat discomfort* - **Throat discomfort** or pain can occur, but it is less frequent than voice changes and may be associated with the surgical implantation site or local irritation from the lead. - It is distinct from the functional changes in voice caused by direct nerve stimulation.
Question 10: A patient presents with difficulty with swallowing liquids but not solids. The best investigation to make a diagnosis is
- A. Endoscopy
- B. Endoscopic ultrasound
- C. Manometry (Correct Answer)
- D. PET CT
Explanation: ***Manometry*** - **Esophageal manometry** measures the pressure and coordination of muscle contractions in the esophagus, which is crucial for diagnosing motility disorders like **achalasia** [1] or **esophageal spasm** [2] that can cause difficulty swallowing liquids. - The symptom of difficulty swallowing liquids but not solids (**paradoxical dysphagia**) is characteristic of a primary esophageal motility disorder rather than a structural obstruction [1]. *Endoscopy* - **Endoscopy** is primarily used to visualize the esophagus and stomach for structural abnormalities such as **strictures**, **tumors**, or **inflammation** [1]. - While it can rule out structural causes, it is less effective for diagnosing purely functional or motility disorders [1]. *Endoscopic ultrasound* - **Endoscopic ultrasound (EUS)** provides detailed imaging of the esophageal wall and surrounding structures, helping to stage cancers or identify extrinsic compression. - It is not the primary investigation for assessing **esophageal motility**. *PET CT* - **PET CT** is primarily used in oncology for **cancer staging**, recurrence detection, and assessing metabolic activity of lesions. - It has limited utility in the initial diagnosis of a **swallowing disorder**, especially one indicating a motility issue.
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