Xerostomia — MCQs
All are true about Sjogren syndrome except
"Xerostomia" is seen in all of the following EXCEPT in
Which of the following drugs is least likely to cause sicca syndrome?
In which of the following conditions oral screen should\nnot be used:
A patient with rheumatoid arthritis mentions to her physician that after many years without dental problems, she has recently had seven dental caries filled. This finding suggests that she should be evaluated for which of the following diseases?
A 16-year-old patient complains of difficulty in swallowing, difficulty in talking and sometimes difficulty in breathing. On physical examination the presentation is similar to that shown in the picture. What would be the probable diagnosis?
Young's operation is done for:
All of the following statements regarding stones in the submandibular gland are true except?
Hairy leukoplakia is characterized by?
Areas of carcinoma of the oral mucosa can be identified by staining with which of the following?
Xerostomia Indian Medical PG Practice Questions and MCQs
Question 1: All are true about Sjogren syndrome except
- A. Xerostomia
- B. Lack of tear
- C. Interstitial nephritis
- D. Subcutaneous fibrosis (Correct Answer)
Explanation: ***Subcutaneous fibrosis*** - **Subcutaneous fibrosis** is typically associated with conditions like **systemic sclerosis** or **eosinophilic fasciitis**, not Sjögren's syndrome [2]. - Sjögren's syndrome primarily affects exocrine glands and other organ systems, but **fibrosis of subcutaneous tissue** is not a characteristic manifestation. *Xerostomia* - **Xerostomia**, or **dry mouth**, is a hallmark symptom of Sjögren's syndrome due to immune-mediated destruction of salivary glands. - This symptom can lead to dental caries, dysphagia, and difficulty speaking. *Lack of tear* - **Keratoconjunctivitis sicca**, or **dry eyes** (lack of tears), is another cardinal feature of Sjögren's syndrome, resulting from inflammation of the lacrimal glands [1]. - Patients often experience grittiness, foreign body sensation, and blurred vision due to insufficient tear production. *Interstitial nephritis* - **Interstitial nephritis** can occur in Sjögren's syndrome, particularly **tubulointerstitial nephritis**, which may lead to **renal tubular acidosis**. - Renal involvement, though less common than sicca symptoms, is a recognized extraglandular manifestation.
Question 2: "Xerostomia" is seen in all of the following EXCEPT in
- A. Anticholinergic drugs
- B. Oral sepsis (Correct Answer)
- C. Sjogren's syndrome
- D. Dehydration
Explanation: ***Oral sepsis*** - **Oral sepsis** typically involves infection and inflammation of the oral cavity and can lead to symptoms like pain, swelling, and pus formation, but it does not directly cause a decrease in saliva production, which is characteristic of xerostomia. - While oral sepsis can occur alongside or exacerbate other oral health issues, it is not a primary cause of **dry mouth** itself. *Anticholinergic drugs* - **Anticholinergic drugs** block the action of acetylcholine, which is a neurotransmitter involved in stimulating salivary glands. - This blockage leads to reduced saliva production, a common and well-known side effect that causes **xerostomia**. *Sjogren's syndrome* - **Sjögren's syndrome** is an autoimmune disease characterized by the immune system attacking moisture-producing glands, primarily the salivary and lacrimal (tear) glands. - This autoimmune destruction directly leads to chronic **xerostomia** (dry mouth) and dry eyes. *Dehydration* - **Dehydration** occurs when the body lacks sufficient fluid, which affects overall fluid balance, including saliva production. - Reduced fluid intake or excessive fluid loss directly decreases the volume of saliva produced, resulting in **dry mouth** or xerostomia.
Question 3: Which of the following drugs is least likely to cause sicca syndrome?
- A. Atropine
- B. Nicotine (Correct Answer)
- C. Olanzapine
- D. Clonidine
Explanation: ***Nicotine*** - **Nicotine** is a **nicotinic cholinergic receptor agonist** that acts primarily at autonomic ganglia and the neuromuscular junction. - Unlike antimuscarinic drugs, nicotine **does NOT block parasympathetic glandular secretion** and is **not associated with causing sicca syndrome**. - While nicotine has complex autonomic effects, it does **not significantly reduce salivary or lacrimal gland secretion**, making it the **least likely** among these options to cause sicca syndrome. - The question asks for the drug *least likely* to cause sicca syndrome, and nicotine's mechanism of action does not involve blocking secretory glands. *Atropine* - **Atropine** is a potent **muscarinic acetylcholine receptor antagonist** with strong anticholinergic effects. - It directly **blocks parasympathetic stimulation** of salivary and lacrimal glands, leading to marked reduction in secretions. - **Dry mouth (xerostomia) and dry eyes (xerophthalmia)** are classic and prominent side effects, making atropine one of the **most likely drugs to cause sicca syndrome**. *Olanzapine* - **Olanzapine** is an atypical antipsychotic with **moderate anticholinergic properties** due to muscarinic M1 receptor blockade. - **Dry mouth is a common side effect** occurring in 20-30% of patients taking olanzapine. - While less potent than atropine, olanzapine's anticholinergic effects make it **likely to contribute to sicca symptoms**. *Clonidine* - **Clonidine** is an **alpha-2 adrenergic agonist** that reduces sympathetic outflow centrally. - **Dry mouth (xerostomia)** is one of the **most common side effects** of clonidine, occurring in up to 40% of patients. - The mechanism involves decreased salivary gland secretion, making clonidine **highly likely to cause sicca syndrome symptoms**.
Question 4: In which of the following conditions oral screen should\nnot be used:
- A. Acute infection of tonsils and adenoids (Correct Answer)
- B. Tongue thrusting
- C. Thumb sucking
- D. Nail biting habit
Explanation: ***Acute infection of tonsils and adenoids*** - An oral screen **increases airflow restriction** and can exacerbate symptoms in patients with acute tonsil and adenoid infections. - Using an oral screen in this condition can lead to **discomfort**, **difficulty breathing**, and potentially worsen the inflammatory process. *Tongue thrusting* - Oral screens are often used as an **orthodontic appliance** to help modify or correct **tongue thrusting habits**, a parafunctional habit. - They act as a physical barrier to retrain tongue placement and swallowing patterns. *Thumb sucking* - **Oral screens** are a common appliance used to deter **thumb sucking habits** in children. - By creating a physical barrier, they help break the habit and prevent associated dental malocclusions. *Nail biting habit* - While other dental appliances might address nail biting, an **oral screen is not typically indicated** for this habit. - Nail biting is often managed through behavioral modification or other protective devices on the nails themselves.
Question 5: A patient with rheumatoid arthritis mentions to her physician that after many years without dental problems, she has recently had seven dental caries filled. This finding suggests that she should be evaluated for which of the following diseases?
- A. Sjogren's syndrome (Correct Answer)
- B. Polyarteritis nodosa
- C. Oral squamous cell carcinoma
- D. Systemic lupus erythematosus
Explanation: ***Sjogren's syndrome*** - Patients with **rheumatoid arthritis** have an increased risk of developing **secondary Sjogren's syndrome**, a chronic autoimmune disease. - The hallmark of Sjogren's syndrome is **xerostomia** (dry mouth) due to decreased salivary gland function, leading to a higher incidence of dental caries. *Polyarteritis nodosa* - This is a **necrotizing vasculitis** primarily affecting medium-sized arteries, often associated with **hepatitis B**. - It typically presents with **systemic symptoms**, skin lesions, neuropathy, hypertension, and kidney involvement, not primarily increased dental caries. *Oral squamous cell carcinoma* - It is a **malignant tumor** of the oral cavity, which can be associated with tobacco and alcohol use. - While it can cause oral discomfort and lesions, it does not directly lead to a sudden increase in **dental caries** as its primary manifestation. *Systemic lupus erythematosus* - While **rheumatoid arthritis** and **lupus** are both autoimmune diseases, **systemic lupus erythematosus** itself does not directly cause an increased incidence of dental caries. - Lupus is a multisystem autoimmune disease that can affect virtually any organ system and has a wide range of manifestations, but **dry mouth** leading to caries is more characteristic of Sjogren's syndrome.
Question 6: A 16-year-old patient complains of difficulty in swallowing, difficulty in talking and sometimes difficulty in breathing. On physical examination the presentation is similar to that shown in the picture. What would be the probable diagnosis?
- A. Ranula
- B. Lingual thyroid (Correct Answer)
- C. Enlarged adenoids
- D. Vallecular cyst
Explanation: ***Lingual thyroid*** - The image shows a **mass at the base of the tongue**, which is typical of a lingual thyroid, an ectopic thyroid tissue. - Symptoms like **difficulty swallowing (dysphagia)**, **difficulty talking (dysphonia)**, and **difficulty breathing (dyspnea)** are common with a lingual thyroid due to its obstructive nature. - Lingual thyroid results from **failure of thyroid descent** during embryological development and is the most common ectopic thyroid location. *Ranula* - A ranula is a **mucus extravasation cyst** found on the **floor of the mouth**, usually unilateral and bluish. - While it can cause speech or swallowing difficulties, its location is distinct from the mass seen at the tongue base. *Vallecular cyst* - A vallecular cyst is a **mucus retention cyst** located in the **vallecula** (between the base of tongue and epiglottis). - Can present with dysphagia and respiratory symptoms, but typically appears more **cystic and translucent** rather than solid tissue mass. - Less common in adolescents compared to lingual thyroid. *Enlarged adenoids* - Enlarged adenoids are located in the **nasopharynx** and typically cause nasal obstruction, mouth breathing, and recurrent ear infections. - They would not present as a visible mass at the base of the tongue nor cause dysphagia or dysphonia to this extent.
Question 7: Young's operation is done for:
- A. Allergic rhinitis
- B. Vasomotor rhinitis
- C. Atrophic rhinitis (Correct Answer)
- D. Antrochoanal polyp
Explanation: ***Atrophic rhinitis*** - **Young's operation** is a surgical procedure specifically designed to treat **atrophic rhinitis**. - The goal of the surgery is to narrow the nasal passages by creating a **synechia** (adhesion) to reduce airflow and improve the humidification and temperature of inspired air. *Allergic rhinitis* - Allergic rhinitis is primarily managed with **medical therapy**, including antihistamines, nasal corticosteroids, and allergen avoidance. - Surgical intervention, if considered, typically involves procedures like turbinate reduction, not Young's operation, and is less common for this condition. *Vasomotor rhinitis* - Vasomotor rhinitis is a **non-allergic, non-infectious condition** characterized by fluctuating nasal congestion and rhinorrhea, often triggered by irritants or temperature changes. - Treatment usually involves **medical management** with anticholinergics or nasal corticosteroids, and sometimes turbinate reduction, but not Young's operation. *Antrochoanal polyp* - An antrochoanal polyp is a benign growth originating in the **maxillary sinus** and extending into the choana. - The primary treatment is **surgical removal**, typically via endoscopic sinus surgery, which is distinct from Young's operation.
Question 8: All of the following statements regarding stones in the submandibular gland are true except?
- A. 80% of stones occur in the submandibular gland
- B. Majority of submandibular stones are radiolucent (Correct Answer)
- C. Stones are the most common cause of obstruction within the submandibular gland
- D. Patient presents with acute swelling in the region of the submandibular gland
Explanation: ### Explanation **1. Why the correct answer is right:** The statement "Majority of submandibular stones are radiolucent" is **false**, making it the correct choice for an "except" question. In reality, **80% of submandibular gland stones are radiopaque** (visible on X-ray). This is because submandibular saliva is highly alkaline and has a high concentration of calcium and phosphate salts, leading to dense calcification of the stones. In contrast, parotid stones are more likely to be radiolucent (only 20% are radiopaque). **2. Analysis of incorrect options:** * **Option A:** True. Approximately 80% of all salivary calculi (sialolithiasis) occur in the submandibular gland [1]. This is due to the long, upward course of Wharton’s duct and the viscous, mucin-rich nature of the saliva. * **Option C:** True. Sialolithiasis is the most common cause of salivary gland obstruction, leading to stasis and potential secondary infection (sialadenitis) [1]. * **Option D:** True. Patients typically present with "mealtime syndrome"—acute, painful swelling of the gland triggered by eating, as saliva production increases against an obstructed duct. **3. Clinical Pearls for NEET-PG:** * **Wharton’s Duct:** The most common site for stone formation. * **Composition:** Submandibular stones have higher calcium content than parotid stones. * **Imaging:** The best initial radiograph for a submandibular stone is an **Intraoral Periapical (IOPA) view** or a **Mandibular Occlusal view**. * **Management:** Small distal stones can be removed via duct incision (sialolithotomy); proximal or intraglandular stones may require gland excision [1]. * **Sialendoscopy:** The modern "gold standard" for both diagnosis and minimally invasive removal of salivary stones [1].
Question 9: Hairy leukoplakia is characterized by?
- A. Pain
- B. EBV infection (Correct Answer)
- C. No association with HIV
- D. Pre-cancerous
Explanation: **Explanation:** **Hairy Leukoplakia (HL)** is a distinctive white lesion of the oral mucosa, primarily affecting the lateral borders of the tongue. 1. **Why Option B is correct:** The condition is caused by the **Epstein-Barr Virus (EBV)**. In immunocompromised states, EBV undergoes productive replication in the squamous epithelium of the tongue, leading to the characteristic corrugated or "hairy" appearance. It is considered an opportunistic infection. 2. **Why other options are incorrect:** * **Option A:** HL is typically **asymptomatic (painless)**. Patients usually discover it incidentally or due to its texture. * **Option C:** There is a **strong association with HIV**. It is one of the most common oral manifestations of HIV/AIDS and often serves as an early clinical sign of progression to AIDS or a declining CD4 count. * **Option D:** Unlike "Oral Leukoplakia," Hairy Leukoplakia has **no malignant potential**. It is not a pre-cancerous lesion and does not require aggressive surgical excision. **High-Yield Clinical Pearls for NEET-PG:** * **Appearance:** White, non-scrapable, vertical ridges (corrugated) on the lateral margins of the tongue. * **Diagnosis:** Usually clinical; biopsy shows hyperkeratosis, acanthosis, and "balloon cells" in the upper stratum spinosum. * **Treatment:** Generally not required unless for cosmetic reasons (Acyclovir or Podophyllin can be used), but its presence mandates an immediate workup for HIV/immunodeficiency. * **Differentiating Feature:** Unlike Oral Candidiasis, Hairy Leukoplakia **cannot** be scraped off.
Question 10: Areas of carcinoma of the oral mucosa can be identified by staining with which of the following?
- A. 1% zinc chloride
- B. 2% silver nitrate
- C. Gentian violet
- D. 2% toluidine blue (Correct Answer)
Explanation: **Explanation:** **1. Why 2% Toluidine Blue is Correct:** Toluidine blue (also known as tolonium chloride) is a **vital acidophilic dye** that has a high affinity for nucleic acids. Malignant and dysplastic cells have a significantly higher DNA/RNA content and increased nuclear-to-cytoplasmic ratios compared to normal cells. When applied to the oral mucosa, the dye selectively stains these areas of high nucleic acid concentration, highlighting suspicious lesions (carcinoma in situ or invasive squamous cell carcinoma) as dark blue. This is a common chair-side screening tool used to demarcate biopsy sites. **2. Why the Other Options are Incorrect:** * **1% Zinc Chloride:** This is primarily used as an astringent or in certain chemical cautery pastes (like Mohs paste), but it has no diagnostic staining properties for malignancy. * **2% Silver Nitrate:** This is a caustic agent used for chemical cauterization of aphthous ulcers or to control minor bleeding (hemostasis). It stains tissues black but is not selective for cancer cells. * **Gentian Violet:** This is an antifungal and antiseptic dye used to treat oral candidiasis (thrush). While it stains the mucosa purple, it does not differentiate between normal and malignant cells. **3. High-Yield Clinical Pearls for NEET-PG:** * **False Positives:** Toluidine blue can also stain inflammatory lesions (like ulcers) because of the high cellular turnover; therefore, a "re-stain" after 10–14 days of anti-inflammatory treatment is often recommended. * **Lugol’s Iodine:** Another vital stain used in the oral cavity and esophagus. Normal squamous epithelium (rich in glycogen) stains brown, while **malignant cells (glycogen-poor) remain unstained.** * **Gold Standard:** Remember that while toluidine blue helps in identifying the site, the definitive diagnosis of oral cancer always requires a **histopathological examination (biopsy).**
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