Pharmacotherapy for Allergic Rhinitis — MCQs
What is an atypical side effect of montelukast?
All of the following statements are TRUE about second generation antihistaminic agents EXCEPT:
Partial closure of the nostrils is done as management in
A 30-year-old woman with a history of allergic rhinitis presents with bilateral watery nasal discharge and itchy eyes. What is the most appropriate first-line treatment?
How do antihistamines help in allergic rhinitis?
What is the most likely finding in the CT image of the left maxillary sinus in a patient with a history of allergic rhinitis?
Assertion: Nasal polyps are commonly associated with aspirin-exacerbated respiratory disease (AERD). Reason: Aspirin directly causes nasal polyp formation in all patients with AERD.
In which condition is Young's operation performed?
Which of the following are early mediators of allergic rhinitis?
Which of the following preformed toxins is involved in the mechanism of allergic rhinitis?
Pharmacotherapy for Allergic Rhinitis Indian Medical PG Practice Questions and MCQs
Question 1: What is an atypical side effect of montelukast?
- A. Goodpasture syndrome
- B. Membranous glomerulonephritis
- C. Bronchial asthma
- D. Churg-Strauss syndrome (Correct Answer)
Explanation: ***Churg-Strauss syndrome*** - The apparent development of **Churg-Strauss syndrome** (eosinophilic granulomatosis with polyangiitis) has been reported in patients treated with montelukast, although it is believed to be related more to the unmasking of the disease rather than a direct drug effect. - This typically occurs when **corticosteroids** are tapered or withdrawn as montelukast takes over, revealing the underlying vasculitis. *Goodpasture syndrome* - **Goodpasture syndrome** is an autoimmune disease causing rapidly progressive glomerulonephritis and pulmonary hemorrhage, characterized by anti-glomerular basement membrane (GBM) antibodies. - There is no established association between montelukast use and the development of Goodpasture syndrome. *Membranous glomerulonephritis* - **Membranous glomerulonephritis** is a common cause of nephrotic syndrome, characterized by immune complex deposition on the glomerular basement membrane. - This condition is not typically linked to the use of montelukast. *Bronchial asthma* - **Bronchial asthma** is the condition montelukast is used to treat, acting as a leukotriene receptor antagonist to reduce inflammation and bronchoconstriction. - It is a primary indication for the drug, not a side effect.
Question 2: All of the following statements are TRUE about second generation antihistaminic agents EXCEPT:
- A. These may possess additional antiallergic mechanisms
- B. These do not impair psychomotor performance
- C. These lack anticholinergic actions
- D. These possess high anti-motion sickness activity (Correct Answer)
Explanation: ***These possess high anti-motion sickness activity*** - Second-generation antihistamines have **poor penetration** into the central nervous system (CNS), making them ineffective for treating **motion sickness**. - **First-generation antihistamines**, which readily cross the blood-brain barrier and have **anticholinergic activity**, are typically used for motion sickness. *These may possess additional antiallergic mechanisms* - Many second-generation antihistamines, such as **cetirizine** and **loratadine**, have additional anti-inflammatory and **antiallergic properties** beyond H1 receptor blockade. - These mechanisms can include inhibiting the release of inflammatory mediators and **stabilizing mast cells**. *These do not impair psychomotor performance* - Second-generation antihistamines are **non-sedating** because they have limited ability to cross the **blood-brain barrier** and thus do not significantly affect CNS function. - This characteristic makes them suitable for use without causing **drowsiness** or impairing activities like driving. *These lack anticholinergic actions* - Unlike first-generation antihistamines, second-generation agents have **minimal to no affinity** for muscarinic acetylcholine receptors. - This lack of **anticholinergic activity** means they do not cause side effects such as **dry mouth**, blurred vision, or urinary retention.
Question 3: Partial closure of the nostrils is done as management in
- A. Vasomotor rhinitis
- B. Allergic rhinitis
- C. Atrophic rhinitis (Correct Answer)
- D. Occupational rhinitis
Explanation: ***Atrophic rhinitis*** - Partial closure of the nostrils (e.g., using **Young's operation**) is a surgical management technique for **atrophic rhinitis** to reduce the cross-sectional area of the nasal cavity. - This procedure helps to decrease the drying effect of airflow, improve the sensation of passage of air, and alleviate symptoms like **crusting** and **fetor**. *Vasomotor rhinitis* - This condition is characterized by **nasal-autonomic dysregulation**, leading to symptoms like **rhinorrhea** and **congestion** without an allergic cause. - Management typically involves nasal sprays (antihistamines, corticosteroids) or anticholinergics, not surgical reduction of nostril size. *Allergic rhinitis* - Triggered by **allergens**, causing an inflammatory response in the nasal lining with symptoms such as **sneezing**, **itching**, and **rhinorrhea**. - Management focuses on **allergen avoidance**, antihistamines, intranasal corticosteroids, and immunotherapy. *Occupational rhinitis* - Caused by **irritants or sensitizers** in the workplace, leading to nasal symptoms. - The primary management involves **identifying and removing the offending agent** or improving ventilation, not surgical manipulation of nostril size.
Question 4: A 30-year-old woman with a history of allergic rhinitis presents with bilateral watery nasal discharge and itchy eyes. What is the most appropriate first-line treatment?
- A. Nasal saline irrigation
- B. Antibiotics
- C. Oral antihistamine
- D. Intranasal corticosteroids (Correct Answer)
Explanation: **Intranasal corticosteroids** - **Intranasal corticosteroids** are considered the **first-line treatment** for allergic rhinitis due to their broad anti-inflammatory effects on nasal mucosa [1]. - They effectively reduce symptoms such as **nasal congestion**, **rhinorrhea**, **sneezing**, and **itching** [1]. *Nasal saline irrigation* - **Nasal saline irrigation** can help clear irritants and mucus from the nasal passages, providing symptomatic relief. - However, it is primarily an **adjunctive therapy** and not the most potent first-line treatment for managing moderate to severe allergic rhinitis symptoms alone. *Antibiotics* - **Antibiotics** are used to treat bacterial infections, which are not indicated in this case as the symptoms (watery discharge, itchy eyes) are classic for **allergic rhinitis**, not a bacterial infection. - Unnecessary antibiotic use contributes to **antibiotic resistance** and provides no benefit for allergic conditions. *Oral antihistamine* - **Oral antihistamines** are effective for relieving sneezing, itching, and rhinorrhea in allergic rhinitis [1]. - While useful, intranasal corticosteroids generally offer **superior efficacy**, particularly for nasal congestion, and are often preferred as initial monotherapy for persistent symptoms [1].
Question 5: How do antihistamines help in allergic rhinitis?
- A. inhibit prostaglandin synthesis to relieve itching.
- B. block histamine receptors to reduce symptoms. (Correct Answer)
- C. reduce inflammation by blocking leukotrienes.
- D. prevent the release of mast cell mediators.
Explanation: **Correct Answer: Block histamine receptors to reduce symptoms.** - Antihistamines work by competitively binding to **histamine H1 receptors**, preventing histamine from exerting its effects. - This action directly reduces symptoms such as **sneezing**, **itching**, and **rhinorrhea** (runny nose) associated with allergic reactions. - They act after histamine has been released by blocking its receptors on target tissues. *Incorrect: Inhibit prostaglandin synthesis to relieve itching.* - This mechanism of action is characteristic of **NSAIDs (non-steroidal anti-inflammatory drugs)**, which primarily target pain and inflammation, not the histamine-mediated symptoms of allergic rhinitis. - While prostaglandins can contribute to inflammation, antihistamines do not act on their synthesis. *Incorrect: Reduce inflammation by blocking leukotrienes.* - This mechanism describes the action of **leukotriene receptor antagonists** (e.g., Montelukast), which are used in asthma and allergic rhinitis but are distinct from antihistamines. - Leukotrienes are potent inflammatory mediators, and blocking them helps reduce inflammation and bronchoconstriction. *Incorrect: Prevent the release of mast cell mediators.* - This is the mechanism of **mast cell stabilizers** (e.g., cromolyn sodium), which prevent the degranulation of mast cells and the subsequent release of histamine and other inflammatory mediators. - Antihistamines act after histamine has already been released, not before.
Question 6: What is the most likely finding in the CT image of the left maxillary sinus in a patient with a history of allergic rhinitis?
- A. Ground-glass opacity (Correct Answer)
- B. Honeycomb appearance
- C. Onion peel appearance
- D. Double density
Explanation: ***Ground-glass opacity*** - This image shows diffuse opacification of the left maxillary sinus with a characteristic **ground-glass appearance**, which is often associated with allergic fungal rhinosinusitis (AFRS), a condition that can complicate allergic rhinitis. - The patient's history of **allergic rhinitis** makes AFRS a strong consideration, and the CT finding of ground-glass opacity within the sinus lumen is a classic imaging feature of this condition, representing fungal elements and mucin. *Honeycomb appearance* - A **honeycomb appearance** on CT is typically seen in the lungs and indicates **pulmonary fibrosis**, characterized by clustered cystic airspaces with thickened walls. - This finding is not associated with paranasal sinus pathology, especially not with allergic rhinitis or its common complications. *Onion peel appearance* - The **onion peel appearance** on imaging refers to periosteal reaction with multiple concentric layers of new bone formation. - This is a hallmark feature of conditions like **Ewing sarcoma** and chronic osteomyelitis, primarily affecting bone, not the soft tissue or mucosal lining of a sinus in the context of allergic rhinitis. *Double density* - **Double density** is a term primarily used in echocardiography to describe specific findings related to left atrial enlargement, or occasionally in chest radiography where it might represent superimposed densities. - This term does not describe a finding relevant to paranasal sinus pathology on CT imaging.
Question 7: Assertion: Nasal polyps are commonly associated with aspirin-exacerbated respiratory disease (AERD). Reason: Aspirin directly causes nasal polyp formation in all patients with AERD.
- A. Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
- B. Both Assertion and Reason are false.
- C. Assertion is true, but Reason is false. (Correct Answer)
- D. Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
Explanation: ***Assertion is true, but Reason is false.*** - The **assertion is correct** because nasal polyps are a hallmark feature of **aspirin-exacerbated respiratory disease (AERD)**, also known as **Samter's Triad** (asthma, aspirin sensitivity, chronic rhinosinusitis with nasal polyposis). - The **reason is false** because aspirin does not directly *cause* nasal polyp formation. Instead, aspirin triggers a severe inflammatory reaction in predisposed individuals through **COX-1 inhibition**, leading to an imbalance in **eicosanoid metabolism** with overproduction of **pro-inflammatory leukotrienes (LTC4, LTD4, LTE4)**. - Nasal polyps in AERD result from **chronic eosinophilic inflammation** and underlying mucosal disease, not direct causation by aspirin. *Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.* - This is incorrect because the reason is fundamentally false. - Aspirin does not directly cause polyp formation; it exacerbates pre-existing inflammatory conditions in susceptible individuals. *Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.* - This is incorrect because the reason itself is false, not merely an incorrect explanation. - The pathophysiology involves aspirin triggering inflammation in predisposed patients, not causing the polyps directly. *Both Assertion and Reason are false.* - This is incorrect because the assertion is medically accurate. - Nasal polyps are indeed commonly associated with AERD and represent one component of the classic **Samter's Triad**.
Question 8: In which condition is Young's operation performed?
- A. Allergic rhinitis
- B. Vasomotor rhinitis
- C. Lupus vulgaris
- D. Atrophic rhinitis (Correct Answer)
Explanation: ***Atrophic rhinitis*** - **Young's operation** is a surgical procedure specifically designed to treat severe cases of **atrophic rhinitis**, aiming to narrow the nasal cavity and promote mucosal regeneration. - Involves **closing the nostrils temporarily** for several months to allow healing and reduce crusting and foul odor associated with the condition. *Allergic rhinitis* - This condition is managed primarily with **antihistamines**, **nasal corticosteroids**, and allergen avoidance, not surgical methods like Young's operation. - It is an **inflammatory response** to allergens, causing sneezing, itching, and rhinorrhea, which is distinct from the mucosal atrophy seen in atrophic rhinitis. *Vasomotor rhinitis* - Vasomotor rhinitis is characterized by **non-allergic triggers** like temperature changes or irritants, leading to nasal congestion and rhinorrhea. - Treatment typically involves **topical nasal sprays** (e.g., ipratropium bromide) or lifestyle modifications, not **Young's operation**. *Lupus vulgaris* - Lupus vulgaris is a form of **cutaneous tuberculosis** affecting the skin, primarily treated with **anti-tubercular drugs**, not a nasal surgical procedure. - It presents as chronic, progressive skin lesions and is unrelated to nasal cavity disorders.
Question 9: Which of the following are early mediators of allergic rhinitis?
- A. Leukotrienes
- B. Interleukin-4
- C. Interleukin-5
- D. Platelet-activating factor and bradykinin (Correct Answer)
Explanation: ### Explanation Allergic rhinitis is a Type I hypersensitivity reaction occurring in two distinct phases: the **Early Phase** (within minutes) and the **Late Phase** (4–8 hours later). **Why Option D is Correct:** The early phase is triggered when an allergen cross-links IgE antibodies on the surface of **mast cells**, leading to immediate degranulation. This releases **pre-formed mediators** and rapidly synthesized lipid mediators. * **Histamine** is the primary mediator. * **Platelet-activating factor (PAF), Bradykinin, and Prostaglandin D2** are also released during this immediate window, causing vasodilation, increased vascular permeability (edema), and stimulation of sensory nerves (itching/sneezing). **Why Other Options are Incorrect:** * **A. Leukotrienes:** While Cysteinyl Leukotrienes (CysLTs) are produced during the early phase, they are most characteristic of the transition to and maintenance of the **Late Phase** response, contributing significantly to prolonged nasal congestion. * **B & C. Interleukin-4 and Interleukin-5:** These are **cytokines** produced by Th2 lymphocytes. They are involved in the **Late Phase** response. IL-4 promotes IgE isotype switching, while IL-5 is the primary factor for **eosinophil** recruitment and activation. **NEET-PG High-Yield Pearls:** 1. **Early Phase (Minutes):** Mediated by Mast cells. Key symptoms: Sneezing, itching, rhinorrhea. Key mediator: Histamine. 2. **Late Phase (Hours):** Mediated by Eosinophils, Basophils, and Th2 cells. Key symptom: Nasal congestion. 3. **Gold Standard Diagnosis:** Skin Prick Test (detects specific IgE). 4. **Pharmacology Link:** Antihistamines work best on early-phase symptoms (itch/sneeze), while Intranasal Steroids are the most effective treatment for late-phase symptoms (congestion) because they inhibit cytokine release.
Question 10: Which of the following preformed toxins is involved in the mechanism of allergic rhinitis?
- A. Histamine (Correct Answer)
- B. Leukotriene
- C. TXA2
- D. PGD2
Explanation: Allergic rhinitis is a **Type I Hypersensitivity reaction** mediated by IgE antibodies. When an allergen cross-links IgE on the surface of mast cells, it triggers **degranulation**, releasing two types of chemical mediators: **Preformed mediators** (stored in granules) and **Newly synthesized mediators** (produced after activation). ### Why Histamine is Correct **Histamine** is the primary **preformed mediator** stored in the granules of mast cells and basophils. Upon degranulation, it is released immediately (within minutes), causing the "Early Phase" symptoms of allergic rhinitis: vasodilation, increased capillary permeability (edema/nasal block), and stimulation of sensory nerves (itching/sneezing). ### Why Other Options are Incorrect * **Leukotrienes (B):** These are **newly synthesized** mediators derived from arachidonic acid via the lipoxygenase pathway. While potent (causing mucus secretion and congestion), they are produced *after* mast cell activation and are not pre-stored. * **TXA2 (Thromboxane A2) (C):** This is a product of the cyclooxygenase pathway primarily involved in platelet aggregation and vasoconstriction; it plays a minimal role in the pathophysiology of allergic rhinitis. * **PGD2 (Prostaglandin D2) (D):** Like leukotrienes, PGD2 is a **newly synthesized** mediator produced via the cyclooxygenase pathway. It contributes to late-phase inflammation but is not preformed. ### NEET-PG High-Yield Pearls * **Early Phase Response:** Mediated by **Histamine** (Preformed). Occurs within minutes. * **Late Phase Response:** Mediated by **Leukotrienes, PGD2, and Cytokines**. Occurs 4–8 hours later; characterized by eosinophil infiltration. * **Drug of Choice:** Intranasal corticosteroids are the most effective maintenance therapy for allergic rhinitis. * **Gold Standard Test:** Skin Prick Test (SPT) is used to identify specific allergens.
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