Medical Science 2022 Paper I 50 marks Describe

Q6

(a) (i) Describe in brief the pathogenesis and histopathological features of rheumatic heart disease. (10 marks) (ii) Enumerate two important causes of cirrhosis. Describe the key histopathological features of cirrhosis. (10 marks) (b) State the therapeutic indications, drug interactions and side effects of the following drugs: (i) Celecoxib (ii) Chloroquine (5+5=10 marks) (c) (i) What is Giardia lamblia? Write the manifestations of the disease produced by infection with Giardia and give its laboratory diagnosis. (10 marks) (ii) What are the different dengue viruses? Give the pathogenesis of the infections by them. How is the laboratory diagnosis done in a case of dengue haemorrhagic fever? (10 marks)

हिंदी में प्रश्न पढ़ें

(a) (i) रूमेटी हृदय रोग के विकृतिजनन तथा उतकविकृति विशेषताओं का संक्षेप में वर्णन कीजिए। (10) (ii) सिरोसिस के दो महत्वपूर्ण कारण गिनाइए। सिरोसिस की मुख्य उतकविकृति विशेषताओं का वर्णन कीजिए। (10) (b) निम्नलिखित दवाओं के चिकित्सार्थ संकेतों, औषधि अन्योन्यक्रियाओं तथा प्रतिकूल प्रभावों को उल्लिखित कीजिए : (i) सेलेकोक्सिब (ii) क्लोरोक्वीन (5+5=10) (c) (i) जियार्डिया लैम्बलिया क्या है? जियार्डिया के संक्रमण से उत्पन्न होने वाले रोग की अभिव्यक्तियों के बारे में लिखिए और उसका प्रयोगशाला में निदान कैसे किया जाता है, उल्लिखित कीजिए। (10) (ii) डेंगू के विभिन्न विषाणुज कौन-कौन से हैं? उनके संक्रमण से रोगजनन की व्याख्या कीजिए। डेंगू रक्तस्रावी ज्वर का प्रयोगशाला में निदान कैसे किया जाता है? (10)

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Directive word: Describe

This question asks you to describe. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'describe' demands systematic exposition of pathogenetic mechanisms, histopathological features, drug profiles, and parasitic disease characteristics. Allocate approximately 25% time to (a)(i) RHD pathogenesis and histopathology, 25% to (a)(ii) cirrhosis etiology and histopathology, 20% to (b) pharmacology of both drugs covering indications, interactions and adverse effects, 15% to (c)(i) Giardia morphology, clinical features and lab diagnosis, and 15% to (c)(ii) dengue serotypes, pathogenesis and DHF diagnosis. Structure each sub-part with definition/introduction, detailed body covering all command terms, and brief concluding significance.

Key points expected

  • RHD: Molecular mimicry (Streptococcus pyogenes M protein cross-reaction with cardiac myosin), Aschoff body histology (Anitschkow cells, granulomatous inflammation), valvular involvement pattern (mitral > aortic)
  • Cirrhosis: Two important causes (alcoholic liver disease and chronic viral hepatitis B/C in Indian context), histopathology showing fibrous septa, regenerative nodules, loss of lobular architecture, Mallory bodies if alcoholic
  • Celecoxib: COX-2 selective NSAID indications (rheumatoid arthritis, osteoarthritis, familial adenomatous polyposis), interactions (warfarin, ACE inhibitors, diuretics), cardiovascular and GI side effects
  • Chloroquine: Antimalarial (P. vivax/P. ovale radical cure, P. falciparum clinical cure), amebicidal, immunomodulatory uses; interactions (digoxin, antiepileptics), retinopathy, cardiomyopathy side effects
  • Giardia lamblia: Flagellated protozoan, trophozoite and cyst morphology, malabsorption diarrhea, steatorrhea, trophozoite in duodenal aspirate/cyst in stool, string test, ELISA for antigen detection
  • Dengue: Four serotypes (DEN-1 to DEN-4), antibody-dependent enhancement in DHF/DSS pathogenesis, NS1 antigen detection, IgM/IgG serology, RT-PCR, tourniquet test, thrombocytopenia and hematocrit rise as lab markers

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately describes molecular mimicry in RHD pathogenesis; correctly identifies Aschoff body components; precisely states two major cirrhosis causes relevant to India; accurately details COX-2 selectivity mechanism of celecoxib; correctly names all four dengue serotypes and explains ADE phenomenon in DHF pathogenesisBasic understanding of autoimmune mechanism in RHD but misses Anitschkow cell description; identifies cirrhosis causes but one may be less relevant; knows celecoxib is NSAID but COX selectivity unclear; knows dengue has multiple types but serotype names or ADE mechanism vagueConfuses RHD with rheumatic arthritis pathogenesis; describes cirrhosis histology as 'scarring' without architectural details; conflates celecoxib with non-selective NSAIDs; states dengue is 'viral fever' without serotype differentiation or pathogenesis
Clinical correlation20%10Links RHD to Carey-Coombs murmur and Indian rheumatic fever prevalence; connects alcoholic cirrhosis to India-specific patterns; relates celecoxib cardiovascular risk to VIGOR trial outcomes; correlates chloroquine retinopathy with cumulative dose monitoring; connects Giardia to traveler's diarrhea and daycare outbreaks; links dengue serotype-specific immunity to Indian epidemic patternsMentions clinical presentations superficially without Indian epidemiological context; states drug side effects without risk stratification; describes Giardia and dengue symptoms without outbreak relevanceNo clinical correlation provided; purely theoretical descriptions without patient-oriented outcomes or epidemiological significance
Diagram / pathway20%10Draws labeled Aschoff body diagram showing Anitschkow cells and caterpillar cells; sketches cirrhotic liver with fibrous septa and nodules; illustrates COX-2 selective inhibition pathway; depicts Giardia trophozoite with ventral sucking disc and flagella; draws dengue pathogenesis flowchart showing ADE and cytokine storm mechanismAttempts diagrams but labels incomplete or anatomical orientation incorrect; describes pathways in text without visual representation; one or two adequate diagrams for high-mark sub-parts onlyNo diagrams despite clear histopathological and morphological requirements; purely textual description of structures that warrant illustration
Differential / staging15%7.5Differentiates RHD from infective endocarditis and congenital heart disease; distinguishes micronodular versus macronodular cirrhosis; differentiates celecoxib from traditional NSAIDs regarding COX selectivity; distinguishes Giardia from other protozoal causes of diarrhea (Entamoeba, Cryptosporidium); differentiates dengue fever grades I-IV per WHO classification and distinguishes from chikungunya, malariaMentions differentials without elaborating distinguishing features; states staging systems without criteria; superficial comparison of drug classesNo differential diagnosis provided; confuses conditions (e.g., RHD with degenerative valve disease); no awareness of disease classification or severity grading
Management / public-health angle20%10Mentions secondary prophylaxis with benzathine penicillin for RHD in India; discusses hepatitis B vaccination for cirrhosis prevention; notes celecoxib cardiovascular risk black box warning and PPI co-prescription; emphasizes chloroquine ophthalmological screening; discusses metronidazole/tinidazole for giardiasis and water sanitation; outlines dengue NS1 rapid test for early diagnosis, fluid resuscitation protocols, and vector control strategies relevant to Indian urban settingsStates treatment options without prioritization or public health context; mentions prevention superficially; drug management described without monitoring protocolsNo management or prevention strategies mentioned; purely descriptive pathology without clinical application or population health relevance

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