Medical Science 2023 Paper I 50 marks Compulsory Enumerate

Q5

(a) Enumerate various classes of antihypertensive drugs. Briefly discuss the role of calcium channel blockers in the treatment of hypertension. 5+5=10 (b) (i) Describe mechanism of T-cell mediated immune response in Type IV hypersensitivity reaction. Explain it by giving example of tuberculin testing. 5 (ii) List the clinical diseases caused by typhoidal and non-typhoidal Salmonellae. Discuss the Widal test and its interpretation. 2+3=5 (c) Enumerate four disturbances of growth. Describe the mechanism of Atrophy. 5+5=10 (d) A 25-year-old male presented to emergency with history of fever, neck stiffness, headache and vomiting. On examination, patient was in altered sensorium. Neck rigidity was present. CSF examination showed cobweb formation. Microscopy showed lymphocytosis. Biochemical examination showed decreased glucose and increased protein. (i) What is the likely diagnosis? (ii) Name the special stain on CSF useful in confirmation of diagnosis and write the finding. (iii) Describe the diagnostic gross pathology of likely affected organ. 2+3+5=10 (e) Enumerate types of Blood Group Systems used for identification and paternity testing. 10

हिंदी में प्रश्न पढ़ें

(a) अतिरक्तदाब-रोधक औषधियों के विभिन्न वर्गों के नाम गिनाइए । अतिरक्तदाब के उपचार में कैल्सियम चैनल रोधकों की भूमिका की संक्षेप में व्याख्या कीजिए । 5+5=10 (b) (i) टाइप IV अतिसंवेदनशीलता अभिक्रिया में टी-कोशिकाओं द्वारा मध्यस्थ प्रतिरक्षा अनुक्रिया की यांत्रिकी का वर्णन कीजिए । ट्यूबरकुलिन टेस्टिंग के उदाहरण द्वारा इसे समझाइए । 5 (ii) टाइफॉयडल तथा नॉन-टाइफॉयडल साल्मोनेल्ले से होने वाले लाक्षणिक रोगों की सूची प्रस्तुत कीजिए । विडाल टेस्ट एवं इसके निर्वचन की व्याख्या कीजिए । 2+3=5 (c) वृद्धि से संबद्ध चार विसंबंध गिनाइए । शोष की क्रियाविधि का वर्णन कीजिए । 5+5=10 (d) एक 25-वर्षीय पुरुष आपातकालीन सेवा में आया है । उसे ज्वर है, गर्दन में अकड़न है, सिर में दर्द है और उल्टियाँ हुई हैं । जाँच करने पर उसका संवेदना तंत्र बदला हुआ सा है । ग्रीवा कठोरता का लक्षण उपस्थित है । CSF की जाँच करने पर मकड़ी के जाले जैसी रचना दिखाई दी । सूक्ष्मदर्शीय जाँच करने पर लसिकाकोशिका बहुलता है । जैव-रासायनिक जाँच करने पर ग्लूकोस का स्तर घटा हुआ है और प्रोटीन बढ़ा हुआ है । (i) संभावित निदान क्या है ? (ii) CSF के लिए प्रयुक्त उस विशेष अभिरंजन का नाम बताइए जो निदान की पुष्टि में सहायक सिद्ध होता है । उसके प्रयोग से क्या प्राप्ति होगी ? (iii) संभावित प्रभावित अंग में नैदानिक सकल उत्कबिकृति का वर्णन कीजिए । 2+3+5=10 (e) उन विभिन्न प्रकार की रक्त समूह प्रणालियों के नाम गिनाइए जिनका उपयोग व्यक्ति की पहचान करने के लिए तथा जनकता जाँच करने के लिए किया जाता है । 10

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Directive word: Enumerate

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How this answer will be evaluated

Approach

The directive 'enumerate' demands systematic listing with brief elaboration. Structure: (a) 10 marks—list 8-10 antihypertensive classes with CCB mechanism (20%); (b) 10 marks—Type IV hypersensitivity with tuberculin testing, then Salmonella diseases with Widal interpretation (20%); (c) 10 marks—four growth disturbances with atrophy mechanisms (20%); (d) 10 marks—diagnose tuberculous meningitis, identify Ziehl-Neelsen stain, describe meningeal gross pathology (20%); (e) 10 marks—enumerate blood group systems for identification and paternity (20%). Allocate equal time per part; use diagrams for pathways and gross pathology.

Key points expected

  • (a) Enumerates ≥8 antihypertensive classes (ACEI, ARBs, CCBs, thiazides, loop diuretics, beta-blockers, alpha-blockers, vasodilators, centrally acting) with CCB mechanism: L-type calcium channel blockade in vascular smooth muscle, reduced peripheral resistance
  • (b)(i) Type IV hypersensitivity: Th1 cell activation, IFN-γ release, macrophage activation, granuloma formation; tuberculin test: 48-72 hours, induration ≥10mm positive, Mantoux technique
  • (b)(ii) Typhoidal: enteric fever; non-typhoidal: gastroenteritis, bacteremia; Widal test: O and H agglutinins, rising titer ≥1:160, anamnestic response limitation
  • (c) Four growth disturbances: hypertrophy, hyperplasia, atrophy, metaplasia; atrophy mechanisms: decreased protein synthesis, increased protein degradation (ubiquitin-proteasome), autophagy, apoptosis, decreased growth factors
  • (d) Diagnosis: tuberculous meningitis; stain: Ziehl-Neelsen (acid-fast bacilli, red rods against blue background); gross pathology: thick, opaque exudate at base of brain, tubercles on meninges, hydrocephalus
  • (e) Blood group systems: ABO, Rh (D), MNSs, Kell, Duffy, Kidd, Lewis, P1PK, Hh, Xg; paternity testing: ABO, Rh, HLA, DNA fingerprinting; exclusion vs probability of paternity

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately classifies all antihypertensives with correct CCB molecular mechanism; precisely describes Th1-mediated delayed hypersensitivity with cytokine cascade; correctly identifies tuberculous meningitis with AFB staining; lists ≥8 blood group systems with paternity applicationLists most drug classes with minor mechanism errors; describes hypersensitivity with some pathway gaps; identifies meningitis but confuses stain or misses AFB morphology; lists 4-6 blood group systems with incomplete paternity explanationMajor classification errors (e.g., confuses CCB with beta-blocker mechanism); fundamental misunderstanding of Type IV hypersensitivity; wrong diagnosis (e.g., bacterial meningitis) or stain; <4 blood group systems or irrelevant systems listed
Clinical correlation20%10Links CCBs to specific clinical scenarios (elderly, isolated systolic hypertension, vasospastic angina); correlates tuberculin test with BCG vaccination status and immunocompromised interpretation; explains Widal limitations in endemic areas like India; connects blood groups to transfusion safety and forensic utilityMentions clinical uses without specific scenarios; describes tuberculin reading without BCG consideration; notes Widal but misses endemic false positives; basic blood group-clinical link without paternity specificsNo clinical context for any part; fails to mention Indian public health relevance (TB endemicity, enteric fever prevalence); blood groups listed without application
Diagram / pathway20%10Draws labeled Th1 activation pathway (APC → TCR → CD4 → IFN-γ → macrophage); illustrates CCB action on vascular smooth muscle calcium channels; sketches meningeal exudate distribution (basal predominance); includes blood group inheritance pattern diagramDescribes pathways in text without diagrams; or draws incomplete diagrams missing key labels (e.g., IFN-γ, L-type channels); mentions cobweb CSF without visual representationNo diagrams or pathway descriptions; entirely text-based despite clear visual opportunities in immunology and pathology
Differential / staging15%7.5Differentiates Type IV from I-III hypersensitivity; distinguishes typhoidal vs non-typhoidal Salmonella by clinical syndrome and host; contrasts tuberculous vs pyogenic vs cryptococcal meningitis (CSF glucose, lymphocytes vs neutrophils); stages Widal interpretation (acute vs convalescent)Basic differentiation without CSF parameter comparison; lists Salmonella diseases without clear syndrome distinction; mentions paired sera for Widal without staging detailNo differential diagnosis for meningitis case; confuses typhoidal with non-typhoidal; fails to contrast hypersensitivity types
Management / public-health angle20%10Mentions RNTCP/DOTS for TB meningitis; discusses CCB as first-line in JNC-8/India guidelines; notes typhoid vaccination (Vi polysaccharide) and safe water; emphasizes blood group screening in Indian blood banking standards; forensic DNA testing superseding serologyBrief mention of ATT for TB without regimen; generic antihypertensive advice; notes enteric fever treatment without prevention; blood group testing mentioned without standardsNo management or public health content; entirely theoretical without national program relevance

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