Veterinary Medicine- ICAR JRF/SRF 2024

• Chronological Pathogenesis of Hepatocellular Jaundice:
• Swelling and Edema: Acute toxic, infectious, or metabolic insult triggers hepatocellular hydropic swelling and sinusoidal edema.
• Mechanical Intrahepatic Obstruction: Swollen hepatocytes compress and mechanically occlude microscopic intrahepatic bile canaliculi and ductules.
• Impaired Conjugation: Severe hepatocyte damage impairs microsomal glucuronyl transferase activity, reducing conjugation capacity.
• Elevation of Conjugated Bilirubin: Rupture of compressed bile canaliculi regurgitates conjugated bilirubin back into hepatic sinusoids and systemic circulation.
• Sequential Order: (C) $\rightarrow$ (B) $\rightarrow$ (A) $\rightarrow$ (D) (Option 4).

Correct option: (4) (C), (B), (A), (D)

• Clinical Presentation of Jaundice (Icterus): Jaundice is the hyperbilirubinemic syndrome characterized by a yellowish pigmentation of tissues with high elastin content, visible clinically as yellow discoloration of the sclera, mucous membranes, and unpigmented skin.
• Thresholds: Clinically perceptible when total serum bilirubin concentration exceeds $2.0\text{--}3.0\text{ mg/dL}$ ($34\text{--}50\ \mu\text{mol/L}$).
• Exclusions: Bluish skin signifies cyanosis; redness reflects active hyperemia/erythema; greenish discoloration is seen only with biliverdin accumulation in avian/reptilian liver disease.

Correct option: (4) Yellow discoloration of unpigmented skin

• Pathology of Chronic Cystitis: In chronic bacterial or urolithiasis-induced cystitis, continuous mechanical and chemical irritation leads to:
• Erosion and ulceration of the mucosal surface, often accompanied by mucosal polypoid hyperplasia and follicular lymphoid aggregates.
• Severe, diffuse fibrous thickening and induration of the muscular bladder wall, with dark, cloudy, turbid urine containing desquamated epithelial casts, leukocytes, and triple phosphate crystals.

Correct option: (3) Erosion of mucosal surface