50 Commonly Confused Topics in UPSC CMS: The Pairs That Always Appear as Options

Cardiology Pairs#

STEMI vs Pericarditis: STEMI = convex ST elevation, reciprocal changes, no PR depression. Pericarditis = concave ST elevation, PR depression, no reciprocal changes.

Stable Angina vs MI: Stable angina = exertional, relieved by rest/NTG, no enzyme rise. MI = rest pain, prolonged, enzyme rise.

Atrial Fibrillation vs Atrial Flutter: AF = irregularly irregular, no P waves, variable ventricular response. AFlutter = regular/sawtooth, flutter waves, usually 2:1 or 3:1 block.

Medicine Pairs#

RA vs SLE: RA = symmetric small joint, morning stiffness, rheumatoid factor, CCP. SLE = malar rash, ANA positive, dsDNA specific, multi-system.

Addisons vs Cushings: Addison = hypocortisolism, hyperpigmentation, hypotension. Cushing = hypercortisolism, central obesity, moon face, buffalo hump.

Microbiology Pairs#

Typhoid vs Paratyphoid: S. typhi = Widal positive, rose spots, ileal ulcers. S. paratyphi = milder disease, similar presentation.

Surgery Pairs#

Appendicitis vs Mesenteric Adenitis: Appendicitis = McBurney point tenderness, Rovsing sign, leucocytosis. Mesenteric adenitis = children, recent viral illness, diffuse pain.