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ventricular aneurysm diagnosis after MI paradoxical impulse ST elevation X-ray pulsus paradoxus UPSC CMS

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Q2 - Ventricular Aneurysm After Myocardial Infarction

Correct Answer: (c) I, II and III

What is a Ventricular Aneurysm?

A left ventricular (LV) aneurysm is a localized, thin-walled scar that bulges outward (paradoxical/dyskinetic wall motion) following a transmural (full-thickness) myocardial infarction. The infarcted muscle is replaced by fibrous scar tissue that cannot contract - instead it balloons outward during systole.

Analyzing Each Statement

Statement I - Paradoxical Impulse on Chest Wall ✅ CORRECT

  • A ventricular aneurysm causes dyskinetic (paradoxical) wall motion - the scarred segment bulges outward during systole, while the rest of the heart contracts inward.
  • On clinical examination, this is felt as a double, diffuse, or displaced apical impulse on the precordium.
  • Harrison's (22E) states: "The physical finding of greatest value is a double, diffuse, or displaced apical impulse."
  • This paradoxical pulsation is a classic bedside sign of LV aneurysm.

Statement II - Persistent ST Elevation on ECG ✅ CORRECT

  • After a normal MI, ST elevation should resolve within 2 weeks.
  • If ST elevation persists beyond 2 weeks after a STEMI, it strongly suggests ventricular aneurysm formation.
  • ECG findings include: persistent ST elevation + deep Q waves + low-amplitude T waves.
  • This pattern has a sensitivity of 38% and specificity of 84% for ventricular aneurysm (LITFL ECG Library).
  • The mechanism is transmural scar formation with incomplete reperfusion.

Statement III - Unusual Bulge from Cardiac Silhouette on X-ray ✅ CORRECT

  • On chest X-ray, a ventricular aneurysm appears as a focal lateral bulge or well-circumscribed opacity projecting beyond the regular cardiac outline (left lower heart border).
  • Radiopaedia describes it as: "focal lateral bulge arising from the left lower heart border".
  • The wall may also show thin curvilinear calcification in chronic aneurysms.
  • This is a recognizable and diagnostically helpful X-ray finding.

Statement IV - Presence of Pulsus Paradoxus ✅ INCORRECT (not associated)

  • Pulsus paradoxus is an exaggerated fall in systolic BP (>10 mmHg) during inspiration.
  • It is a classic sign of cardiac tamponade (pericardial effusion compressing the heart), or severe asthma/COPD - NOT ventricular aneurysm.
  • Ventricular aneurysm does NOT cause pericardial compression, so there is no mechanism to produce pulsus paradoxus.
  • This is a classic distractor in UPSC CMS to test whether you can differentiate aneurysm from tamponade.

Summary Table

StatementFeatureIn Ventricular Aneurysm?
IParadoxical impulse on chest wall✅ Yes - dyskinetic apex
IIPersistent ST elevation on ECG✅ Yes - after >2 weeks
IIIUnusual bulge on chest X-ray✅ Yes - focal cardiac bulge
IVPulsus paradoxus❌ No - this is a sign of tamponade

Key Memory Point for UPSC CMS

The classic triad to diagnose ventricular aneurysm after MI:
  1. Paradoxical precordial pulsation (clinical)
  2. Persistent ST elevation (ECG - beyond 2 weeks)
  3. Cardiac bulge on CXR (radiology)
Pulsus paradoxus belongs to cardiac tamponade (Beck's triad: hypotension, muffled heart sounds, JVD) - not ventricular aneurysm.
Answer = (c) I, II and III
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