An alert 21-year-old male stabbed in the epigastrium can only speak in short sentences and has JVD. VS 108/94, P 120, R 24, SpO2 88%. You should suspect?

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The key idea is recognizing cardiac tamponade from penetrating trauma. Jugular venous distention shows elevated venous pressure as the right side of the heart is compressed by fluid in the pericardial sac, preventing normal filling. The markedly narrowed pulse pressure (systolic 108, diastolic 94) points to reduced stroke volume and cardiac output, while tachycardia and hypoxemia reflect compensatory shock. An epigastric stab can pierce the heart or pericardium, making tamponade a likely cause. While tension pneumothorax can also cause JVD, it usually presents with obvious chest trauma signs, unilateral decreased breath sounds, and hyperresonance — not described here. Myocardial contusion or pure hypovolemic shock don’t typically produce JVD in the same way, or the same pulse-pressure pattern. So this presentation most strongly indicates pericardial tamponade.