Friction rub is most likely heard in which condition?

Friction rub is most likely heard in which condition?

• A. Pleural effusion
• B. Myocardial infarction
• C. Pneumothorax
• D. Pericarditis

Answer: (D)

Friction rub reflects inflammation of serous membranes rubbing against each other, most characteristically the inflamed pericardial surfaces. This sound is a high‑pitched, scratchy murmur heard best at the left lower part of the sternum when the patient leans forward, often audible during both systole and diastole as the heart moves against inflamed pericardium. This presentation points to acute pericarditis, where the pericardial layers are inflamed and slide against one another with each heartbeat. Other conditions can create friction-like sounds, but they don’t fit this pattern as well. A pleural friction rub from pleuritis is tied to breathing and is best heard along the chest wall with respiration, not specifically tied to the cardiac cycle. Myocardial infarction itself doesn’t produce a friction rub, though it can be associated with pericarditis in some cases. A pneumothorax changes breath sounds and resonance rather than producing the classic pericardial rubbing sound.

Friction rub reflects inflammation of serous membranes rubbing against each other, most characteristically the inflamed pericardial surfaces. This sound is a high‑pitched, scratchy murmur heard best at the left lower part of the sternum when the patient leans forward, often audible during both systole and diastole as the heart moves against inflamed pericardium. This presentation points to acute pericarditis, where the pericardial layers are inflamed and slide against one another with each heartbeat.

Other conditions can create friction-like sounds, but they don’t fit this pattern as well. A pleural friction rub from pleuritis is tied to breathing and is best heard along the chest wall with respiration, not specifically tied to the cardiac cycle. Myocardial infarction itself doesn’t produce a friction rub, though it can be associated with pericarditis in some cases. A pneumothorax changes breath sounds and resonance rather than producing the classic pericardial rubbing sound.