Which pulsus finding is associated with cardiac tamponade?

Which pulsus finding is associated with cardiac tamponade?

• A. Pulsus alternans
• B. Pulsus tardus
• C. Pulsus parvus
• D. Pulsus paradoxus

Answer: (D)

Pulsus paradoxus is an exaggerated drop in systolic blood pressure during inspiration. In cardiac tamponade, the pericardial fluid constrains the heart so filling is limited; when you inhale, the increased venous return to the right heart shifts the interventricular septum toward the left ventricle, further reducing LV filling. This causes a larger-than-normal decrease in systolic pressure with inspiration, often greater than 10 mmHg, and presents as a weaker pulse. This finding is classic for tamponade and helps distinguish it from other conditions. Other pulsus types reflect different problems: pulsus alternans signals severe LV systolic dysfunction with beat-to-beat variation in pulse; pulsus tardus indicates a slow-carotid upstroke from aortic stenosis; pulsus parvus is a small, diminished pulse seen with various valve or vascular diseases.

Pulsus paradoxus is an exaggerated drop in systolic blood pressure during inspiration. In cardiac tamponade, the pericardial fluid constrains the heart so filling is limited; when you inhale, the increased venous return to the right heart shifts the interventricular septum toward the left ventricle, further reducing LV filling. This causes a larger-than-normal decrease in systolic pressure with inspiration, often greater than 10 mmHg, and presents as a weaker pulse. This finding is classic for tamponade and helps distinguish it from other conditions. Other pulsus types reflect different problems: pulsus alternans signals severe LV systolic dysfunction with beat-to-beat variation in pulse; pulsus tardus indicates a slow-carotid upstroke from aortic stenosis; pulsus parvus is a small, diminished pulse seen with various valve or vascular diseases.