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Difficulty: EasyCardiovascular System

Match each classic peripheral arterial pulse abnormality with its most commonly associated cardiovascular pathology.

  • Pulsus paradoxus (>10 mm Hg drop in systolic blood pressure during inspiration)Cardiac tamponade
  • Pulsus parvus et tardus (Weak and delayed pulse upstroke)Severe aortic stenosis
  • Water-hammer pulse (Bounding, rapidly rising and collapsing pulse)Severe aortic regurgitation
  • Pulsus alternans (Alternating amplitude of pulse waves despite a regular rhythm)Advanced left ventricular systolic dysfunction

Answer

Pulsus paradoxus matches Cardiac tamponade; Pulsus parvus et tardus matches Severe aortic stenosis; Water-hammer pulse matches Severe aortic regurgitation; Pulsus alternans matches Advanced left ventricular systolic dysfunction.
Each peripheral pulse abnormality has a specific hemodynamic mechanism linking it to a primary cardiac condition, such as fixed outflow obstruction causing parvus et tardus, or ventricular interdependence causing pulsus paradoxus.

Step-by-Step Solution

1
Analyze the definition of pulsus paradoxus.
It describes an exaggerated drop in systolic blood pressure with inspiration.
Recognizing the physiological basis points to conditions with impaired right ventricular expansion, which pushes the septum into the left ventricle, classic for cardiac tamponade.
2
Analyze pulsus parvus et tardus.
It describes a weak and delayed pulse.
This is caused by a fixed mechanical obstruction to left ventricular outflow, characteristic of severe aortic stenosis.
3
Analyze water-hammer pulse.
It is a bounding pulse with rapid rise and fall.
This results from a widened pulse pressure and rapid runoff of blood back into the left ventricle, pathognomonic for severe aortic regurgitation.
4
Analyze pulsus alternans.
It features alternating strong and weak beats.
This indicates alternating left ventricular contractile force, which is a hallmark of severe left ventricular systolic failure.

Key Concept

Specific peripheral pulse abnormalities provide critical diagnostic clues that directly correlate with distinct structural and functional cardiac pathologies.
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Topics

Cardiovascular System

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