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Difficulty: MediumPhysical Examination Findings

Match the following distinctive cardiovascular physical examination findings with their most likely underlying pathophysiological mechanism.

  • An inspiratory decrease in systolic blood pressure greater than 10 mm HgExaggerated ventricular interdependence with bowing of the interventricular septum during inspiration
  • A paradoxical rise in jugular venous pressure during inspirationImpaired right ventricular diastolic filling due to an inelastic surrounding structure
  • A diminished and delayed carotid arterial pulse upstrokeFixed obstruction to left ventricular outflow resulting in a prolonged ejection period
  • A bounding peripheral pulse with two distinct palpable systolic peaksRapid ejection of a large stroke volume followed by rapid diastolic runoff
  • A regular pulse rhythm demonstrating alternating strong and weak beatsBeat-to-beat variations in myocardial contractility and stroke volume despite a regular rhythm

Answer

Pulsus paradoxus correlates with exaggerated ventricular interdependence; Kussmaul sign with impaired right ventricular filling; pulsus parvus et tardus with fixed left ventricular outflow obstruction; pulsus bisferiens with rapid ejection and runoff; and pulsus alternans with beat-to-beat changes in myocardial contractility.
Each cardiovascular sign has a specific and distinct underlying mechanism. Pulsus paradoxus is driven by ventricular interdependence in the setting of constrained pericardial volume. Kussmaul sign reflects impaired right-sided filling in the setting of an inelastic pericardium. Pulsus parvus et tardus is due to fixed left ventricular obstruction. Pulsus bisferiens is caused by rapid ejection and runoff. Pulsus alternans reflects beat-to-beat changes in left ventricular contractility in severe heart failure.

Step-by-Step Solution

1
Evaluate the mechanism for an inspiratory decrease in systolic blood pressure > 10 mm Hg.
This is pulsus paradoxus.
In cardiac tamponade, a fixed pericardial volume means right ventricular expansion during inspiration pushes the septum leftward, decreasing left ventricular stroke volume (exaggerated ventricular interdependence).
2
Evaluate the mechanism for a paradoxical rise in JVP during inspiration.
This is Kussmaul sign.
An inelastic structure (like constrictive pericarditis) impairs right ventricular diastolic filling, preventing the normal accommodation of inspiratory venous return.
3
Evaluate the mechanism for a diminished and delayed carotid upstroke.
This is pulsus parvus et tardus.
Severe aortic stenosis creates a fixed left ventricular outflow obstruction, which limits the amplitude and delays the peak of the arterial pulse.
4
Evaluate the mechanism for a bounding peripheral pulse with two distinct systolic peaks.
This is pulsus bisferiens.
Severe aortic regurgitation leads to a large stroke volume being quickly ejected and then rapidly leaking back into the left ventricle, creating a distinct double peak.
5
Evaluate the mechanism for alternating strong and weak peripheral pulses.
This is pulsus alternans.
In severe left ventricular systolic dysfunction, calcium cycling alternates, leading to beat-to-beat variations in myocardial contractility and stroke volume.

Key Concept

Cardiovascular physical examination signs and their pathophysiologic mechanisms
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Topics

Physical Examination Findings

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