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Difficulty: HardCardiovascular System

Match each jugular venous pulse (JVP) waveform abnormality with the cardiac pathology it most specifically represents.

  • Intermittent cannon 'a' wavesComplete (third-degree) atrioventricular block
  • Large, prominent 'v' waves (c-v waves)Severe tricuspid regurgitation
  • Prominent 'x' descent with an absent or blunted 'y' descentCardiac tamponade
  • Rapid, steep 'y' descent (Friedreich's sign)Constrictive pericarditis
  • Prominent 'a' waves with a slow, prolonged 'y' descentTricuspid stenosis

Answer

Intermittent cannon 'a' waves match with Complete atrioventricular block; Large 'v' waves match with Severe tricuspid regurgitation; Prominent 'x' with absent 'y' descent matches with Cardiac tamponade; Rapid 'y' descent matches with Constrictive pericarditis; and Prominent 'a' waves with slow 'y' descent match with Tricuspid stenosis.
The JVP waveform directly reflects right-sided cardiac hemodynamics. The 'a' wave corresponds to atrial contraction, the 'v' wave to venous filling against a closed tricuspid valve, and the 'y' descent to early passive right ventricular filling. Specific pathologies disrupt these physiological phases to produce characteristic waveform alterations.

Step-by-Step Solution

1
Analyze the 'a' wave abnormalities
Intermittent cannon 'a' waves are matched with AV dissociation (complete heart block), while prominent, regular 'a' waves are matched with obstruction to right atrial emptying (tricuspid stenosis).
The 'a' wave represents right atrial contraction. Contraction against a closed valve produces a massive ('cannon') wave, whereas contraction against a stenotic valve produces a consistently prominent wave.
2
Analyze the 'v' wave abnormalities
Large, prominent 'v' waves are matched with severe tricuspid regurgitation.
The 'v' wave represents venous filling of the right atrium during ventricular systole. Regurgitant flow significantly augments this wave, often merging it with the 'c' wave.
3
Differentiate the 'y' descent abnormalities in pericardial diseases
An absent or blunted 'y' descent is matched with cardiac tamponade, while a rapid, steep 'y' descent is matched with constrictive pericarditis.
The 'y' descent represents early passive right ventricular filling. Tamponade restricts filling throughout diastole (blunting the 'y' descent), while constriction allows rapid early filling before an abrupt halt (steep 'y' descent).

Key Concept

Jugular venous pulse (JVP) waveform interpretation and hemodynamic correlation
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Topics

Cardiovascular System

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