Question
A 65-year-old lady with a history of chronic heart failure presents with progressively worsening bilateral leg swelling over a few weeks. On examination, she has marked pitting oedema up to the thighs, a markedly elevated JVP reaching the jawline, and a loud holosystolic murmur best heard at the lower left sternal border. The liver is enlarged and pulsatile.
Which alteration in the jugular venous pulse tracing is most likely?
A. Intermittent large atrial contraction waves
B. Very large systolic filling waves
C. Rise in JVP during inspiration
D. Deep systolic collapse of JVP
E. Delayed emptying wave
Answer
Very large systolic filling waves (giant V waves)
Explanation
This clinical picture strongly suggests tricuspid regurgitation (TR), particularly functional TR due to right-sided heart failure.
Key clues:
- Elevated JVP to mandible → severe right-sided pressure overload
- Pansystolic murmur at left lower sternal edge → classic for TR
- Pulsatile hepatomegaly → systolic backflow into venous system
- Bilateral oedema → systemic venous congestion
In tricuspid regurgitation, during ventricular systole, blood flows backward from the right ventricle into the right atrium, instead of forward into the pulmonary artery.
This causes:
- Marked rise in right atrial pressure during systole
- Prominent V wave in the JVP waveform → giant V waves
Why other options are wrong
- Cannon a waves → occur when atria contract against a closed tricuspid valve (AV dissociation, e.g., complete heart block)
- Kussmaul’s sign → rise in JVP during inspiration (constrictive pericarditis, restrictive cardiomyopathy)
- Prominent x descent → seen in tamponade or constrictive pericarditis, not TR
- Slow y descent → seen in tricuspid stenosis due to impaired RA emptying
Cheat Sheet (JVP Waveform – Exam Gold)
a wave → atrial contraction
- Large → pulmonary HTN, tricuspid stenosis
- Absent → atrial fibrillation
Cannon a waves
- Cause: AV dissociation
- Seen in: complete heart block, VT
v wave → venous filling of RA during systole
- Giant v waves → tricuspid regurgitation
x descent → atrial relaxation
- Prominent → tamponade, constrictive pericarditis
y descent → ventricular filling
- Slow → tricuspid stenosis
- Rapid → constrictive pericarditis
Kussmaul sign
- JVP rises on inspiration
- Seen in: constrictive pericarditis, restrictive cardiomyopathy
Flashcards
Q1. What JVP finding is characteristic of tricuspid regurgitation?
A. Giant V waves
Explanation: Due to systolic backflow into RA
Q2. What causes cannon a waves?
A. Atrial contraction against closed tricuspid valve
Explanation: Seen in AV dissociation
Q3. Which condition shows Kussmaul sign?
A. Constrictive pericarditis
Explanation: Impaired RV filling → paradoxical JVP rise
Q4. What does a slow y descent indicate?
A. Tricuspid stenosis
Explanation: Delayed RA emptying
Q5. What happens to a wave in atrial fibrillation?
A. It disappears
Explanation: No coordinated atrial contraction
MCQs (High Difficulty)
MCQ 1
A patient with severe right heart failure has a prominent systolic pulsation in the neck veins. Which mechanism best explains this finding?
a. Increased atrial contraction force
b. Regurgitant flow into right atrium during systole
c. Impaired ventricular relaxation
d. Increased pulmonary artery pressure
Answer: b
Explanation: TR causes systolic backflow → giant V waves.
MCQ 2
Which of the following conditions is most associated with cannon a waves?
a. Atrial fibrillation
b. Complete heart block
c. Tricuspid regurgitation
d. Constrictive pericarditis
Answer: b
Explanation: AV dissociation → atria contract against closed valve.
MCQ 3
Which JVP change is FALSELY matched with its condition?
a. Giant v waves – tricuspid regurgitation
b. Slow y descent – tricuspid stenosis
c. Kussmaul sign – cardiac tamponade
d. Cannon a waves – ventricular tachycardia
Answer: c
Explanation: Kussmaul sign is NOT seen in tamponade; it is seen in constrictive pericarditis.
MCQ 4
A patient has rapid y descent and prominent x descent. What is the likely diagnosis?
a. Cardiac tamponade
b. Constrictive pericarditis
c. Tricuspid stenosis
d. Atrial fibrillation
Answer: b
Explanation: Both x and y descents are prominent in constrictive pericarditis.
MCQ 5
Which waveform change is expected in severe tricuspid stenosis?
a. Giant v waves
b. Cannon a waves
c. Slow y descent
d. Prominent x descent
Answer: c
Explanation: Obstruction to RA emptying → slow y descent.
MCQ 6
Which of the following is TRUE regarding the v wave?
a. Occurs during atrial contraction
b. Represents ventricular systole with closed tricuspid valve
c. Disappears in atrial fibrillation
d. Becomes absent in tricuspid regurgitation
Answer: b
Explanation: v wave = atrial filling during systole; exaggerated in TR.
Summary for Quick Exam Revision
Tricuspid regurgitation is a key cause of right-sided heart failure, presenting with elevated JVP, pansystolic murmur at the left lower sternal edge, pulsatile hepatomegaly, and peripheral oedema. The hallmark JVP finding is giant V waves, caused by systolic backflow of blood from the right ventricle into the right atrium. Understanding JVP waveforms is crucial: the a wave reflects atrial contraction, absent in atrial fibrillation and exaggerated in stenotic conditions; c wave is valve closure; v wave represents atrial filling and becomes prominent in regurgitation. Cannon a waves indicate AV dissociation such as complete heart block. Kussmaul sign suggests constrictive pericarditis or restrictive cardiomyopathy. The x descent reflects atrial relaxation and is prominent in tamponade, while the y descent reflects ventricular filling—slow in tricuspid stenosis and rapid in constrictive pericarditis. Recognizing these waveform patterns allows precise bedside diagnosis of valvular and pericardial disease.