II. Physiology: Atrial Pressure Waves
- A Wave
- Rise in atrial pressure during late diastole with atrial contraction
- A Wave may be visible at Jugular Vein in neck on bedside exam
- Precedes carotid pulsation
- Large A Wave causes
- Pulmonary Artery Stenosis
- Third degree AV Block
- Atrium contracts against a closed tricuspid valve (simultaneous atrial and ventricular contraction)
- C Wave
- Atrioventricular valves close during the start of systole
- V Wave
- Atrial filling during systole
- Large V Wave Causes
- Large V waves may be visible in neck (coinciding with S1 Heart Sound)
- Tricuspid insufficiency
III. Technique: Jugular Venous Pressure measurement
- Examine position
- Head of bed elevated at 45 degree angle
- Head turned to right
- Identify top of venous pulsation in neck (JVP)
- Jugular Venous Pulsations are inward
- Contrast with outward Carotid Artery pulsations
- Identify the sternal angle (Angle of Louis)
- Located at superior edge or notch of Sternum
- Measure distance between top of pulsation and Sternum
- Measured in centimeters
IV. Interpretation: Distance between JVP and Sternum
- Normal: 4 cm or less
- Increased >4 cm (Jugular Venous Distention)
- Right-sided Heart Failure (most common)
- Increased Right Atrial Pressure
- Constrictive Pericarditis
- Tricuspid stenosis
- Superior Vena Cava Obstruction
- Valsalva phenomenon (laughing, coughing)
- Right-sided Heart Failure (most common)
- Provocative: Hepatojugular Reflux
- Apply firm pressure to midabdomen for 30 seconds
- Apply 20-30 mmHg of pressure
- Positive test: >4 cm JVP rise for >10 seconds
- Suggests CHF (right or left sided failure)
- Falsely positive if Valsalva (abdominal guarding)
- Apply firm pressure to midabdomen for 30 seconds
- Kussmaul's Sign
- Paradoxical rise in JVP with inspiration
- JVP normally falls with inspiration
- Causes
- Constrictive Pericarditis
- Cardiac Tamponade
- Paradoxical rise in JVP with inspiration
V. Efficacy in CHF diagnosis
- Jugular Venous Distention (JVD) alone
- Test Sensitivity: 17%
- Test Specificity: 98%
- JVD with Hepatojugular reflex (provocative)
- Test Sensitivity: 33%
- Test Specificity: 94%
VI. References
- Bates (1991) Physical Exam, p. 287-8
- Timmis (1988) Cardiology, p. 12
- Degowin (1987) Bedside Exam, p. 409-15
- Dosh (2004) Am Fam Physician 70:2145-52 [PubMed]