From the Research
The E/A ratio of the tricuspid valve is approximately 0.8 to 2.1, with an average of about 1.5 in healthy adults, as indicated by the most recent study 1.
Background
The E/A ratio is a measurement used in echocardiography to assess right ventricular diastolic function. This ratio represents the relationship between early (E wave) and late (A wave) diastolic filling velocities across the tricuspid valve.
Key Points
- The E wave corresponds to passive filling of the right ventricle during early diastole, while the A wave represents the additional filling that occurs during atrial contraction.
- Changes in this ratio can indicate diastolic dysfunction of the right ventricle.
- A decreased E/A ratio (less than 0.8) may suggest impaired relaxation, while an elevated ratio (greater than 2.1) might indicate restrictive filling patterns.
- Age affects this measurement, with the E/A ratio typically decreasing as people get older due to natural changes in cardiac compliance.
Clinical Relevance
When interpreting the tricuspid E/A ratio, it should be considered alongside other echocardiographic parameters for a comprehensive assessment of right heart function, as highlighted in the study 1. The study demonstrated the feasibility and efficacy of CMR in assessing diastolic function in pediatric patients, with CMR-derived E/e' ratio being the most effective in identifying RV diastolic dysfunction.
Recommendations
- The E/A ratio should be used in conjunction with other diagnostic tools to assess right ventricular diastolic function.
- An E/A ratio outside the normal range (0.8 to 2.1) may indicate diastolic dysfunction and should be further evaluated.
- The most recent study 1 provides the most up-to-date information on the E/A ratio and its clinical significance.