How is tricuspid annular plane systolic excursion (TAPSE) measured on echocardiography and what is its clinical significance?

TAPSE Measurement and Clinical Significance

TAPSE is measured using M-mode echocardiography as the longitudinal excursion of the lateral tricuspid annulus from end-diastole to peak systole, with normal values ≥16 mm, and serves as a simple, reproducible marker of right ventricular systolic function with established prognostic value across multiple cardiac conditions. 1

How to Measure TAPSE

Standard M-Mode Technique

• Position the M-mode cursor through the lateral tricuspid annulus in the apical 4-chamber view
• Ensure proper alignment with the direction of RV longitudinal excursion
• Measure the vertical displacement between end-diastole and peak systole 2
• The measurement reflects the distance the tricuspid annulus moves toward the apex during systole 1

Normal Values and Thresholds

• Normal TAPSE: ≥16 mm 1, 3
• RV dysfunction: <16 mm 1
• Severe dysfunction: <14 mm 4

The 2019 ESC Pulmonary Embolism Guidelines clearly illustrate that TAPSE <16 mm indicates decreased RV function 1, while the 2025 Heart Failure consensus identifies TAPSE <14 mm as a marker of advanced heart failure 4.

Clinical Significance and Prognostic Value

Established Prognostic Applications

Heart Failure: TAPSE has demonstrated independent prognostic value in both HFrEF and HFpEF populations. In heart failure patients, TAPSE correlates with exercise capacity, New York Heart Association functional class, and mortality risk 5, 6. The parameter is particularly valuable because it reflects RV longitudinal function, which is predominantly affected in heart failure states 2.

Pulmonary Embolism: In acute PE, decreased TAPSE indicates RV dysfunction and helps risk-stratify patients. The presence of TAPSE <16 mm supports RV pressure overload and may guide decisions regarding escalation of therapy in hemodynamically compromised patients 1, 7.

Pulmonary Hypertension: TAPSE <1.8 cm powerfully predicts mortality in pulmonary arterial hypertension, with each 1-mm decrease increasing death risk by 17% 8. Survival at 1-2 years drops dramatically when TAPSE falls below this threshold (60% and 50% vs 94% and 88%) 8.

Tricuspid Regurgitation: When evaluating TR severity, TAPSE assessment is mandatory when TR exceeds mild severity, as it helps determine the presence and degree of RV dysfunction 5.

Important Caveats and Limitations

Load Dependency

TAPSE is load-dependent and may not reflect true RV myocardial function in certain conditions 5:

• Severe tricuspid regurgitation: Both TAPSE and systolic velocities are less accurate in severe TR due to volume loading effects 5
• Early post-operative period: TAPSE may not reliably reflect RV function immediately after cardiac surgery 5
• RV volume states: TAPSE correlates with RV end-diastolic volume in addition to ejection fraction, requiring higher cut-off values (2.4 cm vs 2.0 cm) in dilated RV to maintain diagnostic accuracy 9

Technical Limitations

• Angle dependency: M-mode TAPSE requires proper alignment with RV longitudinal motion; misalignment reduces accuracy 2
• Regional assessment only: TAPSE primarily reflects lateral wall function and may not capture global RV dysfunction, particularly after thoracotomy, pulmonary thromboendarterectomy, or heart transplantation 2
• Pericardial constraint: In conditions with significant pericardial constraint, TAPSE may underestimate true RV contractile function 6

When to Use Alternative Parameters

Consider less load-dependent measures when TAPSE limitations apply 5:

• 2D longitudinal strain and strain rate in severe TR
• RV fractional area change (FAC) for more comprehensive assessment (normal >35%) 2
• 3D RV ejection fraction when image quality permits 2
• Tissue Doppler S' velocity (normal ≥9.5 cm/s) as complementary measure 4, 2

Integration with Other Parameters

TAPSE should not be interpreted in isolation. The 2013 EACVI guidelines emphasize integrating TAPSE with 5:

• RV dimensions and volumes
• RA volume
• Inferior vena cava diameter and respiratory variation
• Pulmonary artery systolic pressure
• Presence and severity of tricuspid regurgitation

The TAPSE/sPAP ratio (normal ≥0.55 mm/mmHg) provides valuable assessment of RV-PA coupling and has superior prognostic value compared to TAPSE alone in acute coronary syndrome and pulmonary embolism 10, 11.

Practical Clinical Application

For routine clinical practice, measure TAPSE in all patients undergoing comprehensive echocardiography, particularly when evaluating 12, 4:

• Suspected or known heart failure
• Pulmonary hypertension
• Significant valvular disease (especially left-sided)
• Acute dyspnea or hemodynamic instability
• Post-cardiac surgery monitoring

Document the measurement method (M-mode vs 2D) and reference line used, as different techniques are not interchangeable 13. Report alongside other RV functional parameters to provide comprehensive assessment of right heart function 12.