TAPSE/PASP Optimization Index (Therapeutic Decision Aid)
- TAPSE/PASP Optimization Index: Comprehensive Explanation and Clinical Context
Definition & Formula: The TAPSE/PASP ratio (mm/mmHg) is a noninvasive surrogate of right ventricular-pulmonary arterial (RV-PA) coupling. It is calculated as tricuspid annular plane systolic excursion (TAPSE, in mm) divided by pulmonary artery systolic pressure (PASP, in mmHg).
Measurement: TAPSE is measured by M-mode at the lateral tricuspid annulus in the apical 4-chamber view. PASP is estimated from peak tricuspid regurgitation velocity (Bernoulli) plus an estimate of right atrial pressure (e.g., from IVC size/collapsibility).
Interpretation: Lower ratios indicate RV-PA uncoupling. In heart failure populations, values ≤ 0.36 mm/mmHg consistently associate with worse outcomes; several cohorts identify ≤ 0.31 as a very abnormal tier. In pulmonary arterial hypertension, very low ratios (< 0.19) identify high 1-year mortality risk, while 0.19-0.31 reflects intermediate risk. In acute pulmonary embolism, a cut-off near 0.34 has been reported for adverse outcomes. These thresholds are population-specific and should be interpreted alongside clinical context and measurement quality.
Clinical Significance: The ratio integrates RV contractile shortening (TAPSE) relative to afterload (PASP), offering a practical bedside gauge of RV reserve and treatment response. It adds prognostic value across HF (HFrEF/HFpEF), PAH, valve disease, CRT candidates, and acute PE cohorts.
Limitations: Angle dependency and tethering can affect TAPSE; PASP estimation depends on adequate TR signal and RA pressure assumptions. Consider complementary parameters (RV FAC, S′, TAPSE/sPAP via invasive data, RV strain, TR grade, IVC indices) and disease-specific risk models.
References
Anastasiou V, et al. Heart Failure Reviews. 2024: TAPSE/PASP ≤ 0.36 linked to mortality in HF meta-analysis.
Fortuni F, et al. JACC: Cardiovascular Interventions. 2023: In PAH, TAPSE/PASP < 0.19 associated with high 1-year mortality; 0.19-0.31 intermediate.
Tello K, et al. Eur Respir J. 2019: Conceptual and empirical basis for RV-PA coupling via TAPSE/PASP.
Riccardi M, et al. 2024 (open-access cohort): Prognostic value in outpatients with LV systolic dysfunction.
Anatolian Journal of Cardiology, 2024: Acute PE optimal cut-off ≈ 0.34 by Youden index.
Additional contemporary reviews: Yao M, et al. Diagnostics. 2025 (limitations); Gutierrez-Ortiz E, et al. J Clin Med. 2025 (TTE vs invasive agreement).
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