TAPSE Values Indicating Significant Pulmonary Hypertension
TAPSE <16 mm raises suspicion for significant pulmonary hypertension and indicates right ventricular dysfunction. 1, 2, 1
Absolute TAPSE Thresholds
- TAPSE <16 mm is the established cutoff that suggests RV systolic dysfunction in the context of pulmonary hypertension 1, 2, 1, 3
- TAPSE <14 mm indicates more severe RV dysfunction and is associated with advanced heart failure 4
- TAPSE <18 mm has been associated with increased mortality in pulmonary arterial hypertension, with survival estimates of only 60% at 1 year and 50% at 2 years compared to 94% and 88% respectively in patients with TAPSE ≥18 mm 5
The 2019 ESC/ERS Guidelines specifically illustrate TAPSE <16 mm as a key echocardiographic parameter for assessing right ventricular pressure overload in pulmonary embolism and pulmonary hypertension 1, 2, 1. This threshold represents impaired longitudinal systolic motion of the right ventricle at the lateral tricuspid annulus 4.
TAPSE/sPAP Ratio Thresholds
The TAPSE/sPAP ratio provides superior prognostic information compared to TAPSE alone, with critical thresholds at 0.31-0.32 mm/mmHg and 0.55 mm/mmHg. 6, 7
Key TAPSE/sPAP Ratio Cutoffs:
- TAPSE/sPAP <0.31 mm/mmHg discriminates RV-arterial uncoupling (sensitivity 87.5%, specificity 75.9%) and predicts significantly worse prognosis in severe pulmonary hypertension 6
- TAPSE/sPAP ≤0.32 mm/mmHg is the most significant predictive factor for all-cause mortality in systemic sclerosis patients (HR 0.310,95% CI 0.164-0.585) 7, 8
- TAPSE/sPAP <0.55 mm/mmHg is a predictive risk factor for pulmonary hypertension diagnosis in systemic sclerosis (OR 0.251,95% CI 0.084-0.753) 7
The TAPSE/sPAP ratio serves as a noninvasive surrogate for RV-arterial coupling and correlates with invasively measured end-systolic/arterial elastance ratio 6. This ratio is particularly valuable because it accounts for both RV function and afterload, providing a more comprehensive assessment than either parameter alone 6, 9.
Clinical Context and Additional Echocardiographic Signs
TAPSE values must be interpreted alongside other echocardiographic signs of pulmonary hypertension to establish diagnostic probability. 1, 10, 11
Supporting Echocardiographic Findings:
- Tricuspid regurgitation velocity >2.8 m/s (corresponding to sPAP >36 mmHg assuming normal right atrial pressure) 10, 11
- RV/LV basal diameter ratio >1.0 1, 10, 11
- Flattened interventricular septum 1, 2, 1
- PA diameter >25 mm 10, 11
- IVC diameter >21 mm with decreased inspiratory collapse (<50%) 1, 10, 11
The 2015 ESC/ERS Guidelines establish that high echocardiographic probability of PH requires either tricuspid regurgitation velocity >3.4 m/s or velocity 2.9-3.4 m/s with additional signs from at least two categories (RV findings, PA findings, or IVC/RA findings) 10, 11.
Prognostic Implications
Reduced TAPSE and TAPSE/sPAP ratios independently predict mortality even in patients with normal or mildly elevated pulmonary artery pressures. 9
- In patients with mean PAP <25 mmHg, TAPSE/sPAP ratio independently predicts clinical worsening (HR 0.71,95% CI 0.53-0.95) 9
- For every 1-mm decrease in TAPSE, the unadjusted risk of death increases by 17% (HR 1.17,95% CI 1.05-1.30) in pulmonary arterial hypertension 5
- TAPSE/sPAP ratio correlates significantly with 6-minute walk distance (r=0.33) and exercise hemodynamics (mPAP/CO slope: rρ=-0.56) 9
Important Caveats
TAPSE may be decreased in acute pulmonary embolism patients even without chronic pulmonary hypertension, and can be affected by conditions other than PH. 1, 2
- TAPSE can be reduced in patients with LV systolic dysfunction or significant valvular heart disease unrelated to pulmonary hypertension 1
- In patients with chronic thromboembolic disease or chronic PH, increased RV wall thickness or tricuspid insufficiency jet velocity >3.8 m/s (gradient >60 mmHg) suggests chronic rather than acute RV pressure overload 2
- Right heart catheterization remains necessary for confirmation of PH before treatment initiation when intermediate or high echocardiographic probability is present 12, 10, 11