RV/LV Diameter Ratio on CTPA
ESC 2019 / Quiroz 2004 / Kang 2011Computes the right-to-left ventricular diameter ratio on CT pulmonary angiography and bands it against the >0.9 (4-chamber adverse events), >1.0 (ESC RV-dysfunction criterion) and ≥1.5 (marked dilatation) thresholds, with measurement-plane guidance.
Also searched as: pulmonary embolism · right ventricle · RV strain · risk stratification · strain
Information
Incomplete input
- Please provide: maximal RV inner diameter (mm), maximal LV inner diameter (mm), measurement plane (axial vs reformatted 4-chamber).
How this tool works
RV dilatation on CTPA is the imaging hallmark of RV dysfunction in acute pulmonary embolism and, together with an elevated cardiac biomarker and a positive clinical severity score (PESI III–V or sPESI ≥1), defines the ESC 2019 intermediate-high-risk category. Ventricular diameters are measured inner wall to inner wall at the valvular levels (RV at the tricuspid valve, LV at the mitral valve, basal thirds of each chamber). Measurement plane matters: ratios from reformatted 4-chamber views outperformed axial measurements in outcome studies (Quiroz 2004; Kang 2011), so this tool records and interprets the plane used.
References
- Quiroz R et al. Circulation 2004;109:2401-4
- Kang DK et al. JACC Cardiovasc Imaging 2011 (4-chamber >1.0 predictive)
- 2019 ESC/ERS acute PE guidelines, Eur Heart J 2020;41:543-603
- Measurement technique review (J Korean Med Sci 2022)
Implemented from the cited published sources. Educational use only; confirm against current guidelines before clinical use.
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