Abstract
Objective
To evaluate whether the change in computed tomography pulmonary angiography (CTPA) metrics after balloon pulmonary angioplasty (BPA) can predict treatment effect in chronic thromboembolic pulmonary hypertension (CTEPH) patients.
Methods
This study included 82 CTEPH patients who underwent both CTPA and right heart catheterization (RHC) before and at the scheduled time of 6 months after BPA. The diameters of the main pulmonary artery (dPA), ascending aorta (dAA), right atrium (dRA), right ventricular free wall thickness (dRVW), and right and left ventricles (dRV, dLV) were measured on CTPA. The correlation of the New York Heart Association functional class (NYHA FC), 6-minute walking distance (6MWD), brain natriuretic peptide (BNP) level, and calculated CT metrics with a decrease in mean pulmonary artery pressure (ΔmPAP) using RHC (used as the reference for BPA effect) was investigated. Using multiple regression analysis, independent variables were also identified.
Results
In univariate analysis, clinical indicators (NYHA FC, 6MWD, and BNP level) improved significantly after BPA and were significantly correlated with ΔmPAP (p < 0.01). In the univariate analysis of CTPA parameters, dPA, dRA, dPA/dAA ratio, dRVW, and dRV/dLV ratio decreased significantly and were significantly correlated with ΔmPAP (p < 0.01). Multivariate analysis demonstrated that decreased dPA (p = 0.001) and decreased dRA (p = 0.039) on CTPA were independent predictive factors of ΔmPAP.
Conclusions
Decreased dPA and dRA on CTPA could predict a decrease in mPAP after BPA, thus potentially eliminating unnecessary invasive catheterization.
Key Points
• The reduction in mean pulmonary artery pressure after balloon pulmonary angioplasty in CTEPH patients was significantly correlated with the clinical indices improvement and CTPA parameter decrease.
• The decreased diameter of the main pulmonary artery and the decreased diameter of the right atrium on CTPA were independent predictors of mean pulmonary artery pressure reduction.
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Abbreviations
- 6MWD:
-
6-minute walking distance
- BMI:
-
Body mass index
- BNP:
-
Brain natriuretic peptide
- BPA:
-
Balloon pulmonary angioplasty
- CIx:
-
Cardiac index
- CO:
-
Cardiac output
- CTEPH:
-
Chronic thromboembolic pulmonary hypertension
- CTPA:
-
Computed tomography pulmonary angiography
- dAA:
-
Diameter of the ascending aorta
- DECT:
-
Dual-energy computed tomography
- dLV:
-
Diameter of the left ventricle
- dPA:
-
Diameter of the main pulmonary artery
- dRA:
-
Diameter of the right atrium
- dRV:
-
Diameter of the right ventricle
- ICC:
-
Intraclass correlation coefficient
- mPAP:
-
Mean pulmonary arterial pressure
- mRAP:
-
Mean right atrial pressure
- NYHA FC:
-
New York Heart Association functional class
- PAH:
-
Pulmonary arterial hypertension
- PAWP:
-
Pulmonary artery wedge pressure
- PEA:
-
Pulmonary thromboendarterectomy
- PVR:
-
Pulmonary vascular resistance
- RHC:
-
Right heart catheterization
- ROI:
-
Region of interest
- sBP/dBP/mBP:
-
Systolic/diastolic/mean blood pressures
- SD:
-
Standard deviation
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Acknowledgements
The authors would like to acknowledge all of the patients for their willingness to participate in the study. The authors also thank Naomi Tamaki and Kyoko Komatsu for their valuable assistance.
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The scientific guarantor of this publication is Yoshitake Yamada.
Conflict of interest
Masahiro Jinzaki is a recipient of a grant from Canon Medical Systems. However, Canon Medical Systems was not involved in the design and implementation of this study, the collection, analysis, and interpretation of the data, or the preparation, review, and approval of the manuscript.
All other authors are not associated with companies or other entities.
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No complex statistical methods were necessary for this paper.
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Written informed consent was obtained from all subjects (patients) in this study.
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The study complied with the Declaration of Helsinki, and the protocol for this prospective observational study was approved by the Ethics Committee of our institution (No. 20120224).
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• retrospective
• observational
• performed at one institution
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Tsukada, J., Yamada, Y., Kawakami, T. et al. Treatment effect prediction using CT after balloon pulmonary angioplasty in chronic thromboembolic pulmonary hypertension. Eur Radiol 31, 5524–5532 (2021). https://doi.org/10.1007/s00330-021-07711-5
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DOI: https://doi.org/10.1007/s00330-021-07711-5