Abstract
Objectives
In this pilot study we explored whether contrast-material bolus propagation time and speed in the pulmonary arteries (PAs) determined by dynamic contrast-enhanced computed tomography (DCE-CT) can distinguish between patients with and without pulmonary hypertension (PH).
Methods
Twenty-three patients (18 with and 5 without PH) were examined with a DCE-CT sequence following their diagnostic or follow-up right-sided heart catheterisation (RHC). X-ray attenuation over time curves were recorded for regions of interest in the main, right and left PA and fitted with a spline fit. Contrast material bolus propagation speeds and time differences between the peak concentrations were compared with haemodynamic parameters from RHC.
Results
Bolus speed correlated (ρ = −0.55) with mean pulmonary arterial pressure (mPAP) and showed a good discriminative power between patients with and without PH (cut-off speed 317 mm/s; sensitivity 100 %/specificity 100 %). Additionally, time differences between peaks correlated with mPAP (ρ = 0.64 and 0.49 for right and left PA, respectively) and discrimination was achieved with sensitivity 100 %/specificity 100 % (cut-off time 0.15 s) and sensitivity 93 %/specificity 80 % (cut-off time 0.45 s), respectively.
Conclusions
Bolus propagation speed and time differences between contrast material peaks in the PA can identify PH. This method could be used to confirm the indication for RHC in patients screened for pulmonary hypertension.
Key Points
• Dynamic contrast-enhanced computed tomography (CT) can identify patients with pulmonary hypertension.
• Bolus propagation speed in the pulmonary artery is reduced in pulmonary hypertension.
• Peak-contrast propagation times provide a practical surrogate for speed.
• This non-invasive technique could serve as a screening method for pulmonary hypertension.
• Invasive right-sided heart catheterisations might be restricted to a smaller group of patients.
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Abbreviations
- AVDO2 :
-
arterial-venous difference in oxygen content
- CM:
-
contrast material
- CO:
-
cardiac output
- IPAH:
-
idiopathic pulmonary arterial hypertension
- mPAP:
-
mean pulmonary artery pressure
- PA:
-
pulmonary artery
- PH:
-
pulmonary hypertension
- PVR:
-
pulmonary vascular resistance
- RHC:
-
right-sided heart catheterisation
- SO2 :
-
oxygen saturation
- t max :
-
time to peak
- Δt max :
-
propagation time between regions of interest
- v bolus :
-
propagation speed of CM bolus
- \( \overline{v_{bolus}} \) :
-
average propagation speed of CM bolus
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Acknowledgements
The authors would like to thank Wolfgang Loidl for his help in setting up the examination protocol, Dr. László Fóris for fruitful discussions, Dr. Daniela Kleinschek for retrieving patient data and Eugenia Lamont for the linguistic review.
Clinical trial registration: ClinicalTrials.gov (NCT01607489).
The preliminary data of this manuscript was presented as an oral presentation at the European Congress of Radiology 2013, Vienna, Austria.
This study was funded by the Ludwig Boltzmann Institute for Lung Vascular Research.
None of the authors declared potential conflicts of interest.
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Pienn, M., Kovacs, G., Tscherner, M. et al. Non-invasive determination of pulmonary hypertension with dynamic contrast-enhanced computed tomography: a pilot study. Eur Radiol 24, 668–676 (2014). https://doi.org/10.1007/s00330-013-3067-8
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DOI: https://doi.org/10.1007/s00330-013-3067-8