Abstract
Purpose
Additional pulmonary blood flow (APBF) can provide better pulsating blood flow and systemic arterial oxygen saturation, while low blood pulsation and low oxygen saturation are defects of the Fontan and Glenn procedure. Studying the hemodynamic effect of APBF is beneficial for clinical decisions. This study aimed to explore the effect on particle washout, as well as the differences among the sensitivities of both different hemodynamic parameters and different procedures to APBF.
Methods
The patient-specific clinical datasets of a patient who underwent bilateral bidirectional Glenn (BBDG) with APBF were enrolled in this study, and using these datasets, Glenn- and Fontan-type artery models were reconstructed. A series of parameters, including the total caval flow pulsatility index (TCPI), indexed energy loss (iPL), wall shear stress (WSS), systemic arterial oxygen saturation (Satart), particle washout time (WOT), pressure in the right superior vena cava (PRSVC), pulmonary flow distribution (PFD) and hepatic flow distribution (HFD), were computed from computational fluid dynamic (CFD) simulation to evaluate the hemodynamic effect of APBF.
Results
The result showed that APBF led to better iPL and Satart but worse PRSVC and heart load accompanied by a great impact on HFD, making hepatic flow easier to perfuse the side without MPA and APBF. The increase in the APBF rate also effectively results in larger flow pulsation, region velocity, and wall shear stress and lower WOT, and this effect may be more effective for patients with persistent left superior vena cava (PLSVC). However, APBF might have little effect on PFD. Furthermore, APBF might affect WOT, iPL and HFD more significantly than PRSVC and has a greater improvement effect in patients with poorer iPL and WOT.
Conclusions
Moderate APBF is not only a measure to promote pulmonary artery growth and systemic arterial oxygen saturation but also an effective method against endothelial dysfunction and thrombosis. However, moderate APBF is patient-specific and should be determined based on hemodynamic preference that leads to desired patient outcomes, and care should be taken to prevent PRSVC and heart load from being too high as well as an imbalance in HFD.
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Abbreviations
- BDG:
-
Bidirectional Glenn
- BBDG:
-
Bilateral bidirectional Glenn
- TCPC:
-
Total cavopulmonary connection
- SVC:
-
Superior vena cava
- RSVC:
-
Right superior vena cava
- LSVC:
-
Left superior vena cava
- RPA:
-
Right pulmonary artery
- LPA:
-
Left pulmonary artery
- FP:
-
Fontan pathway
- APBF:
-
Additional pulmonary blood flow
- α :
-
Index of APBF rate
- WSS:
-
Wall shear stress
- PHD:
-
Pulmonary flow distribution
- HFD:
-
Hepatic flow distribution
- TCPI :
-
Total caval flow pulsatility index
- \({\text{SD}}_{{{\text{O}}_{2} }}\) :
-
Systemic oxygen delivery
- Satart :
-
Systemic arterial oxygen saturation
- P RSVC :
-
Pressure in the RSVC
- WOT:
-
Particle wash-out time
- iPL:
-
Indexed energy loss
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Acknowledgments
This study was supported by the key Program of Union of National Natural Science Foundation of China-Guangdong Province [U1401255], the National key Research and Development Program [2018YFC1002600], the Natural Science Foundation of Guangdong Province [2018A030313785], Science and Technology Planning Project of Guangdong Province, China [Nos. 2017A070701013, 2017B090904034, 2017B030314109, 2018B090944002 and 2019B020230003], and Guangdong Peak Project [DFJH201802].
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Chen, X., Yuan, H., Liu, J. et al. Hemodynamic Effects of Additional Pulmonary Blood Flow on Glenn and Fontan Circulation. Cardiovasc Eng Tech 11, 268–282 (2020). https://doi.org/10.1007/s13239-020-00459-x
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DOI: https://doi.org/10.1007/s13239-020-00459-x