Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage
Patients undergoing transcatheter aortic valve replacement (TAVR) may suffer severe clinical complications, caused by paravalvular leakage (PVL) which is defined as leakage between TAVR and aortic annulus. PVL is often facilitated by a severely calcified annulus. This limits the expansion of a self-...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2021-10-01
|
| Series: | Current Directions in Biomedical Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/cdbme-2021-2152 |
| _version_ | 1828304355906813952 |
|---|---|
| author | Borowski Finja Kaule Sebastian Oldenburg Jan Öner Alper Schmitz Klaus-Peter Stiehm Michael |
| author_facet | Borowski Finja Kaule Sebastian Oldenburg Jan Öner Alper Schmitz Klaus-Peter Stiehm Michael |
| author_sort | Borowski Finja |
| collection | DOAJ |
| description | Patients undergoing transcatheter aortic valve replacement (TAVR) may suffer severe clinical complications, caused by paravalvular leakage (PVL) which is defined as leakage between TAVR and aortic annulus. PVL is often facilitated by a severely calcified annulus. This limits the expansion of a self-expandable TAVR stent. To assess TAVR performance in terms of leakage, measurement of regurgitation fraction in a pathophysiological annulus is recommended according to ISO 5840. For this purpose, a configuration of a circular annulus with a calcification nodule has been proposed in the recently published ISO 5840. The impact of the proposed pathophysiological annulus model on the expansion of self-expandable TAVR stents and on the regurgitation fraction was investigated in this study. For this purpose, two commercially available selfexpandable TAVRs (Evolut R and Portico) were implanted in a calcified annulus model. Circular expansion of the TAVR stents was investigated based on μCT scans of the implanted TAVR. The calcification-induced area in which retrograde flow can occur during diastole was detected. These results were then compared with the experimentally determined regurgitation fraction obtained from pulse duplicator tests. The results of the μCT scans showed a continuous leakage area in the region of the annulus for the Evolut R compared to a locally larger leakage area of the Portico, which, however, reattaches to the annulus in the distal inflow region. The hydrodynamic measurements confirmed a smaller leakage in the pathological annulus for the Portico. In summary, it can be assumed that a continuous leakage area in the TAVR stent inflow region encourages the PVL of TAVR. |
| first_indexed | 2024-04-13T14:10:08Z |
| format | Article |
| id | doaj.art-b1c076283398448db440c3e2b0ccea55 |
| institution | Directory Open Access Journal |
| issn | 2364-5504 |
| language | English |
| last_indexed | 2024-04-13T14:10:08Z |
| publishDate | 2021-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Current Directions in Biomedical Engineering |
| spelling | doaj.art-b1c076283398448db440c3e2b0ccea552022-12-22T02:43:48ZengDe GruyterCurrent Directions in Biomedical Engineering2364-55042021-10-017259760010.1515/cdbme-2021-2152Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakageBorowski Finja0Kaule Sebastian1Oldenburg Jan2Öner Alper3Schmitz Klaus-Peter4Stiehm Michael5Institute of ImplantTechnology and Biomaterials e.V., Friedrich-Barnewitz- Straße 4Rostock, GermanyInstitute for ImplantTechnology and Biomaterials e.V.,Rostock, GermanyInstitute for ImplantTechnology and Biomaterials e.V.,Rostock, GermanyDepartment of Cardiology Rostock University Medical Center,Rostock, GermanyInstitute for ImplantTechnology and Biomaterials e.V.,Rostock, GermanyInstitute for ImplantTechnology and Biomaterials e.V.,Rostock, GermanyPatients undergoing transcatheter aortic valve replacement (TAVR) may suffer severe clinical complications, caused by paravalvular leakage (PVL) which is defined as leakage between TAVR and aortic annulus. PVL is often facilitated by a severely calcified annulus. This limits the expansion of a self-expandable TAVR stent. To assess TAVR performance in terms of leakage, measurement of regurgitation fraction in a pathophysiological annulus is recommended according to ISO 5840. For this purpose, a configuration of a circular annulus with a calcification nodule has been proposed in the recently published ISO 5840. The impact of the proposed pathophysiological annulus model on the expansion of self-expandable TAVR stents and on the regurgitation fraction was investigated in this study. For this purpose, two commercially available selfexpandable TAVRs (Evolut R and Portico) were implanted in a calcified annulus model. Circular expansion of the TAVR stents was investigated based on μCT scans of the implanted TAVR. The calcification-induced area in which retrograde flow can occur during diastole was detected. These results were then compared with the experimentally determined regurgitation fraction obtained from pulse duplicator tests. The results of the μCT scans showed a continuous leakage area in the region of the annulus for the Evolut R compared to a locally larger leakage area of the Portico, which, however, reattaches to the annulus in the distal inflow region. The hydrodynamic measurements confirmed a smaller leakage in the pathological annulus for the Portico. In summary, it can be assumed that a continuous leakage area in the TAVR stent inflow region encourages the PVL of TAVR.https://doi.org/10.1515/cdbme-2021-2152tavr hemodynamicsparavalvular leakage |
| spellingShingle | Borowski Finja Kaule Sebastian Oldenburg Jan Öner Alper Schmitz Klaus-Peter Stiehm Michael Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage Current Directions in Biomedical Engineering tavr hemodynamics paravalvular leakage |
| title | Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage |
| title_full | Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage |
| title_fullStr | Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage |
| title_full_unstemmed | Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage |
| title_short | Quantification of noncircular stent expansion after TAVR into a pathological annulus and its impact on paravalvular leakage |
| title_sort | quantification of noncircular stent expansion after tavr into a pathological annulus and its impact on paravalvular leakage |
| topic | tavr hemodynamics paravalvular leakage |
| url | https://doi.org/10.1515/cdbme-2021-2152 |
| work_keys_str_mv | AT borowskifinja quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage AT kaulesebastian quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage AT oldenburgjan quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage AT oneralper quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage AT schmitzklauspeter quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage AT stiehmmichael quantificationofnoncircularstentexpansionaftertavrintoapathologicalannulusanditsimpactonparavalvularleakage |