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The impact of calcium volume and distribution in aortic root injury related to balloon-expandable transcatheter aortic valve replacement
Aarhus University Hospital, Denmark.
Aarhus University Hospital, Denmark.
St Pauls Hospital, Canada; University of Catania, Italy.
Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Cardiology in Linköping.
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2015 (English)In: JOURNAL OF CARDIOVASCULAR COMPUTED TOMOGRAPHY, ISSN 1934-5925, Vol. 9, no 5, 382-392 p.Article in journal (Refereed) Published
Abstract [en]

Background: A detailed assessment of calcium within the aortic root may provide important additional information regarding the risk of aortic root injury during transcatheter heart valve replacement (TAVR). Objective: We sought to delineate the effect of calcium volume and distribution on aortic root injury during TAVR. Methods: Thirty-three patients experiencing aortic root injury during TAVR with a balloon-expandable valve were compared with a control group of 153 consecutive TAVR patients without aortic root injury (as assessed by post-TAVR multidetector CT). Using commercial software to analyze contrast-enhanced pre-TAVR CT scans, caltium volume was determined in 3 regions: (1) the overall left ventricular outflow tract (LVOT), extending 10 mm down from the aortic annulus plane; (2) the upper LVOT, extending 2 mm down from the annulus plane; and (3) the aortic valve region. Results: Calcium volumes in the upper LVOT (median, 29 vs 0 mm(3); P less than .0001) and overall LVOT (median, 74 vs 3 mm(3); P = .0001) were higher in patients who experienced aortic root injury compared with the control group. Calcium in the aortic valve region did not differ between groups. Upper LVOT calcium volume was more predictive of aortic root injury than overall LVOT calcium volume (area under receiver operating curve [AUG]; 0.78; 95% confidence interval, 0.69-0.86 vs AUC, 0.71; 95% confidence interval, 0.62-0.82; P = .010). Upper LVOT calcium below the noncoronary cusp was significantly more predictive of aortic root injury compared to calcium underneath the right coronary cusp or the left coronary cusp (AUC, 0.81 vs 0.68 vs 0.64). Prosthesis oversizing greater than20% (likelihood ratio test, P = .028) and redilatation (likelihood ratio test, P = .015) improved prediction of aortic root injury by upper LVOT calcium volume. Conclusion: Calcification of the LVOT, especially in the upper LVOT, located below the noncoronary cusp and extending from the annular region, is predictive of aortic root injury during TAVR with a balloon-expandable valve. (C) 2015 Society of Cardiovascular Computed Tomography. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE INC , 2015. Vol. 9, no 5, 382-392 p.
Keyword [en]
Aortic root calcification; Aortic root injury; Multidetector computed tomography; Transcatheter aortic valve replacement
National Category
Clinical Medicine
Identifiers
URN: urn:nbn:se:liu:diva-122215DOI: 10.1016/j.jcct.2015.04.002ISI: 000361930700002PubMedID: 26164109OAI: oai:DiVA.org:liu-122215DiVA: diva2:864319
Note

Funding Agencies|Edwards Lifesciences; Danish Heart Foundation

Available from: 2015-10-26 Created: 2015-10-23 Last updated: 2015-10-26

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Nielsen, Niels Erik
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Division of Cardiovascular MedicineFaculty of Health SciencesDepartment of Cardiology in Linköping
Clinical Medicine

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