Original article
Adult cardiac
Effect of Concomitant Coronary Artery Disease on Procedural and Late Outcomes of Transcatheter Aortic Valve Implantation

Presented at the Forty-fifth Annual Meeting of The Society of Thoracic Surgeons, San Francisco, CA, Jan 26–28, 2009.
https://doi.org/10.1016/j.athoracsur.2009.12.033Get rights and content

Background

Previous coronary artery bypass grafting increases predicted operative risk for conventional valve replacement, according to the Society of Thoracic Surgeons risk algorithm. Additionally, the presence of coronary artery disease (CAD) has been demonstrated to increase procedural risk with conventional aortic valve replacement. Significant coexisting CAD requires preemptive percutaneous coronary intervention (PCI) in patients under consideration for transcatheter aortic valve implantation (TAVI). This study examined the impact of previous coronary artery bypass grafting or PCI on procedural outcomes and overall survival in patients having TAVI.

Methods

Two hundred and one high-risk patients were enrolled in two international feasibility studies from December 2005 to February 2008 for the treatment of aortic stenosis using TAVI. Thirty patients were excluded from analysis due to failure to successfully deploy the valve in the aortic annulus. Data were collected concurrently using an ad hoc database that included operative and long-term survival. Previous cardiovascular intervention prior to TAVI was used to identify the existence of concomitant CAD. Logistic regression along with Kaplan-Meier estimates were employed to establish the association between CAD and survival from TAVI.

Results

Overall mortality after TAVI was significantly higher among the CAD group (35.7%) in contrast with the non-CAD patients (18.4%), p = 0.01. Logistic regression analysis found that patients who had CAD were 10.1 times more likely to die (95% confidence interval 2.1 to 174.8) within 30 days of the procedure than those who did not. Proportional hazards analysis established that the risk of dying at any point in time was 2.3 times higher among the patients with CAD (95% confidence interval 1.29 to 4.17). Kaplan-Meier survival curves demonstrate improved long-term survival among patients without CAD.

Conclusions

Coexisting coronary artery disease negatively impacts procedural outcomes and long-term survival in patients undergoing TAVI, and implies that risk assessment and anticipated outcomes might be inaccurate due to stratification as isolated aortic valve replacement rather than AVR+CABG. Comparison of procedural outcomes, based on operative approach without controlling for unequal distribution of CAD in the cohorts, are likely invalid.

Section snippets

Patients and Methods

This study is a retrospective review of data records of 201 patients enrolled in two studies. It was reviewed and approved by the North Texas Institutional Review Board at Medical City Dallas with a waiver of consent.

Between December of 2005 and February of 2008, 201 high-risk patients were enrolled in two feasibility studies utilizing the stainless-steel balloon expandable Sapien valve (Edwards Lifesciences, Irvine, CA) at 12 participating centers in North America and Europe. A total of 40

Results

A total of 201 patients were identified as having undergone attempted TA-AVI (n = 40) or TF-AVI (n = 161) from 12 centers in North America and Europe between December 2005 and February 2008 as part of transapical and transfemoral feasibility trials. In the 40 patient TA-AVI trial, five patients were excluded from analysis due to technical complications that resulted in embolization of the valve or malplacement such that conversion to an open procedure was required. Table 1 characterizes the 35

Comment

It is axiomatic that aortic valve replacement is the treatment of choice for patients with critical aortic stenosis. However, certain patient populations have been excluded from conventional surgical therapy due to perceived elevated operative risk [12, 13]. Transcatheter aortic valve implantation, either retrograde through a transfemoral approach or antegrade through a transapical approach, has become a clinical reality in the treatment of critical aortic stenosis in high-risk patients. Early

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