Author + information
- Received November 2, 2017
- Revision received January 16, 2018
- Accepted January 17, 2018
- Published online March 14, 2018.
- Anastasia Vamvakidou, MBBSa,b,c,
- Wenying Jin, MD, PhDa,b,
- Oleksandr Danylenko, MD, PhDa,b,
- Navtej Chahal, MBBS, PhDa,b,c,
- Rajdeep Khattar, MBBS, DMb,c and
- Roxy Senior, MD, DMa,b,c,∗ ()
- aNorthwick Park Hospital, Harrow, United Kingdom
- bRoyal Brompton Hospital, London, United Kingdom
- cBiomedical Research Unit, National Heart and Lung Institute, Imperial College, London, United Kingdom
- ↵∗Address for correspondence:
Dr. Roxy Senior, Department of Cardiology, Royal Brompton Hospital, Sydney Street, London SW3 6NP, United Kingdom.
Objectives This study aimed to assess the value of low transvalvular flow rate (FR) for the prediction of mortality compared with low stroke volume index (SVi) in patients with low-gradient (mean gradient: <40 mm Hg), low aortic valve area (<1 cm2) aortic stenosis (AS) following aortic valve intervention.
Background Transaortic FR defined as stroke volume/left ventricular ejection time is also a marker of flow; however, no data exist comparing the relative prognostic value of these 2 transvalvular flow markers in patients with low-gradient AS who had undergone valve intervention.
Methods We retrospectively followed prospectively assessed consecutive patients with low-gradient, low aortic valve area AS who underwent aortic valve intervention between 2010 and 2014 for all-cause mortality.
Results Of the 218 patients with mean age 75 ± 12 years, 102 (46.8%) had low stroke volume index (SVi) (<35 ml/m2), 95 (43.6%) had low FR (<200 ml/s), and 58 (26.6%) had low left ventricular ejection fraction <50%. The concordance between FR and SVi was 78.8% (p < 0.005). Over a median follow-up of 46.8 ± 21 months, 52 (23.9%) deaths occurred. Patients with low FR had significantly worse outcome compared with those with normal FR (p < 0.005). In patients with low SVi, a low FR conferred a worse outcome than a normal FR (p = 0.005), but FR status did not discriminate outcome in patients with normal SVi. By contrast, SVi did not discriminate survival either in patients with normal or low FR. Low FR was an independent predictor of mortality (p = 0.013) after adjusting for age, clinical prognostic factors, European System for Cardiac Operative Risk Evaluation II, dimensionless velocity index, left ventricular mass index, left ventricular ejection fraction, heart rate, time, type of aortic valve intervention, and SVi (p = 0.59).
Conclusions In patients with low-gradient, low valve area aortic stenosis undergoing aortic valve intervention, low FR, not low SVi, was an independent predictor of medium-term mortality.
Dr. Senior has received speaker fees from Bracco Imaging, Lantheus Medical Imaging, and Philips Healthcare. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.
- Received November 2, 2017.
- Revision received January 16, 2018.
- Accepted January 17, 2018.
- 2018 American College of Cardiology Foundation
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