Morphological characteristics of severe aortic stenosis in China: imaging corelab observations from the first Chinese transcatheter aortic valve trial

Catheter Cardiovasc Interv. 2015 Mar;85 Suppl 1:752-61. doi: 10.1002/ccd.25863. Epub 2015 Feb 19.

Abstract

Objectives: We sought to describe the morphological characteristics of aortic valve disease in a Chinese population presenting for transcatheter aortic valve replacement (TAVR).

Background: Racial and regional differences are known to exist in aortic stenosis (AS), but limited data exist comparing the specific anatomical variations between populations.

Methods: Patients were prospectively evaluated in a Chinese population presenting for TAVR in the Venus A-Valve trial, the first trial evaluating TAVR in China. A systematic anatomical assessment protocol employed contrast-enhanced computed tomography (CT) in all the cases.

Results: A total of 120 consecutive patients were studied. Of these, 61 (50.7%) were patients with tricuspid, 57 (47.5%) bicuspid, and 2 (1.7%) unicuspid valve morphologies. Of the 57 cases with bicuspid valve, 31 (54.4%) had no raphe (Sievers classification, type 0) and 26 (45.6%) were of raphe type. Although the incidence of bicuspid valve morphology was more than a third in the northern Chinese population, this was lower than the eastern Chinese population (P = 0.035), in whom the incidence was more than half. A comparison of tricuspid morphologies in China versus a Western series of 229 consecutive patients undergoing TAVR assessed with CT showed a threefold excess of leaflet calcium burden in China, with a leaflet calcium volume of 421 mm(3) (IQR, 188-688 mm(3) ) versus 142 mm(3) (IQR, 58-267 mm(3) ).

Conclusions: Patients presenting for TAVR in China have a very high frequency of bicuspid valve morphology. Even in tricuspid disease, there are clear differences to Western patients, with a high calcium burden, which presents challenges for TAVR in this population (ClinicalTrials.gov NCT01683474).

Keywords: China; TAVR; aortic Stenosis; race; transcatheter aortic valve replacement.

Publication types

  • Clinical Trial
  • Multicenter Study

MeSH terms

  • Aged
  • Aged, 80 and over
  • Aortic Valve / abnormalities*
  • Aortic Valve / diagnostic imaging
  • Aortic Valve Stenosis / diagnostic imaging*
  • Aortic Valve Stenosis / ethnology
  • Aortic Valve Stenosis / therapy*
  • Asians
  • Bicuspid Aortic Valve Disease
  • Cardiac Catheterization*
  • China / epidemiology
  • Female
  • Heart Valve Diseases / diagnostic imaging*
  • Heart Valve Diseases / ethnology
  • Heart Valve Prosthesis Implantation / methods*
  • Humans
  • Incidence
  • Male
  • Multidetector Computed Tomography*
  • Predictive Value of Tests
  • Prevalence
  • Prospective Studies
  • Severity of Illness Index

Associated data

  • ClinicalTrials.gov/NCT01683474