Article Text

PDF
Central and peripheral arterial stiffness in patients after surgical repair of tetralogy of Fallot: implications for aortic root dilatation
  1. Y F Cheung,
  2. X Ou,
  3. S J Wong
  1. Division of Paediatric Cardiology, Department of Paediatrics and Adolescent Medicine, Grantham Hospital, The University of Hong Kong, Hong Kong, China
  1. Correspondence to:
    Dr Y F Cheung
    Division of Paediatric Cardiology, Department of Paediatrics and Adolescent Medicine, Grantham Hospital, The University of Hong Kong, 125 Wong Chuk Hang Road, Aberdeen, Hong Kong, China; xfcheung{at}hkucc.hku.hk

Abstract

Objectives: To test the hypotheses that (1) the central conduit arteries stiffen preferentially over the peripheral conduit arteries in patients with repaired tetralogy of Fallot (ToF); and (2) central arterial stiffening is related to aortic root dilatation.

Design and patients: Heart–femoral pulse wave velocity (PWV), femoral–ankle PWV, carotid augmentation index and body surface area-adjusted aortic sinotubular dimension were determined in 31 children after ToF repair and compared with those in 31 age-matched controls after left-to-right shunt repair. In addition, the PWVs and augmentation index were related to the sinotubular junction dimension.

Settings: Tertiary paediatric cardiac centre.

Results: Compared with controls, patients had significantly greater heart–femoral PWV (mean 666 (SD 151) v 587 (81) cm/s, p  =  0.021) and carotid augmentation index (−14.1 (17.0)% v −25.2 (14.6)%, p  =  0.016), whereas the right (888 (202) v 845 (207) cm/s, p  =  0.42) and left (918 (227) v 851 (215) cm/s, p  =  0.25) femoral–ankle PWVs were similar between the two groups. The sinotubular junction z score of patients was significantly greater than that of controls (4.7 (1.5) v 1.1 (1.4), p < 0.001). Univariate analysis showed that the sinotubular junction z score correlated positively with heart–femoral PWV (r  =  0.43, p  =  0.001) and carotid augmentation index (r  =  0.46, p  =  0.001). Multiple linear regression similarly identified heart–femoral PWV (β  =  0.30, p  =  0.04) and carotid augmentation index (β  =  0.31, p  =  0.04) (model R2  =  0.26) as significant determinants of sinotubular junction z score.

Conclusions: The aorta stiffens in patients with repaired ToF, which may contribute to progressive dilatation of the aortic root in the long term.

Statistics from Altmetric.com

Footnotes

  • Published Online First 14 June 2006

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.