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Exercise-induced ventricular re-polarisation changes in moderate congenital aortic valve stenosis

Published online by Cambridge University Press:  23 February 2015

Louis-Simon Beauséjour ,
Hugo Gravel ,
Wadi Mawad ,
Nagib Dahdah  and
Daniel Curnier
Louis-Simon Beauséjour
Affiliation:
Kinesiology Department, University of Montreal, Montreal, Qc, Canada
Hugo Gravel
Affiliation:
Kinesiology Department, University of Montreal, Montreal, Qc, Canada
Wadi Mawad
Affiliation:
Department of Pediatrics, Division of Cardiology, CHU Ste-Justine, University of Montreal, Montreal, Qc, Canada
Nagib Dahdah*
Affiliation:
Department of Pediatrics, Division of Cardiology, CHU Ste-Justine, University of Montreal, Montreal, Qc, Canada
Daniel Curnier
Affiliation:
Kinesiology Department, University of Montreal, Montreal, Qc, Canada
*
Correspondence to: N. Dahdah, MD, FACC, FASE, FRCPC, Service de Cardiologie Pédiatrique (CHU Ste-Justine), 3175 Chemin de la Côte-Sainte-Catherine, Montréal, Province of Québec H3T 1C5, Canada. Tel: +514 345 4931 (5403); Fax: +514 345 4896; E-mail: nagib.dahdah.hsj@ssss.gouv.qc.ca
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Abstract

Introduction

Pressure overload increases in patients with moderate aortic valvular stenosis during exercise. In the absence of symptoms, it remains difficult, however, to discriminate patients for surgery based only on pressure overload. Other parameters, such as the dispersion of ventricular re-polarisation (d-QT), which reportedly increases with the transvalvular pressure gradient, have not been fully studied in this condition.

Objective

To determine the pattern of QT and d-QT response to exercise testing in children with moderate aortic valve stenosis in order to evaluate the impact of pressure overload from an electrophysiological perspective.

Materials and methods

In all, 15 patients were compared with 15 controls paired for age (14.8±2.5 versus 14.2±1.5 years old) and gender (66.7% male). All the patients underwent exercise stress testing with 12-lead electrocardiograph recording. QT was measured from the onset of QRS to the apex (QTa) at rest, at peak exercise, and at 1 and 3 minutes upon recovery. QT was corrected using the Fridericia equation, and d-QT was calculated.

Results

Resting QTc was similar among the study groups, but increased significantly in study patients compared with the control group at maximal effort (p=0.004) and after 1 (p<0.001) and 3 (p<0.001) minutes of recovery. A significant association was identified between groups for d-QT (p=0.034), and post-hoc tests revealed a significant difference only at rest (p=0.001).

Conclusions

Ventricular re-polarisation abnormalities can be unmasked and highlighted by the assessment of electrical re-polarisation during exercise challenge in patients with asymptomatic moderate aortic valve stenosis. Using QT response to exercise could be beneficial for better optimisation of risk stratification in these patients.

Keywords

Aortic stenosisexercise testd-QTQTcventricular re-polarisation
Type
Original Articles
Information
Cardiology in the Young , Volume 26 , Issue 2 , February 2016 , pp. 298 - 305
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Copyright
© Cambridge University Press 2015 

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