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QT dispersion in childhood obstructive sleep apnoea syndrome

Published online by Cambridge University Press:  12 November 2010

Anant Khositseth ,
Palinee Nantarakchaikul ,
Teeradej Kuptanon  and
Aroonwan Preutthipan
Anant Khositseth*
Affiliation:
Faculty of Medicine, Department of Pediatrics, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
Palinee Nantarakchaikul
Affiliation:
Faculty of Medicine, Department of Pediatrics, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
Teeradej Kuptanon
Affiliation:
Faculty of Medicine, Department of Pediatrics, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
Aroonwan Preutthipan
Affiliation:
Faculty of Medicine, Department of Pediatrics, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
*
Correspondence to: Dr A. Khositseth, Faculty of Medicine, Department of Pediatrics, Ramathibodi Hospital, 270 Rama VI, Ratchathevee, Bangkok 10400, Thailand. Tel: 662 201 1685; Fax: 662 201 1850; E-mail: alaks@diamond.mahidol.ac.th
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Abstract

The difference between maximal and minimal QT interval and corrected QT interval defined as QT dispersion and corrected QT dispersion may represent arrhythmogenic risks. This study sought to evaluate QT dispersion and corrected QT dispersion in childhood obstructive sleep apnoea syndrome. Forty-four children (34 male) with obstructive sleep apnoea syndrome, aged 6.2 plus or minus 3.5 years along with 38 healthy children (25 male), 6.6 plus or minus 2.1 years underwent electrocardiography to measure QT and RR intervals. Means QT dispersion and corrected QT dispersion were significantly higher in obstructive sleep apnoea syndrome than controls, 52 plus or minus 27 compared to 40 plus or minus 14 milliseconds (p equal to 0.014), and 71 plus or minus 29 compared to 57 plus or minus 19 milliseconds (p equal to 0.010), respectively. Interestingly, QT dispersion and corrected QT dispersion in obstructive sleep apnoea syndrome with obesity, 57 plus or minus 30 and 73 plus or minus 31 milliseconds, were significantly higher than in control, 40 plus or minus 14 and 57 plus or minus 19 milliseconds (p equal to 0.009 and 0.043, respectively). However, QT dispersion and corrected QT dispersion in obstructive sleep apnoea syndrome without obesity, 43 plus or minus 20 and 68 plus or minus 26 milliseconds, were not significantly different. In conclusion, QT dispersion and corrected QT dispersion were significantly increased only in childhood obstructive sleep apnoea syndrome with obesity. Obesity may be the factor affecting the increased QT dispersion and corrected QT dispersion.

Keywords

Electrocardiographychildrenarrhythmia
Type
Original Articles
Information
Cardiology in the Young , Volume 21 , Issue 2 , April 2011 , pp. 130 - 135
Copyright
Copyright © Cambridge University Press 2010

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