Yeragani, VK and Rao, Radhakrishna KA and Pohl, R and Jampala, VC and Balon, R (2001) Heart rate and QT variability in children with anxiety disorders. In: Biological Psychiatry, 49 (8). 88S-88S.Full text not available from this repository. (Request a copy)
This study compared beat-to-beat heart rate and QT variability in children with anxiety disorders (n=7) and normal controls (n=15) by using an automated algorithm to compute QT intervals. An increase in QT variability appears to be associated with a higher risk for sudden cardiac death. A decrease in heart rate variability is also linked to significant cardiovascular events. Supine detrended QT variability, QT variability corrected for mean QT interval, and QTvi (a log ratio of QT variance normalized for mean QT over heart rate variability normalized for mean heart rate) were significantly higher in children with anxiety compared to controls (P<0.05). The largest Lyapunov Exponent (LLE) of heart rate time series was significantly lower (P<0.05) in children with anxiety compared to controls. These findings suggest a relative increase in sympathetic activity and a relative decrease in cardiac vagal activity in children with anxiety disorders, and are discussed in the context of the effects of tricyclics on cardiac autonomic function in children, and the rare occurrence of sudden death during tricyclic antidepressant treatment. Depression and Anxiety.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to John Wiley and Sons.|
|Department/Centre:||Division of Electrical Sciences > Electrical Communication Engineering|
|Date Deposited:||23 Jul 2009 10:38|
|Last Modified:||23 Jul 2009 10:38|
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