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Monday 01 September 2003

Effect of fluoxetine, pemoline and placebo on heart period and QT variability in normal humans.

By: Pohl R, Balon R, Jayaraman A, Doll RG, Yeragani V.

J Psychosom Res 2003 Sep;55(3):247-51

OBJECTIVE: To measure the effects of fluoxetine and pemoline on heart period and QT variability. METHODS: Healthy volunteers were randomly assigned treatment with 20 mg daily of fluoxetine (n=7), 56.25 mg of pemoline (n=7) or placebo (n=9). Twenty-four-hour Holter ECGs were obtained before and after approximately 8 weeks of double-blind treatment. RESULTS: There were no significant changes in the fluoxetine group. Pemoline was associated with a significant decrease in the high frequency (HF) power (0.15-0.5 Hz, P=.02) and fractal dimension of RR time series (P=.03). QTvi, a measure of QT interval variability, increased in the pemoline group (P=.05). CONCLUSION: Pemoline, but not fluoxetine, decreases heart period variability (HPV) in the HF power, suggesting a vagolytic effect on cardiac autonomic function. Pemoline is also associated with an increase in QT interval variability, a measure that is sensitive to adrenergic agonists.

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