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- W2010716250 abstract "Beat-to-beat QT interval variability is associated with life-threatening arrhythmias and sudden death, however, its precious mechanism and the autonomic modulation on it remains unclear. The purpose of this study was to determine the effect of drugs that modulate the autonomic nervous system on beat-to-beat QT interval.RR and QT intervals were determined for 512 consecutive beats during fixed atrial pacing with and without propranolol and automatic blockade (propranolol plus atropine) in 11 patients without structural heart disease. Studied parameters included: RR, QTpeak (QRS onset to the peak of T wave), QTend (QRS onset to the end of T wave) interval, standard deviation (SD) of the RR, QTpeak, and QTend (RR-SD, QTpeak-SD, and QTend-SD), coefficients of variation (RR- CV, QTpeak-CV, and QTend-CV) from time domain analysis, total power (TP; RR-TP, QTpeak-TP, and QTend-TP), and power spectral density of the low-frequency band (LF; RR-LF, QTpeak-LF, and QTend-LF) and the high-frequency band (HF; RR-HF, QTpeak-HF and QTend-HF).Administration of propranolol and infusion of atropine resulted in the reduction of SD, CV, TP, and HF of the QTend interval when compared to controlled atrial pacing (3.7 +/- 0.6 and 3.5 +/- 0.5 vs 4.8 +/- 1.4 ms, 0.9 +/- 0.1 and 0.9 +/- 0.1 vs 1.2 +/- 0.3%, 7.0 +/- 2.2 and 7.0 +/- 2.2 vs 13.4 +/- 8.1 ms(2), 4.2 +/- 1.4 and 4.2 +/- 1.2 vs 8.4 +/- 4.9 ms(2), respectively). Administration of propranolol and atropine did not affect RR interval or QTpeak interval indices during controlled atrial pacing.Beat-to-beat QT interval variability is affected by drugs that modulate the autonomic nervous system." @default.
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- W2010716250 date "2008-07-01" @default.
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- W2010716250 title "Beat-to-Beat QT Interval Variability Is Primarily Affected by the Autonomic Nervous System" @default.
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- W2010716250 doi "https://doi.org/10.1111/j.1542-474x.2008.00225.x" @default.
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