Abstract | BACKGROUND: METHODS: We measured QT and RR intervals in precordial leads (V(1)-V(6)) based on 12-beat resting ECG recordings from 16 BS patients (B group) with spontaneous ST elevation in right precordial leads (V(1)-V(2)) and from 10 patients with normal hearts (C group). We measured the response in B group before and after administration of pilsicainide (1 mg/kg). The standard deviation (QT-SD, RR-SD) of the time domain and total frequency power (QT-TP, RR-TP) were calculated for all precordial leads, and the latter was to analyze the frequency domain. RESULTS: The right precordial leads in BS exhibited an additional and prominent ST elevation (coved-type) after pilsicainide administration. Both QT-SD and QT-TP values were significantly more increased in B, than in C (5.1 +/- 1.2 vs 3.6 +/- 0.2 and 23.4 +/- 2.9 vs 12.3 +/- 1.7 msec(2), P < 0.01, respectively) and after pilsicainide administration in B. (5.1 +/- 0.4 vs 3.9 +/- 0.3, 25.8 +/- 3.4 vs 16.3 +/- 2.6 msec(2), P < 0.01, respectively) However, QT-SD and QT-TP did not significantly change in any of other leads (V(3)-V(6)) and RR-SD and RR-TP were similar for both groups, as well as after intravenous pilsicainide administration in B. CONCLUSIONS: The temporal QT interval variability was identified in BS. Moreover, sodium channel blocker induced temporal fluctuation in QT interval and it may possibly provide a substrate for ventricular arrhythmia in BS patients.
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Authors | Tetsuzou Kanemori, Hiroki Shimizu, Katsumi Oka, Yoshio Furukawa, Kenji Hiromoto, Takanao Mine, Tohru Masuyama, Mitsumasa Ohyanagi |
Journal | Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
(Ann Noninvasive Electrocardiol)
Vol. 13
Issue 1
Pg. 74-80
(Jan 2008)
ISSN: 1082-720X [Print] United States |
PMID | 18234009
(Publication Type: Controlled Clinical Trial, Journal Article)
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Chemical References |
- Sodium Channel Blockers
- Lidocaine
- pilsicainide
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Topics |
- Brugada Syndrome
(diagnosis, physiopathology)
- Electrocardiography
(drug effects, methods)
- Electrophysiologic Techniques, Cardiac
(methods, statistics & numerical data)
- Female
- Heart Rate
(drug effects)
- Humans
- Lidocaine
(analogs & derivatives, pharmacology)
- Male
- Middle Aged
- Sodium Channel Blockers
(pharmacology)
- Time Factors
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