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• W2040796278 abstract "BACKGROUND Signal-averaged ECG is a noninvasive test designed to detect late potentials. The effects of alterations in autonomic tone on the signal-averaged ECG have not been evaluated systematically. METHODS AND RESULTS The effects of autonomic stimulation and blockade on the signal-averaged ECG were evaluated in 14 healthy subjects (8 men and 6 women; age, 28.5 +/- 4.8 years) on 2 separate days. The signal-averaged ECG was recorded at baseline and after physiological and pharmacologic beta-adrenergic stimulation (tilt, exercise, and epinephrine and isoproterenol infusions), sequential and combined beta-adrenergic and parasympathetic blockade, and alpha-adrenergic stimulation before and after parasympathetic blockade. Analysis was performed with a bidirectional filter (40-Hz high-pass). Significant changes in the signal-averaged QRS duration from baseline (105.1 +/- 12.0 milliseconds) were noted with tilt (96.8 +/- 8.8 milliseconds), tilt after double blockade (97.5 +/- 9.0 milliseconds), epinephrine (110.5 +/- 11.8 milliseconds), and isoproterenol (99.6 +/- 12.6 milliseconds). Changes in the root-mean-square voltage of the terminal 40 milliseconds and the low-amplitude (< 40 microV) signal duration paralleled the changes in the QRS duration. CONCLUSIONS The signal-averaged ECG does not measure only fixed parameters but rather is altered under a variety of physiological and pharmacologic conditions. Upright tilt leads to shortening of the QRS duration before and after autonomic blockade; thus, the decrease in QRS duration with tilt may be related to factors other than changes in autonomic tone. These findings have implications for interpretation of the results of signal-averaged ECG." @default.
• W2040796278 created "2016-06-24" @default.
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• W2040796278 date "1994-04-01" @default.
• W2040796278 modified "2023-09-26" @default.
• W2040796278 title "Assessment of effects of autonomic stimulation and blockade on the signal-averaged electrocardiogram." @default.
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• W2040796278 doi "https://doi.org/10.1161/01.cir.89.4.1656" @default.
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