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• W2046833312 abstract "Although it is well recognized that dobutamine is a powerful positive inotropic agent mediating increased myocardial contractility through direct beta-adrenergic stimulation, the mechanism of its overall circulatory effects appears more complex than that which may be ascribed solely to this direct action on the myocardium. Previous investigations have implied that reflex alterations in autonomic balance may contribute significantly to the response to this agent, but direct evidence describing such a response has not been reported. The objective of this investigation was to assess changes in autonomic tone induced by dobutamine in the presence and absence of ischemia through the measurement of heart rate variability in patients undergoing dobutamine stress echocardiography. Of 25 consecutive patients undergoing dobutamine stress echocardiography, 16 were found to have unequivocal evidence for or against the presence of ischemia during dobutamine infusion. Heart rate data from these 16 patients were submitted for spectral analysis of heart rate variability and quantification of parasympathetically governed high-frequency heart rate variability and sympathetically influenced low-frequency heart rate variability. Of the 16 patients nine were not found to have evidence for ischemia (group 1), and seven were found to have echocardiographic findings consistent with dobutamine-induced ischemia (group 2). The two groups significantly differed (p = 0.04) in the change in parasympathetic tone associated with dobutamine with a significant (p = 0.04) increase in parasympathetic tone in group 1 and a numeric decrease in group 2. A significant (p = 0.04) decrease in sympathetic tone was noted in group 1 as reflected by low-frequency heart rate variability with a numeric increase in this measure in group 2.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2046833312 date "1995-11-01" @default.
• W2046833312 modified "2023-10-17" @default.
• W2046833312 title "Differing autonomic response to dobutamine in the presence and absence of ischemia: Implications for the autonomic contribution to positive inotropic intervention" @default.
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• W2046833312 doi "https://doi.org/10.1016/0002-8703(95)90208-2" @default.
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