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RATIONALE Recent literature emphasizes the utility of QT variability to study ventricular electrophysiologic function. In this investigation, we sought to test the hypothesis that beat-to-beat fluctuations in QT intervals are mediated by sympathetic activity in normal subjects using postural challenge and isoproterenol infusions. SUBJECTS AND METHODS We(More)
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(More)
We have previously reported decreased heart rate variability upon standing in panic disorder patients compared with controls. In this study, we extend our report to include patients with major depression (n = 19). Compared to normal controls (n = 20) and panic disorder patients (n = 30), there was no significant difference in the immediate changes in heart(More)
To investigate autonomic function in panic disorder patients (n = 30), we compared postural changes in heart rate and the R-R interval variance in patients and normal controls (n = 20). There was no significant difference in the immediate changes in heart rate upon standing between the groups. R-R variance was significantly decreased during resting supine(More)
We have previously found decreased standard deviations and mean consecutive differences of R-R intervals in panic disorder patients in standing posture, compared with control subjects. In the present study, we used spectral analysis of heart rate variability to examine autonomic function in 21 panic disorder patients and 21 normal control subjects. Patients(More)
Social scientists are currently being pressed upon by the legal and scientific communities to provide more definitive explanations regarding the nature and functions of memory (Loftus 1993). At the forefront of this debate is autobiographical memory. Autobiographical memory is a subclassification of memory within the declarative memory system and signifies(More)
OBJECTIVE In order to gain a broader view about the process of recruitment, we decided to compare and analyze the differences between the attitudes and views of Spanish and U.S. medical students towards psychiatry. METHODS The opinions of 151 students who had completed psychiatry at the end of their fourth year were sought on the basis of their responses(More)
We compared smoking prevalence in 217 patients with panic disorder with that in 217 age- and sex-matched control subjects who were obtained by telephone survey from the same neighborhoods. Data were obtained for current smoking habits and smoking status at either the onset of illness (patients) or 10 years previously (control subjects). Patients had been(More)