منابع مشابه
Tilt test in essential hypertension. Differential responses in heart rate and vascular resistance.
Changes in hemodynamic parameters following 50-degree head-up tilt were studied in a population of 56 men, including 35 subjects with sustained essential hypertension and 21 age-matched normotensive controls. The increase in heart rate following tilt was similar in groups and exhibited the same reduction in response with age. The increase in vascular resistance following tilt was strongly and p...
متن کاملHeart rate response profiles during head upright tilt test in infants with apparent life threatening events.
Sympatheticovagal imbalance causing episodes of severe bradycardia has been suggested as a cause of apparent life threatening events (ALTEs). The autonomic control of the heart rate in 18 infants with ALTEs and 12 controls was evaluated by the head upright tilt test. Five different heart rate response profiles (compared with the baseline) were observed during the tilt: (1) increase followed by ...
متن کاملSpectral and symbolic analysis of heart rate data during the tilt test.
Spectral analysis of heart rate sequences is commonly used to investigate neuroauthonomic control of heart rate by means of two indexes, the low and the high frequency power. For tilt test data of normal subjects we compare the spectral indexes with new indexes defined within the framework of symbolic analysis. We define two classes of binary words of length 4: the first class is related to "ac...
متن کاملHeart rate variability analysis during head-up tilt test predicts nitroglycerine-induced syncope
OBJECTIVE The aim of this study was to determine whether or not heart rate variability (HRV) analysis during the first 20 min of head-up tilt testing could predict whether patients will develop syncope after nitroglycerine administration. DESIGN 64 patients with previous loss of consciousness underwent head-up tilt testing with the Italian protocol, which involves the administration of nitrog...
متن کاملMoxifloxacin Increases Heart Rate in Humans
(1) Background: We assessed the effect of moxifloxacin on heart rate, and reviewed the heart rate effects of other antibiotics; (2) Methods: A total of 335 normal volunteers had 12-lead electrocardiograms recorded at multiple time points before and during treatment with moxifloxacin and with placebo in seven consecutive, thorough QT studies of crossover design; (3) Results: The average baseline...
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ژورنال
عنوان ژورنال: Circulation
سال: 1998
ISSN: 0009-7322,1524-4539
DOI: 10.1161/circ.98.2.187/a