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  • 1
    Electronic Resource
    Electronic Resource
    Cardiovascular autonomic reflexes in mid-pregnancy (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To study the physiological responses to noninvasive cardiovascular autonomic function tests in normal pregnancy.Design Cardiovascular autonomic responses in 60 women at 22 to 29 weeks gestation and 62 nonpregnant women were investigated using the Valsalva manoeuvre as well as orthostatic, quiet breathing, deep breathing, and isometric handgrip tests.Results Compared with nonpregnant women, those who were pregnant showed significantly lower heart rate variability during normal breathing and a blunted tachycardic reaction to blowing during the Valsalva manoeuvre. The vagally controlled biphasic heart rate response to standing was also attenuated in the pregnant group.Conclusions The cardiovascular responses were blunted in mid-pregnancy indicating a decrease in parasympathetic cardiovascular control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb15217.x
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  • 2
    Electronic Resource
    Electronic Resource
    Cardiac dysrhythmias during cardiovascular autonomic reflex tests (1993)
    Springer
    Clinical autonomic research 3 (1993), S. 183-187 
    Details
    ISSN: 1619-1560
    Keywords: Cardiac dysrhythmias ; cardiovascular reflext tests ; autonomic ; myocardial infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To assess the possible dysrhythmogenic effect of cardiovascular autonomic function tests, ECG tracings of 925 consecutive subjects, taken during a battery of cardiovascular autonomic reflex tests were analyzed. The battery included the Valsalva manoeuvre, deep breathing test, orthostatic and isometric handgrip. The frequency of ventricular extrasystoles increased during or after the tests, compared with the resting phase, in 11% of healthy subjects, in 11% of diabetic subjects and in 23% of subjects with a previous myocardial infarction (p = 0.001vs healthy subjects). In patients with previous myocardial infarction, the most dysrhythmogenic individual tests were orthostatic and isometric handgrip. In nine subjects, other cardiac rhythm disturbances were detected (including nonsustained ventricular tachycardia, conduction block, and atrial fibrillation). In all cases, the dysrhythmias were asymptomatic and resolved without medical intervention. In conclusion, we consider the cardiovascular reflex test battery safe for the patient. However, due to occasional potentially significant dysrhythmias we recommend continuous monitoring of the electrocardiogram and immediate access to resuscitation facilities during cardiovascular autonomic testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01826231
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Clinical significance of the resting heart rate in the assessment of autonomic function by cardiovascular reflex tests (1995)
    Springer
    Clinical autonomic research 5 (1995), S. 61-63 
    Details
    ISSN: 1619-1560
    Keywords: Cardiovascular ; Reflex ; Autonomic ; Resting heart rate ; Methodology ; Heart rate variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of the resting heart rate on heart rate responses in standard cardiovascular autonomic function tests was studied in a sample of 845 subjects. The responses, which were calculated using instantaneous heart rate changes and R—R interval ratios, were divided into quantiles according to their absolute values. The effect of resting heart rate on each cardiovascular index was studied by linear regression analysis, first in the whole group and then in the group with responses belonging to the lowest quantile. As regards the whole group, eight out of ten indices diminished significantly with increasing resting heart rate. However, no response-attenuating effect of increasing resting heart rate could be found among the responses in the lowest quantile. Since particularly low heart rate responses in cardiovascular reflex testing are of clinical importance when autonomic neuropathy is diagnosed, it can be concluded that the usefulness of standard cardiovascular reflex test based on heart rate changes is not limited by the level of the resting heart rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01845501
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of propranolol on sleep bruxism: Hypothetical considerations based on a case study (1996)
    Springer
    Clinical autonomic research 6 (1996), S. 37-40 
    Details
    ISSN: 1619-1560
    Keywords: sleep bruxism ; masseter contraction (MC) episode ; rhythmic jaw movements (RJM) ; MC-index ; propranolol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to investigate the effect of the β-adrenergic antagonist, propranolol, on the nocturnal masseter muscle activity of a heavy sleep bruxist. Three all-night polysomnographic registrations were performed with bilateral masseter muscle EMG recordings. The first night study served as the baseline night, the second night registration was performed after total sleep deprivation and the third night registration was made with propranolol. Sleep deprivation decreased the masseter contraction (MC) index by 61% and propranolol by 72% when compared to the level of the baseline night. This preliminary observation is in line with our hypothesis suggesting a link between autonomic regulation of circulation and rhythmic activation of masticatory muscles, especially when associated with body movements during sleep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02291404
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    Paper (German National Licenses)
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