Heart rate variability in evaluation of the autonomic nervous system. A review

Analysis of heart rate variability is increasingly used for testing the function of the autonomic nervous system in cardiovascular disease and for the diagnosis of autonomic neuropathy. In cardiovascular disease, long-term data collection (several hours) is primarily used to describe the static activity in the different branches of the autonomic nervous system. In the diagnosis of autonomic neuropathy, short-term forced variations in heart rate are employed in order to describe the dynamic capacity of the parasympathetic nervous system. In the subsequent data-analysis several different principles may be used, and the purpose of this review is to describe these principles and their use in clinical and experimental settings.     

A botanical compound, Padma 28, increases walking distance in stable intermittent claudication

Thirty-six patients with a median age of sixty-seven years and a median duration of intermittent claudication of five years were randomized to either active treatment with Padma 28 or placebo. The effect of treatment was quantified by measurements of systemic and peripheral systolic blood pressures and by measurements of the pain-free and the maximal walking distance on a treadmill. The ankle pressure index (ankle systolic pressure/arm systolic pressure) was calculated. The group randomized to active treatment received two tablets bid containing 340 mg of a dried herbal mixture composed according to an ancient lamaistic preparation (Padma 28). After active treatments, administered over a period of four months in a double-blinded, randomized design, the patients allocated to this group attained a significant increase in the pain-free walking distance from 52 m (20-106) to 86 m (24-164; P < 0.05) and in the maximal walking distance from 115 m (72-218) to 227 m (73- > 1,000; P < 0.05). The patient-group receiving placebo treatments did not show any significant changes in either the painfree or the maximal walking distance. The authors could not demonstrate any significant changes in the ankle pressure index either during active or during placebo treatment. In conclusion, this study has shown that treatment with Padma 28 over a period of four months significantly increased the walking distance in patients with stable, intermittent claudication of long duration.     

A prospective study of age differences in consequences of emotional control in women referred to clinical mammography.

Age differences in emotional control and their consequences were examined in women referred to mammography on the suspicion of breast cancer but with benign results of the examination. Under natural experimental conditions, the levels of emotional control and distress were measured 1 week prior to the examination as well as 4 and 12 weeks after the examination in 717 younger women (ages 19–39), middle-aged women (ages 40–59), and older women (ages 60–85). A higher level of emotional control was found in the older women; this indicates that, in these birth cohorts, emotion-focused coping is more prevalent in old age than in young adulthood, even when similar stressors are experienced. The analyses revealed an interaction between age and emotional control; higher levels of control were related to a reduction in distress during the course of the study in older women, whereas emotional control was unrelated to changes in distress in younger and middle-aged women. The findings support the life span theory of control, which suggests that secondary control strategies are more adaptive in old age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)