Resting blood pressure increase during exposure to a radio-frequency electromagnetic field.
Explore the source record for details and available documents.
Blood Pressure↗
Biomedical subjects
S Braune
Publications and source records attributed to S Braune.
Involvement of the esophagus in the cramp-fasciculation syndrome.
A 35-year-old male patient presented with symptoms of a cramp-fasciculation syndrome, but also reported difficulties swallowing. Esophageal manometry showed spontaneous nonperistaltic contractions, pathologically increased amplitudes and duration of the contractile complexes, and an asynchronous propagation. Electromyographic evidence of fasciculations in the sternocleidomastoid and pectoralis muscles was found. Apparently all types of peripheral motor fibers can be involved in this heterogeneous syndrome, including cranial motor nerves, the vagal nerve, and enteric motor fibers of the gastrointestinal tract.
Adult↗
Impaired cardiac uptake of meta-[123I]iodobenzylguanidine in Parkinson's disease with autonomic failure.
OBJECTIVE: To selectively investigate postganglionic sympathetic cardiac neurons in patients with Parkinson's disease and autonomic failure. MATERIAL AND METHODS: Metaiodobenzylguanidine (MIBG) is a pharmacologically inactive analogue of noradrenaline, which is similarly metabolized in noradrenergic neurons. Therefore the uptake of radiolabelled MIBG represents not only the localization of postganglionic sympathetic neurons but also their functional integrity. Ten patients with Parkinson's disease and autonomic failure underwent standardized autonomic testing, assessment of catecholamine plasma levels and scintigraphy with [123I]MIBG. RESULTS: The cardiac uptake of MIBG, as demonstrated by the heart/mediastinum ratio, was significantly lower in patients in comparison with controls. Scintigraphy with MIBG allowed the selective in-vivo investigation of postganglionic sympathetic cardiac efferents in patients with autonomic failure, a procedure which was previously confined to post-mortem examination. CONCLUSION: These findings point to a relevant postganglionic pattern of involvement of the autonomic nervous system (ANS) in Parkinson's disease and autonomic failure.
3-Iodobenzylguanidine↗
Somatostatin receptor scintigraphy in small-cell lung cancer: results of a multicenter study.
UNLABELLED: The aims of this study were to determine the accuracy of somatostatin receptor scintigraphy in the detection of the primary tumor and its metastases in small-cell lung cancer (SCLC) in a large patient population, and to investigate the course of somatostatin uptake in primary tumors during therapy. METHODS: In a total of 100 patients, 134 examinations were performed. Twenty-seven of the patients were examined before and after chemotherapy. Planar whole-body images were acquired 4 hr and 24 hr after injection of approximately 200 MBq (111)In-pentetreotide. SPECT of the thorax was performed after 24 hr. Tumor-to-background (T/B) ratios for the primary tumor were averaged from anterior and posterior projections. RESULTS: Compared to conventional investigations, somatostatin receptor scintigraphy (SRS) visualized the primary tumor with varying degrees of uptake in 96% of the examinations. Regional metastases and distant metastases were detected in 60% and 45% of the examinations, respectively. The uptake of the somatostatin analog by the primary tumor was significantly lower in the patients examined during chemotherapy as compared to those examined before treatment (T/B ratio = 1.94+/-0.79 versus 2.35+/-0.9, p < 0.005). A decrease in T/B ratio was noted in patients with remission at the time of SRS (from 2.40+/-1.56 to 1.63+/-0.72, p < 0.05). No difference in the pretreatment uptake of octreotide by the primary tumor was identified between patients with tumor progression and those with partial or complete remission. CONCLUSION: Somatostatin receptor scintigraphy has a high sensitivity in the detection of the primary tumor in SCLC but fails in the detection of metastases. Thus, SRS does not provide useful information for staging of SCLC. Since somatostatin uptake by the primary tumor is affected by chemotherapy, it may be used to follow up on the course of SCLC.
Adult↗
Stimulation of sympathetic activity by carbon dioxide in patients with autonomic failure compared to normal subjects.
In vivo studies selectively assessing preganglionic and central autonomic nervous system activity in patients with autonomic failure have so far been limited to testing pituitary function. In animal experiments carbon dioxide (CO2) selectively stimulates central sympathetic nuclei in the ventrolateral medulla and preganglionic sympathetic neurons in the cervical trunk. This central stimulation seems to overrule less pronounced peripheral vasodilatatory effects. This study addressed the question of whether hypercapnea is a suitable challenge procedure to test preganglionic and central autonomic activity in healthy subjects and in patients with autonomic failure of preganglionic and central origin. Seven patients with multiple system atrophy (MSA) and 30 age-matched healthy volunteers underwent a protocol including a Valsalva manoeuvre (VM) under normo- and hypercapnic conditions and exposure to hypercapnea under supine resting conditions. Blood pressure (BP), heart rate (HR) and end-tidal CO2 partial pressure were measured continuously and non-invasively. In normal controls hypercapnea induced significantly higher BP values in phases II, IIe, III and IV of the VM compared to the normocapnic VM and a significant increase in BP during steady-state supine exposure compared to normocapnic baseline. HR increased significantly only after 40 s of steady-state hypercapnea during the latter challenge. In patients with MSA and autonomic failure, in whom a predominantly preganglionic lesion of the autonomic nervous system is established, no significant effects of hypercapnea on the cardiovascular parameters were found. Although this non-invasive challenge procedure cannot differentiate between pre- and postganglionic autonomic failure, exposure to hypercapnea enables the investigation of efferent autonomic activity to vasoconstrictors generated from autonomic centres in the brainstem and cervical trunk.
Aged↗
Physiological, biochemical and subjective parameters in anxiety patients with panic disorder during stress exposure as compared with healthy controls.
Physiological (heart rate, blood pressure, electrodermal activity), biochemical (epinephrine, norepinephrine, cortisol) and subjective parameters (self-rating score) of 33 patients with panic disorder (diagnoses according to DSM-III-R) before, during and after stress exposure were compared with those of healthy controls. As stressors a video containing frightening scenes (FS), mental arithmetic (MA), a video documenting a patient suffering from a panic attack (PA) and an improvised speech (IS) were applied. We found significantly higher baseline levels of electrodermal activity (EDA) and norepinephrine (NE) secretion and a subsequent further increase during stress exposure in panic disorder patients as compared with normal controls. The most potent stressors during the trial proved to be mental arithmetics and improvised speech, which was evident in both groups. The situation panic attack video appeared to be a "panic disorder patient-specific" stressor; here we noticed the most pronounced reactions in the patient group. Panic disorder patients had significantly higher self-rating scores of the parameters panicky feelings, anxiety and nervousness at the beginning and throughout the investigation. We conclude that panic disorder patients have a higher degree of activation compared with normal controls, which is evident regarding levels of electrodermal activity and norepinephrine secretion. Furthermore, the panic attack video appears to be a panic disorder patient-specific stressor.
Adult↗
[Case report: decreased laying performance as a contributing problem].
In 2 laying hen flocks (housed in aviary systems) depressed performance, increased mortality and cannibalism were observed. Specific infectious diseases were excluded. The hygienic quality of the diet, however, based on self produced feed ingredients, was impaired. High concentrations of bacteria, moulds, and yeasts were found in the complete diet and also in the ingredients. These problems were eliminated by providing the birds with good quality feed ingredients. In a diagnostic feeding trial with a change in housing conditions hens showed a good performance. The poor feed quality, as demonstrated in this report, is regarded to be one of several factors, which have contributed to the problems observed in these flocks. Other negative environmental factors such as housing have to be eliminated.
Animal Feed↗
Retest variation of cardiovascular parameters in autonomic testing.
Little information is available on the methodological and physiological limits of repeatedly testing changes of blood pressure (BP) and heart rate (HR) during autonomic testing. The retest variation determines the value of follow-up investigations for the assessment of the natural course of patients with autonomic failure or the efficacy of treatment. 34 healthy volunteers between 18 and 85 years of age were tested twice within a mean period of one year (75-637 days). BP and HR were measured continuously with a Finapress device during active change of posture, passive tilt, deep breathing, Valsalva manoeuvre, isometric muscle exercise and mental arithmetic. The differences to baseline resting values before each manoeuvre were analysed. Although differences between the two occasions were comparatively small with mostly 1-7 mmHg for BP and 0.3-4 bpm for HR, the high standard deviations did not allow the calculation of useful normal ranges, as they would exceed meaningful (patho-) physiological changes over time. Therefore, a single repetition of a series of standard autonomic function tests did not appear to be suitable for follow-up observations. The calculation of the components of the coefficients of variation showed a predominance of the within variance as the cause of the poor reproducibility for the BP measurements, while changes in HR were more influenced by the between variation. The combination of the selection of some tests with a high between variance and the reduction of the within variance by performing 4, 5 retest runs can increase the reliability of standard autonomic function tests regarding follow-up assessments.
Adolescent↗
Cardiovascular parameters: sensitivity to detect autonomic dysfunction and influence of age and sex in normal subjects.
In 137 healthy volunteers between 18 and 85 years of age, blood pressure (BP) and heart rate (HR) were measured continuously with the Finapres device during active change of posture (ACP), i.e. standing upright, passive tilt (PT, i.e. head-up tilt), Valsalva manoeuvre (VM), deep breathing (DB), isometric muscle exercise (IME) and a mental arithmetic task (MA). Mean HR activation was attenuated with increasing age in all manoeuvres, but was unrelated to sex. In non-orthostatic challenge procedures like MA and IME mean BP increases were independent of age and sex, despite lower increases in HR in the elderly. This points to a preserved sympathetic efferent activity. Following a forced fall in BP during ACP, PT and VM, the initial responses and maintenance values of BP showed a significant age-related decrease. This finding was strongly related to lower BP values in males compared with females, which became more pronounced with increasing age. Further studies to investigate age-related changes in the activation of the various components of the cardiovascular regulation need to consider the mode of activation of the autonomic nervous system and sex as factors of influence. Normal ranges, and also some new points in time not previously measurable, were calculated for all standard autonomic tests based on the continuous measurement of BP and HR. The minimum length of time necessary to assess the cardiovascular responses during ACP and PT was found to be 60 s. The upper time limits for reaching maximum activation during IME and MA were 3.5 min and 1 min, respectively. Age had a relevant influence on the lower limits of normal of all HR parameters and of some BP measurements during PT, ACP and VM. Sex was found to have no relevant impact on normal ranges. Over 65 years of age the normal values for HR activation during VM and DB hardly exceeded baseline values. The possibility of increasing the sensitivity of detection of autonomic dysfunction by measuring BP continuously must be approached with caution, as sufficient sensitivity was only reached at the lower limits of normal during late phase II of the VM. The initial increase of HR after ACP and the BP values after 60 s standing time proved to be the parameters with the best sensitivity for detecting an affection of the regulation of HR and BP over the whole range of age.
Adolescent↗
[Evaluation of different broiler housing conditions on the basis of clinical, pathological, anatomical and laboratory diagnostic criteria--a summary].
In a cooperative study, the impact of different broiler housing conditions (see communication BUCHENAUER) on clinical, post-mortem and laboratory diagnostic (microbiological, parasitological, serological, immunological) parameters was investigated in the course of three different fattening period. Clinically, it was observed, that lower stocking densities allowed a relatively higher motility of the birds. On the other hand, necropsy findings, microbiological, parasitological, serological and immunological findings gave no indications that these parameters were influenced statistically significant by either one of the broiler keeping systems.
Animal Husbandry↗
Responsiveness of the somatosensory system after nerve injury and amputation in the human hand.
We studied the responsiveness of the somatosensory system in humans after prolonged deprivation of peripheral input. Eight patients with traumatic transection of the median or ulnar nerve and 6 patients with amputation of a finger or hand underwent microneurography and intraneural stimulation. Bundles of nerve fibers were electrically stimulated through a microelectrode placed in the affected nerve proximally to the site of damage or in the case of amputees, in a nerve fascicle supplying the stump. During intraneural stimulation the subjects with nerve injuries reported distinct percepts in the hypoesthetic skin. Their projections were usually confined to the territory of a single or two adjacent palmar digital nerves, similar to the fascicular territories of healthy nerves in control subjects, but there was much less microneurographically recordable afferent activity than in normal subjects. In amputees intraneural stimulation evoked sensations in a phantom digit or digits in over three fourths of the fascicles studied. We conclude that (1) the somatosensory system remains able to process information from a nerve fascicle that has lost its cutaneous territory, and (2) somatosensory localization remains accurate despite the presumed central reorganization that takes place after nerve division or amputation. This lack of functional adaptation has important implications with regard to our understanding of human central nervous system plasticity.
Adolescent↗
Psychophysiological and biochemical changes in patients with panic attacks in a defined situational arousal.
A group of 27 patients with panic disorder with or without agoraphobia were compared with 10 control subjects before stress exposure. No statistically significant differences between patients and controls were found for the cardiovascular parameters. Skin conductance level and skin conductance reaction were significantly higher in the patient group. They also showed higher self-ratings in behavioural symptoms associated with anxiety. There were statistically significant higher venous plasma levels of norepinephrine in patients than in controls, although the epinephrine levels were similar. The number of binding sites of alpha 2-receptors and the affinity of 3H-yohimbine to the alpha 2-receptors on intact thrombocytes was statistically significantly lower in patients compared to controls. Significant differences between the gender groups of patients and controls were found for electrodermal activity and epinephrine levels. These data add further evidence to an overshooting activation of the noradrenergic pathway in patients with panic disorder, possibly based on a dysregulation of alpha 2-receptor.
Adult↗
Primary antiphospholipid antibody syndrome and cerebral ischemia: report on acute intervention in two cases and literature review with emphasis on therapeutic options.
In two patients with primary antiphospholipid antibody syndrome and acute cerebrovascular ischemic events, local intraarterial fibrinolysis and intravenous heparin therapy, respectively, resulted in a limitation of persisting neurological deficits. On the basis of the 35 case reports available a combination of anticoagulation with warfarin, plus immunosuppression with steroids and/or cyclophosphamide or azathioprine, appears to be the best treatment to prevent further cerebral ischemic events. The therapeutic options are reviewed and discussed.
Adult↗
Changes in sensation after nerve injury or amputation: the role of central factors.
Dynamic changes in somatosensory cortical maps are known to occur in experimental animals subjected to peripheral nerve transection or amputation. To study the sensory effects of central nervous system adaptation to temporary or permanent loss of input from a part of the hand, multimodality quantitative sensory tests were carried out in 11 patients with complete traumatic division and repair of the median or ulnar nerves and in six patients who had undergone amputation of one or more digits. As expected, vibration, two point discrimination, and tactile thresholds were raised in the territory of the injured nerve in a graded fashion, sensitivity being poorest in the patients with the most recent injuries. Surprisingly, localisation was better in the tips than at the base of the hypoaesthetic fingers, suggesting a central attentional gradient. Stimulus-response curves conformed to a power function whose exponent was higher in denervated than in normal skin. Changes in psychophysical functions were also discernible in the intact hand. There was no hyperaesthesia in the territory of the nerve adjacent to the injured one or in the stump in the case of amputees. Central factors contribute to the sensory changes seen after nerve injury, but the functional effects of the cortical reorganisation that follows partial deafferentation are more subtle than a simple heightening of sensitivity in the surrounding skin.
Adolescent↗
Occurrence of Campylobacter spp. in young gulls, duration of Campylobacter infection and reinfection by contact.
Two groups of three week old Herring Gulls (Larus argentatus) were held to observe the carrier state with Campylobacter. All 27 birds of group I excreted Campylobacter jejuni biotype III when they were caught from their colony. Four weeks later all but one were negative, indicating that the carrier state lasts until about the seventh week of life, with self-elimination if infection with another Campylobacter species is prevented by housing in a closed environment as in this study. Only one bird became reinfected one year later when gulls from group I were brought into contact with gulls from group II, consisting of ten freshly caught gulls, four of which were infected with the same biotype of Campylobacter, indicating that there might be some kind of immunity protection against infection with the same biotype of Campylobacter spp.
Animals↗
Is ganglioside GM1 effective in the treatment of stroke?
Nine double-blind, placebo-controlled clinical trials involving 784 patients with nonhaemorrhagic stroke have been reviewed to investigate the clinical efficacy of ganglioside GM1 in this disorder. The evaluated data show a statistically significant, but transient, acceleration in recovery from neurological deficits in 63% of all GM1-treated patients during the first 2 weeks after the event compared with placebo. Both studies in which the first administration of GM1 occurred within 48 hours after stroke demonstrated a statistically significant benefit in neurological recovery for the GM1-treated patients, suggesting an advantage of early administration. However, quantitative neurological assessments of GM1- and placebo-treated patients between 2 weeks and 6 months, disability scores and mortality rates failed to show significant differences. The problems and limitations of the trials (differences in patient populations studied, lack of standardised assessment criteria, etc.) are discussed, and potential mechanisms of GM1 action and factors that influence treatment results (e.g. early administration) are evaluated.
Adult↗
[The occurrence of Campylobacter spp. and Salmonella spp. in gulls in northern Germany].
Out of a total of 207 gulls--20 Black headed gulls, 185 Herring gulls and 2 Common gulls--128 (62%) and 23 (11%) birds, respectively, were infected with Campylobacter spp. (C.) and Salmonella spp. C. jejuni was predominant in gulls less than two years old (89%) and C. coli in older birds (75%). Furthermore, the infection rate with Campylobacters was depending on the habitats of the birds. The rate for C. jejuni and C. coli, respectively, was in gulls from regional garbage dumps 78% and 4%, from the coast 58% and 21%, and from islands 47% and 47% of the isolations in the corresponding area. Salmonellae were mainly isolated in the period from September to February from gulls less than one year old and from birds from the coast.
Animals↗
[A new herpesvirus-caused disease in tortoises].
This report describes a highly fatal diphtheroid-necrotizing stomatitis in tortoises of hitherto unknown etiology. The tortoises suffered from dyspnea and anorexia, due to massive diphtheroid membranes in oral and pharyngeal cavities. Histologically, eosinophilic intranuclear inclusion bodies were found in epithelial layers of oral and tracheal mucous membranes. Furthermore, electron microscopy revealed herpesvirus like particles in affected cells. Possible environmental factors influencing the outbreak of the disease are discussed.
Animals↗