[Complex regional pain syndrome in nerve root compression and after spinal surgery]. / Komplexes regionales Schmerzsyndrom bei Nervenwurzelkompression und nach Wirbelsäulenoperation.

Complex regional pain syndrome (CRPS) is an extremely painful and partially disabling disease. It often occurs secondary to trauma, but also spontaneously. The emergence of CRPS has been reported following nerve root compression and/or spinal surgery, but its incidence is unknown. In this article, the present knowledge about the incidence of CRPS in the context of nerve root compression and spine surgery is reviewed and therapeutic and diagnostic consequences are discussed.

[Lumbar back pain in patients with Parkinson's disease]. / Lendenwirbelsäulenschmerzen bei Patienten mit Morbus Parkinson.

BACKGROUND: Lumbar back pain is a frequent symptom in patients with advanced Parkinson's disease. We examined the effect of modification of the dopaminergic medication, x-ray-controlled lumbar spine injections and analgesics combined with physiotherapy. METHODS: The data from 50 patients with Parkinson's disease and lumbar back pain were retrospectively analyzed. A structured L-dopa test was performed with all patients, whereby the pain intensity and mobility were monitored before and after the administration of L-dopa. Dopaminergic medication was adjusted in patients who reported either a reduction in pain intensity (> 20%) and/or an improvement of measured mobility and X-ray controlled lumbar spine injections were conducted in patients who reported persistent pain. Analgesics were introduced or dosages were raised in patients who had already received lumbar spine injections and continued to report pain. All patients participated in a daily physiotherapy program. RESULTS: In the L-dopa test an improvement of mobility could be demonstrated in 40 patients and reduced pain intensity in 21 patients. In 37 patients with a positive L-dopa test the dopaminergic medication was adjusted. In 12 of these patients (24%) a decrease of pain intensity could be observed. Due to persisting back pain in 30 patients lumbar spine injections were conducted. Of these patients 17 (34%) had pain improvement. In 20 patients analgesics were applied and induced pain relief in 15 patients (30%). Overall 44 patients (88%) had an improvement in pain. DISCUSSION: Even in cases of severe lumbar spine pathology adjustment of dopaminergic medication should be tested in all patients with Parkinson's disease and lumbar back pain. In patients with persistent pain facet joint injections as well as analgesics may be helpful and should be tested according to the predominant pain characteristics.

[Pain - a neglected neurological issue]. / Schmerz - ein vernachlässigtes neurologisches Thema.

Chronic pain represents a great challenge; according to epidemiological data increasing numbers of patients should be expected. Based on recent advances, a better understanding of the pathophysiology of chronic pain has been achieved and neurologists have made a major contribution to this understanding. Chronic pain is accompanied by substantial maladaptive plastic alterations in both the peripheral and central nervous systems; therefore, neurological knowledge is of paramount importance for pain therapists but this contrasts with the current treatment situation of pain patients in Germany. There are basically too few departments and practices undertaking treatment, and neurologists are an exception in most pain centers. Furthermore, due to economic reasons neurological hospitals are currently experiencing a dearth of inpatients suffering from chronic pain. Diagnostic and/or treatment procedures for neurological pain entities (e.g. headaches or neuropathic pain) are insufficiently represented in the German diagnosis-related groups (DRG) reimbursement system and the obstacles for an efficient pain therapy in neurological practices are too high. Finally, there are too few academic positions for pain medicine in neurological hospitals; therefore, career opportunities for motivated young neurologists with an interest in pain are lacking. In order to address the unmet therapeutic needs of patients with chronic pain there is a high demand for (i) establishment of departments for neurological pain medicine, (ii) modification of the German DRG system and (iii) education of young neurologists with expertise in pain. Pain medicine in particular should be especially appealing to neurologists .

Complex regional pain syndrome following spine surgery: clinical and prognostic implications.

BACKGROUND: Complex regional pain syndrome (CRPS) has been reported following spinal surgery, but its frequency after spinal surgery is unknown. The aim of this study was to determine the frequency of spinal surgery preceding CRPS and to examine these patients regarding the course of the disease and prognostic factors. METHODS: We examined 35 CRPS patients regarding the symptoms and signs of CRPS, the type of CRPS (I or II), the origin and grade of the disease, the type of surgeries prior to CRPS onset, the course of the disease, and the therapies following diagnosis of CRPS. RESULTS: In 6 patients, CRPS began during the postoperative course (lumbar spine surgery, n = 5; cervical spine surgery, n = 1). Four of these patients suffered from CRPS II. The course of the disease in the 6 patients was not different from that of patients with CRPS of other origins. First symptoms of CRPS could be observed 1-14 days after surgery. CONCLUSIONS: CRPS is a rare complication after spinal surgery, but spinal surgery precedes the onset of CRPS of the lower limb in almost one-third of the cases. The first typical symptoms of CRPS emerge within 2 weeks after spinal surgery.

[Neuropathic pain following lesions of the infrapatellar branch of the femoral nerve : an important differential diagnosis in anterior knee pain]. / Neuropathische Schmerzen nach Läsion des R. infrapatellaris des N. femoralis : Wichtige Differenzialdiagnose chronischer Knieschmerzen.

We report on two patients with neuropathic knee pain following lesions of the infrapatellar branch of the femoral nerve due to knee joint replacement. In one patient, the neuropathic pain syndrome was complicated by the development of complex regional pain syndrome (CPRS II, causalgia). Patients exhibit a sharp, burning pain, often induced by exercise, and sensory impairment in the skin area supplied by the infrapatellar nerve. This nerve is a branch of the femoral nerve medial to the fascia lata and is responsible for the skin sensation of the anterior and medial part of the knee. Clinical features, anatomy, diagnostic methods and therapeutic options are reviewed.

The plasma membrane H(+)-ATPase from the biotrophic rust fungus Uromyces fabae: molecular characterization of the gene (PMA1) and functional expression of the enzyme in yeast.

To study the molecular basis of biotrophic nutrient uptake by plant parasitic rust fungi, the gene (Uf-PMA1) encoding the plasma membrane H(+)-ATPase from Uromyces fabae was isolated. Uf-PMA1 exists probably as a single gene. However, two nearly identical sequences were identified; the similarity apparently is due to two Uf-PMA1 alleles in the dikaryotic hyphae. Multiple Uf-PMA1 transcripts were observed during early rust development, and reduced amounts of a single Uf-PMA1 mRNA were observed in haustoria and rust-infected leaves. This is in contrast to elevated enzyme activity in haustoria compared to germinated spores (C. Struck, M. Hahn, and K. Mendgen. Fungal Genet. Biol. 20:30-35, 1996). Unexpectedly, the PMA1-encoded rust protein is more similar to H(+)-ATPases from plants (55% identity) than from ascomycetous fungi (36% identity). When the rust PMA1 cDNA was expressed in Saccharomyces cerevisiae, both the wild-type enzyme and a mutant derivative (delta 76) deleted for the 76 C-terminal amino acids were able to support growth of a yeast strain lacking its own H(+)-ATPases. Compared to the wild-type, the delta 76 mutant enzyme displayed increased affinity to ATP, a higher vanadate sensitivity, and a more alkaline pH optimum. These results indicate that the C-terminal region of the rust enzyme exhibits auto-regulatory properties.

Hemisensory impairment in patients with complex regional pain syndrome.

The purpose of the present study was to investigate the extent and quality of sensory impairment and their relation to pain characteristics and movement disorders in patients suffering from complex regional pain syndrome (CRPS) type I. Neurological testing was performed independently by two examiners in 24 patients with CRPS type I. In eight patients (33%), a hemisensory impairment with decreased temperature and pinprick sensation ipsilateral to the limb affected by CRPS could be observed. In four patients (17%), a sensory deficit in the upper quadrant of the body could be demonstrated and in eight patients (33%), sensory impairment was limited to the limb affected by CRPS. Mechanical allodynia and mechanical hyperalgesia could be observed in a higher percentage of patients with hemisensory deficit or sensory impairment in the upper quadrant (92%), than in those patients with sensory impairment limited to the affected limb (17%) (P < 0.005). In patients with left-sided CRPS, sensory abnormalities in the upper quadrant or hemisensory impairment were more frequently demonstrated (77%) than in patients with right-sided CRPS (18%) (P < 0.005). There was a high correlation (92%) for the sensory findings between the two examiners, and hemisensory abnormalities were stable over a period of 3-6 months in all six patients with repeated examinations. Motor impairment (contractures, weakness, tremor or difficulties in initiating movement) could be observed in a higher percentage in patients with sensory abnormalities in the upper quadrant or hemisensory impairment (83%) than in patients with sensory impairment limited to the affected limb (42%) (P < 0.05) and was significantly correlated with allodynia/hyperalgesia (P < 0.005). The results demonstrated that sensory deficits in patients with CRPS, frequently extend past the painful area of the affected limb. The increased frequency of mechanical allodynia and movement disorders in patients with hemisensory impairment or sensory deficits in the upper quadrant, might indicate that central mechanisms are involved in the pathogenesis of CRPS in these patients.

The dread factor: how hazards and safety training influence learning and performance.

On the basis of hypotheses derived from social and experiential learning theories, we meta-analytically investigated how safety training and workplace hazards impact the development of safety knowledge and safety performance. The results were consistent with an expected interaction between the level of engagement of safety training and hazardous event/exposure severity in the promotion of safety knowledge and performance. For safety knowledge and safety performance, highly engaging training was considerably more effective than less engaging training when hazardous event/exposure severity was high, whereas highly and less engaging training had comparable levels of effectiveness when hazardous event/exposure severity was low. Implications of these findings for theory testing and incorporating information on objective risk into workplace safety research and practice are discussed.

Relative effectiveness of worker safety and health training methods.

OBJECTIVES: We sought to determine the relative effectiveness of different methods of worker safety and health training aimed at improving safety knowledge and performance and reducing negative outcomes (accidents, illnesses, and injuries). METHODS: Ninety-five quasi-experimental studies (n=20991) were included in the analysis. Three types of intervention methods were distinguished on the basis of learners' participation in the training process: least engaging (lecture, pamphlets, videos), moderately engaging (programmed instruction, feedback interventions), and most engaging (training in behavioral modeling, hands-on training). RESULTS: As training methods became more engaging (i.e., requiring trainees' active participation), workers demonstrated greater knowledge acquisition, and reductions were seen in accidents, illnesses, and injuries. All methods of training produced meaningful behavioral performance improvements. CONCLUSIONS: Training involving behavioral modeling, a substantial amount of practice, and dialogue is generally more effective than other methods of safety and health training. The present findings challenge the current emphasis on more passive computer-based and distance training methods within the public health workforce.

[Hemisensory impairment in neuropathic pain following chronic radiculopathy]. / Hemisensorische Störungen bei neuropathischen Schmerzen im Rahmen chronischer Nervenwurzelreizsyndrome.

BACKGROUND: Modern pathophysiological concepts indicate that the central nervous system is important for chronification of pain in cases of neuropathic pain. Taking these concepts into consideration, what significance then do those hemisensory disorders have that appear sporadically in cases of chronic nerve root irritation syndrome? RESULTS: The typical clinical findings are illustrated by two case reports. In addition to persistent neuropathic pain, both patients experienced hemisensory impairment of the entire side of the body ipsilateral to the radicular symptoms. Perception of sensitivity to touch, pain, and temperature was decreased on the entire side of the body in contrast to the contralateral side. CONCLUSION: Hemisensory impairment in patients with chronic nerve root irritation syndromes can indicate a functional disorder in dealing with noxious impulses in the ventral posterior nucleus of the thalamus. They represent a clinical correlative to subcortical neuroplasticity, which could explain the resistance to therapy in severe chronic pain syndromes.

[Psychological abnormalities in patients with complex regional pain syndrome (CRPS)]. / Psychische Veränderungen bei Patienten mit komplexem regionalem Schmerzsyndrom (CRPS).

QUESTION: Do comorbid psychological disorders, dysfunctional pain processing, and psychosocial pain coping occur with complex regional pain syndrome (CRPS) and is a connection between clinical and psychological manifestations apparent? METHODS: In addition to securing information on case histories and performing clinical neurological examinations of chronic CRPS patients, the structured clinical interview (SCID), pain perception scale, and the Kiel Pain Inventory were employed. RESULTS: The structured clinical interview revealed evidence of a depressive episode in 65% of CRPS patients. Pain perception is similar to neuropathic pain syndromes and patient history revealed a slightly increased frequency of anxiety and affective disorders. Depressive syndrome occurred significantly more often in right-sided CRPS; otherwise, there were no significant correlations between medical history, clinical examination, and frequency of psychological disorders. However, CRPS patients with allodynia manifest clinical signs of special psychological distress. CONCLUSION: In chronic CRPS depressive syndrome frequently develops and psychological treatment can be recommended.

[Screening study of the thyroid gland within the scope of color-coded duplex ultrasound of brain-supplying arteries]. / Die Screening-Untersuchung der Schilddrüse im Rahmen der forbkodierten Duplexsonographie hirnvessorgender Arterien.

AIM: We undertook this study to establish whether thyroid diseases influence colour-coded Duplex sonography of cerebral arteries and whether colour-coded Duplex sonography is superior to B-mode sonography in detecting pathological changes of the thyroid. METHOD: In 154 patients the thyroid gland as well as the cerebral arteries were examined by colour-coded Duplex sonography. RESULTS: In 13% of the examined carotid arteries, stenosis or occlusion was detected. Thyroid diseases were found in 21% of the examined patients. In patients with a goitre, carotid arteries were often severely displaced and thyroid vessels exhibited a low resistance waveform, easily to be confused with cerebral arteries. Colour-coded Duplex sonography provides useful information on thyroid vascularisation: however, differentiation between different types of thyroid nodules seems impossible. CONCLUSION: Investigation of the thyroid gland during colour-coded Duplex sonography of neck vessels is easy to perform. It is not time-consuming and may yield useful additional information that may help to explain the patient's complaints.

[Clinical findings in patients with chronic complex regional pain syndrome]. / Klinische Auffälligkeiten bei Patienten mit chronischem komplexen regionalen Schmerzsyndrom (sympathische Reflexdystrophie/Kausalgie).

PURPOSE: What are the clinical findings in patients with chronic complex regional pain syndrome (CRPS)? METHODS: Bedside examination was performed in 40 patients with CRPS and a mean illness duration of 43 months. To evaluate motor and autonomic disturbances, rating scales were developed and applied. Quantitative sensory testing (QST) was conducted in 24 patients. RESULTS: Clinical examination revealed sensory abnormalities in 93% of patients examined (in 56% limited to the affected limb, in 7% in the upper quadrant of the body, in 30% hemisensory impairment of the ipsilateral body side), and 60% of the patients suffered from mechanical allodynia in the affected limb. Patients with generalized sensory impairment had a significantly longer illness duration, pain intensity and significantly higher frequency of mechanical allodynia/hyperalgesia than patients with sensory deficits limited to the limb affected. In patients with generalized sensory abnormalities, QST revealed significant changes of cold, warm and touch thresholds on the ipsilateral compared to the contralateral body side. Mild/moderate motor abnormalities could be demonstrated in 45% of patients, tremor (50%), impaired joint movements, 45%, and 40% of patients revealed autonomic disturbances. CONCLUSION: In chronic CRPS, among clinical symptoms and signs, pain and sensory impairment play a major role. Mechanical allodynia reveals the highest level of subjective disability among all symptoms. With respect to hemisensory impairment, functional disturbances of central pain processing in the nucleus ventralis posterior of the thalamus are postulated.

[The sympathetic skin response--a useful method for the diagnosis of reflex sympathetic dystrophy?]. / Die sympathische Hautantwort--eine neue Methode in der Diagnostik der "sympathischen Reflexdystrophie" (Morbus Sudeck)?

UNLABELLED: The aim of the present study was to examine the value of the sympathetic skin response (SSR) in the diagnosis of reflex sympathetic dystrophy (RSD). PATIENTS AND METHODS: SSR was recorded in 20 normal subjects and in 24 patients with predominantly chronic RSD. In 3 patients with RSD, additional recordings of the SSR were performed before and several times after administration of local anaesthetics via a plexus catheter on the diseased side. SSR was recorded with standard EMG apparatus. Disc electrodes were positioned on the middle of the volar and dorsal surfaces of the hands and feet. Electrical stimuli were applied to the middle of the forehead at irregular intervals longer than 60 s. RESULTS: In normal subjects inter- and intraindividually different monophasic, biphasic and triphasic potentials without difference in the waveform between sides were recorded. SSR abnormalities were found in 15 patients with RSD and correlated with the severity of the disease. In patients with slight dystrophy SSR was predominantly normal, while in most of those with intermediate dystrophy differences in the SSR waveform between sides were observed. In the presence of severe dystrophy SSR amplitude was predominantly decreased on the affected side. Following the administration of local anaesthetics via a plexus catheter, the differences in SSR waveform became smaller in patients with initial distinct side difference of the waveform. However, differences in SSR amplitudes or latencies between sides were not affected. CONCLUSIONS: Side differences in SSR waveform could be due to a mild, reversible unilateral sudomotor dysfunction, whereas differences in SSR amplitude or latency indicate more serious damage to sudomotor activity, possibly due to dysfunction of autonomic fibres. In patients with slight dystrophy sweat secretion is predominantly normal, while in severe dystrophy more serious damage to the sweat secretory system can be observed. SSR provides useful information on sudomotor dysfunction in patients with RSD. However, as there is no consensus on the clinical criteria for diagnosis of RSD, it is also not possible to determine the diagnostic value of SSR in the diagnosis of RSD.

Sympathetic skin response in patients with reflex sympathetic dystrophy.

The sympathetic skin response (SSR) originates from synchronized activation of the sweat glands as a response to a volley discharge in efferent sympathetic nerve fibres. The aim of the study was to verify the diagnostic value of SSR in patients with reflex sympathetic dystrophy (RSD). SSR was recorded in 20 normal subjects and in 24 patients with predominantly chronic RSD. In normal subjects inter- and intra-individually different mono-, bi- and triphasic potentials could be recorded without difference of the waveform from side to side. SSR abnormalities were found in 15 patients and correlated with the severity of the disease. In patients with slight dystrophies, SSR was predominantly normal. In intermediate dystrophies, mainly differences of the SSR waveform between sides could be recorded, indicating unilateral sudomotor dysfunction. In severe dystrophies abnormalities of SSR amplitude or latency were found, indicating more serious disturbance of sudomotor activity, possibly due to a lesion of sympathetic fibres. The SSR provides useful information on sudomotor dysfunction in patients with RSD. However, as there is no consensus in the literature for the clinical criteria to diagnose RSD, it is not yet possible to determine the final diagnostic value of SSR for the diagnoses of RSD.

[Coenesthesia--an important differential diagnosis in chronic pain syndromes]. / Zönästhesie. Wichtige Differentialdiagnose bei chronischen Schmerzerkrankungen.

BACKGROUND: Coenesthesias can be defined as disorders of body perception or body hallucinations, projected in different parts of the body. Patients complain of intractable pain or dysesthesia. These symptoms are reported even from organs where we usually have no perception. Coenesthesia must be regarded as a symptom that can be observed in various psychiatric diseases, e.g., schizophrenia. However, in rare cases coenesthesias can be documented in neurological diseases, e.g., intracranial tumors or infections. Therefore, accurate assessment of possible differential diagnoses is important. In late stages, coenesthesias can easily be recognized because of their "bizarre" character. In early stages, however, patients often complain of intractable, unlocalizable burning pain. They frequently undergo operations because of their great suffering. The drug treatment of first choice is neuroleptics, but the results are unpredictable. CASES AND THERAPY: The case studies of three patients are presented and discussed (patient 1 with coenaesthetic schizophrenia, patient 2 with coenesthesia in the course of a delusional (paranoid) disorder; patient 3 with coenesthesia caused by carcinomatous meningitis).

['Frontal lobe syndrome' caused by severe head trauma or cerebrovascular diseases]. / "Frontalhirnsyndrom" nach Schädel-Hirn-Trauma oder zerebrovaskulären Erkrankungen.

The term "frontal lobe syndrome" comprises a variety of different clinical syndromes produced by focal lesions involving the prefrontal cortex. However, similar syndromes can be observed after lesions involving subcortical structures connected with the prefrontal cortex in neuronal networks. With respect to the different clinical pictures and underlying brain lesions, prefrontal lobe dysfunction may be divided into a disorganized type, caused by lesion of the dorsolateral prefrontal lobe and its connections, a disinhibited type that can be observed following lesions of the orbitofrontal cortex, and an apathetic type following lesions affecting the functional balance between the cingulum and the supplementary motor area. As intracerebral lesions are rarely limited to the brain regions described, in the majority of patients various degrees of behavioural dysfunction can be observed. The case reports of four patients illustrating the three major prefrontal syndromes following severe head injury (n = 2) or cerebrovascular disease (n = 2) are presented and diagnostic implications as well as possible treatment strategies are discussed.

[Cerebral and basilar artery thrombosis following cervical spinal injury]. / Thrombose der Vertebral- und Basilararterie nach Verletzung der Halswirbelsäule.

Vertebral artery injury may complicate cervical spine injury and may result in severe neurological impairment. We present a case of a 54 year-old male who sustained a hyperextension injury of the neck during horse-back riding with cervical spine dislocation of C3/4. As a consequence of right-sided traumatic vertebral artery thrombosis and extension of the thrombus into the basilar artery the patient developed a brainstem and bilateral cerebellar infarction with fatal outcome. In a review of the literature the characteristics of 33 cases with vertebral artery injuries following cervical spine trauma and with associated neurological complications are described. The problems of vertebral artery injury are discussed concerning diagnosis and therapy.

Carotid and vertebral artery injury following severe head or cervical spine trauma.

In order to determine the frequency of neck vessel injuries, Doppler investigations were performed in 60 patients following either severe head injury (n = 29), cervical spine injury (n = 26), or combined head and cervical spine injury (n = 5). The majority of patients were referred to our hospital for early rehabilitation; before admission Doppler investigations had been performed in only 2 patients. Clinically, 3 patients sustained severe cerebral ischemia due to neck vessel trauma: 1 patient with left-sided ICA dissection after head trauma revealed Doppler abnormalities only in the early phase of the disease; the second patient demonstrated persistent Doppler abnormalities due to traumatic right-sided ICA and VA occlusion. The third patient sustained a fatal vertebral and basilar artery thrombosis following cervical spine injury. In 57 patients without clinical signs suspicious of neck vessel trauma, sonography revealed abnormalities in 3 patients (11%) with severe head injury and in 6 patients (20%) with cervical spine or combined head and spine injury, in both groups mainly related to the vertebrobasilar system. Neck vessel injury is probably an underdiagnosed complication of severe head or cervical spine trauma. Although interpretation of Doppler findings may be difficult, particularly in the vertebrobasilar system, Doppler investigations can be recommended as a screening method to exclude neck vessel injuries.

Bilateral motor cortex disinhibition in complex regional pain syndrome (CRPS) type I of the hand.

BACKGROUND: Complex regional pain syndrome type I (CRPS I) develops as a consequence of trauma affecting the limbs, without obvious nerve lesion. Its features include pain, edema, autonomic dysfunction, movement disorder, and trophic changes. CNS involvement is suggested by the symptoms, but the pathophysiology of CRPS I is unknown. OBJECTIVE: To assess excitability changes in the motor cortex in patients with CRPS I. METHODS: The authors studied 25 patients with unilateral CRPS I involving the hand by means of transcranial magnetic stimulation using a paired-pulse paradigm. Motor threshold (MT) and intracortical inhibition and facilitation were determined on the affected and the clinically unaffected side. A control group of 20 healthy subjects was studied. RESULTS: The authors found a significant reduction of intracortical inhibition on both sides of patients with CRPS compared with control subjects, whereas intracortical facilitation and MT did not differ significantly. However, in the patients' group, the presence of allodynia significantly decreased MT. CONCLUSIONS: The authors showed a bilateral disinhibition of the motor cortex in patients with complex regional pain syndrome.