Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 70
Filter
1.
Eur J Pharm Biopharm ; 129: 215-221, 2018 Aug.
Article in English | MEDLINE | ID: mdl-29870747

ABSTRACT

The stability profile of a vaccine has important implications for storage, cold chain management and field deployment. The heterologous prime-boost Janssen Ebola vaccine regimen demonstrated an acceptable safety profile and durability of Ebola-specific immune responses in Phase I studies in healthy adults. Potency (infectious titre) of both components of the Ad26.ZEBOV/MVA-BN-Filo regimen were assessed using qPCR-based potency assay and flow cytometry during real-time and accelerated stability studies, conducted between -80 °C and 25 °C. Additionally, vaccine potency was assessed following agitation, temperature cycling, freeze-thawing and while in the injection system. Ad26.ZEBOV remained stable for 24 months when frozen and at 2-8 °C; MVA-BN-Filo remained stable for 24 months frozen and 12 months at 2-8 °C. Potency of both vaccines was maintained during temperature cycling, agitation and freeze-thawing. When exposed to high temperatures (up to 40 °C) in a syringe/needle both vaccines remained stable for at least 6 h. The vaccines are expected to maintain potency for 36 months when frozen (based on extrapolation of observed stability). The findings of this study indicate that the stability of the Ad26.ZEBOV/MVA-BN-Filo is likely suitable for field deployment in regions at risk of Ebola outbreaks, where cold chain maintenance is challenging owing to infrastructure and resource limitations.


Subject(s)
Disease Outbreaks/prevention & control , Drug Compounding/methods , Ebola Vaccines/pharmacology , Hemorrhagic Fever, Ebola/prevention & control , Antigens, Viral/chemistry , Antigens, Viral/immunology , Drug Stability , Drug Storage , Ebola Vaccines/chemistry , Ebola Vaccines/immunology , Ebola Vaccines/therapeutic use , Freezing , Hemorrhagic Fever, Ebola/epidemiology , Humans , Temperature
2.
Anal Chem ; 86(9): 4110-4, 2014 May 06.
Article in English | MEDLINE | ID: mdl-24650176

ABSTRACT

To optimize the quality of large scale mass-spectrometry based metabolomics data obtained from semiquantitative profiling measurements, it is important to use a strategy in which dedicated measurement designs are combined with a strict statistical quality control regime. This assures consistently high-quality results across measurements from individual studies, but semiquantitative data have been so far only comparable for samples measured within the same study. To enable comparability and integration of semiquantitative profiling data from different large scale studies over the time course of years, the measurement and quality control strategy has to be extended. We introduce a strategy to allow the integration of semiquantitative profiling data from different studies. We demonstrate that lipidomics data generated in samples from three different large biobanks acquired in the time course of 3 years can be effectively combined when using an appropriate measurement design and transfer model. This strategy paves the way toward an integrative usage of semiquantitative metabolomics data sets of multiple studies to validate biological findings in another study and/or to increase the statistical power for discovery of biomarkers or pathways by combining studies.


Subject(s)
Metabolomics , Tissue Banks , Chromatography, Liquid , Mass Spectrometry , Quality Control
3.
Psychol Med ; 43(2): 381-90, 2013 Feb.
Article in English | MEDLINE | ID: mdl-22703614

ABSTRACT

BACKGROUND: Only a minority of trauma victims (<10%) develops post-traumatic stress disorder (PTSD), suggesting that victims vary in predispositions to the PTSD response to traumas. It is assumed that the influence of predispositions is inversely related to trauma severity: when trauma is extreme predispositions are assumed to play a secondary role. This assumption has not been tested. We estimate the influence of key predispositions on PTSD induced by an extreme trauma - associated with a high percentage of PTSD - (sexual assault), relative to events of lower magnitude (accidents, disaster, and unexpected death of someone close). METHOD: The National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) is representative of the adult population of the USA. A total of 34 653 respondents completed the second wave in which lifetime PTSD was assessed. We conducted three series of multinomial logistic regressions, comparing the influence of six predispositions on the PTSD effect of sexual assault with each comparison event. Three pre-existing disorders and three parental history variables were examined. RESULTS: Predispositions predicted elevated PTSD risk among victims of sexual assault as they did among victims of comparison events. We detected no evidence that the influence of predispositions on PTSD risk was significantly lower when the event was sexual assault, relative to accidents, disasters and unexpected death of someone close. CONCLUSIONS: Important predispositions increase the risk of PTSD following sexual assault as much as they do following accidents, disaster, and unexpected death of someone close. Research on other predispositions and alternative classifications of event severity would be illuminating.


Subject(s)
Child of Impaired Parents/statistics & numerical data , Disease Susceptibility , Life Change Events , Sex Offenses/statistics & numerical data , Stress Disorders, Post-Traumatic/epidemiology , Substance-Related Disorders , Adolescent , Adult , Age Factors , Anxiety Disorders/epidemiology , Child , Data Interpretation, Statistical , Depressive Disorder/epidemiology , Female , Health Surveys , Humans , Logistic Models , Male , Risk Factors , Sex Offenses/psychology , Stress Disorders, Post-Traumatic/psychology , United States/epidemiology
4.
Diabetes Obes Metab ; 14(5): 470-8, 2012 May.
Article in English | MEDLINE | ID: mdl-22268497

ABSTRACT

AIMS: To assess the safety and tolerability of the dipeptidyl peptidase-4 inhibitor linagliptin in patients with type 2 diabetes. METHODS: Data were pooled from eight randomized, double-blind, placebo-controlled Phase III clinical trials lasting ≤24 weeks. Incidences were calculated with descriptive statistics for the overall population and for subgroups of elderly and renally impaired patients. RESULTS: A total of 2523 patients received linagliptin 5 mg once daily and 1049 patients received placebo. The overall incidence of adverse events (AEs) or serious AEs with linagliptin was similar to placebo (AEs 55.8% vs. 55.0%; serious AEs 2.8% vs. 2.7%). Overall aggregated infection incidence was 19.5% for linagliptin and 21.4% for placebo. Similar or reduced incidence of AEs versus placebo were seen with linagliptin for upper respiratory tract infection (3.3% vs. 4.9%), headache (2.9% vs. 3.1%), urinary tract infection (2.2% vs. 2.7%), blood and lymphatic disorders (1.0% vs. 1.2%), hypersensitivity (0.1% vs. 0.1%), hepatic enzyme increase (0.1% and 0.1%) and serum creatinine increase (0.0% and 0.1%). There was a slight increased frequency of nasopharyngitis (5.9% vs. 5.1%) and cough (1.7% vs. 1.0%) with linagliptin. Hypoglycaemia incidence was 8.2% for linagliptin and 5.1% for placebo; incidence was higher in patients with a background of sulphonylurea therapy (20.7% and 13.3%, respectively). In patients not receiving concomitant sulphonylurea, the hypoglycaemic incidence with linagliptin was very low in both the total population (<1%), and elderly and renally impaired patients (both <1%). CONCLUSIONS: This pooled analysis shows that linagliptin is well tolerated, with a low risk of hypoglycaemia.


Subject(s)
Blood Glucose/drug effects , Diabetes Mellitus, Type 2/drug therapy , Dipeptidyl-Peptidase IV Inhibitors/therapeutic use , Hypoglycemic Agents/therapeutic use , Purines/therapeutic use , Quinazolines/therapeutic use , Clinical Trials, Phase III as Topic , Dose-Response Relationship, Drug , Female , Humans , Linagliptin , Male , Middle Aged , Randomized Controlled Trials as Topic , Sulfonylurea Compounds/therapeutic use
5.
Cephalalgia ; 26(1): 56-63, 2006 Jan.
Article in English | MEDLINE | ID: mdl-16396667

ABSTRACT

The forearm vascular response to nitric oxide (NO) and calcitonin gene-related peptide (CGRP) was investigated in 10 migraine patients and 10 matched control subjects. Changes in forearm blood flow (FBF) during intrabrachial infusion of: (i) serotonin (releasing endogenous NO), (ii) sodium nitroprusside (SNP, exogenous NO-donor), and (iii) CGRP were measured using venous occlusion plethysmography. Flow-mediated dilation (FMD) of the brachial artery, a measure for the endogenous release of NO reactive to occlusion, was measured using ultrasound and expressed as percentage change vs. baseline diameter. FBF ratio (i.e. FBF in the infused over the control arm) at baseline (1.1 +/- 0.1) did not differ between both populations. Serotonin, SNP and CGRP induced a dose-dependent increase (P < 0.001) in FBF ratio in controls (to 2.8 +/- 0.3, 6.7 +/- 1.4 and 6.9 +/- 1.2 at the highest dose, respectively) and migraineurs (2.5 +/- 0.4, 5.6 +/- 0.8 and 6.5 +/- 1.3, respectively); these ratios did not differ between both groups. FMD was comparable in control subjects (5.8 +/- 1%) and migraine patients (5.2 +/- 1%). Based on the forearm vascular response to NO and CGRP, migraine patients do not display generalized changes in vascular function.


Subject(s)
Calcitonin Gene-Related Peptide/administration & dosage , Migraine Disorders/physiopathology , Nitric Oxide/metabolism , Regional Blood Flow/drug effects , Regional Blood Flow/physiology , Adult , Brachial Artery/physiology , Female , Forearm/blood supply , Humans , Ischemia/metabolism , Ischemia/physiopathology , Male , Migraine Disorders/etiology , Migraine Disorders/metabolism , Nitric Oxide Donors/administration & dosage , Nitroprusside/administration & dosage , Plethysmography , Serotonin/administration & dosage , Serotonin Agents/administration & dosage , Vasodilation/drug effects
6.
Eur J Neurol ; 12(9): 715-8, 2005 Sep.
Article in English | MEDLINE | ID: mdl-16128874

ABSTRACT

Dehydration is commonly believed to result in headache, but the effectiveness of increasing the water intake in patients who frequently suffer from headaches has not been studied thus far. In a pilot study, we examined the possible effects and feasibility of increased water intake in headache patients. Eighteen headache patients (all had migraine, two also had tension-type headache) were randomly allocated to placebo medication, or the advice to additionally drink 1.5 l of water per day, for a period of 12 weeks. Effect measurements consisted of a 2 weeks headache diary and the Migraine Specific Quality of Life (MSQOL) questionnaire. The advice to increase the daily fluid intake by 1.5 l increased the fluid intake in the intervention group by approximately 1 l. This reduced the total hours of headache in 2 weeks by 21 h (95% CI: -48 to 5). Mean headache intensity decreased by 13 mm (95% CI: -32 to 5) on a visual analogue scale (VAS). The effects on MSQOL, number of headache episodes, and medication seemed to be small. The data of the present study suggest a reduction in the total number of hours and intensity of headache episodes after increased water intake. Our results seem to justify larger scaled research on the effectiveness of increased water intake in headache patients.


Subject(s)
Drinking/physiology , Headache/prevention & control , Water/administration & dosage , Confidence Intervals , Double-Blind Method , Headache/physiopathology , Humans , Pain Measurement/methods , Pilot Projects , Quality of Life , Surveys and Questionnaires , Time Factors
7.
HNO ; 52(2): 156-61, 2004 Feb.
Article in German | MEDLINE | ID: mdl-14968321

ABSTRACT

The aim of our study was to establish bench-mark values for speech intelligibility in noise for children. We also considered which of the two dichotic discrimination tests, Feldmann's or Uttenweiler's, would be most suitable for use within this age group. We examined 102 children aged between 7 and 10 years (second year, primary school), with an average age of 8 years. After confirming normal hearing acuity (examination of the ear, tympanometry and audiogram), speech perception was tested. This was performed with and without noise using the Göttingen Audiometric Speech Test for Children II and the monosyllables of the Freiburger Speech Intelligibility Test. The percentage of word intelligibility was recorded. Furthermore, dichotic hearing was tested using a combination of Feldmann and Uttenweiler dichotic discrimination tests. We rated the percentage of correct word pair repetitions with the correct article. The results showed that the best method for testing speech perception in noise for this age group was the Göttingen Test II for Children. Speech perception below 70% for word intelligibility should be considered as pathologic. For testing dichotic hearing, Uttenweiler's dichotic discrimination test for children was most suitable. In this test values below 80% should be considered as pathologic.


Subject(s)
Mass Screening , Speech Discrimination Tests/methods , Vocabulary , Child , Data Interpretation, Statistical , Dichotic Listening Tests/statistics & numerical data , Female , Germany , Humans , Learning Disabilities/diagnosis , Male , Mass Screening/statistics & numerical data , Memory, Short-Term , Perceptual Masking , Reference Values , Serial Learning , Speech Discrimination Tests/statistics & numerical data , Statistics as Topic , Verbal Learning
8.
Clin Neurophysiol ; 114(12): 2326-33, 2003 Dec.
Article in English | MEDLINE | ID: mdl-14652091

ABSTRACT

OBJECTIVE: A substantial number of sarcoidosis patients report apparently non-specific symptoms such as pain, for which no organic substrate has yet been found. Recently we observed symptoms suggestive of small-fibre neuropathy in a group of sarcoidosis patients. The aim of the present study was to verify this observation using various electrophysiological tests. METHODS: In 74 sarcoidosis patients complaining of symptoms suggestive of small-fibre neuropathy, thresholds for warm (WS) and cold sensation (CS) as well as for heat pain were determined at the thenar eminence and the foot dorsum. Furthermore, sympathetic skin responses (SSR), nerve conduction studies and concentric needle electromyography were performed. In 31 patients, cardiovascular autonomic testing was carried out. RESULTS: Thermal threshold testing (TTT) revealed abnormalities in 51 of the 74 patients. Abnormalities showed an asymmetrical distribution. WS was affected more often than CS and feet more often than hands. Nerve conduction studies in the legs showed slightly abnormal results in 6 patients; all of these had abnormal TTT results. The SSR was absent at the foot in 7 patients. Cardiovascular autonomic testing was abnormal in only a single patient. CONCLUSIONS: In a subgroup of sarcoidosis patients we found TTT abnormalities suggestive of small-fibre neuropathy. SSR and cardiovascular autonomic testing appeared to be of little diagnostic value. Small-fibre neuropathy may be the cause of a number of hitherto unexplained symptoms in sarcoidosis.


Subject(s)
Peripheral Nervous System Diseases/etiology , Peripheral Nervous System Diseases/physiopathology , Sarcoidosis/complications , Sensory Thresholds , Adult , Cold Temperature , Electromyography , Female , Foot/innervation , Hot Temperature , Humans , Male , Middle Aged , Nerve Fibers, Unmyelinated/physiology , Neural Conduction , Neurons, Afferent/physiology , Neurons, Afferent/ultrastructure , Pain Threshold , Peripheral Nervous System Diseases/diagnosis , Reflex , Sympathetic Nervous System/physiopathology
9.
Methods Inf Med ; 42(4): 423-7, 2003.
Article in English | MEDLINE | ID: mdl-14534644

ABSTRACT

OBJECTIVES: To compare two clinical workstations in one hospital with respect to technical, organizational, cultural and human factors. One clinical workstation was a GUI to the HIS. The other was an electronic patient record for stroke. METHODS: Data were collected by means of in-depth interviews with end-users of both clinical workstations. The interviews were audio taped and transcribed for analysis. RESULTS: End users assessed both clinical workstations as user friendly. Coordination between health care workers was perceived to be enhanced. However, in both situations poor communication between management, implementers and users resulted in uncertainty and skepticism about future perspectives. Further-more, it appeared that inpatient and outpatient settings needed clinical workstations with different requirements for an optimal fit between work practices and information system. CONCLUSIONS: Regardless of the domain and content of a workstation, it can support coordination between disciplines. The communication concerning the information technology strategy deserves much attention. Finally, the requirements for inpatient and outpatient workstations differ.


Subject(s)
Hospital Information Systems/organization & administration , Hospitals, University/organization & administration , Medical Records Systems, Computerized/organization & administration , Attitude of Health Personnel , Attitude to Computers , Computer User Training , Efficiency, Organizational , Humans , Inservice Training , Interviews as Topic , Netherlands , Stroke/classification , User-Computer Interface
10.
Ned Tijdschr Geneeskd ; 147(28): 1372-7, 2003 Jul 12.
Article in Dutch | MEDLINE | ID: mdl-12892016

ABSTRACT

This paper describes the laborious and lengthy path to clarification and disclosure in a case of fraud in a neurological pharmaceutical clinical trial in the Netherlands. A Dutch neurologist was suspected of irregularities within the context of the 'European stroke prevention study 2' (ESPS-2), a multicentre study into medicinal prophylaxis in patients who had suffered a stroke. The Netherlands Society of Neurology (NVN) established an independent inquiry committee for further investigation of the case. The identity of 425 of the 438 patients (97%) included in the trial by the neurologist could be retrieved. The majority of these patients were known to the neurologist with cerebral infarct. For a sample of 115 patients, the general practitioners (GPs) were contacted by means of a questionnaire. Ninety percent of the responding GPs were unaware of their patients' participation in the pharmaceutical clinical trial. A total of forty patients were asked by their GP about participation: 36 (90%; 95%-CI: 76-97) indicated that they had not participated in the trial, and 4 could not remember. The committee concluded that the neurologist had committed fraud, in the sense that he had used the names of existing patients without these patients actually being enrolled in the study. The report of the independent committee was not made public; the committee and the NVN board differed in opinion on the interpretation and implications of the agreements regarding this subject. Following prolonged legal action, the regional Disciplinary Board suspended the neurologist from practice for one year and the court of law sentenced him to 180 days imprisonment or a fee of 130,000 Euro. Based on the experience gained from this case, recommendations in case of suspicion of fraud are discussed, such as the timely appointment of an independent inquiry committee and the establishment of unambiguous agreements regarding the disclosure of the results of the investigation. Possible legal implications should be considered in advance by the organisations involved; statutes should provide regulations for procedural rules. In the Netherlands there now exists a National Body for Scientific Integrity and a committee for the Scientific Integrity of Healthcare Research to prevent scientific misconduct and to stimulate reporting and appropriate handling of this problem.


Subject(s)
Clinical Trials as Topic/ethics , Ethics Committees , Neurology/ethics , Scientific Misconduct/ethics , Ethics, Research , Humans , Netherlands
11.
Acta Neurol Scand ; 108(3): 147-52, 2003 Sep.
Article in English | MEDLINE | ID: mdl-12911455

ABSTRACT

BACKGROUND: Several procedures for testing language lateralization and memory function exist during the intracarotid amobarbital test (IAT). The use of functional magnetic resonance imaging (fMRI) gives the opportunity to assess the validity of some of these procedures, or at least to inspect the neuronal correlates. A comprehensive fMRI protocol was tested, aimed at addressing aspects of lateralization of language, as well as testing memory in relation to activation of mesiotemporal regions. Here we report observations with possible consequences for the current IAT procedures. MATERIALS AND METHODS: The protocol consisted of three language tasks (overt naming, semantic decision and silent word generation) and two memory tasks (encoding and retrieving visual scenes). The paradigms used a block-related procedure in nine right-handed normal volunteers. During the procedure dynamic weighted full brain images were acquired which are sensitive to the blood oxygenation activation effect. RESULTS: Encoding showed symmetrical bilateral activation in the mesiotemporal regions, specifically the hippocampus, parahippocampal gyrus and fusiform gyrus. With a retrieval task activation of the mesiotemporal areas was restricted to the posterior hippocampal area. Overt object naming showed results, similar to encoding tasks with bilateral activation of hippocampal areas. Silent word generation showed much stronger ability to lateralize than the other two language-related tasks and especially object naming. CONCLUSION: Activation revealed by fMRI activation shows that IAT procedures, using active semantic language processing or comprehensive procedures with multiple language tasks have the highest guarantee for individual activation lateralization. Simple object naming does not guarantee a lateralized language fMRI activation pattern. Of the different memory procedures during IAT, the procedures (Interview and the Montreal) demanding encoding processing will be related to larger areas of bilateral hippocampal activation than procedures (Seattle) exclusively requiring retrieval. Moreover, tasks using recognition of previously presented language items (naming objects) are equally effective for assessing hippocampal activation compared with presenting separate memory items.


Subject(s)
Functional Laterality , Language , Magnetic Resonance Imaging/methods , Memory , Temporal Lobe/physiology , Adult , Amobarbital , Brain Mapping , Carotid Arteries , Female , Humans , Hypnotics and Sedatives , Male , Photic Stimulation , Predictive Value of Tests , Semantics , Temporal Lobe/physiopathology
12.
Pathophysiol Haemost Thromb ; 33(1): 52-8, 2003.
Article in English | MEDLINE | ID: mdl-12853713

ABSTRACT

The time course of the concentration of active thrombin in clotting plasma (the thrombogram) was measured by subsampling from platelet-rich plasma (PRP) and continuous chromogenic measurement of platelet-poor plasma (PPP) in 41 stroke patients under the age of 50, in whom stroke could not be attributed to cardioembolic disease, arterial dissection or vasculitis. A significant increase in the area under the thrombogram (endogenous thrombin potential, ETP) was seen in 23 patients. In 9 of them, ETP was increased in PRP but normal in PPP. High ETP in PRP was significantly associated with stroke, both in the middle and in the highest tercile of the ETP (odds ratio 5.1, range 1.8-15.1, and 3.7, range 1.3-10.3, respectively). A decreased sensitivity to the inhibitory action of thrombomodulin (TM) on thrombin generation was observed in 5 of 37 cases. No further definition of the cause of increased thrombin generation or TM resistance was attempted, except for the role of von Willebrand factor (vWF). ETP in PRP, platelet-derived procoagulant activity and vWF were correlated and higher in patients than in controls (p=0.002, p=0.045 and p=0.0006, respectively). This confirms the correlation between vWF level and stroke at young age found in epidemiological studies. It suggests that the role of vWF in thrombin generation, which has been demonstrated in vitro, may be the underlying mechanism of this correlation. In summary, hypercoagulability, defined as an increased capacity of the platelet plasma system to form thrombin, is found in over half of the patients under 50 years with an otherwise unexplained stroke. Sometimes it is due to increased plasma factor activity, sometimes to an increased procoagulant activity of the platelets.


Subject(s)
Blood Coagulation Tests , Brain Ischemia/blood , Thrombin/biosynthesis , Thrombophilia/blood , Adult , Age of Onset , Area Under Curve , Blood Coagulation Tests/methods , Brain Ischemia/epidemiology , Brain Ischemia/etiology , Chromogenic Compounds , Comorbidity , Humans , Middle Aged , Phospholipids/blood , Plasma , Platelet Count , Recurrence , Sensitivity and Specificity , Thrombin/analysis , Thrombomodulin/chemistry , Thrombophilia/complications , Thrombophilia/diagnosis , von Willebrand Factor/analysis , von Willebrand Factor/physiology
13.
J Am Med Inform Assoc ; 10(3): 235-43, 2003.
Article in English | MEDLINE | ID: mdl-12626373

ABSTRACT

We reviewed the English and Dutch literature on evaluations of patient care information systems that require data entry by health care professionals published from 1991 to 2001. Our objectives were to identify attributes that were used to assess the success of such systems and to test the ability of a framework developed by Delone and McLean for management information systems(1) to categorize these attributes correctly. The framework includes six dimensions or success factors: system quality, information quality, usage, user satisfaction, individual impact, and organizational impact. Thirty-three papers were selected for complete review. Types of study design included descriptive, correlational, comparative, and case studies. A variety of relevant attributes could be assigned to the six dimensions in the Delone and McLean framework, but some attributes, predominantly in cases of failure, did not fit any of the categories. They related to contingent factors, such as organizational culture. Our review points out the need for more thorough evaluations of patient care information systems that look at a wide range of factors that can affect the relative success or failure of these systems.


Subject(s)
Hospital Information Systems , Medical Records Systems, Computerized , Computer Security , Computer Systems , Consumer Behavior/statistics & numerical data , Evaluation Studies as Topic , Hospital Information Systems/standards , Hospital Information Systems/statistics & numerical data , Humans , Nursing Records , Organizational Culture , Organizational Innovation
14.
Cephalalgia ; 23(2): 96-104, 2003 Mar.
Article in English | MEDLINE | ID: mdl-12603365

ABSTRACT

As migraine is associated with an increased risk for ischaemic stroke and peripheral vasospastic disorders, it was hypothesized that interictal vascular changes may be present in migraine patients. Using ultrasound and applanation tonometry, the cardiovascular properties of migraine patients were compared with those of matched control subjects. Vascular parameters of the carotid arteries, cardiac output and systemic vascular resistance did not differ between both groups. Right temporal artery diameter was larger in migraine patients (mean difference 101 micro m; 95% confidence interval (CI) 9/194 micro m; P = 0.033). At the brachial artery, migraine patients displayed a smaller distension (difference -24 micro m; 95% CI -45/-4 micro m; P = 0.021) and a decreased compliance (difference -0.025 mm2/kPa; 95% CI -0.047/-0.003 mm2/kPa; P = 0.024). Thus, migraine patients display an increased peripheral arterial stiffness. The presence of these interictal vascular changes suggests that migraine might be part of a more generalized vascular disorder.


Subject(s)
Migraine Disorders/diagnosis , Migraine Disorders/physiopathology , Adult , Blood Pressure , Brachial Artery/diagnostic imaging , Brachial Artery/physiopathology , Brain/blood supply , Brain/physiopathology , Cardiac Output , Carotid Artery, Common/diagnostic imaging , Carotid Artery, Common/physiopathology , Cerebrovascular Circulation , Female , Femoral Artery/diagnostic imaging , Femoral Artery/physiopathology , Humans , Male , Middle Aged , Migraine Disorders/diagnostic imaging , Migraine Disorders/epidemiology , Norway/epidemiology , Temporal Arteries/diagnostic imaging , Temporal Arteries/physiopathology , Ultrasonography , Vascular Resistance
15.
Neuroradiology ; 44(8): 667-73, 2002 Aug.
Article in English | MEDLINE | ID: mdl-12185544

ABSTRACT

Our aim was to put together and test a comprehensive functional MRI (fMRI) protocol which could compete with the intracarotid amytal (IAT) or Wada test for the localisation of language and memory function in patients with intractable temporal lobe epilepsy. The protocol was designed to be performed in under 1 h on a standard 1.5 tesla imager. We used five paradigms to test nine healthy right-handed subjects: complex scene-encoding, picture-naming, reading, word-generation and semantic-decision tasks. The combination of these tasks generated two activation maps related to memory in the mesial temporal lobes, and three language-related maps of activation in a major part of the known language network. The functional maps from the encoding and naming tasks showed typical and symmetrical posterior mesial temporal lobe activation related to memory in all subjects. Only four of nine subjects also showed symmetrical anterior hippocampal activation. Language lateralisation was best with the word generation and reading paradigms and proved possible in all subjects. The reading paradigm enables localisation of language function in the left anterior temporal pole and middle temporal gyrus, areas typically resected during epilepsy surgery. The combined results of this comprehensive f MRI protocol are adequate for a comparative study with the IAT in patients with epilepsy being assessed for surgery.


Subject(s)
Epilepsy, Temporal Lobe/pathology , Epilepsy, Temporal Lobe/surgery , Magnetic Resonance Imaging , Adult , Brain/pathology , Female , Humans , Male , Pilot Projects , Preoperative Care
16.
Neuroscience ; 112(4): 751-8, 2002.
Article in English | MEDLINE | ID: mdl-12088735

ABSTRACT

The aim of our study was to investigate the effect of perinatal asphyxia on developmental apoptosis in the cervical and lumbar spinal cord in the neonatal rat. Perinatal asphyxia was induced by keeping pups at term in utero in a water bath at 37 degrees C for 20 min, followed by resuscitation. Effects of this treatment on developmental apoptosis were studied on postnatal days 2, 5 and 8 using terminal deoxynucleotidyl transferase (TdT)-dUTP-biotin nick end labelling (TUNEL) and caspase-3 staining. TUNEL positive cells were identified using double immunostaining. On postnatal day 2 an increase of 215% in TUNEL positive cells was detected (P=0.005) in laminae IV-VII of the lumbar spinal cord of rats which underwent perinatal asphyxia compared to controls. An increase of 55% compared to controls (P=0.03) was seen in laminae I-III of the lumbar spinal cord at postnatal day 8. TUNEL positive cells could be partly identified as microglia cells (ED1 positive) and oligodendrocytes (O4 positive). The effect of perinatal asphyxia on programmed cell death in the neonatal rat spinal cord was mainly observed in the intermediate zone and dorsal horn of the lumbar spinal cord. We conclude that perinatal asphyxia has a pronounced effect on the survival of cells in a specific region of the spinal cord and thus may have a profound effect on the development of motor networks.


Subject(s)
Apoptosis , Asphyxia/complications , Spinal Cord Diseases/etiology , Spinal Cord/growth & development , Spinal Cord/pathology , Animals , Animals, Newborn , Asphyxia/pathology , Cervical Vertebrae , Female , In Situ Nick-End Labeling , Lumbar Vertebrae , Male , Rats , Rats, Wistar , Spinal Cord Diseases/pathology
17.
Neurosci Lett ; 321(1-2): 120-2, 2002 Mar 15.
Article in English | MEDLINE | ID: mdl-11872270

ABSTRACT

The neurotransmitter gamma-aminobuteric acid (GABA) is believed to have a controlling action on spinal locomotor networks. In spasticity, spinal locomotor networks are thought to play a role. A well known drug in the treatment of spasticity is the GABA(B) agonist Baclofen. We report an inhibitory effect of Baclofen on the ANP-mediated cGMP synthesis in the superficial dorsal horn (laminae I-III) of the rat cervical spinal cord. This inhibitory effect of Baclofen could not be detected after incubation with the NO donor SNP. The clinical effect of Baclofen on the reduction of spasticity might be explained by an enhancement of GABAergic inhibition of ANP mediated cGMP concentration in the spinal cord dorsal horn, thus reducing afferent input.


Subject(s)
Atrial Natriuretic Factor/antagonists & inhibitors , Baclofen/pharmacology , Cyclic GMP/biosynthesis , GABA Agonists/pharmacology , Muscle Spasticity/drug therapy , Posterior Horn Cells/drug effects , Receptors, GABA-B/metabolism , gamma-Aminobutyric Acid/metabolism , Aging/metabolism , Animals , Atrial Natriuretic Factor/metabolism , Cervical Vertebrae , GABA-B Receptor Agonists , Immunohistochemistry , Male , Muscle Spasticity/metabolism , Muscle Spasticity/physiopathology , Nerve Net/drug effects , Nerve Net/growth & development , Nerve Net/metabolism , Nitric Oxide Donors/pharmacology , Nociceptors/drug effects , Nociceptors/metabolism , Pain/drug therapy , Pain/metabolism , Pain/physiopathology , Posterior Horn Cells/growth & development , Posterior Horn Cells/metabolism , Rats , Rats, Inbred Lew
18.
J Hum Hypertens ; 16(2): 111-6, 2002 Feb.
Article in English | MEDLINE | ID: mdl-11850768

ABSTRACT

Manipulation of blood pressure (BP) in acute stroke may improve outcome. Despite various studies, data on the prognostic significance of early BP in stroke remain unclear. Therefore, we studied the relationship between various BP variables in the acute phase of stroke and functional outcome at 3 months. Blood pressures were collected by reviewing BP records of 817 patients who were admitted to our stroke unit between 1987 and 1992. Besides the first systolic and diastolic admission BP (SBP and DBP), we also used the mean of the daytime as well as the night-time systolic and diastolic BP values. Finally, we studied the relationship between the decrease in BP between day 0 and 4 and outcome. As dependent outcome variable we used the Rankin handicap score at 3 months dichotomized in a score >3 (poor outcome) vs a score 3 (good outcome). A total of 430 patients were admitted within 24 h following stroke onset. There was no significant relationship between the systolic and diastolic BP and the outcome at 3 months. Only night-time systolic BP 165 mm Hg (odds ratio (OR) 2.8; 95% CI 1.1-6.8), night-time diastolic BP 60 mm Hg (OR 8.1; 95% CI 1.1-58.3), and a decrease in daytime diastolic BP between day 0 and 4 of 10 mm Hg (OR 3.0; 95% CI 1.1-7.9) showed a significant relationship with poor outcome. Our findings suggest that admission BP values may not reliably reflect any impact of BP on stroke outcome. They also suggest a potential differential effect of BP manipulation: increasing or decreasing BP may be beneficial for patients with BP extremes in one direction, but detrimental for those with BP values in the opposite direction.


Subject(s)
Hypertension/diagnosis , Hypertension/epidemiology , Stroke/epidemiology , Adult , Age Distribution , Aged , Aged, 80 and over , Blood Pressure Determination , Comorbidity , Female , Humans , Logistic Models , Male , Middle Aged , Netherlands/epidemiology , Predictive Value of Tests , Prognosis , Registries , Risk Assessment , Risk Factors , Sex Distribution , Stroke/diagnosis , Survival Rate
19.
Glia ; 37(1): 89-91, 2002 Jan.
Article in English | MEDLINE | ID: mdl-11746787

ABSTRACT

We investigated developmental apoptosis in the white matter of the cervical spinal cord at postnatal days 2, 5, and 8. Apoptotic cells were labeled using TUNEL and caspase-3 immunostaining. Apoptotic cells were diffusely distributed throughout the white matter of the spinal cord. The total amount of apoptotic cells in the cervical spinal cord white matter was related to postnatal age, with the lowest at P2 (mean 7.9, SD 5.6) and the highest at P8 (mean 109, SD 21.4). Using double immunostaining for ED-1 and O4, apoptotic cells were identified as microglia and oligodendrocytes.


Subject(s)
Aging/physiology , Apoptosis/physiology , Nerve Fibers, Myelinated/ultrastructure , Spinal Cord/cytology , Spinal Cord/growth & development , Animals , Caspase 3 , Caspases/metabolism , Ectodysplasins , In Situ Nick-End Labeling , Membrane Proteins/metabolism , Microglia/cytology , Microglia/metabolism , Nerve Fibers, Myelinated/metabolism , Oligodendroglia/cytology , Oligodendroglia/metabolism , Rats , Rats, Wistar , Spinal Cord/metabolism
20.
Int J Med Inform ; 64(2-3): 173-85, 2001 Dec.
Article in English | MEDLINE | ID: mdl-11734384

ABSTRACT

This paper reports on the role users played in the design and development of an electronic patient record. Two key users participated in the project team. All future users received questionnaires and a selection of them was interviewed. Before starting the development of the EPR, the attitude of users towards electronic record keeping, their satisfaction with the paper clinical records, their knowledge of computers, and their needs and expectations of computer applications in health care were measured by means of a questionnaire. The results of the questionnaire were supplemented with in-depth interviews. Users had a neutral attitude towards electronic record keeping. They were more positive about data entry of the paper records than data retrieval. During the development phase, but prior to the implementation of the EPR, a second questionnaire measured satisfaction with the paper records. Satisfaction appeared to be related to self-rated computer experience. Inexperienced computer users tended to be more positive about the paper records. In general, respondents did not have many expectations about electronic record keeping. A second series of interviews zoomed in on the expectations users had. Except for more concise reporting no beneficial effects of electronic record keeping were expected.


Subject(s)
Computer Literacy , Medical Records Systems, Computerized , User-Computer Interface , Adult , Anxiety , Attitude of Health Personnel , Female , Humans , Interviews as Topic , Male , Software , Surveys and Questionnaires
SELECTION OF CITATIONS
SEARCH DETAIL
...