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Biomedical subjects

P Klotz

Publications and source records attributed to P Klotz.

At least 19 recordsLinked to original sources
PubMed2006

Cerebral mass in a 13-year-old girl following long-term sojourn in the Tropics.

Cysticercosis of the central nervous system is the main cause of late-onset epilepsy in tropical countries. The case of a 13-year-old German girl with a generalized seizure following long-term sojourns in the Tropics is reported. Cranial imaging showed two cerebral lesions with central calcifications. Serological, molecular and cultural examination of cerebrospinal fluid and blood was negative for various parasites, fungi and bacteria including mycobacteria. Histopathological examination after neurosurgical resection revealed calcareous bodies pathognomonic for platyhelminths, in particular tapeworms. Taken together, the radiological and histopathological findings indicate infection with cysticerci, the larvae of Taenia solium.

Adolescent↗
PubMed2001

Double-blind crossover trial of trimethoprim-sulfamethoxazole in spinocerebellar ataxia type 3/Machado-Joseph disease.

OBJECTIVE: To evaluate the efficiency of a combination of trimethoprim and sulfamethoxazole in patients with spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD). DESIGN: Placebo-controlled, double-blind crossover trial in 22 patients with genetically confirmed SCA3/MJD. Study phases of 6 months were separated by a washout period of 4 weeks. Dosages were a combination of trimethoprim, 160 mg, and sulfamethoxazole, 800 mg, twice daily for 2 weeks, followed by a combination of trimethoprim, 80 mg, and sulfamethoxazole, 400 mg, twice daily for 5.5 months. SETTING: Outpatient department of the Neurological Clinic, Ruhr-University, Bochum, Germany. MAIN OUTCOME MEASURES: Ataxia ranking scale, self-assessment score, static posturography, and results of motor performance testing. Effects on the visual system were studied using the achromatic Vision Contrast Test System and the Farnsworth-Munsell 100-hue test for color discrimination. Physical and mental health were documented using the Medical Outcomes Study 36-Item Short-Form Health Survey. Subgroup analyses assessed the influence of age, sex, age at onset, duration of the disease, phenotype, and CAG repeat length on test performance. RESULTS: Twenty of 22 patients completed the study. Dropouts were due to a rash (placebo phase) and an attempted suicide in a family conflict. Trimethoprim-sulfamethoxazole therapy had no significant effect in SCA3/MJD patients in the short-term analysis (2 weeks) or in the long-term interval (6 months). CONCLUSIONS: In contrast to previous reports that studied smaller groups of patients, treatment with trimethoprim-sulfamethoxazole did not improve the diverse and complex movement disorders caused by SCA3/MJD. Trimethoprim-sulfamethoxazole had no effect on the visual system and cannot be recommended as a continuous treatment for SCA3/MJD patients.

Adult↗
PubMed2001

Relation between electroconvulsive therapy, cognitive side effects, neuron specific enolase, and protein S-100.

OBJECTIVE: To investigate whether electroconvulsive therapy (ECT) induces brain tissue damage expressed as an increase in neuron specific enolase and protein S-100. METHODS: A total of 179 serial measurements of S-100 and NSE serum concentrations were performed on 14 patients during the course of a bilaterally stimulated ECT series. Cognitive performance was assessed by psychometric testing carried out on the day before the start of ECT as well as on the days after the third, sixth, and last ECT. Pre-ECT and post-ECT concentrations of NSE and S-100 were compared by non-parametric tests. RESULTS: On average, 9.5 (SD 2.9) (range 3-12) ECTs were applied; 13 of 14 patients received at least six ECTs. The average duration of convulsion (computed for all ECTs) was 29.0 (SD 10.5) seconds. At no point during the ECT series was there a significant increase in the average NSE or S-100 concentrations compared with the baseline investigation before the start of the ECT series. The maximal measured post-ECT values of NSE and S-100 were 26.6 ng/ml and 0.46 ng/ml, respectively. The cumulative energy doses applied, seizure durations, and ECT induced changes in cognitive performance scores were never significantly correlated with the NSE or S-100 serum concentrations. CONCLUSION: This pattern of findings suggests that a modern ECT, fulfilling current quality standards, induces no brain tissue damage detectable by changes in NSE or protein S-100.

Adult↗
PubMed2000

Motor performance: normative data, age dependence and handedness.

Quantitative, apparatus-based assessment of motor performance is a useful tool when addressing questions of therapy evaluation, quality control and early detection of movement disorders. Until now, few such methods have been sufficiently standardised to allow their routine employment in the clinic. Before assessing the impaired performance of patients, the first stage of standardisation is the determination of criteria of normal performance in healthy subjects. We have standardised a multidimensional test battery for motor performance of the upper extremities (Schoppe's "motorische Leistungs-Serie" = MLS). On the basis of the performance of 80 healthy controls, normative algorithms which allow correction of performance with reference to age were calculated. Further, our investigation provided information concerning the complexity of normal motor performance and the question of laterality (handedness). Standardised apparatus-based quantification of performance promises to be a valuable supplement to rating scales in the evaluation of patient motor skills, particularly in the early stages of their illness.

Adult↗
PubMed1998

Synthesis and glutathione S-transferase structure-affinity relationships of nonpeptide and peptidase-stable glutathione analogues.

A series of nonpeptidic glutathione analogues where the peptide bonds were replaced by simple carbon-carbon bonds or isosteric E double bonds were prepared. The optimal length for the two alkyl chains on either side of the mercaptomethyl group was evaluated using structure-affinity relationships. Affinities of the analogues 14a-f, 23, and 25 were evaluated for a recombinant GST enzyme using a new affinity chromatography method previously developed in our laboratory. Analysis of these analogues gives an additional understanding for GST affinity requirements: (a) the carbon skeleton must conserve that of glutathione since analogue 14a showed the best affinity (IC50 = 5.2 microM); (b) the GST G site is not able to accommodate a chain length elongation of one methylene group (no affinity for analogues 14c,f); (c) a one-methylene group chain length reduction is tolerated, much more for the "Glu side" (14d, IC50 = 10.1 microM) than for the "Gly side" (14b, IC50 = 1800 microM); (d) the mercaptomethyl group must remain at position 5 as shown from the null affinity of the 6-mercaptomethyl analogue 14e; (e) the additional peptide isosteric E double bond (25) or hydroxyl derivative (23) in 14e did not help to retrieve affinity. This work reveals useful information for the design of new selective nonpeptidic and peptidase-stable glutathione analogues.

Animals↗
PubMed1997

Evaluation of the Short Parkinson's Evaluation Scale: a new friendly scale for the evaluation of Parkinson's disease in clinical drug trials.

The extensive use of the Unified Parkinson's Disease Rating Scale (UPDRS) has revealed low interrater reliability in some items and redundancy in others. In view of these shortcomings, we have structured a new scale that includes a zero-to three-point scale for each item in the evaluation of PD. The mental axis includes memory, thought disorders, and depression. Activities of daily living (ADL) includes eight items: speech, eating, feeding, dressing, hygiene, handwriting, walking, and turning in bed. The motor examination includes eight items: speech, tremor, rest and posture, rigidity, finger tapping, arising from chair, gait, and postural stability. Complications of therapy were also included: dyskinesias, dystonia, motor fluctuations, and freezing episodes, collected by history. In addition, a global scoring for motor fluctuations that should complement the Hoehn and Yahr Scale was incorporated. In this report, we present a statistical analysis of the ADL, motor evaluation, and complications of therapy sections. Concerning the interrater reliability mean, Kendall's W values were >0.9 for most of the items in the Short Parkinson's Evaluation Scale (SPES). Kendall's W <0.8 (motor evaluation) was found for two items of the SPES and nine items of the UPDRS. The mean interrater reliability for both scales across all seven centers (seven Kendall's W for seven centers) (Mann-Whitney test) showed no statistical differences between the scales. Spearman's correlations between items of both scales were significant. Factor analysis of the SPES and UPDRS data revealed a four-factor solution that explained approximately 60% of the data. All participating centers found the SPES easier to apply and quicker to complete, when compared with the UPDRS. The results obtained strongly favor the introduction of SPES for clinical practice.

Activities of Daily Living↗
PubMed1996

Sustained-release of levodopa: single dose study of a new formulation.

Motor fluctuations and dyskinesias in Parkinsonian patients may be at least partially due to fluctuations of levodopa plasma concentrations. Sustained-release (SR) formulations of levodopa may present a promising, effective solution of this problem. Therefore we performed a 4-fold, cross-over double-blind trial with a new SR preparation, tested in healthy volunteers (Gerlach et al., 1988) before, in 12 Parkinsonian subjects. Two different dosages of the pure new levodopa SR-preparation, a composition of 70% SR and 30% levodopa immediate release (IR) and a conventional IR levodopa preparation were compared by their pharmacokinetic behaviour and their clinical effects. The relative bioavailability of levodopa in plasma was 69% for the combination of SR and IR levodopa release, for the pure SR formulations (100 mg levodopa) 54% and (200 mg levodopa) 55%, compared to the 100% of the standard form of IR release of 100 mg levodopa. In contrast to the conventional IR formulation the pharmacokinetic behaviour of the SR preparations showed no initial sharp peak, but more continuous and longer maintaining plasma concentrations of levodopa. Due to the small numbers of cases and the missing homogenity of the selected patients no statistical significant differences between the four preparations regarding the clinical response were observed. But the described pharmacokinetic behaviour gives hope, that these newly developed SR-preparations may lead to progress in the treatment of Parkinson's disease (prolongation of dosage intervals, reduction of motor fluctuations).

Aged↗
PubMed1996

The motor performance test series in Parkinson's disease is influenced by depression.

The Motor Performance Test Series (MPTS) is widely used for treatment control in Parkinson's disease (PD). To elucidate the possible influence of depression on the fine motor skills in PD, 54 patients with idiopathic PD were investigated with the MPTS. 27 patients with major intensity of depression were compared to 27 age and motor disability matched patients with minor symptoms of depression, evaluated by the Zung depression scale. As determined by the subtest aiming, a significant lower ability for precise, quick complex arm-hand movements in depressed Parkinsonian patients was found. This result may be explained partly by motivation deficits in depressed patients with PD. On the other hand impairment of special motor loops including frontal lobe projections to specific thalamic subnuclei or to the caudate nucleus may cause disturbances of the subtest aiming in depressed Parkinsonian patients. On the basis of these findings impaired aiming may be explained by diminished ability for complex, semivoluntary movements in depressive Parkinsonian patients. The influence of psychiatric comorbidity on MPTS subtest aiming has to be considered in further therapy studies using evaluation of motor deficits by MPTS.

Adult↗
PubMed1994

Photochemical labeling of membrane-associated and channel-forming domains of proteins directed by energy transfer.

Singlet-singlet energy transfer reactions from excited tryptophan residues to photoactivatable probes possessing a suitable chromophore, generate reactive species in the vicinity of the protein, leading to its covalent labeling. This delayed labeling process can be used to map the membrane-surrounded regions of proteins with improved efficiency when it is applied with appropriate photoactivatable phospholipids. The same principle could also be applied to the labeling of channel-forming transmembrane domains of ion channels, provided that suitable photoactivatable permeant ions were available. Both applications will be discussed with regard to their potential and feasibility.

Affinity Labels↗
PubMed1993

Disturbance of colour perception in Parkinson's disease.

A computer-aided method for the determination of colour fusion time (CFT) was developed. CFT indicates the acuity of the perception of monochromatic contours. CFT was determined in 36 patients with Parkinson's disease (PD) and compared with a group of 36 age- and sex-matched controls. Patients with PD generally had a shortened fusion time, especially for dark-green, light-blue and dark-red stimuli. The results give evidence to the hypothesis of a colour perception disorder in PD. The physiological and pathoanatomical basis of this phenomenon is unknown, but a functional deficit of cortical neurons may be a probable cause.

Adult↗
PubMed1992

Nosocomial transmission of hepatitis B virus associated with the use of a spring-loaded finger-stick device.

BACKGROUND AND METHODS: From June 1989 through March 1990, 26 patients, of whom 23 had diabetes, contracted acute hepatitis B virus (HBV) infection in a hospital in California. All 26 patients and one HBV carrier (also a diabetic) had been admitted to a single medical ward during the six months before the case patients became infected with HBV. To determine the source of the infection, we conducted a retrospective cohort study of the 72 patients with diabetes who had been admitted to the ward from January through December 1989 and a case-control study comparing the 3 nondiabetic patients who contracted hepatitis with 20 nondiabetic controls. RESULTS: The retrospective cohort study of all the patients with diabetes who were admitted to the ward during 1989 found that those who underwent capillary blood sampling by finger stick with a spring-loaded lancet device were more likely to contract HBV infection than those who did not have finger sticks (attack rate, 42 percent vs. 0 percent; P = 0.08). In addition, a dose-response relation was observed between the number of finger sticks received and the frequency of hepatitis B (P = 0.002). The case-control study found that all 3 of the nondiabetic patients who contracted hepatitis underwent finger-stick blood sampling with the device, as compared with none of the 20 nondiabetic controls (P = 0.0006). A review of nursing procedures indicated that the platform of the device was not routinely changed after each use; this finding suggested that contamination of the platform by HBV-infected blood was the mechanism of percutaneous transmission of HBV. CONCLUSIONS: Proper use of finger-stick devices as well as strict adherence to universal precautions to avoid contamination by blood are required to decrease the possibility of transmission of blood-borne pathogens among hospitalized patients.

Acute Disease↗
PubMed1992

Continuous subcutaneous lisuride infusion in OPCA.

Four patients with sporadic olivopontocerebellar atrophy (OPCA) and severe signs of Parkinsonism received continuous subcutaneous lisuride infusion via a small external pump. All 4 patients benefitted from this treatment: 3 showed an overall improvement in motor performance, in 1 patient mainly dysphagia and dysarthria improved. Therapeutic benefit lasted for at least 6 months of follow up. With a daily dose of 1.0 mg subcutaneous lisuride, treatment limitations were reached in the form of dysphagia, probably due to oropharyngeal dystonia. Subcutaneous lisuride infusion should be taken into consideration in OPCA patients with signs of Parkinsonism if oral dopaminergic treatment has failed earlier on.

Aged↗
PubMed1992

Long-term observation of chronic subcutaneous administration of lisuride in the treatment of motor fluctuations in Parkinson's disease.

Twenty-nine patients with advanced Parkinson's disease were treated with subcutaneous lisuride infusion in addition to a basic therapy consisting of levodopa + PDI in all, and deprenyl in some patients. At the time of the report, 13 patients are still receiving lisuride infusion after 5-36 months, while 16 have dropped out after 0.5-30 months: one because of psychosis, three because of insufficient efficacy, three due to death unrelated to treatment, three because of difficulties in handling the pump as outpatients, and six for other reasons. "Off"-periods and Parkinsonian disability in "off" and in "on" were reduced significantly. These improvements remained constant throughout the observation period. Once the optimal dose regimen is established, only minor adjustments of the doses of lisuride and levodopa are required in the individual case.

Aged↗
PubMed1990

Tumor necrosis factor alpha 'primes' the platelet-activating factor-induced superoxide production by human neutrophils: possible involvement of G proteins.

It has recently been demonstrated that very low concentrations of platelet-activating factor (PAF) and various cytokines can prime human neutrophils (PMN) to respond in an enhanced manner to subsequent agonistic stimulation. We were interested to ascertain whether superoxide generation by human PMN could be amplified by PAF following initial stimulation with tumor necrosis factor (TNF) and the effect of cholera and pertussis toxin on this process. PAF alone (0.1 pM-0.1 nM) failed to evoke any superoxide production; however, when PAF was added for 10 min to cells previously incubated for 50 min with 10 ng/ml TNF, superoxide production was significantly enhanced relative to that induced by TNF alone. Maximum amplification (+30%) was obtained with 10(-12) M PAF, this effect being completely abolished by BN 52021 and BN 52111, two structurally unrelated PAF antagonists. The PAF antagonists also decreased by 25% the superoxide production elicited solely by TNF, indicating that TNF-induced superoxide generation is partially mediated by a mechanism involving endogenous PAF. Pretreatment of the PMN with pertussis or cholera toxin reduced the amplification of superoxide production induced by PAF in TNF-stimulated PMN, implicating pertussis and cholera toxin-sensitive G-proteins in the amplification process.

Cholera Toxin↗
PubMed1987

Assessment of symptoms of Parkinson's disease by apparative methods.

Established clinical scores assessing the severity of Parkinson's disease show high specificity but only low interrater reliability. Using them in therapy control in multicenter studies raises typical problems. We examined the MLS, a motor performance test, in an extended form including assessment of "tapping" regularity for its practicability in therapy control of Parkinson's disease. Assessing a group of right-handed healthy controls we obtained parameters which describe normal motor dexterity by mean values, standard deviations, age relationship and correlation between left and right hand. This method is thus a good tool for estimation of abnormalities in motor dexterity. In therapy control the comparison of results obtained before and after treatment allows a good objective evaluation of the therapeutic success.

Aged↗