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1.
Crit Care ; 27(1): 417, 2023 10 31.
Article in English | MEDLINE | ID: mdl-37907989

ABSTRACT

BACKGROUND: Sepsis is one of the leading causes of death. Treatment attempts targeting the immune response regularly fail in clinical trials. As HCMV latency can modulate the immune response and changes the immune cell composition, we hypothesized that HCMV serostatus affects mortality in sepsis patients. METHODS: We determined the HCMV serostatus (i.e., latency) of 410 prospectively enrolled patients of the multicenter SepsisDataNet.NRW study. Patients were recruited according to the SEPSIS-3 criteria and clinical data were recorded in an observational approach. We quantified 13 cytokines at Days 1, 4, and 8 after enrollment. Proteomics data were analyzed from the plasma samples of 171 patients. RESULTS: The 30-day mortality was higher in HCMV-seropositive patients than in seronegative sepsis patients (38% vs. 25%, respectively; p = 0.008; HR, 1.656; 95% CI 1.135-2.417). This effect was observed independent of age (p = 0.010; HR, 1.673; 95% CI 1.131-2.477). The predictive value on the outcome of the increased concentrations of IL-6 was present only in the seropositive cohort (30-day mortality, 63% vs. 24%; HR 3.250; 95% CI 2.075-5.090; p < 0.001) with no significant differences in serum concentrations of IL-6 between the two groups. Procalcitonin and IL-10 exhibited the same behavior and were predictive of the outcome only in HCMV-seropositive patients. CONCLUSION: We suggest that the predictive value of inflammation-associated biomarkers should be re-evaluated with regard to the HCMV serostatus. Targeting HCMV latency might open a new approach to selecting suitable patients for individualized treatment in sepsis.


Subject(s)
Cytomegalovirus Infections , Sepsis , Humans , Cytomegalovirus , Cytomegalovirus Infections/complications , Immunity , Interleukin-6 , Sepsis/complications
2.
Unfallchirurg ; 124(8): 642-650, 2021 Aug.
Article in German | MEDLINE | ID: mdl-33245368

ABSTRACT

BACKGROUND AND OBJECTIVE: Proximal femoral fractures are common in Germany with approximately 100,000 affected patients per year. The mortality could be considerably reduced by timely treatment (<24 h). The objectives of this work were to demonstrate the prevalence of anticoagulation and associated complications in osteosynthetically treated proximal femoral fractures, the impact of anticoagulation on the preoperative period and potential optimization of perioperative anticoagulation management. MATERIAL AND METHODS: External quality control data for North Rhine-Westphalia for the years 2015-2016 were evaluated. Only cases in which a femoral fracture near the hip joint was treated osteosynthetically were analyzed. A total of 24,786 cases of femoral fractures near the hip joint were included in the study. RESULTS: In the largest subgroup with acetylsalicylic acid (ASS) medication (n = 4005) 17% underwent delayed surgery, in the second largest group with vitamin K antagonists (VKA, n = 2157) 44.6% underwent delayed surgery and in the third largest group with direct oral anticoagulant (DOACs) medication (n = 994) 18.2% underwent delayed surgery. CONCLUSION: The biggest potential of shortening the preoperative period can be found in the ASS and vitamin K antagonist subgroups (17% and 44.6% delayed surgery, respectively). The antagonization of the effect of VKA can be achieved within a short time by the administration of prothrombin complex (PPSB). Even when taking DOACs, the current common procedure of delayed surgical treatment must be critically questioned. A coagulation management should be established in the SOP. In addition to medical interventions (administration of antidotes), structures must be created that enable prompt care.


Subject(s)
Femoral Fractures , Hip Fractures , Anticoagulants , Blood Coagulation Factors , Fracture Fixation, Internal , Hip Fractures/drug therapy , Hip Fractures/surgery , Humans , Inpatients
3.
Clin Microbiol Infect ; 26(9): 1255.e1-1255.e8, 2020 Sep.
Article in English | MEDLINE | ID: mdl-32088331

ABSTRACT

OBJECTIVES: Pharmacokinetic-pharmacodynamic (PK-PD) considerations are at the heart of defining susceptibility breakpoints for antibiotic therapy. However, current approaches follow a fragmented workflow. The aim of this study was to develop an integrative pharmacometric approach to define MIC-based breakpoints for killing and suppression of resistance development for plasma and tissue sites, integrating clinical microdialysis data as well as in vitro time-kill curves and heteroresistance information, exemplified by moxifloxacin against Staphylococcus aureus and Escherichia coli. METHODS: Plasma and target site samples were collected from ten patients receiving 400 mg moxifloxacin/day. In vitro time-kill studies with three S. aureus and two E. coli strains were performed and resistant subpopulations were quantified. Using these data, a hybrid physiologically based (PB) PK model and a PK-PD model were developed, and utilized to predict site-specific breakpoints. RESULTS: For both bacterial species, the predicted MIC breakpoint for stasis at 400 mg/day was 0.25 mg/L. Less reliable killing was predicted for E. coli in subcutaneous tissues where the breakpoint was 0.125 mg/L. The breakpoint for resistance suppression was 0.06 mg/L. Notably, amplification of resistant subpopulations was highest at the clinical breakpoint of 0.25 mg/L. High-dose moxifloxacin (800 mg/day) increased all breakpoints by one MIC tier. CONCLUSIONS: An efficient pharmacometric approach to define susceptibility breakpoints was developed; this has the potential to streamline the process of breakpoint determination. Thereby, the approach provided additional insight into target site PK-PD and resistance development for moxifloxacin. Application of the approach to further drugs is warranted.


Subject(s)
Anti-Bacterial Agents/pharmacology , Escherichia coli/drug effects , Moxifloxacin/pharmacology , Staphylococcus aureus/drug effects , Anti-Bacterial Agents/metabolism , Bacteriological Techniques , Drug Resistance, Bacterial , Humans , Microbial Sensitivity Tests , Models, Biological , Moxifloxacin/metabolism
4.
Biomed Opt Express ; 5(3): 876-81, 2014 Mar 01.
Article in English | MEDLINE | ID: mdl-24688820

ABSTRACT

Optically pumped magnetometers (OPM) are a very promising alternative to the superconducting quantum interference devices (SQUIDs) used nowadays for Magnetic Field Imaging (MFI), a new method of diagnosis based on the measurement of the magnetic field of the human heart. We present a first measurement combining a multichannel OPM-sensor with an existing MFI-system resulting in a fully functional room temperature MFI-system.

5.
Cytogenet Genome Res ; 135(1): 25-32, 2011.
Article in English | MEDLINE | ID: mdl-21846970

ABSTRACT

Fat accumulation is a polygenic trait which has a significant impact on human health and animal production. Obesity is also an increasingly serious problem in dog breeding. The FTO and INSIG2 are considered as candidate genes associated with predisposition for human obesity. In this report we present a comparative genomic analysis of these 2 genes in 4 species belonging to the family Canidae - the dog and 3 species which are kept in captivity for fur production, i.e. red fox, arctic fox and Chinese raccoon dog. We cytogenetically mapped these 2 loci by FISH and compared the entire coding sequence of INSIG2 and a fragment of the coding sequence of FTO. The FTO gene was assigned to the following chromosomes: CFA2q25 (dog), VVU2q21 (red fox), ALA8q25 (arctic fox) and NPP10q24-25 (Chinese raccoon dog), while the INSIG2 was mapped to CFA19q17, VVU5p14, ALA24q15 and NPP9q22, respectively. Altogether, 29 SNPs were identified (16 in INSIG2 and 13 in FTO) and among them 2 were missense substitutions in the dog (23C/T, Thr>Met in the FTO gene and 40C/A, Arg>Ser in INSIG2). The distribution of these 2 SNPs was studied in 14 dog breeds. Two synonymous SNPs, one in the FTO gene (-28T>C in the 5'-flanking region) and one in the INSIG2 (10175C>T in intron 2), were used for the association studies in red foxes (n = 390) and suggestive evidence was observed for their association with body weight (FTO, p < 0.08) and weight of raw skin (INSIG2, p < 0.05). These associations indicate that both genes are potential candidates for growth or adipose tissue accumulation in canids. We also suggest that the 2 missense substitutions found in dogs should be studied in terms of genetic predisposition to obesity.


Subject(s)
Canidae/genetics , Cytogenetics/methods , Foxes/genetics , Intracellular Signaling Peptides and Proteins/genetics , Membrane Proteins/genetics , Obesity/genetics , Proteins/genetics , Raccoon Dogs/genetics , Adipose Tissue , Alpha-Ketoglutarate-Dependent Dioxygenase FTO , Animals , Body Weight/genetics , Chromosome Mapping , Chromosomes/chemistry , Chromosomes/genetics , Disease Models, Animal , Dogs , Genome-Wide Association Study , Humans , In Situ Hybridization, Fluorescence , Male , Obesity/pathology , Organ Size/genetics , Polymorphism, Restriction Fragment Length , Polymorphism, Single Nucleotide , Skin
6.
Klin Padiatr ; 223(5): 292-8, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21509705

ABSTRACT

BACKGROUND: The German Palivizumab Registry refers to a post-marketing observational study of palivizumab administration during 5 consecutive respiratory syncytial virus (RSV) seasons (2002/2003 -2006/2007). PATIENTS AND METHODS: The registry provided data on drug administration, risk factors for complicated RSV disease, rehospitalisation rates for infants receiving RSV prophylaxis, and parental adherence. 49608 administrations were documented in 10686 patients (average of 4.6 per patient). RESULTS: 35% of infants received >5 monthly injections. Median gestational age at birth was 29 weeks (range 23-41 weeks), median birth weight was 1350 g (range 320-6620 g), 3% were attending day care, 46% lived in a household with children <12 years, 18% were exposed to tobacco smoke at home, 10% had a family history of asthma, and 31% had congenital heart disease. The risk of serious adverse events possibly or probably related to palivizumab administration was 0.2 per 1000 administrations. According to a worst-case calculation, the rehospitalisation rate related to RSV infection was 2.5% in children who received prophylaxis. CONCLUSION: The German Palivizumab Registry provides a comprehensive dataset describing the use of palivizumab in Germany from 2002 to 2007, and areas for improvement identified in this registry can be applied to enhance the use of palivizumab in the future.


Subject(s)
Antibodies, Monoclonal, Humanized/administration & dosage , Antiviral Agents/administration & dosage , Immunization, Passive/methods , Infant, Extremely Low Birth Weight , Infant, Premature, Diseases/prevention & control , Infant, Very Low Birth Weight , Respiratory Syncytial Virus Infections/prevention & control , Antibodies, Monoclonal, Humanized/adverse effects , Antiviral Agents/adverse effects , Child , Child, Preschool , Clinical Trials as Topic , Comorbidity , Drug Administration Schedule , Female , Germany , Humans , Infant , Infant, Newborn , Infant, Premature, Diseases/immunology , Injections, Intramuscular , Medication Adherence , Palivizumab , Patient Readmission , Pregnancy , Product Surveillance, Postmarketing , Registries , Respiratory Syncytial Virus Infections/immunology , Risk Factors , Treatment Outcome
7.
Pneumologie ; 63(1): 10-3, 2009 Jan.
Article in German | MEDLINE | ID: mdl-18777467

ABSTRACT

This is a case report about a 66-year old man with recurrent pulmonary embolisms. Phlebography revealed a monstrous venous aneurysm of the right chest wall with several venous dilatations and calcification as the source of the embolism. Radiological embolisation and surgical ligation of the large aneurysmatic neck were performed. No further embolism episodes were registered under anticoagulation during the 23 months of the postoperative follow-up investigation.


Subject(s)
Aneurysm/diagnosis , Dyspnea/etiology , Pulmonary Embolism/etiology , Vena Cava, Superior , Aged , Anticoagulants/therapeutic use , Chest Pain/etiology , Humans , Male , Radiography, Thoracic , Thorax , Tomography, X-Ray Computed , Venous Insufficiency
8.
Ned Tijdschr Geneeskd ; 148(20): 995-7, 2004 May 15.
Article in Dutch | MEDLINE | ID: mdl-15181725

ABSTRACT

Two women with breast cancer, 59 and 72 years of age, were treated by means of breast-conserving surgery and radiotherapy. At the age of 66 and 77, respectively, discolouration of the skin was seen in the treated breast. Punch biopsy did not show secondary malignancy. Diagnostic (deeper) excisional biopsy revealed angiosarcoma. Ablation of the breast was performed in both patients. The younger woman, however, had a recurrence four months later that was treated with wide local excision and omentum-plasty. The older woman died two years after the ablation as a result of haematogenous metastases. Knowledge of the symptoms and diagnostic pitfalls of radiotherapy-induced angiosarcoma after breast-conserving treatment is important in the follow-up of breast-cancer patients. Histological diagnosis of a biopsy taken at sufficient depth is indicated when a secondary angiosarcoma is suspected.


Subject(s)
Breast Neoplasms/surgery , Hemangiosarcoma/diagnosis , Mastectomy, Segmental , Neoplasms, Radiation-Induced/diagnosis , Neoplasms, Second Primary/diagnosis , Aged , Breast Neoplasms/pathology , Breast Neoplasms/radiotherapy , Combined Modality Therapy , Fatal Outcome , Female , Hemangiosarcoma/pathology , Hemangiosarcoma/surgery , Humans , Middle Aged , Neoplasm Recurrence, Local/diagnosis , Neoplasm Recurrence, Local/pathology , Neoplasms, Radiation-Induced/pathology , Neoplasms, Radiation-Induced/surgery , Neoplasms, Second Primary/pathology , Neoplasms, Second Primary/surgery , Postoperative Complications , Radiotherapy, Adjuvant/adverse effects , Reoperation
9.
Diabet Med ; 21(2): 114-21, 2004 Feb.
Article in English | MEDLINE | ID: mdl-14984445

ABSTRACT

AIMS: To determine the efficacy and safety of 600 mg of alpha-lipoic acid given intravenously over 3 weeks in diabetic patients with symptomatic polyneuropathy. METHODS: We searched the database of VIATRIS GmbH, Frankfurt, Germany, for clinical trials of alpha-lipoic acid according to the following prerequisites: randomized, double-masked, placebo-controlled, parallel-group trial using alpha-lipoic acid infusions of 600 mg i.v. per day for 3 weeks, except for weekends, in diabetic patients with positive sensory symptoms of polyneuropathy which were scored by the Total Symptom Score (TSS) in the feet on a daily basis. Four trials (ALADIN I, ALADIN III, SYDNEY, NATHAN II) comprised n=1258 patients (alpha-lipoic acid n=716; placebo n=542) met these eligibility criteria and were included in a meta-analysis based on the intention-to-treat principle. Primary analysis involved a comparison of the differences in TSS from baseline to the end of i.v. Treatment between the groups treated with alpha-lipoic acid or placebo. Secondary analyses included daily changes in TSS, responder rates (> or =50% improvement in TSS), individual TSS components, Neuropathy Impairment Score (NIS), NIS of the lower limbs (NIS-LL), individual NIS-LL components, and the rates of adverse events. RESULTS: After 3 weeks the relative difference in favour of alpha-lipoic acid vs. placebo was 24.1% (13.5, 33.4) (geometric mean with 95% confidence interval) for TSS and 16.0% (5.7, 25.2) for NIS-LL. The responder rates were 52.7% in patients treated with alpha-lipoic acid and 36.9% in those on placebo (P<0.05). On a daily basis there was a continuous increase in the magnitude of TSS improvement in favour of alpha-lipoic acid vs. placebo which was noted first after 8 days of treatment. Among the individual components of the TSS, pain, burning, and numbness decreased in favour of alpha-lipoic acid compared with placebo, while among the NIS-LL components pin-prick and touch-pressure sensation as well as ankle reflexes were improved in favour of alpha-lipoic acid after 3 weeks. The rates of adverse events did not differ between the groups. CONCLUSIONS: The results of this meta-analysis provide evidence that treatment with alpha-lipoic acid (600 mg/day i.v.) over 3 weeks is safe and significantly improves both positive neuropathic symptoms and neuropathic deficits to a clinically meaningful degree in diabetic patients with symptomatic polyneuropathy.


Subject(s)
Antioxidants/therapeutic use , Diabetic Neuropathies/drug therapy , Thioctic Acid/therapeutic use , Double-Blind Method , Female , Humans , Male , Middle Aged , Randomized Controlled Trials as Topic , Treatment Outcome
10.
Neurol Clin Neurophysiol ; 2004: 65, 2004 Nov 30.
Article in English | MEDLINE | ID: mdl-16012661

ABSTRACT

Since the high costs of common large array SQUID system may hinder widespread application of fetal magnetoencephalography (fMEG) and magnetocardiography (fMCG), we intended to investigate a small non-commercial 3-channel SQUID system. The system comprises 3 axial first order gradiometers with 7 cm base length, 2 cm diameter and 2x2 windings of niobium wire, dc-SQUIDs (UJ-111), and current locked mode SQUID electronics that form an equal length triangle (22.5 mm). The system is mounted in a Cryostat BFH-7 model 16 with 5 mm "warm"-"cold" distance. System noise is about 10 fT/Hz1/2. The fMEG and fMCG were recorded between 29 - 40 weeks of gestation after sonographic localization of the fetal head and heart using a 31-channel biomagnetometer (Philips) and the 3-channel-system, both in the same magnetically shielded room. The fMEG was recorded continuously over 500 sec (500 auditory stimuli, 100 dB SPL, 500 Hz, 50 ms, ISI 0.8-1.2/1.6-2.4 sec, trigger channel, maternal ECG lead, sampling rate 1 kHz). The fMCG was recorded over a period of 5 minutes after dewar readjustment. The detection rates of cortical auditory evoked responses (CAER) reached 100 % for both systems. Cross confirmation of the components was difficult and may have uncovered false positive component detection. The fMCG was characterized by a systematic increase in SNR under application of the smaller device. The small size array provides a profitable alternative for the fetal applications.


Subject(s)
Cardiotocography/instrumentation , Magnetics/instrumentation , Magnetoencephalography/instrumentation , Cardiotocography/methods , Female , Fetus/physiology , Humans , Magnetoencephalography/methods , Pregnancy , Research Design
11.
Physiol Meas ; 24(3): 661-9, 2003 Aug.
Article in English | MEDLINE | ID: mdl-14509304

ABSTRACT

Biomagnetic measurement performed outside a magnetically shielded room is subject to distortion by strong magnetic fields. Reducing such disturbances can enhance and stabilize biomagnetic measurement conditions in the absence of passive shielding. We have developed an active magnetic shielding system that produces both homogeneous and spatial gradient magnetic fields. The system is composed of anisotropic magnetoresistive sensors, a digital signal processor controller and two different coil systems. In order to improve the measurement environment for a first-order gradient coil SQUID system, the disturbing vertical magnetic fields and vertical field gradients are reduced, thus achieving a shielding factor of approximately 6 at 100 Hz. Our system provides a more flexible and less costly alternative to magnetically shielded rooms.


Subject(s)
Electromagnetic Fields , Electromagnetic Phenomena/instrumentation , Heart/physiology , Magnetics/instrumentation , Artifacts , Cost Savings , Electromagnetic Phenomena/economics , Humans
12.
Biomed Tech (Berl) ; 48(1-2): 2-10, 2003.
Article in English | MEDLINE | ID: mdl-12655842

ABSTRACT

Magnetic field sensors are used in various fields of technology. In the past few years a large variety of magnetic field sensors has been established and the performance of these sensors has been improved enormously. In this review article all recent developments in the area of sensitive magnetic field sensory analysis (resolution better than 1 nT) are presented and examined regarding their parameters. This is mainly done under the aspect of application fields in biomedical engineering. A comparison of all commercial and available sensitive magnetic field sensors shows current and prospective ranges of application.


Subject(s)
Electrocardiography/instrumentation , Electrodes , Magnetics/instrumentation , Magnetoencephalography/instrumentation , Biomedical Engineering , Equipment Design , Humans , Sensitivity and Specificity
13.
Presse Med ; 32(3): 134-40, 2003 Jan 25.
Article in French | MEDLINE | ID: mdl-12610386

ABSTRACT

EPIDEMIOLOGY: Presently representing 15 to 30% of new cases of breast cancer, ductal carcinomas in situ do not have specific epidemiological characteristics. The age at which they occur is between 49 and 54 years. DIAGNOSTIC METHODS: The diagnosis is evoked primarily when confronted with an area of micro-calcifications discovered on a mammography. Needle aspiration cytology, useful in cases of palpable abnormalities or infra-clinical masses, is of no interest in isolated micro-calcifications for which surgical biopsy following radiological localisation is the technique of choice. Needle micro-biopsy permits collecting analysable tissue for histological but not cytological examination. Macro-biopsies combine stereotaxic localisation of micro-calcification areas and their excision when isolated. The choice of the method varies depending on the case. FROM AN ANATOMOPATHOLOGICAL POINT OF VIEW: Ductal or intra-galactophoric carcinomas are carcinomas of the glactophores that do not infiltrate the connective tissue. They are defined histologically by architectural and cytological characteristics, which differentiate them from lobular carcinomas in situ. They constitute a group of heterogenic lesions not only morphologically but also histologically and with regard to their progression. THERAPEUTIC MODALITIES: The aim of treatment is to ensure that the patients have a maximum of chances of cure at the cost of the least possible therapeutic consequences. Mastectomy, treatment of choice for many years, is still recommended in certain situations. In other cases, conservative treatment is possible so long as excision of the micro-calcifications is complete on the post-surgical mammography and, in the case of biopsy excision, that healthy margins of at least 10 millimetres exist. Following surgery, there is no sufficient consensus to propose essential recommendations concerning the place of monitoring alone, irradiation or tamoxifen.


Subject(s)
Breast Neoplasms , Carcinoma in Situ , Carcinoma, Ductal, Breast , Biopsy, Needle , Breast/pathology , Breast Neoplasms/diagnosis , Breast Neoplasms/diagnostic imaging , Breast Neoplasms/pathology , Breast Neoplasms/radiotherapy , Breast Neoplasms/surgery , Carcinoma in Situ/diagnosis , Carcinoma in Situ/diagnostic imaging , Carcinoma in Situ/pathology , Carcinoma in Situ/radiotherapy , Carcinoma in Situ/surgery , Carcinoma, Ductal, Breast/diagnosis , Carcinoma, Ductal, Breast/diagnostic imaging , Carcinoma, Ductal, Breast/pathology , Carcinoma, Ductal, Breast/radiotherapy , Carcinoma, Ductal, Breast/surgery , Combined Modality Therapy , Diagnosis, Differential , Female , Follow-Up Studies , Humans , Mammography , Mastectomy , Middle Aged , Radiotherapy Dosage , Tamoxifen/therapeutic use , Time Factors
14.
Biomed Tech (Berl) ; 47(5): 117-23, 2002 May.
Article in English | MEDLINE | ID: mdl-12090139

ABSTRACT

We extracted and quantified high frequency intra-QRS signals in idiopathic dilated cardiomyopathy (IDC). In IDC the analysis of late potentials in the terminal QRS complex often fails in predicting clinical events because of intraventricular conduction abnormalities and the absence of a circumscribed arrhythmogenic substrate. Therefore, new approaches are required to assess the electrical state of the myocardium. We investigated 21 patients suffering from IDC with (n = 14) and without (n = 7) bundle branch block. High resolution 31 lead magnetocardiograms were filtered with a 67 point 4th order Savitzky-Golay filter. The difference of the measured and filtered signals was calculated (67-200 Hz). The spatio-temporal properties and the areas under the curves of the resulting high frequency intra-QRS signals (IQCs) were studied. We detected IQCs in all patients. The patients had individual patterns regarding the temporal and spatial properties of the IQCs during depolarisation. The IQCs predominantly appeared in the initial portion of the QRS. The ratios of the areas under the curves of the IQCs and the measured signals were linearly correlated to the left ventricular enddiastolic diameter (r = 0.71, significance 0.0012). In IDC the ventricular depolarization is accompanied by individual spatial and temporal patterns of high frequency intra-QRS signals. They can be studied non-invasively from body surface mapping data with the algorithm used in this study. This provides access to the assessment of the electrical status in patients with IDC.


Subject(s)
Bundle-Branch Block/physiopathology , Cardiomyopathy, Dilated/physiopathology , Electrocardiography , Adult , Aged , Bundle-Branch Block/diagnosis , Cardiomyopathy, Dilated/diagnosis , Electrocardiography/instrumentation , Equipment Design , Female , Heart Ventricles/physiopathology , Humans , Male , Middle Aged , Pilot Projects , Predictive Value of Tests , Signal Processing, Computer-Assisted/instrumentation
15.
Brain Topogr ; 14(1): 69-80, 2001.
Article in English | MEDLINE | ID: mdl-11599534

ABSTRACT

Magnetoencephalography (MEG) using auditory evoked cortical fields (AEF) is an absolutely non-invasive method of passive measurement which utilizes magnetic fields caused by specific cortical activity. By applying the exceptionally sensitive SQUID technology to record these fields of dipolar configuration produced by the fetal brain, MEG as an investigational tool could provide new insights into the development of the human brain in utero. The major constraint to this application is a very low signal-to-noise ratio (SNR) that has to be attributed to a variety of factors including the magnetic signals generated by the fetal and maternal hearts which inevitably obscure a straightforward signal analysis. By applying a new algorithm of specific heart artefact reduction based on the relative regularity of the heart signals, we were able to increase the chance of extracting a fetal AEF from the raw data by the means of averaging techniques and principle component analysis. Results from 27 pregnant, healthy women (third trimester of their uncomplicated pregnancy) indicate an improved detection rate and the reproducibility of the fetal MEG. We evaluate and discuss a-priori criteria for signal analyses which will enable us to systematically analyze additional limiting factors, to further enhance the efficiency of this method and to promote the assessment of its possible clinical value in the future.


Subject(s)
Algorithms , Artifacts , Cerebral Cortex/physiology , Evoked Potentials, Auditory/physiology , Fetal Monitoring/methods , Fetus/physiology , Magnetoencephalography/methods , Signal Processing, Computer-Assisted/instrumentation , Acoustic Stimulation , Auditory Pathways/physiology , Auditory Perception/physiology , Cerebral Cortex/embryology , Female , Fetal Monitoring/instrumentation , Fourier Analysis , Heart Sounds/physiology , Humans , Magnetoencephalography/instrumentation , Predictive Value of Tests , Pregnancy , Reaction Time/physiology , Reproducibility of Results , Software
16.
Int J Cardiovasc Imaging ; 17(4): 315-25, 2001 Aug.
Article in English | MEDLINE | ID: mdl-11599871

ABSTRACT

INTRODUCTION: Late potentials (LP) are markers of arrhythmogenic events after myocardial infarction (MI). The localization of LP sources would help to identify arrhythmogenic myocardium. The purpose of this study was to localize these LP sources from non-invasive body surface mapping data. METHODS AND RESULTS: Six patients were investigated with cardiac MRI and signal averaged 62-lead magnetocardiography after MI. Three of them were suffering from sustained ventricular tachycardia (VT). Sophisticated computer algorithms were used in order to compute the current density on the surface of the left ventricle. We compared these current density distributions for the entire QRS complex and the high frequency LP signals. In the three patients which had premature ventricular complexes (PVCs) we localized the exit sites of these arrhythmias. We found a close matching of the low current density areas based on the QRS complexes and the high current density areas based on the LP signals. These areas predominantly corresponded to sites of the infarctions. Exit sites of PVCs were located close to these areas. CONCLUSIONS: By means of sophisticated computer algorithms we were able to localize LP sources. This would be useful in steering catheter ablation and coronary revascularization therapies. However, the method has to be proven with the help of invasive mapping in a larger number of patients.


Subject(s)
Myocardial Infarction/complications , Myocardial Infarction/physiopathology , Adult , Aged , Arrhythmias, Cardiac/diagnosis , Arrhythmias, Cardiac/etiology , Arrhythmias, Cardiac/physiopathology , Body Surface Potential Mapping , Electrophysiologic Techniques, Cardiac , Evoked Potentials , Female , Heart Ventricles/physiopathology , Humans , Image Enhancement , Magnetic Resonance Imaging , Male , Middle Aged , Myocardial Infarction/diagnosis
17.
J Urol ; 166(5): 1766-8, 2001 Nov.
Article in English | MEDLINE | ID: mdl-11586220

ABSTRACT

PURPOSE: We investigated the ultrastructure of the tunica albuginea in individuals with congenital penile curvature to explain the pathology of this disease. MATERIALS AND METHODS: Included in our study were 15 patients 17 to 24 years old with congenital penile curvature. Study material consisted of samples of the tunica albuginea excised from the greater curvature of the corpus cavernosum during surgical correction. Control samples were obtained from the lesser curvature on the side opposite the study material during the same operation. The 2 types of tissue were analyzed using transmitter electron microscopy. RESULTS: Ultrastructural examination of the control material revealed numerous collagen fibers that were homogenous in size and organization on cross section. Periodic striation was typical in collagen that produced fibers. In the study group the tunica albuginea structure had a chaotic pattern of collagen fibers that formed bundles with disrupted 3-dimensional organization. Diameter of the fibers differed greatly on cross section. We observed periodic widening and fragmentation of collagen fibers with the complete disappearance of striation and transformation into electron dense, fibrous granulated material. Disrupted fibroblasts without cell membrane and cellular organelles between collagen fibers were also visible. There was elastin accumulation without any morphological differences in the control and study groups. CONCLUSIONS: Our results show that ultrastructural changes in the tunica albuginea may cause congenital penile curvature, possibly by altering mechanical properties.


Subject(s)
Penile Erection , Penis/ultrastructure , Adolescent , Adult , Collagen/ultrastructure , Humans , Immunohistochemistry , Male
18.
Life Sci ; 69(5): 581-9, 2001 Jun 22.
Article in English | MEDLINE | ID: mdl-11510952

ABSTRACT

The effects of intracerebroventricular (icv) administration of endomorphin-2 (E2) on arterial blood pressure and pain threshold in spontaneously hypertensive rats (SHR) and modification of these effects by K [OP2] and mu [OP3] opioid receptors antagonists were investigated. Endomorphin-2 administrated icv in doses of 8, 16 and 32 mcg produced dose-dependent analgesic and hypotensive effect. In SHR decrease in blood pressure amounted 2.667, 4.0 and 6.534 kPa, respectively. Pain threshold increased by 1.7, 3.6 and 8.9 (g x 10). In Wistar Kyoto (WKY) strain, being the normotensive controls, E2 in doses of 8 and 16 mcg decrease in blood pressure was less pronounced and amounted 1.200 and 1.467 kPa, respectively, whereas the pain threshold increased by 7.2 and 10.4 (g x 10), respectively. Both E2 effects were antagonized by equimolar icv doses of beta-funaltrexamine (beta-FNA). Equimolar doses of nor-binaltorphimine (nor-BNI) attenuated analgesic action of E2, but were without hypotensive action produced by E2. A strong correlation between drop in blood pressure and increase in pain threshold observed in the SHR and WKY strains after icv administration of E2, indicate close interaction between systems responsible for pain perception and blood pressure control.


Subject(s)
Analgesics, Opioid/therapeutic use , Naltrexone/pharmacology , Narcotic Antagonists/pharmacology , Oligopeptides/therapeutic use , Pain/drug therapy , Analgesics, Opioid/pharmacology , Analysis of Variance , Animals , Blood Pressure/drug effects , Disease Models, Animal , Drug Interactions , Male , Naltrexone/analogs & derivatives , Oligopeptides/pharmacology , Pain/physiopathology , Pain Threshold/drug effects , Rats , Rats, Inbred SHR , Rats, Inbred WKY
19.
Brain Res Cogn Brain Res ; 12(1): 109-16, 2001 Aug.
Article in English | MEDLINE | ID: mdl-11489614

ABSTRACT

Mismatch negativity (MMN) is a component of the auditory evoked event-related potentials (ERP) that assesses automatic sound change detection and is disturbed in schizophrenic patients. Animal experimental evidence has linked the generation of MMN to the N-methyl-D-aspartate (NMDA) receptor. We investigated the neuromagnetic mismatch field (MMF) in healthy volunteers before and after intravenous application of a subanesthetic dose of the NMDA receptor antagonist ketamine (0.3 mg/kg). Ketamine had a significant influence on latency and dipole moment of the MMF, whereas the N100m latency of the standard tone was not prolonged and its dipole moment remained stable. Our results suggest that ketamine interferes with aspects of preattentive information processing and is in line with the view that disturbed NMDA receptor function may mediate the deficient auditory mismatch response in patients with schizophrenia.


Subject(s)
Evoked Potentials, Auditory/drug effects , Excitatory Amino Acid Antagonists/pharmacology , Ketamine/pharmacology , Acoustic Stimulation , Adult , Excitatory Amino Acid Antagonists/blood , Female , Hallucinogens/pharmacology , Humans , Ketamine/blood , Magnetoencephalography , Male , Psychomotor Performance/drug effects , Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors
20.
Prenat Diagn ; 21(3): 176-82, 2001 Mar.
Article in English | MEDLINE | ID: mdl-11260603

ABSTRACT

OBJECTIVES: Fetal magnetocardiography (FMCG), a new non-invasive diagnostic tool in the analysis of the electrophysiological changes of the heart, was selectively applied in cases of fetal arrhythmias and congenital heart defect (CHD) to demonstrate its value for diagnosis and prenatal management. METHODS: The FMCG was analysed and compared to the postnatal ECG in four cases of fetal arrhythmia [supraventricular tachycardia (two cases), complex tachy-/bradycardia (one case), ventricular extrasystoles (one case)] and a case of right heart hypoplasia diagnosed by established methods prior to investigation. RESULTS: A Wolf-Parkinson-White (WPW) syndrome was diagnosed by its characteristic features and the appropriate transplacental therapy chosen. The types of arrhythmia could be characterised in accordance with postnatal ECG findings and irregular conduction was demonstrated in association with a CHD. CONCLUSIONS: The use of the FMCG provides additional information to the common diagnostic tools that influence therapeutic decisions and thus contributes to optimal pre- and postnatal management.


Subject(s)
Arrhythmias, Cardiac/diagnosis , Electrocardiography/methods , Fetal Diseases/diagnosis , Heart Defects, Congenital/diagnosis , Prenatal Diagnosis , Adult , Female , Humans , Magnetics , Pregnancy , Prenatal Diagnosis/methods , Wolff-Parkinson-White Syndrome/diagnosis
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