Attitudes of doctors of medicine and dental medicine towards contacting patients via social networks

Background

As the use of social networking sites (SNSs) has greatly increased among health professionals, it is necessary to investigate their use of SNSs. The aim of this study was to identify the patterns of SNS use for contact with patients between medical doctors (MD) and doctors of dental medicine (DMD) in Croatia.

Methods

In collaboration with the Croatian Medical Chamber and the Croatian Chamber of Dental Medicine, a quantitative cross-sectional study was conducted on the use of SNSs and the attitudes of MDs and DMDs towards e-professionalism. Data were collected using online questionnaires. The data were analyzed using descriptive statistics.

Results

A total of 753 responses were processed, 507 (67,3%) MDs and 246 (32,7%) DMDs. DMDs were significantly more likely to visit patients or their family members’ profiles on SNSs (60,6% vs 33,3%, P < 0.001). The main reason for visiting a patient’s or family member’s profile is social communication, which is significantly more common among DMDs (46,3% vs 29,0%, P < 0.002). DMDs are significantly more likely to send friend requests from private SNS profiles to patients or their family members (15,0% DMDs vs 3,4% MDs, P < 0.001). Patients are much more likely to send friendship and connection requests on SNS to DMDs (91,1% DMDs vs 62,7% MDs, P < 0.001) who are also significantly more likely to accept these requests (76,8% DMDs vs 41,5% MDs, P < 0.001). MDs and DMDs would find the presence of e-professionalism guidelines useful (72,2% MDS vs 78,0% DMDs, P = 0.103).

Conclusions

The results show that DMDs are more open to communicating with patients via SNSs. Results showed a difference between MDs and DMDs in both directions - in sending requests to patients or their family members and in positive responses to their requests for connection. The findings point to the need to develop guidelines for health professionals regarding e-professionalism.

Key messages

• There are differences between MDs and DMDs toward communicating with patients using SNSs, DMDs being more open to the communication with patients.

• There is a need to develop guidelines for health professionals on e-professionalism with emphasis regarding how to professionally communicate with patients on SNSs.

Characterization of passive dosimeters in proton pencil beam scanning - A EURADOS intercomparison for mailed dosimetry audits in proton therapy centres

The lack of mailed dosimetry audits of proton therapy centres in Europe has encouraged researchers of EURADOS Working Group 9 (WG9) to compare response of several existing passive detector systems in therapeutic pencil beam scanning. Alanine Electron Paramagnetic Resonance dosimetry systems from 3 different institutes (ISS, Italy; UH, Belgium and IFJ PAN, Poland), ^natLiF:Mg, Ti (MTS-N) and ^natLiF:Mg, Cu, P (MCP-N) thermoluminescent dosimeters (TLDs), GD-352M radiophotoluminescent glass dosimeters (RPLGDs) and Al₂O₃:C optically stimulated dosimeters (OSLDs) were evaluate. Dosimeter repeatability, batch reproducibility and response in therapeutic Pencil Beam Scanning were verified for implementation as mail auditing system. Alanine detectors demonstrated the lowest linear energy transfer (LET) dependence with an agreement between measured and treatment planning system (TPS) dose below 1%. The OSLDs measured on average a 6.3% lower dose compared to TPS calculation, with no significant difference between varying modulations and ranges. Both GD-352M and MCP-N measured a lower dose than the TPS and luminescent response was dependent on the LET of the therapeutic proton beam. Thermoluminescent response of MTS-N was also found to be dependent on the LET and a higher dose than TPS was measured with the most pronounced increase of 11%. As alanine detectors are characterized by the lowest energy dependence for different parameters of therapeutic pencil beam scanning they are suitable candidates for mail auditing in proton therapy. The response of luminescence detector systems have shown promises even though more careful calibration and corrections are needed for its implementation as part of a mailed dosimetry audit system.

Out-of-field doses for scanning proton radiotherapy of shallowly located paediatric tumours-a comparison of range shifter and 3D printed compensator

The lowest possible energy of proton scanning beam in cyclotron proton therapy facilities is typically between 60 and 100 MeV. Treatment of superficial lesions requires a pre-absorber to deliver doses to shallower volumes. In most of the cases a range shifter (RS) is used, but as an alternative solution, a patient-specific 3D printed proton beam compensator (BC) can be applied. A BC enables further reduction of the air gap and consequently reduction of beam scattering. Such pre-absorbers are additional sources of secondary radiation. The aim of this work was the comparison of RS and BC with respect to out-of-field doses for a simulated treatment of superficial paediatric brain tumours. EURADOS WG9 performed comparative measurements of scattered radiation in the Proteus C-235 IBA facility (Cyclotron Centre Bronowice at the Institute of Nuclear Physics, CCB IFJ PAN, Kraków, Poland) using two anthropomorphic phantoms-5 and 10 yr old-for a superficial target in the brain. Both active detectors located inside the therapy room, and passive detectors placed inside the phantoms were used. Measurements were supplemented by Monte Carlo simulation of the radiation transport. For the applied 3D printed pre-absorbers, out-of-field doses from both secondary photons and neutrons were lower than for RS. Measurements with active environmental dosimeters at five positions inside the therapy room indicated that the RS/BC ratio of the out-of-field dose was also higher than one, with a maximum of 1.7. Photon dose inside phantoms leads to higher out-of-field doses for RS than BC to almost all organs with the highest RS/BC ratio 12.5 and 13.2 for breasts for 5 and 10 yr old phantoms, respectively. For organs closest to the isocentre such as the thyroid, neutron doses were lower for BC than RS due to neutrons moderation in the target volume, but for more distant organs like bladder-conversely-lower doses for RS than BC were observed. The use of 3D printed BC as the pre-absorber placed in the near vicinity of patient in the treatment of superficial tumours does not result in the increase of secondary radiation compared to the treatment with RS, placed far from the patient.

Community based medical education – specific needs of elderly population

Background

Many countries in the world are facing problem of population ageing. As a part of medical education regarding that matter, The Community Health Course, based on line that main fields of work for physicians are communities, not physician's consulting rooms, has been conducted at School of Medicine University of Zagreb.

Objectives

Students of last (sixth) year of study attend The Course through one week in rural and semi-urban areas of Croatia. They have insight in living conditions and needs of elderly population trough participation in work with community nurses, family doctors/general practitioners and gerontology house helpers. Students evaluate activities by anonymous questionnaire, giving a grade (from one-very bad to five-outstanding) and writing a short description of experience. For the purpose of this paper we analysed student's evaluation from academic year 2018./19.

Results

Very good and outstanding found 94% of students (N = 299) work with community nurse, 92% with gerontology helpers and 87% with physicians. The value of activities they described as: “ we got an insight into functioning and organization of healthcare outside clinical hospital centres and Zagreb, we entered homes of people and saw how and in what conditions they live”, “being able to participate in work with gerontology helpers and community nurses, first-hand learning, we learned a lot about community”, “extremely valuable insight into lives of people in very difficult life situations and evidenced value of gerontology home helpers”, “I saw differences of living conditions and health care between countryside and city”.

Conclusions

The results of evaluation showed students recognition of importance community oriented medical education, emphasising awareness about specific needs of elderly population.

Key messages

Community oriented medical education could motivate students to choose work in countryside areas in future carriers. Students recognized importance of community oriented medical education, emphasising awareness about specific needs of elderly population.

Project on monitoring persistence of body mass index of school aged children

Issue

Childhood obesity is one of the most important public health issues today. In Croatia every third school aged child are overweight. Monitoring of nutritional status of school aged children in Croatia is a part of routine health examinations provided by School health service, while Project on tracking BMI from early school aged to adolescence provided insight into the risk of overweight in adolescence. Risk assessment for overweight is important in planning interventions in Croatia, as well in other countries.

Description of the Problem

Objective of the project was to collect and analyze anthropometric data of representative sample of Croatian school aged children, to determine tracking of BMI from early school age to adolescence and to assess the risk for overweight in adolescence. Longitudinal follow up included period from first to eight grade of primary school. Data of date of birth, body weight and height were obtained from medical records, and BMI was evaluate according to the national reference values.

Results

Project included 641 participant (49.8% girls) with the data of three measurements within health examination in primary school. Normal weight in all free measurements were 226 (71%, CI95% 66-76%) girls, and 192 (60%, CI95% 54-65%) boys, while overweight were 18 (6%, CI95% 4-9%) girls and 26 boys (8%, CI95% 5-12%), respectively. Probabilities of being overweight in eight grade for girls and boys normal weight in first grade were 10% (CI95% 7-14%) and 13% (CI95% 10-18%), while for overweight in first grade probabilities were 63% (CI95% 46-78%) and 69% (CI95% 54-81%), respectively. Risk of being overweight in eighth grade started increasing at 75th BMI centile value in first grade.

Lessons

Project showed importance of monitoring persistence of BMI of school age children. Intervention should target normal weight children as well, in order to maintain normal weight during the lifespan.

Key messages

Monitoring of nutritional status and risk assessment for overweight is important in planning interventions. Intervention should target not only overweight children, but normal weight children as well.

Adolescent mental health: analysis using YP-CORE test in School health services in Croatia

Issue

Adolescent mental health problems are a leading health problem in this population and remain unrecognized for a long time. The aim of this study was to examine the mental health problems with YP-CORE test as a part of regular school health periodic examination of first-year secondary school students (ages 15-16).

Description of Problem

Study included 392 first-year Zagreb secondary school students (74.5% girls) academic year 2019/2020. Data were collected by YP-CORE test ten questions about feeling over the last week. The students provided informed consent, and testing was done during regular periodic examinations. Data were analyzed using descriptive statistics.

Results

At risk of mental health problems were 7.5% of girls (22/292) and 2.0% of boys. Nine girls (3.1%) had a low overall score, ≤ 19 points, which would mean little risk but had a positive answer to the question 'I've thought of hurting myself'. Ten girls (3.3%) had a score of ≥ 20, which meant an increased risk and a particularly positive answer was the 'I've thought of hurting myself' question. Three girls (1%) had a score of ≥ 20, which meant an increased risk with no additional risk of auto-aggression. The results in the boys are completely different. Two students, 2% (2/100) had a total score of ≥ 17, which meant an increased risk and a particularly positive answer was the 'I've thought of hurting myself' question. All recognized risk students are immediately involved in the counseling of the School and University Medicine Counseling Services provided by every secondary school in Croatia.

Lessons

The results of the study showed that mental health problems have 6.1% secondary school students with gender differences, girls 7.5%, boys 2%. School health service developed a protocol for students at increased risk. The first step is school medicine specialist interview with the student, then with the parents and the student, and second step including school staff and other professionals.

Key messages

Early identification of mental health problems, timely intervention and continuous monitoring of mental health among secondary school students in Croatia. Counseling service for students should be available within the school health service, implementing preventative measures and working closely with other services and professionals.

Sexual behaviour and attitudes among university students in Zagreb

Background

Sexual behaviour of youth could have reproductive health outcomes with an impact on individual and general population health. The aim of this study was to determine sexual behaviour and attitudes among first year university students in city of Zagreb, Croatia.

Methods

Study included 298 first year students (61% of females) of Medical School University of Zagreb and 124 students (75% of females) of Catholic University of Zagreb in academic year 2017/2018. Data were collected by anonymous questionnaire School Health Survey, and analysed by descriptive statistics.

Results

Significantly higher proportion of Catholic University students have had sexual intercourse comparing to medical students of University of Zagreb (48% vs. 36%, P = 0.019). The age of first sexual intercourse for the most of students was from 16-18 years (73% of Catholic University students, and 79% of medical students). Contraception was always used among 54% of Catholic University students, and 67% of medical students, and never used among 11% and 4% of them respectively. Most of the students have gained information about human sexuality from the internet (26% of Catholic University students, and 30% of medical students), followed by friends (18%) and parents (11%) for Catholic University students, and television (25%) and friends (14%) for medical students. Most students expressed the attitude that sex education should be introduced in secondary schools (31% and 36%, respectively), followed by both, in primary and secondary schools (21%, and 30% respectively). Fourteen percent of Catholic University students and 7% of medical students thought that sex education should not be introduced to schools.

Conclusions

Results showed risky sexual behaviour of university students, especially Catholic University students, indicating the need of continuous education on reproductive health among youth.

Key messages

Results indicate the need of intervention and continuous education on reproductive health among university students in Zagreb, Croatia. Results showed insufficient use of contraception especially among Catholic University students indicating the need of education on reproductive health among medical and nonmedical students.

COMPARISON OF RESPONSE OF PASSIVE DOSIMETRY SYSTEMS IN SCANNING PROTON RADIOTHERAPY-A STUDY USING PAEDIATRIC ANTHROPOMORPHIC PHANTOMS

Proton beam therapy has advantages in comparison to conventional photon radiotherapy due to the physical properties of proton beams (e.g. sharp distal fall off, adjustable range and modulation). In proton therapy, there is the possibility of sparing healthy tissue close to the target volume. This is especially important when tumours are located next to critical organs and while treating cancer in paediatric patients. On the other hand, the interactions of protons with matter result in the production of secondary radiation, mostly neutrons and gamma radiation, which deposit their energy at a distance from the target. The aim of this study was to compare the response of different passive dosimetry systems in mixed radiation field induced by proton pencil beam inside anthropomorphic phantoms representing 5 and 10 years old children. Doses were measured in different organs with thermoluminescent (MTS-7, MTS-6 and MCP-N), radiophotoluminescent (GD-352 M and GD-302M), bubble and poly-allyl-diglycol carbonate (PADC) track detectors. Results show that RPL detectors are the less sensitive for neutrons than LiF TLDs and can be applied for in-phantom dosimetry of gamma component. Neutron doses determined using track detectors, bubble detectors and pairs of MTS-7/MTS-6 are consistent within the uncertainty range. This is the first study dealing with measurements on child anthropomorphic phantoms irradiated by a pencil scanning beam technique.

Dose distribution of secondary radiation in a water phantom for a proton pencil beam-EURADOS WG9 intercomparison exercise

Systematic 3D mapping of out-of-field doses induced by a therapeutic proton pencil scanning beam in a 300  ×  300  ×  600 mm³ water phantom was performed using a set of thermoluminescence detectors (TLDs): MTS-7 (⁷LiF:Mg,Ti), MTS-6 (⁶LiF:Mg,Ti), MTS-N (^natLiF:Mg,Ti) and TLD-700 (⁷LiF:Mg,Ti), radiophotoluminescent (RPL) detectors GD-352M and GD-302M, and polyallyldiglycol carbonate (PADC)-based (C₁₂H₁₈O₇) track-etched detectors. Neutron and gamma-ray doses, as well as linear energy transfer distributions, were experimentally determined at 200 points within the phantom. In parallel, the Geant4 Monte Carlo code was applied to calculate neutron and gamma radiation spectra at the position of each detector. For the cubic proton target volume of 100  ×  100  ×  100 mm³ (spread out Bragg peak with a modulation of 100 mm) the scattered photon doses along the main axis of the phantom perpendicular to the primary beam were approximately 0.5 mGy Gy^-1 at a distance of 100 mm and 0.02 mGy Gy^-1 at 300 mm from the center of the target. For the neutrons, the corresponding values of dose equivalent were found to be ~0.7 and ~0.06 mSv Gy^-1, respectively. The measured neutron doses were comparable with the out-of-field neutron doses from a similar experiment with 20 MV x-rays, whereas photon doses for the scanning proton beam were up to three orders of magnitude lower.

Measurement of maximum skin dose in interventional radiology and cardiology and challenges in the set-up of European alert thresholds

To help operators acknowledge patient dose during interventional procedures, EURADOS WG-12 focused on measuring patient skin dose using XR-RV3 gafchromic films, thermoluminescent detector (TLD) pellets or 2D TL foils and on investigating possible correlation to the on-line dose indicators such as fluoroscopy time, Kerma-area product (KAP) and cumulative air Kerma at reference point (CK). The study aims at defining non-centre-specific European alert thresholds for skin dose in three interventional procedures: chemoembolization of the liver (CE), neuroembolization (NE) and percutaneous coronary interventions (PCI). Skin dose values of >3 Gy (ICRP threshold for skin injuries) were indeed measured in these procedures confirming the need for dose indicators that correlate with maximum skin dose (MSD). However, although MSD showed fairly good correlation with KAP and CK, several limitations were identified challenging the set-up of non-centre-specific European alert thresholds. This paper presents preliminary results of this wide European measurement campaign and focuses on the main challenges in the definition of European alert thresholds.

HPA-axis regulation at in-patient admission is associated with antidepressant therapy outcome in male but not in female depressed patients

A concatenation of data implicates a hyperactivity of the hypothalamus pituitary adrenal (HPA)-axis in the pathogenesis of depression and its normalization as a necessary predecessor of clinical response to antidepressant drugs. In addition, regulation of the HPA-axis has been shown to be dependent on sex hormones. We therefore investigated gender differences in HPA-axis regulation in depression and its normalization during remission of clinical symptoms. We used the combined dexamethasone suppression/CRH stimulation (Dex-CRH) test to evaluate the degree of HPA-axis dysregulation in 194 in-patients with unipolar depression from the Munich Antidepressant Response Signature (MARS) study at both admission and discharge. The Hamilton Depression (HAM-D) Rating Scale was used to monitor clinical response to antidepressant treatment. For both genders, we observed a normalization of HPA-axis dysregulation in remitters but not in non-remitters, both after 5 weeks of treatment and at discharge. The pattern of HPA-axis normalization with remission of depressive symptoms, however, showed gender-specific differences. In male patients, remission after 5 weeks of in-patient treatment was associated with a significantly higher cortisol response in the Dex-CRH test at admission. In female patients, 5-week remitters and non-remitters had a comparable cortisol response at admission. Cortisol response at admission was not correlated with gonadal steroid levels at this time point and the results were similar for pre-menopausal women vs. post-menopausal women. Gender-associated biological characteristics, likely independent of circulating gonadal steroids, thus seem to influence HPA-axis regulation in depression. In male patients, a single measure of HPA-axis dysregulation at admission may serve as a predictor of response to antidepressant treatment in addition to the previously reported repeated measure of the Dex-CRH test.

Impaired divided attention predicts delayed response and risk to relapse in subjects with depressive disorders

BACKGROUND

This study addresses the complex relationship between cognitive function and the course of depression.

METHOD

A sample of patients (n=73) in a depressive episode (major depression or bipolar disorder) was tested with a comprehensive battery of attention and executive tasks at both admission and discharge. In addition, response to pharmacological treatment and remission was assessed with standardized rating scales. Nineteen patients, recovered from depression, were re-investigated 6 months after discharge to determine whether specific cognitive parameters were related to subsequent relapse.

RESULTS

On admission, patients were impaired in almost all cognitive tasks. At discharge, we found a significant reduction in psychopathology, but only marginal cognitive improvements. Non-responders after 4 weeks of antidepressive medication and subjects who did not achieve remission prior to discharge were specifically impaired in divided attention on admission (p < 0.05). In addition, a trend was found for the association between impaired divided attention at discharge and an elevated risk to relapse (p < 0.10).

CONCLUSIONS

We observed generalized cognitive impairment in most cognitive domains in acute depression. Cognitive impairments were still within abnormal ranges at discharge but less distinct. Divided attention performance predicted response to treatment, remission of symptoms, and risk to relapse. Impaired divided attention capacity can be explained either by reduced attentional resources or impaired activation and/or top-down control of attentional resources by the central executive.

Pharmacological and nonpharmacological factors influencing hypothalamic-pituitary-adrenocortical axis reactivity in acutely depressed psychiatric in-patients, measured by the Dex-CRH test

The most consistent biological findings in patients with depression are abnormalities in the hypothalamic-pituitary-adrenal (HPA)-axis, which can be measured using the combined dexamethasone-suppression/CRH-stimulation (Dex-CRH) test. The reactivity of the HPA-axis in this test, however, ranges over several orders of magnitude in depressed patients with comparable severity of symptoms. In this present study, we investigate which factors influence the magnitude of the response in the Dex-CRH test in 235 acutely depressed in-patients. We first examined the effects of common confounders shown to influence the HPA-axis, such as caffeine and nicotine consumption, acute stressors during the test, weight, gender, and age. Of all these variables, only female sex and nicotine consumption were positively correlated with the cortisol or ACTH response, respectively. As for the effects of psychopharmacological treatment, only the intake of carbamazepine and the fact of having relapsed under an established pharmacotherapy significantly increased the response in the Dex-CRH test, whereas the presence or absence of antidepressant treatment, the type of antidepressant treatment, or the number of ineffective antidepressant treatment trials during the index episode up to admission did not have any effect. We also found a positive correlation of the number of previous episodes, the overall HAM-D score and the severity of somatic/vegetative symptoms with the results in the Dex-CRH test. These results underline that in depressed patients this test is not majorly influenced by disease-unrelated factors. In addition, current antidepressant treatment does not appear to affect test outcome in the absence of clinical response. The influence of the number of previous episodes and relapse under pharmacotherapy suggests that HPA-axis reactivity may be altered by repetitive states of hypercortisolemia or continuous antidepressant treatment. Finally, more severe vegetative symptoms are associated with an enhanced HPA-axis activity.

Recall and recognition in Huntington's disease

We assessed 19 patients with Huntington's disease (HD) at early to moderately advanced stages of their disease using memory tests that investigated verbal and visual recall and recognition. In those tests where identical material was subject to recall and recognition the standardized results (z scores) were lower for recognition. Performance was better with pictorial than with verbal material. While recognition bias and savings scores did not differ significantly from controls, all other recognition parameters did so. This is in contrast to the claim that defective retrieval in HD is greatly enhanced by multiple choice recognition. One major reason for maintaining this assumption was apparently the disregard of false-positive responses. Our results indicate that verbal and visual recognition are impaired in HD, and the notion of a salient deficit of free recall is not supported.

Visually guided exploration in Huntington disease

We compared 24 patients in various stages of Huntington disease (HD) with 26 control patients free from cerebral disorders using a simple visual saccadic tracking test. The two groups were well matched in regard to age, sex, verbal IQ and years of schooling. Test results differed widely. On a time versus error plot, sensitivity (96%) and specificity (100%) were high and the results did not depend on age, education, or disease duration, although an influence of disease stage could be observed. This study shows that a simple saccadic tracking task may be useful in detecting visuomotor disturbances in HD.

Insulin downregulates pyruvate dehydrogenase kinase (PDK) mRNA: potential mechanism contributing to increased lipid oxidation in insulin-resistant subjects

Oxidative metabolism of glucose is regulated by pyruvate dehydrogenase (PDH) that can be inhibited by isoforms of PDH kinase (PDK). Recently, increased PDK activity has been implicated in the pathogenesis of insulin resistance and non-insulin-dependent diabetes mellitus (NIDDM) in obese subjects. Using quantitative RT-PCR, we measured mRNA of PDK2 and PDK4 isoforms in skeletal muscle biopsies from nondiabetic Pima Indians, a population with a high prevalence of NIDDM associated with obesity. PDK2 and PDK4 mRNAs were positively correlated with fasting plasma insulin concentration, 2-h plasma insulin concentration in response to oral glucose, and percentage body fat, whereas both isoforms were negatively correlated with insulin-mediated glucose uptake rates. Measurements of PDK2 and PDK4 mRNA during the hyperinsulinemic-euglycemic clamp and of PDK2 in cell culture indicated that both transcripts decrease in response to insulin. Increased fatty acid (FA) oxidation has been traditionally viewed as the cause for increased PDK activity contributing to insulin resistance in obese subjects. In contrast, our data indicate that insufficient downregulation of PDK mRNA in insulin-resistant individuals could be a cause of increased PDK expression leading to impaired glucose oxidation followed by increased FA oxidation.

A common variant in PPP1R3 associated with insulin resistance and type 2 diabetes

Selected candidate genes have been analyzed in the Pima Indians of Arizona based on evidence that insulin resistance and type 2 diabetes have significant genetic determinants. An amino acid substitution at codon 905 of the glycogen-targeting subunit of type 1 protein phosphatase that regulates skeletal muscle glycogenesis was recently reported to be associated with changes in insulin action in Danish subjects. In addition to the variant at 905, we report here a novel substitution at codon 883 and common variant of an "ATTTA" element in the 3'-untranslated region (UTR) of the corresponding gene (PPP1R3). The 3'-UTR variant resembled the mRNA-destabilizing AT(AU)-rich elements (AREs) and resulted in a 10-fold difference in reporter mRNA half-life, was correlated with PPP1R3 transcript and protein concentrations in vivo, and was associated with insulin resistance and type 2 diabetes in the Pimas. The variant is more common in Pimas (0.56) than in Caucasians (0.40). Because of its apparent effect on expression of PPP1R3, it may, in part, contribute to the higher prevalence of type 2 diabetes in this Native American population.

Human PON2 gene at 7q21.3: cloning, multiple mRNA forms, and missense polymorphisms in the coding sequence

We report the cloning and characterization of human PON2, a paraoxonase-related gene-2 that is physically linked with PON1 and PON3 on 7q2l.3. PON2 is ubiquitously expressed and we identified several mRNA forms produced by alternative splicing, or by the use of a second transcription start site. We also describe two polymorphisms in the coding sequences that, in the protein deduced from the longest open reading frame, predict an alanine-to-glycine substitution at residue 147 and a serine-to-cysteine substitution at residue 310.

Chemosensory event-related potentials in response to trigeminal and olfactory stimulation in idiopathic Parkinson's disease

Decrease of olfactory function in patients with Parkinson's disease (PD) has been reported by several authors. The current study investigated olfaction in PD patients using olfactory event-related potentials (OERPs) as an electrophysiologic correlate of olfactory function in combination with psychophysical testing. A specific focus was the influence of antiparkinsonian drugs. We investigated PD patients treated with antiparkinsonian drugs (n = 13) and PD patients who received no pharmacologic treatment (n = 18). They were compared to age- and sex-matched control subjects (n = 38). To obtain OERPs, stimulants were chosen to stimulate specifically the olfactory nerve (2.1 ppm vanillin, 0.8 ppm H2S). In addition, chemosomatosensory event-related potentials were recorded after trigeminal stimulation with 52% v/v CO2. Moreover, the subjects' ability to identify and to discriminate odorants was tested by means of a "squeeze bottle" technique. The study yielded the following major results: (1) Odor identification was impaired in PD patients. It was not influenced by treatment with antiparkinsonian drugs. (2) The OERP latencies were prolonged in both PD patients taking and not taking antiparkinsonian drugs; however, this effect was more pronounced in PD patients taking antiparkinsonian drugs. (3) The intranasal chemosensory trigeminal system seemingly was neither affected by the neuronal degeneration seen in PD nor by treatment with antiparkinsonian drugs.

Cloning and characterization of PDK4 on 7q21.3 encoding a fourth pyruvate dehydrogenase kinase isoenzyme in human

Different isoenzymes of pyruvate dehydrogenase kinase (PDK) inhibit the mitochondrial pyruvate dehydrogenase complex by phosphorylation of the E1alpha subunit, thus contributing to the regulation of glucose metabolism. By positional cloning in the 7q21.3-q22.1 region linked with insulin resistance and non-insulin-dependent diabetes mellitus in the Pima Indians, we identified a gene encoding an additional human PDK isoform, as evidenced by its amino acid sequence identity (>65%) with other mammalian PDKs, and confirmed by biochemical analyses of the recombinant protein. We performed detailed comparative analyses of the gene, termed PDK4, in insulin-resistant and insulin-sensitive Pima Indians, and detected five DNA variants with comparable frequencies in both subject groups. Using quantitative reverse transcription polymerase chain reaction, we found that the variants identified in the promoter and 5'-untranslated region did not correlate with differences in mRNA level in skeletal muscle and adipose tissue. We conclude that alterations in PDK4 are unlikely to be the molecular basis underlying the observed linkage at 7q21.3-q22.1 in the Pima Indians. Information about the genomic organization and promoter sequences of PDK4 will be useful in studies of other members of this family of mitochondrial protein kinases that are important for the regulation of glucose metabolism.

Association of the glycogen synthase locus on 19q13 with NIDDM in Pima Indians

Skeletal muscle glycogen synthase (encoded by GYS1 on chromosome 19q13.3) is the rate-limiting enzyme in insulin-mediated non-oxidative glucose disposal. Our previous studies have demonstrated an impairment of insulin-stimulated GYS1 activities in insulin-resistant Pima Indians, and associations of non-insulin-dependent diabetes mellitus (NIDDM) with the GYS1 locus were reported recently in Finnish and Japanese populations. We have performed linkage and association analyses of GYS1 and seven additional DNA markers on 19q with NIDDM, and with parameters of insulin action in the Pima Indians. We have found a significant association of NIDDM with GYS1 genotypes (p = 0.009), and with common GYS1 alleles (p = 0.022) in the Pima Indians. We have performed a detailed comparative analysis of the GYS1 gene, mRNA, and protein product in insulin-sensitive and insulin-resistant Pima Indians. No mutations in GYS1 coding sequences were detected; nor did we find alterations of GYS1 mRNA expression or of its basal enzymatic activity in insulin-resistant Pima Indians. These results contrasted with a 25% reduction of immunoreactive protein in insulin-resistant subjects as detected by Western blotting with an antibody specific for the C-terminal end of GYS1 (t-test p = 0.024; Wilcoxon's rank-sum test, p = 0.04). Because no mutations were detected in the DNA encoding this epitope, the difference in immunoreactivity may reflect post-translational modification(s) of the protein rather than a difference in the gene itself, or it could have occurred by chance. We conclude that our data do not indicate alterations in the GYS1 gene as the cause for the observed association, and that a different locus near GYS1 may be the contributing genetic element.

PCR detection of a biallelic polymorphism at D4S43

Images

[Potentials of high-resolution native computed tomography in meniscal diagnosis]

42 patients with symptoms suggestive of meniscus abnormalities were examined by CT immediately before undergoing arthroscopy. The appearances of normal menisci, various types of rupture, primary degeneration and congenital and acquired abnormalities are described. Using arthroscopy for reference, CT had an accuracy of 83%. The place of CT in relation to other non-invasive forms of tomography is discussed.

[Evaluation of the prevention of perioperative thromboembolism with low molecular weight heparin and dihydroergotamine. A study of the incidence of lethal pulmonary embolisms and undesired symptoms, especially the risk of vasospasm and myocardial infarction]

In a prospective trial 33,421 patients receiving a combination of low molecular weight heparin and dihydroergotamine (LMWH/DHE; Embolex NM) as a routine antithrombotic agent were observed. The patients were recruited from surgical, traumatological, orthopedic, gynecological and urological departments. During the observation period 17 patients suffered from myocardial infarction leading to death in 7 cases. In 63 patients pulmonary embolism occurred, causing death in 12 cases. No irreversible vasospastic reaction due to DHE was seen. In one case a reversible ischaemic reaction in a lower limb was described which might have possibly been due to DHE. The low rate of complications suggests that LMWH/DHE is a safe and highly effective combination with a low risk of vasospastic reactions.