Parasites of carnivorous mammals in Białowieza Primeval Forest

BACKGROUND: Although the parasitofauna of wild carnivorous mammals in Poland is quite well recognized, there has been only one research carried on this issue so far in Bia?owieza Forest--the last lowland primeval forest of temperate zone in Europe. MATERIAL AND METHODS: Twelve wild and two domestic species of carnivorous mammals are living in Bia?owieza Forest. In our work faeces or intestines of all of them except ermine (Mustela erminea) have been examined and parasites or their eggs (or oocysts) recorded. In total 222 faecal probes from 13 species and 11 intestines of weasels have been investigated. RESULTS: All species of examined carnivorous mammals were infected with parasites. The most infected species has occurred red fox Vulpes vulpes (over 70% infected with parasites) meanwhile only about 30% of otters Lutra lutra were infected. We found at least three protozoan species, one trematode, one tapeworm and nine species of nematodes. Except trematode Alaria alata, all of them are reported for the first time from Bia?owieza Primeval Forest. Oocysts of coccidia have been found in faeces of nine host species, with the highest prevalence (29.4%) in badger. Six species of carnivorous mammals have been occurred infected with trematodes (highest prevalence 42.1% in wolves) and two with tapeworms (Diphyllobothrium latum with the prevalence 2.6% in otter and 31.6% in wolves). All examined host species were infected with nematodes (with prevalence from 14.7% in lynx to 72.7% in red fox). Results of our work should be treated as preliminary researches on the species composition of parasitic fauna invading carnivorous mammals in Bia?owieza Primeval Forest.     

Genetic background of ADHD: genes of the serotonergic system, other candidate genes, endophenotype

Recent studies have shown that in the aetiology of attention-deficit hyperactivity disorder (ADHD) genetic factors may be of importance. Biochemical and pharmacological studies reveal a connection between abnormalities of dopaminergic, adrenergic and serotonergic system and ADHD. Therefore genes for enzymes synthesizing or degrading proper neurotransmitters, genes for adequate transporters and receptors and genes for other substances, which altered the level of neurotransmitters, are studied. Many authors describe the connection between ADHD development and the synaptosomal-associated protein 25 (SNAP-25) gene. This protein plays a role in catecholamine secretion. Its higher expression is specific for neurones. SNAP-25 gene mutation may change this protein level, function of synapse and neurotransmitters storage. Acetylcholine receptor alpha4 subunit gene stimulation increases the dopamine level. Therefore this receptor gene may be important in the aetiology of ADHD studies. Other possible factors in ADHD background are substance influence on brain maturation, including N-methyl-D aspartate glutamate receptor 2A gene polymorphism (GRIN2A) and brain derived neurotrophic factor (BDNF) gene. One of the greatest challenges in studying the genetic basis of psychiatric disorders is to find appropriate ways to define the relevant endophenotype. ADHD often coexists with other psychiatric disorders, including specific developmental disorders, conduct disorders, obsessive-compulsive disorder and early onset of bipolar disorder.     

Genetic background of ADHD: population studies, genes of the catecholamine system

Attention-deficit hyperactivity disorder (ADHD) begins in early childhood. In this article we review the studies supporting a genetic background of this disorder. ADHD occurs in 3-10% of the general population. Family studies reveal a 5 times more likely frequency of ADHD among first-degree relatives than in the general population. Monozygotic twin concordance rate for ADHD is 81%, whereas for dizygotic twins it is 29%. One of the ADHD predisposing factors is dopaminergic neurotransmission abnormality. According to other studies there is a relationship between polymorphism of dopamine transporter gene (DAT), dopamine receptors genes: DRD2, DRD3, DRD4, DRD5, dopamine-beta-hydroxylase gene (DBH) and catechol-O-methyltransferase gene (COMT) and ADHD. In other articles authors describe abnormalities of the serotonergic system, such as the polymorphism of the serotonin transporter gene (5HTT/SERT), serotonin receptors genes 5HT2A and 5HT1B in the development ofADHD. Another possible factor in ADHD background is the dysregulation of the adrenergic system. The most frequently studied is the connection between polymorphism of norepinephrine transporter gene (NET), adrenergic receptors genes: alpha 2A (ADRA2A), alpha 1C (ADRA1C), alpha 2C and monoamine oxidase A gene (MAO-A).     

Increased plasma fibrinogen predicts one-year mortality in patients with acute ischemic stroke

BACKGROUND AND PURPOSE: Increased plasma fibrinogen is a risk factor for vascular diseases related to atherosclerosis. Its long-term predictive value in stroke survivors is not established. We conducted this study to establish the significance of hyperfibrinogenemia as the possible predictor of 30-day and one-year mortality in patients with acute ischemic stroke. METHODS: We studied 900 unselected patients with ischemic stroke admitted to the hospital within 24 h after onset of symptoms. We noted demographic data, risk factors for stroke, neurological deficit and disturbances of consciousness on admission. We measured plasma concentration of fibrinogen and the body temperature on day 1 and registered vital status at 1, 3, 6 and 12 months after stroke. RESULTS: Mean concentration of plasma fibrinogen was 2.9 g/L and 25.2% of patients had increased plasma concentration of fibrinogen (i.e. > or = 3.5 g/L) on day 1. Patients with hyperfibrinogenemia were more likely to die after 1, 3, 6 and 12 months than those with normal plasma fibrinogen (21.1% vs. 15.6%, 36.4% vs. 24.6%, 42.6% vs. 27.3%, 45.7% vs. 31.2%, respectively; P < 0.001 for the last three differences). Hyperfibrinogenemia did not predict short-term case-fatality, but increased concentration of plasma fibrinogen was an independent predictor of one-year case-fatality (P = 0.013; OR: 1.69 (95% CI 1.12-2.55)). Other independent predictors of one-year case-fatality were: neurological deficit on admission, age, white blood cell count, and body temperature on day 1. CONCLUSIONS: Increased concentration of plasma fibrinogen shortly after ischemic stroke independently increases risk of death within one year after stroke.     

Alternative methods of treatment used by multiple sclerosis patients in Poland

BACKGROUND AND PURPOSE: Despite the great progress that has been made in medicine, treatment of many chronic diseases, including multiple sclerosis (MS), remains hardly effective. It has been reported that more and more MS patients worldwide are using alternative methods (AM). The aim of the present study is to evaluate this phenomenon in the Polish MS population. MATERIALS AND METHODS: To obtain more data about use of AM in Poland we distributed questionnaires among 210 MS patients treated in 3 hospitals in different regions of our country: Warsaw, Gdansk and Pila. RESULTS: 210 patients (136 females and 74 males) took part in the study. 68.5% (144 of 210 questioned) declared use of AM now or in the past. The most popular (56%) was Oenothera seed oil, followed by vitamins (49%), and the third most common was massage (34%). There were no significant demographic differences between users and non-users. Neither disease duration nor disability had any impact on the decision to use AM. CONCLUSIONS: The phenomenon of use of AM by MS patients is not fully understood, but it seems that limited access to so-called immunomodulators, e.g. interferon-b or glatiramer acetate, and limited long-term efficacy are reasons why patients seek other therapies.     

The microsurgical treatment of the supratentorial arteriovenous malformations. Part I--early and late results

BACKGROUND AND PURPOSE: The aim of this study was an analysis of early and late results of the microsurgical treatment of arteriovenous malformations (AVM) located supratentorially and factors that may influence the outcome. MATERIAL AND METHODS: 88 consecutive patients operated on in the years 1983-2000 for supratentorial AVM located were included in a retrospective analysis. All patients underwent microsurgical selective removal of AVM without prior embolization. The outcome was assessed on the day of discharge according to the Glasgow Outcome Scale (GOS) and at least 6 months after surgery according to the Karnofsky Scale (KS). RESULTS: A satisfactory outcome (GR+MD in GOS) was achieved in 92%. A severe deficit appeared in 4.5% and 3 (3.4%) patients died. The only factor influencing satisfactory outcome was low grade of AVM (I-II) in the Spetzler-Martin scale (p<0.0001). Factors influencing the excellent outcome (GR in GOS) are: size of AVM<3 cm (p=0.02), non-eloquent location (p=0.001) and exclusively superficial venous drainage (p=0.04). There was no case of deterioration in the late period. In 3/4 of patients discharged with deficit, a significant improvement was observed: a mild deficit withdrew in 13 of 17, and a severe deficit withdrew in 3 of 4. A satisfactory outcome in final assessment (KS>70%) was achieved in 95.5%, severe disabling deficit (KS 50%) remained in 1.1%. CONCLUSIONS: Results of the surgical treatment of AVM are satisfactory, especially in I and II grade of the Spetzler-Martin scale. In these cases microsurgical removal should be the method of choice, because immediately after treatment the risk of further hemorrhage is eliminated. Postoperative deficits withdraw during weeks or months in most cases and the final satisfactory result was achieved in 95% of patients.