Potential emigration of Siberian cattle germplasm on Chirikof Island, Alaska.

Feral cattle residing in Chirikof Island, Alaska, are relatively distinct from breeds used in commercial production in North America. However, preliminary evidence suggested that they exhibit substantial genetic relationship with cattle from Yakutian region of Siberia. Thus, our objective was to further elucidate quantify the origins, admixture and divergence of the Chirikof Island cattle relative to cattle from Siberia and USA. Subject animals were genotyped at 15 microsatellite loci. Compared with Turano-Mongolian and North American cattle, Chirikof Island cattle had similar variation, with slightly less observed heterozygosity, fewer alleles per locus and a positive fixation index. Analysis of the genetic distances revealed two primary clusters; one that contained the North American breeds and the Kazakh White head, and a second that contained the Yakutian and Kalmyk breeds, and the Chirikof population. Thus, it is suggested that Chirikof Island cattle may be a composite of British breeds emanating from North America and Turano-Mongolian cattle. A potential founder effect, consistent with historical records of the Russian-American period, may contribute to the adaptation of the Chirikof Island cattle to their harsh high-latitude environment. Further study of adaptive mechanisms manifest by these cattle is warranted.

Genetic diversity and genomic signatures of selection among cattle breeds from Siberia, eastern and northern Europe.

Domestication in the near eastern region had a major impact on the gene pool of humpless taurine cattle (Bos taurus). As a result of subsequent natural and artificial selection, hundreds of different breeds have evolved, displaying a broad range of phenotypic traits. Here, 10 Eurasian B. taurus breeds from different biogeographic and production conditions, which exhibit different demographic histories and have been under artificial selection at various intensities, were investigated using the Illumina BovineSNP50 panel to understand their genetic diversity and population structure. In addition, we scanned genomes from eight breeds for signatures of diversifying selection. Our population structure analysis indicated six distinct breed groups, the most divergent being the Yakutian cattle from Siberia. Selection signals were shared (experimental P-value < 0.01) with more than four breeds on chromosomes 6, 7, 13, 16 and 22. The strongest selection signals in the Yakutian cattle were found on chromosomes 7 and 21, where a miRNA gene and genes related to immune system processes are respectively located. In general, genomic regions indicating selection overlapped with known QTL associated with milk production (e.g. on chromosome 19), reproduction (e.g. on chromosome 24) and meat quality (e.g. on chromosome 7). The selection map created in this study shows that native cattle breeds and their genetic resources represent unique material for future breeding.

[INVESTIGATION ON ANTIFUNGAL SUSCEPTIBILITY OF CANDIDA YEASTS IN PREGNANT PATIENTS WITH CONFIRMED VULVOVAGINAL CANDIDIASIS AND THEIR NEWBORNS.]

Background Vulvovaginal candidiasis (VVU) is considered as a special risk factor during pregnancy, with important influence on the reproductive function of the patients and on the morbidity in the newborns from mothers with VVC. Maternal VVC is a major risk factor for the development of candida-colonization of the infant, which in turn is the first step towards the development of mucocutaneous or systemic candidiasis and Candida-septicemia in the newborn. In pregnant patients, the possible applicable local and systemic medications are limited, while the therapeutic resistance in chronic recurrent forms of VVC increases, facts that require precision of the diagnosic approach to optimize the therapeutic recommendations in pregnant patients, considered as a high risk group. The aim of this study was to investigate in vitro antifungal susceptibility of Candida yeasts to current antifungal agents in pregnant patients with confirmed VVC before the act of birth. Material and Methods Vaginal secretions of 23 healthy pregnant women with proven Candida vaginitis were taken within 48 hours before birth and the presence of yeasls of Candida was confirmed by culture examination. Between 47-72 hours after birth, samples were taken for Candida colonization of the oralmucosa and feces of their newborns. Samples were plated on Sabouraud agar and cultured in an incubator for 2 to 3 days at a temperature of 25° C. Species identification of the isolated yeasts were performed by commercial API Candida test - API 20C AUX (BioMerieux, Marcy-l'Etoile, France). Part of the isolates was identified by commercial whale AUXACOLOR (BioRad, Mames la Coquette, France). Antifungal sensitivity of isolated strains was examined by applying commercial solicitation ready kit and methods of disc diffusion and E-test, as the aim of the authors was to assess their potential for use in the diagnosis, and the correlation between them. Results Candida albicans was the prevalent etiological agent in pregnant patients with VVC immediately before birth (n = 22, 91.67 +/- 0.06%). Positive Candida colonization was detected in 14 (58.33%) of their newborns (n = 24), as no statistically significant difference was established, depending on the mode of delivery. The investigated antifungal susceptibility with test Fungifast (ELITech Microbiology Reagents), found 100% sensitivity of Candida albicans to Amphotericin B, Flucytosin and Voriconazole. Intermediate susceptibility to Itraconazole was found in 6 of 23 (26%) maternal isolates, and 5 of 23 (22%) isolates were moderately sensitive to Fluconazole. Candida krusei showed complete resistance to Fluconazole and Itraconazole. Within the group of antifungals for topical application (Econazole, Ketoconazole, Miconazole, Nystatin), the results established that 100% of the studied fungi were sensitive to Nystatin, while within the groups of azoles for vaginal and topical use - C.krusei was 100% resistant, as the sensitivity of C. albicans varied between 60-80%. Conclusion Our recommendation, based on the esablished results is that in pregnant with uncomplicated VVC as a first-line therapy should be considered the group of vaginal azoles and Nystatin, while the systemic therapy should be considered carefully and only after the firSt trimester. In cases of oral and intestinal candidiasis in neonatology, we recommend a therapy with minimal absorbable antifungals as Nystatin and miconazole (amphotericin B is available in our country), while systemic antifungal should be initiated only as a second choice. The exact etiological diagnosis is especially important because in our country there is a tendency for increased incidence of non-albicans fungus resistant to therapy, and that changes the therapeutic behavior.

[Carriage of A Allele of Polymorphic Marker G(-238)A of TNF Gene Is Associated With Unfavorable Prognosis in Patients With Chronic Systolic Heart Failure].

AIM: to elucidate association between polymorphic markers of interleukin-6 (Il-6) and tumor necrosis factor (TNF) genes and unfavorable outcomes in patients with chronic heart failure (CHF). MATERIAL AND METHODS: We determined levels of TNF and Il-6 and genotypes of polymorphic markers G(-238)A of TNF gene (rs361525) and G(--174)C of IL-6 gene (rs1800795) in 151 patients (mean age 64.5 years) hospitalized because of decompensation of systolic CHF (left ventricular ejection fraction ≤ 40%) after stabilization of their state. Unfavorable outcomes were registered during follow-up for 2 years. RESULTS: Mean levels of NT-proBNP, Il-6, and TNF were 2481.1 ± 199.86 fmol/ml, 21.8 7.46 rg/ml, and 10.07 ± 0.65 rg/ml, respectively. 138 (94.4%), 13 (8.6%) and 0 patients were carriers of genotypes GG, AG, and AA of polymorphic marker G(-238)A of TNF gene, respectively; 54 (35.8%), 69 (45.7%), and 28 (18.5%) patients carried genotypes GG, GC, and CC of polymorphic marker G(-174)C gene IL-6, respectively. There was no association between Il-6, TNF levels and carriage of either of genotypes as well as unfavorable clinical course of CHF. Mean survival time before repetitive episode of CHF decompensation (including lethal one) was significantly shorter among carriers of A allele compared with carriers of G allele of polymorphic marker G(-238)A of TNF gene (243 ± 97.7 and 947 ± 78 days, respectively, p = 0.018). Mean time before all cause death was also shorter in carriers of A compared with carriers of G allele (289 ± 122.9 and 1039 ± 73.3 days, respectively, p = 0.03). The studied polymorphism of IL-6 gene had no prognostic value. CONCLUSION: We obtained data on association between carriage of A allele of polymorphic marker G(-238)A of TNF gene and unfavorable prognosis in patients with CHF and inpraired left ventricular systolic function.

[Carriage of A Allele of Polymorphic Marker G(-238)A of TNF-alfa Gene Is Associated With Unfavorable Prognosis in Patients With Chronic Systolic Heart Failure].

AIM: to elucidate association between polymorphic markers of interleukin- 6 (Il-6) and tumor necrosis factor (TNF) genes and unfavorable outcomes in patients with chronic heart failure (CHF). MATERIAL AND METHODS: We determined levels of TNF and Il-6 and genotypes of polymorphic markers G(-238)A of TNF gene (rs361525) and G(-174)C of IL-6 gene (rs1800795) in 151 patients (mean age 64.5 years) hospitalized because of decompensation of systolic CHF (left ventricular ejection fraction less or equal 40%) after stabilization of their state. Unfavorable outcomes were registered during follow-up for 2 years. RESULTS: Mean levels of NT-proBNP, Il-6, and TNF were 2481.1+/-199.86 fmol/ml, 21.8+/-7.46 rg/ml, and 10.07+/-0.65 rg/ml, respectively. 138 (94.4%), 13 (8.6%) and 0 patients were carriers of genotypes GG, AG, and AA of polymorphic marker G(-238)A of TNF gene, respectively; 54 (35.8%), 69 (45.7%), and 28 (18.5%) patients carried genotypes GG, GC, and of polymorphic marker G(-174)C gene IL-6, respectively. There was no association between Il-6, TNF levels and carriage of either of genotypes as well as unfavorable clinical course of CHF. Mean survival time before repetitive episode of CHF decompensation (including lethal one) was significantly shorter among carriers of A allele compared with carriers of G allele of polymorphic marker G(-238)A of TNF gene (243+/-97.7 and 947+/-78 days, respectively, =0.018). Mean time before all cause death was also shorter in carriers of A compared with carriers of G allele (289+/-122.9 and 1039+/-73.3 days, respectively, p=0.03). The studied polymorphism of IL-6 gene had no prognostic value. CONCLUSION: We obtained data on association between carriage of A allele of polymorphic marker G(-238)A of TNF gene and unfavorable prognosis in patients with CHF and inpraired left ventricular systolic function.

[Ovarian epithelial malignant tumors in adolescence]. / Ovariální epiteliální malignity v adolescentním veku.

OBJECTIVE: Ovarian epithelial malignant tumors in adolescence. DESIGN: Literature review with case reports. SETTING: Department of Gynaecology and Obstetrics, Faculty of Medicine at Masaryk´s University and Fakulty Hospital Brno. METHODS: Literature review on ovarian epithelial malignant tumors in adolescence, their epidemiology, diagnosis and therapy with illustrative case reports. CONCLUSION: The ovarian epithelial malignant tumors in the adolescence represent rare group of these diseases according to the data from the National Cancer Registry. However, it is a very sensitive area of oncogynecology, that requires highly personalized approach and the cooperation with patient´s family. The ovarian epithelial malignant tumors in the age group of 15-19 years show some differences from these diseases of adults and older women. The differences concern the extent of the disease at the time of the diagnosis, the histopathological characteristics of the tumors and the proportion surgical therapy and chemotherapy. The diagnostic algorithm requires the cooperation with the colleagues from pediatric gynecology and oncology. Due to the occurrence of localizated stages and good tumor differentiation prevails the monotherapy presented the surgical treatment, especially in the form of the radical fertility-preserving procedures. The care of the patients should be concentrated into the oncogynecological centres.

Platinum(IV) complexes with some derivatives of 5-methyl-5-(4-pyridyl) hydantoin. Synthesis, study and comparative pharmacological investigation.

3 Pt(IV) complexes with 3-ethyl-5-methyl-5-(4-pyridyl)hydantoin (4), 3-propyl-5-methyl-5-(4-pyridyl)hydantoin (5) and 3-benzyl-5-methyl-5-(4-pyridyl)hydantoin (6) with general formulae cis-[Pt(L)2Cl4] were synthesized. The novel compounds were characterized by elemental analysis, IR, 1H, 13C, NMR spectra in solid state and in solution. The studies showed that the ligands coordinate to the platinum ions in a monodentate manner through the nitrogen atom from the pyridine ring. The cytotoxic activity in vitro of newly synthesized complexes as well as their previously prepared analogous of Pt(IV) with other derivatives like 3-amino-5-methyl-5-(4-pyridyl)hydantoin (1), 5-methyl-5-(4-pyridyl)hydantoin (2), 3,5-dimethyl-5-(4-pyridyl)hydantoin (3) was screened against a panel of human tumor cell lines. The tested compounds displayed cytotoxic activity which was invariably superior with the Pt(IV) complex with 3-benzyl-5-methyl-5-(4-pyridyl)hydantoin (6) causing 50% inhibition of cellular viability at micromolar concentration, though the activity of the other studied Pt(IV) complexes proved to greatly decrease in the order 5-4-3-2-1.

[Evaluation of the expression of S100A1 protein in serous, mucinous and endometroid ovarian carcinoma].

According to literature approximately 60% from all ovarian malignances express epithelial phenotype. According to their histomorphological characteristics, epithelial ovarian tumors are divided into eight groups. In some particular cases, separate histological types are hard to distinguish one from another. Recent studies show the presence of beneficial effect of adjuvant radiotherapy on most of the early ovarian carcinomas (all, except serous carcinomas). In renal cell carcinomas SI00A 1 is used to distinguish between different subtypes of the malignancy. Forty cases of ovarian carcinomas were analyzed in a retrospective study. Immunohistochemical evaluation of the S100A1 protein expression was carried out on representative archival formalin -fixed -paraffin-embedded tissue materials. Positivity for S100A1 was observed in 31 (77.50%) of the studied cases. Twenty-seven out of thirty-two (84.38%) cases of serous ovarian carcinoma were found to express S100A1. S100A1 expression was observed in one out of the two mucinous and three out of the six endometroid ovarian carcinomas. Immunopositivity was nuclear, cytoplasmic or nuclear and cytoplasmic in serous carcinomas, nuclear in the one positive mucinous carcinoma and sytoplasmic in the three imunopositive endometroid ovarian carcinomas. The S100A1 immunohistochemical marker is not likely to be useful in clinical practice to distinguish between different histological subtypes of ovarian cancer. The large percentage of S100A1 positivity in serous ovarian carcinomas needs a better understanding.

[Peculiarities of exposure to polychlorinated biphenyls (PCBS) in the indigenous population of the coastal and mainland Chukotka].

The indigenous people of coastal areas show a low percentage of low chlorinated and dioxin-like PCB congeners (as opposed to mainland aborigines) with a significant proportion of the "triad" in the amount of PCBs. 5 years after the first survey the ratio of the analyzed groups of PCB congeners in the blood of parturients - mothers, as well as in the fetus - child in the coastal Chukotka remained unchanged, indicating that the equal share rate of clearance-accumulation of congeners and is almost equal share content of PCB congeners in the mother and child. The average duration of half-lives of PCB congeners (#105-187) from the mother's body was 4-6 years (for the sum of PCBs - 5.7 years), which is broadly consistent with the results of foreign studies. The composition of PCB congeners in the blood of the continental population significantly differs from those in the food, while coastal residents--similar to the composition of PCBs in marine mammals. The content of PCB congeners in the domestic sources of pollution has no resemblance to the composition of PCBs in the blood of the natives.

[Specificity of exposure of the indigenous dwellers of coastal and inland Chukotka to dichlorodiphenyltrichloroethane].

In the indigenous dwellers of coastal Chukotka, blood DDT levels are 1.5-2 times higher than those of continental areas, which is due to the higher global DDT pollution of a sea food chain. The blood levels of 4,4-DDE in the reproductive-age women of coastal Chukotka are comparable to those in other Russian Arctic regions, slightly lower than in Greenland, but essentially higher than in Canada, Alaska and Scandinavian countries. Blood DDE/DDT ratio in the coastal indigenous dwellers is almost twice higher than that in the inland inhabitants, which is indicative of the "older" exposure of coastal people to DDT. There was an about equal (70-75%) decrease in 4,4-DDE and 4,4-DDT levels with a practically invariable ratio (12-15) and a nearly equal elimination half-life period (about 3.5 years) in the mothers of coastal Chukotka 5 years after the first examination. The elevated 4,4-DDE/4,4-DDT ratios in the tissues of sea mammals generally correspond to higher isomer ratios in the blood of coastal natives and relatively low 4,4-DDE/4,4-DDT ratios in the venison, fowl, and fish predetermine lower ratios in the blood of inland inhabitants. The extremely low of DDE/DDT ratio (0.4) in the washouts and scrapes from the kitchen walls of dwellings are conclusively associated with the recent application of DDT as a household insecticide.

[Effect of GnRH analogues pre-treatment on myomectomy outcomes in reproductive age women]. / Vliv aplikace GnRH analog na peroperacní a postoperacní výsledky myomektomie u zen v reprodukcním veku.

OBJECTIVE: To evaluate the role of three-monthly pre-treatment with gonadothropin releasing hormone (GnRH) analogues prior to myomectomy for women in comparison with control group of patients with no application. Analysis is focused on peroperative and postoperative results of surgery treatment for women with clinically symptomatic uterine fibroids in reproductive age with interest in getting pregnant. DESIGN: Prospective clinical study. SETTING: Gynecological and Obstetric Clinic of Medical Faculty of Masaryk University and the University Hospital Brno. MAIN MEASURES: The group of 212 patients with symptomatic uterine fibroids detected by ultrasound. 90 patients (42.5%) underwent laparoscopic myomectomy (LM) and 122 patients (57.5%) underwent open laparotomic myomectomy (OM). In the selected group we were observing the common number of exstirpated uterine fibroids, their size, anatomical localisation, depth of invasion of dominant exstirpated uterine fibroid in relation to uterine wall. METHODS: Both groups of patients were randomised into two parts. The group LM with GnRH pretreatment contained 42 patients (19,8 %) and control group with no pre-treatment 48 patients (22.7%). Laparotomic part of study was divided into two groups with preoperative application of GnRH analogues 44 patients (36,7 %) and control group OM with no application 44 patients (20.8%). The main outcome measures were peroperative blood loss, duration of surgery, the length of hospital stay, evidence of per- and postoperative complications and the final results by second look laparoscopy (SLL). RESULTS: In the observed group LM with pre-treatment of GnRh analogues there was significantly higher volume of blood loss (p = 0.0003), significantly longer duration of surgery (p = 0.0063) and significantly higher lenght of hospital stay (p = 0.0025) compared with control group. We have not found a significant difference in the incidence of peroperational converse to laparotomy, final result of neoformation of uterus wall and occurrence of postoperative adhesions by SLL in observed LM group compared with control group. In the observed OM group with pre-treatment of GnRH analogues there was no significant difference in: peroperative blood loss (p = 0.5324), duration of surgery (p = 0.3927) neither average length of hospital stay compared with control group. In the OM group, there was significantly lower incidence of recidives of uterine fibroids observed by SLL (p = 0.0025) and no significant difference of occurrence of postoperative adhesions compared with control group. We have not found significant difference in the incidence of peroperative complications, early and late postoperative complications in group of LM and OM in comparison with control groups. CONCLUSION: Application of GnRH analogues in observed group of patients before LM and OM have not lead to improvement of peroperative results in comparison with control group. Pre-treatment of GnRh analogues before OM have lead to significant drop in recidives of uterine fibroids observed by SLL (p = 0.0025) compared with control group.

[The blood levels of stable toxic substances in the native residents of costal Chukotka and their children's infection morbidity].

A considerable reduction in the blood levels of stable organic pollutants (SOP) has been noted in the mothers of native ethnicities of costal Chukotka during a 5-year period, which may be accounted for by certain purification of food chains, altered diet with emphasis on delivered products, and long-term breastfeeding. The elevated level of SOP in children from birth to age 5 years is explained by long-term breastfeeding and the early consumption of local foods. The content of heavy metals (mercury and lead) in both maternal and children's blood has unchanged for 5 years. The children's infection morbidity has been quite high; at the same time no associations of the children's blood levels of toxic substances with the incidence of infectious diseases have been found. However, two children maximally exposed to SOP and metals have been observed to be rarely susceptible to diseases.

[The parameters of the blood prooxidant and antioxidant systems in bacterial and viral pneumonias].

AIM: To determine the level of malondialdehyde (MDA) in plasma and nitro blue tetrasolium in leukocytes as parameters of the blood prooxidant system and the activity of ceruloplasmin (CP) in serum and erythrocyte catalase as the parameters of antioxidant activity in bacterial and viral pneumonias. SUBJECTS AND METHODS: The blood prooxidant and antioxidant systems were studied in 177 patients with bacterial and viral pneumonia over time. RESULTS: Heterodirectional changes were found in the parameters of the blood prooxidant and antioxidant systems in bacterial and viral pneumonias. There was a regular and significant increase in MDA levels, spontaneous HCT test, and erythrocyte catalase. At the same tine, CP activity depending on the etiology, stage, and degree of the disease was inhibited. CONCLUSION: Severe prolonged impairments in the activity of the prooxidant and antioxidant systems and changes in their parameters are indicative of the more severe course of the disease, the presence of complications and infectious-inflammatory concomitant diseases.

[Lipid peroxidation in pneumonia of bacterial and viral etiologies].

The blood prooxidant and antioxidant systems were studied in 165 patients with pneumonia of bacterial and viral etiologies over time. There was a regular and significant increase in the levels of malondialdehyde, spontaneous nitroblue tetrasolium test, and catalase in the red blood cells; in parallel to this, there was ceruloplasmin activity suppression that depended on etiology, stage, and severity. Much pronounced and long-term impairments of the activity and level of prooxidant and antioxidant indices were suggestive of a severer clinical course and the presence of complications and concomitant diseases of infectious and inflammatory nature.

Maternal and paternal genealogy of Eurasian taurine cattle (Bos taurus).

Maternally inherited mitochondrial DNA (mtDNA) has been used extensively to determine origin and diversity of taurine cattle (Bos taurus) but global surveys of paternally inherited Y-chromosome diversity are lacking. Here, we provide mtDNA information on previously uncharacterised Eurasian breeds and present the most comprehensive Y-chromosomal microsatellite data on domestic cattle to date. The mitochondrial haplogroup T3 was the most frequent, whereas T4 was detected only in the Yakutian cattle from Siberia. The mtDNA data indicates that the Ukrainian and Central Asian regions are zones where hybrids between taurine and zebu (B. indicus) cattle have existed. This zebu influence appears to have subsequently spread into southern and southeastern European breeds. The most common Y-chromosomal microsatellite haplotype, termed here as H11, showed an elevated frequency in the Eurasian sample set compared with that detected in Near Eastern and Anatolian breeds. The taurine Y-chromosomal microsatellite haplotypes were found to be structured in a network according to the Y-haplogroups Y1 and Y2. These data do not support the recent hypothesis on the origin of Y1 from the local European hybridization of cattle with male aurochsen. Compared with mtDNA, the intensive culling of breeding males and male-mediated crossbreeding of locally raised native breeds has accelerated loss of Y-chromosomal variation in domestic cattle, and affected the contribution of genetic drift to diversity. In conclusion, to maintain diversity, breeds showing rare Y-haplotypes should be prioritised in the conservation of cattle genetic resources.

Analysis of population differentiation in North Eurasian cattle (Bos taurus) using single nucleotide polymorphisms in three genes associated with production traits.

Single nucleotide polymorphisms (SNPs) in growth hormone 1 (GH1), insulin-like growth factor 1 (IGF1) and leptin (LEP), all candidates for production traits in cattle, were characterized in North Eurasian cattle breeds. Allele frequencies of IGF1 exhibited significant (P < 0.05) deviation from neutral expectation and therefore, might be associated with divergence in North Eurasian cattle because of genetic selection. Allele frequencies and lower heterozygosity of LEP may indicate a recent introduction of an alternative allele in this geographic region. Locus F(ST) estimates were highest for IGF1 (0.151, sigma = 0.042) and lowest for GH (0.062, sigma = 0.020). Our results suggest a slightly higher population differentiation across the candidate genes (FST = 0.108) than across microsatellites (FST = 0.095), possibly because of selection and stochastic effects.

Clinical evaluation of dentinal hypersensitivity treatment with 5% potassium nitrate dentifrice.

AIM: To evaluate the desensitizing effect of a Bulgarian-made dentifrice containing 5% potassium nitrate in a double-blind experiment. MATERIAL AND METHODS: The study included 40 clinically healthy individuals aged 23 to 60 years, who complained of increased sensitivity to thermal, chemical and mechanical stimuli in 462 teeth. The recruited patients were allocated into two groups: 20 patients were treated with the Sensi I dentifrice, and the other 20--the Sensi II dentifrice. The outcome of treatment was evaluated by any alteration in pain sensitiveness in response to different stimuli and changes in the threshold of electrical excitability. RESULTS: The Sensi I toothpaste (containing 5% potassium nitrate) was found to have a better desensitizing effect than the Sensi II placebo toothpaste (P < 0.01). The Sensi I dentifrice caused a rise in the threshold of electrical excitability of sensitive teeth with clinically intact enamel (P < 0.01), teeth with erosions (P < 0.05) and teeth with exposed root surfaces (P < 0.001). CONCLUSION: The Sensi toothpaste, containing 5% potassium nitrate, demonstrated a pronounced anesthetizing effect; it can be used successfully for treatment of dentinal hypersensitivity of teeth with clinically intact enamel, erosions and exposed root surfaces due to gingival recessions.