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Biomedical subjects

H P Zahradnik

Publications and source records attributed to H P Zahradnik.

At least 19 recordsLinked to original sources
PubMed2005

Belara--a reliable oral contraceptive with additional benefits for health and efficacy in dysmenorrhoea.

Although modern oral contraceptives are safe and have few side-effects, compliance towards them is sometimes less than ideal for various reasons. Compliance, however, can only be achieved when the contraceptive method is accepted by the users, that is, when it is adapted to their individual needs. Consisting of a combination of 2 mg chlormadinone acetate and 0.03 mg ethinylestradiol, Belara is a modern oral hormonal contraceptive with an unadjusted Pearl index of 0.44 (95% CI, 0.2-0.8) and an adjusted one of 0.04 (95% CI, 0.002-0.2). Its compliance rate in clinical use has been shown to be above 90%. This good acceptance is a consequence of the low rate of intermenstrual bleeding (about 8% up to the 3(rd) cycle and below 2% from the 12(th) cycle); its high cycle stability (in approximately 98% from the 6(th) cycle); the good weight stability (weight is unchanged in about 84% from the 12(th) cycle); and finally the very low rate of side-effects (below 2% after 12 cycles). In addition, a number of other benefits of using Belara also contribute to this good compliance rate. These include almost 70% improvement or complete remission of increased seborrhoea after 12 months, almost 90% improvement or cure of acne after 12 months, and improvement or remission of dysmenorrhoea after 12 months in 79% of cases. After 4 months, improvement or remission of dysmenorrhoea associated with the use of another ovulation inhibitor was seen in more than 90% of cases after switching to Belara. In conclusion, besides being an effective, modern oral hormonal contraceptive Belara offers a considerable range of additional benefits for a range of symptoms, including primary dysmenorrhea and acne.

Acne Vulgaris↗
PubMed2004

The acceptability of a small intrauterine progestogen-releasing system for continuous combined hormone therapy in early postmenopausal women.

OBJECTIVE: To assess the acceptability, ease of insertion, tolerance and associated bleeding of a novel intrauterine progestogen-releasing system, combined with transdermal estradiol, in postmenopausal women. DESIGN: An open non-comparative study of 294 postmenopausal women with an intact uterus at 27 centers in six countries. METHOD: All subjects had requested treatment for menopausal symptoms and had received transdermal estradiol 50 microg/day by patch and an experimental intrauterine system (MLS) releasing levonorgestrel 10 microg/day. Details of the insertion were recorded and subsequent bleeding, side-effects and adverse events were documented on a daily diary. Endometrial thickness was measured by transvaginal ultrasound scan prior to insertion of the MLS and after 12 months. The study is of 3 years duration. This report summarizes the results after the first year. RESULTS: The median age of the subjects was 52.6 years (range 41.7-59.6 years), 90% were within 3-5 years of menopause and 78% had previously used hormone therapy (HT). The MLS was inserted at the first attempt in 297/294 (94%) subjects and was facilitated by dilatation of the cervical canal in 65 (22%) subjects. Local anesthesia was given to 30 (10%) subjects. Of the 17 with a failed first insertion, two subjects did not want a second attempt, in 14 a second attempt succeeded, facilitated by cervical dilatation in seven and local anesthetic in three subjects. There was one failed insertion. Investigators rated 80% of first insertions as easy, 14% as slightly difficult and 6% as very difficult. The second insertion was easy in 9/15 subjects, slightly difficult in 4/15 and very difficult in one (data from one subject missing). During insertion, 34% subjects had no pain, 49% said it was mild, in 15% it was moderate and in 2% the pain was severe. At 12 months, one MLS had been expelled. Spotting was the most common form of bleeding and this decreased from a median of 9 to 0 days at 4 months, although 10% of subjects continued to report spotting up to 12 months. Bleeding days were few and mainly in the first 2 months. At the end of month 11, 66.8% were amenorrheic and 87% non-bleeding. Only nine subjects discontinued because of bleeding. There was no correlation between the bleeding profiles and number of years since menopause, previous HT use or body mass index. The median endometrial thickness at entry to the study (without HT) was 2.6 mm and 3.4 mm at 12 months. Of the adverse events, after the pain associated with insertion, headache was the next most common at 13.3% and mastalgia was experienced by 7.8% of subjects. Overall, the dropout rate was low at 28 subjects (9.5%). There were favorable changes in the serum lipid profile consistent with the effects of estradiol and suggesting minimal attenuation by the intrauterine progestogen. Conclusion This interim report of a 3-year study has confirmed that the menopausal levonorgestrel intrauterine system is easy to insert and is well tolerated by postmenopausal women.

Administration, Cutaneous↗
PubMed2004

mRNA expression profiles for corticotrophin-releasing hormone, urocortin, CRH-binding protein and CRH receptors in human term gestational tissues determined by real-time quantitative RT-PCR.

Increasing maternal plasma levels of corticotrophin-releasing hormone (CRH) during the last weeks of pregnancy suggest that this stress hormone plays an important role in the control of human parturition. Little is known about the quantitative contribution of gestational tissues (other than placenta) to intrauterine formation of CRH, urocortin and CRH-binding protein (CRH-BP), or about the distribution of CRH receptors within the uterus. We have investigated the mRNA expression of CRH, urocortin, CRH-BP and CRH receptors 1 and 2 (CRH-R1 and -R2) in gestational tissues by real-time RT-PCR. Placenta, myometrium and choriodecidua were collected after uncomplicated pregnancies at term, before the onset of labour. Distribution of CRH-R1 and CRH-R2 protein was also investigated by immunostaining with receptor subtype-specific antibodies. The placenta was identified as the main site of CRH and CRH-BP mRNA expression, displaying mRNA levels >1000 and >20 times higher than those found in the myometrium and choriodecidua respectively (P<0.05 in each case). mRNA expression of urocortin was low in all tissues investigated. Myometrium and choriodecidua expressed relevant amounts of both receptor subtypes, whereas the CRH receptor population in placenta consisted mainly of CRH-R2. The high expression of CRH in placenta and the substantial expression of CRH receptors in choriodecidua and myometrium suggested that CRH derived from placenta exerts direct or indirect actions on these tissues. Neither CRH produced by myometrium or choriodecidua nor urocortin from other intrauterine sources seem to play a major role in the control of labour.

Adult↗
PubMed2003

Expression patterns of CRH, CRH receptors, and CRH binding protein in human gestational tissue at term.

Recent research suggests a significant role for placental corticotropin-releasing hormone (CRH) in controlling human parturition. This paper describes the expression of CRH, CRH receptors 1 and 2, and CRH binding protein (CRH-BP) in gestational tissue in late pregnancy. Placenta, myometrium, decidua, and fetal membranes were collected after uncomplicated pregnancies at term caesarian section before the onset of labour. The localisation and mRNA expression of CRH, CRH receptors, and CRH-BP were studied by immunohistochemistry and reverse transcription (RT)-PCR. CRH receptors were detected in placenta, myometrium, decidua, and fetal membranes. We demonstrated for the first time the presence of CRH receptors on resident macrophages and on endothelial cells. CRH receptor 1 mRNA was detected in all tissues investigated by RT-PCR, whereas CRH receptor 2 mRNA was restricted to myometrium and decidua. CRH mRNA was widely expressed in all tissue under study. Novel findings are also presented on the expression of CRH-BP in the myometrium. This widespread expression of the CRH system in gestational tissue suggests a paracrine role for CRH in the birth process (e.g. effects on macrophages and endothelial cells).

Carrier Proteins↗
PubMed2002

Characterization and identification of cytochrome P450 metabolites of arachidonic acid released by human peritoneal macrophages obtained from the pouch of Douglas.

Cytochrome P450 metabolism of arachidonic acid (AA) was investigated in human peritoneal macrophages which play a central role in chronic pelvic diseases in women (for example in endometriosis). The formation of eicosanoids other than prostaglandins (PGs) by these cells is still unknown. In non-activated macrophages obtained from women in the reproductive age, the main [(3)H]-AA metabolites coeluted with epoxyeicosatrienoic acids, dihydroxyeicosatrienoic acids (DHETs) and hydroxyeicosatetraenoic acids (HETEs) in reverse-phase HPLC. After zymosan activation a shift to PGs pathway was observed. Treatment with low doses of 2,3,7,8-tetrachlorodibenzo- p -dioxin increased the formation of a metabolite coeluting with 5,6-DHET. By gas chromatography/mass spectrometry 5,6-DHET (after beta-naphthoflavone induction), and 14,15-DHET as well as 11,12-DHET (after AA stimulation) were identified as major epoxygenase metabolites, respectively. The enantioselective formation of 12(S)-HETE was demonstrated by chiral-phase HPLC. Our findings demonstrate that non-activated peritoneal macrophages produce substantial amounts of bioactive cytochrome P450 metabolites of AA.

Arachidonic Acid↗
PubMed2001

Acne resolution rates: results of a single-blind, randomized, controlled, parallel phase III trial with EE/CMA (Belara) and EE/LNG (Microgynon).

BACKGROUND AND OBJECTIVE: Acne in women can often be successfully treated by the intake of oral contraceptives containing gestagens with anti-androgenic properties. This study aimed to evaluate the efficacy of the monophasic oral contraceptive ethinylestradiol/chlormadinone acetate (EE/CMA; Belara for the treatment of mild to moderate papulopustular acne of the face and acne-related disorders in comparison to EE/levonorgestrel (LNG; Microgynon. METHODS: 199 female acne patients were enrolled in a single-blind, randomized, multicentre phase III study and divided into two groups who received either EE/CMA or EE/LNG. The primary end point was fulfilled if the number of papules/pustules per half of the face present on admission had decreased by at least 50% in the 12th medication cycle. RESULTS: 59.4% of the women under EE/CMA and 45.9% under EE/LNG were responders. The relative frequency of women with complete resolution was 16.5% under EE/CMA and 4.3% under EE/LNG at cycle 12. CONCLUSION: EE/CMA is an efficient treatment for women with mild and moderate papulopustular acne of the face and related disorders, reflecting the well-known anti-androgenic properties of the progestogen CMA.

Acne Vulgaris↗
PubMed2001

Effects of nitric oxide donors on the contractility and prostaglandin synthesis of myometrial strips from pregnant and non-pregnant women.

Nitric oxide (NO) is a potent relaxant of smooth muscle and possibly plays a role in maintaining uterine quiescence during pregnancy. Clinical studies have shown beneficial effects of the stable NO donor glyceryl trinitrate (GTN) for the inhibition of pathological myometrial contractility that occurs in preterm labor or dysmenorrhea. Since there are contradictory results regarding the mediation of the relaxing effect of NO, the myometrial prostaglandin synthesis during superfusion with NO donors was studied. Human myometrial strips obtained either at term Cesarean sections before the onset of labor or after hysterectomies in premenopausal women were studied in a superfusion system. After the manifestation of spontaneous contractions, GTN was added in low doses comparable with in vivo levels (0.4-40 nM) and the effect on myometrial activity, intracellular cGMP and prostaglandin production was analyzed. Additionally, the effect of sodium nitroprusside (SNP)--which releases NO spontaneously--was compared with that of GTN. GTN caused a significant decrease in the contraction frequency of myometrial strips from both pregnant and non-pregnant women similar to that of SNP. There was no significant change in the myometrial synthesis of PGI2, PGF2 alpha and PGE2, whereas the intracellular cGMP content was increased. In conclusion, GTN showed a significant inhibitory effect on human myometrium in vitro in very low doses and therefore represents an interesting therapeutic alternative for the treatment of preterm labor and dysmenorrhea. GTN in low doses did not alter the prostaglandin synthesis of human myometrium.

Cyclic GMP↗
PubMed2000

Exposure of human endometrium to environmental estrogens, antiandrogens, and organochlorine compounds.

OBJECTIVE: To determine concentrations of environmental estrogens, antiandrogens, and organochlorine compounds in human endometrium and body fat. DESIGN: Cross-sectional, population-based study. SETTING: Patient recruitment was done at a university hospital; chemical analysis was performed in a specialized private laboratory. PATIENT(S): Premenopausal, unexposed women undergoing hysterectomy for uterine myoma. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Concentrations of environmental modulators in human endometrium and body fat were quantified by high-resolution gas chromatography/high-resolution mass spectrometry. RESULT(S): Among known endocrine modulators, the antiandrogenic p, p'-dichlorodiphenyl-dichloroethylene was found in the highest concentrations in endometrium (median 4.7 microg/kg wet weight) and body fat (median 446 microg/kg wet weight). Only trace amounts of the identified environmental estrogens beta-hexachlorocyclohexane, o, p'-dichlorodiphenyl-trichloroethane, bisphenol A, hydroxylated polychlorinated biphenyls, and genistein were found in the endometrium (median <1 microg/kg wet weight). As major organochlorine contaminants without endocrine activities, polychlorinated biphenyls and hexachlorobenzene were found. CONCLUSION(S): Our data demonstrate that nonchlorinated environmental estrogens do not build up cumulative tissue concentrations in the endometrium. The risk of reduced fertility because of ambient levels of environmental estrogens in the endometrium is negligible.

Adult↗
PubMed2000

Formation of proinflammatory cytokines in human term myometrium is stimulated by lipopolysaccharide but not by corticotropin-releasing hormone.

Human term myometrium is poorly characterized as a source of proinflammatory mediators involved in parturition. We have investigated the basal expression of cytokines in myometrium, as well as the effects of CRH and lipopolysaccharide (LPS) on cytokine release. Explants from term myometrium were challenged with CRH or LPS (1 microg/mL each) in short-term tissue culture. Interleukin (IL)-1beta++, IL-6, IL-8, and tumor necrosis factor (TNF)alpha concentrations in the medium were quantified by enzyme immunoassay. The major cytokines released after 24 h were IL-6 and IL-8. All cytokines investigated were stimulated significantly by LPS (P: < 0. 05) but not by CRH. Messenger RNA levels of these cytokines were investigated by RT-PCR. IL-1beta+ and IL-6 messenger RNA were present in preterm and term myometrium before and during labor, whereas IL-8 and TNFalpha were expressed only by myometrium in active labor. Furthermore, myometrial CRH receptors and macrophages were characterized immunohistochemically. We conclude that human term myometrium is a site of production of proinflammatory cytokines and is involved in the inflammation-like reactions mediating the birth process. Cytokine release in term myometrium seems not to be under control of CRH.

Adult↗
PubMed2000

Low density lipoprotein (LDL) subfractions during pregnancy: accumulation of buoyant LDL with advancing gestation.

Pregnancy is accompanied by changes in the maternal lipoprotein metabolism that may serve to satisfy the nutritional demands of the fetus. In this study lipoprotein metabolism was investigated in 23 women during normal pregnancy in the first, second, and third trimesters and in 15 healthy nonpregnant women with regular menstrual cycles. Lipid and apolipoprotein concentrations were measured in total plasma, very low density, intermediate density, low density (LDL), and high density lipoproteins, and in each of six LDL subfractions. During early pregnancy, triglycerides, and dense LDL were higher than in the nonpregnant state. With advancing gestation, triglycerides increased and the distribution of apolipoprotein B-100-containing lipoproteins became increasingly dominated by the accumulation of very low density and intermediate density lipoproteins and buoyant, triglyceride-rich LDL. This is the first study that investigates LDL subfractions in pregnancy using a method that strictly separates LDL subfractions by virtue of density. The accumulation of buoyant, triglyceride-rich lipoproteins may be related to the down-regulation of maternal lipase activities by placental hormones. As a consequence, the metabolic changes of late pregnancy may result in an increased flux of lipoprotein-derived lipids to the placenta, which, with advancing gestation, increasingly expresses receptors with a high affinity for triglyceride-rich lipoproteins.

Adult↗
PubMed1999

Altered lipid metabolism in preeclampsia and HELLP syndrome: links to enhanced platelet reactivity and fetal growth.

Normal pregnancy is a physiological condition of balanced hypercoagulability. However, in preeclamptic pregnancies, the coagulation and fibrinolytic cascades are highly activated, accompanied by pathological blood rheology and endothelial dysfunction. This may result in disseminated intravascular coagulation (DIC). Atherosclerosis research showed that lipids may interfere with coagulation and cause endothelial dysfunction. Therefore, we analyzed the lipoprotein distribution and platelet counts in uncomplicated preeclamptic and HELLP syndrome pregnancies. In addition, a correlation between the fetal circulation determined by Doppler velocimetry and the maternal lipid metabolism was investigated. Fasting serum was collected from 24 women in the third trimester of uncomplicated pregnancies, 9 women with severe preeclampsia, and 6 women with HELLP syndrome. Cholesterol (CH), triglycerides (TGs), and apolipoproteins were analyzed in serum and in very-low-density (VLDL), intermediate-density (IDL), low-density (LDL), and high-density (HDL) lipoproteins separated by ultra-centrifugation. Compared with normal pregnancies, TGs in serum, VLDL, IDL, LDL, and HDL were significantly increased in preeclampsia; no difference in CH concentrations was observed. During HELLP syndrome, IDL-TGs were increased compared with normal pregnancies. There was no clear correlation between fetal hemodynamics and maternal lipid metabolism, but there was a significant negative correlation between maternal platelet counts and serum TG levels. Because TG-rich particles may play an important role in thrombin generation and may induce platelet aggregation, the observed changes in lipoprotein metabolism in preeclampsia and HELLP syndrome may contribute to the coagulopathy seen in these conditions.

Adult↗
PubMed1998

Efficacy and safety of the new antiandrogenic oral contraceptive Belara.

The aim of this open, noncontrolled phase III study was the assessment of the contraceptive efficacy and the evaluation of the safety of long-term use of Belara (30 micrograms ethinyl estradiol plus 2 mg chlormadinone acetate). Furthermore, cycle stability during administration of Belara and the influence of Belara on acne and seborrhea as clinical signs of androgenization were observed. Belara was taken by 1655 women for a total of 22,337 cycles. For the theoretical Pearl index, a value of 0.269 (95% CI [0.109, 0.600]) was calculated. In 1655 of 22,337 cycles (7.4%), no withdrawal bleeding was documented, whereas in 2565 of 22,308 cycles (11.5%), spottings and, in 786 of 22,308 cycles (3.5%), breakthrough bleeding occurred. After the intake of Belara for 12 cycles, acne on the face/neck improved in 64.1% of the women (209 of 326). In 53.4% of the women (175 of 326), acne disappeared completely. Seborrhea improved after 12 cycles in 89 of 131 women (67.9%), of whom 76 women (58.0%) were completely cured. Sixty-two serious adverse events (SAE) occurred in 59 of 1655 women. Accidents and injuries of the musculoskeletal system were the SAE with the highest incidence (0.66%). Two cases of deep venous thrombosis, one pulmonary embolism, and two cases of visual disturbances were observed. Only for the two cases of deep venous thrombosis could a relation to Belara be assumed. Of the adverse events commonly reported for oral contraceptives, headache was observed for the first time under study medication in 37.4%, nausea in 23.1%, breast tenderness in 21.7%, and vaginal discharge in 19.4% of the women. The frequency of adverse events decreased with longer duration of a drug consisting of intake of Belara. In conclusion, Belara can be described as an effective and safe oral contraceptive with marked antiandrogenic properties.

Acne Vulgaris↗