A tumor-targeting drug delivery system consists of a tumor recognition moiety and a directly linked cytotoxic agent or an agent attached to a water-soluble synthetic polymer carrier through a suitable linker. Conjugation of a drug with a polymer carrier can change its solubility, toxicity, biodistribution, blood clearance and therapeutic specificity. Increased therapeutic specificity of a polymer drug can be achieved by the attachment of a targeting moiety (e.g. a lectin, protein, antibody, or peptide) that specifically interacts with receptors on the target cells. A large number of tumor-specific peptides were described in recent years. After a short introduction, some important examples of peptide-targeted conjugates will be described and discussed., E. Böhmová, R. Pola., and Obsahuje bibliografii
Cíl práce: Upozornit na problematiku apendicitidy v graviditě. Typ práce: kazuistika. Vlastní pozorování: Formou kazuistiky prezentovaný výskyt perforované apendicitidy s difuzní peritonitidou ve 27. týdnu gravidity. Následný porod císařským řezem ve 36. týdnu a komplikované pooperační období a infekční komplikace v šestinedělí. Závěr: Apendicitida v těhotenství je spojována se zvýšenou mateřskou a fetální morbiditou. Perforace apendixu přispívá ke zvýšenému riziku dalších komplikací, které zahrnují např. předčasný porod, abort a mateřské komplikace, zejména infekční. Včasná diagnóza s následnou operací může snížit mateřskou i fetální morbiditu., Objective: To draw attention to the issue of appendicitis in pregnancy. Design: Case report. Case report: We present a case study in the form of a case of occurrence of appendicitis with peritonitis in 27 weeks pregnancy. And describes the birth and childbed, which is complicated by infectious complications. Conslusion: Appendicitis in pregnancy is associated with increased maternal and fetal morbidity and even more in case of peritonitis. Delay surgical intervention correlates with increased risk of perforation, which contributes to the increase of other complications, including premature birth, abortion and maternal complications. Prompt diagnosis and early surgery can reduce maternal and fetal morbidity., and Renáta Hlistová
The purpose of the present study was to define the indirect central effect of hydrogen sulfide (H2S) on baroreflex control of sympathetic outflow. Perfusing the isolated carotid sinus with sodium hydrosulfide (NaHS), a H2S donor, the effect of H2S was measured by recording changes of renal sympathetic nerve activity (RSNA) in anesthetized male rats. Perfusion of isolated carotid sinus with NaHS (25, 50, 100 μmol/l) dose and timedependently inhibited sympathetic outflow. Preconditioning of glibenclamide (20 μmol/l), a ATP-sensitive K+ channels (KATP) blocker, the above effect of NaHS was removed. With 1, 4-dihydro-2, 6-dimethyl-5-nitro-4-(2-[trifluoromethyl] phenyl) pyridine-3-carboxylic acid methyl ester (Bay K8644, 500 nmol/l) pretreatment, which is an agonist of L-calcium channels, the effect of NaHS was eliminated. Perfusion of cystathionine γ-lyase (CSE) inhibitor, DL-propargylglycine (PPG, 200 μmol/l), increased sympathetic outflow. The results show that exogenous H2S in the carotid sinus inhibits sympathetic outflow. The effect of H2S is attributed to opening KATP channels and closing the L-calcium channels., Qi Guo, Yuming Wu, Hongmei Xue, Lin Xiao, Shneg Jin, Ru Wang., and Obsahuje bibliografii
Perigraft serom je poměrně vzácná komplikace, která může vzniknout po implantaci cévní protézy z dakronu nebo expandovaného polytetrafluoretylenu (ePTFE). Předkládáme kazuistiku 54letého pacienta s perigraft seromem okolo axillofemorálního bypassu (ePTFE protézou). Konečným řešením byla explantace této extraanatomické rekonstrukce a implantace aortobiilického bypassu s použitím cévní protézy z jiného materiálu. Článek diskutuje terapeutické možnosti této komplikace na základě publikovaných prací. Žádná guidelines ani jiná doporučení neexistují. Závěrem, přístup k léčbě perigraft seromu zůstává striktně individuální. Náhrada cévní protézy s použitím implantátu z jiného materiálu se zdá být nejlepší možností řešení pro recidivující perigraft seromy tam, kde jiné méně invazivní postupy selhaly., Perigraft seroma is quite a rare complication that may occur after implantation of Dacron or expanded polytetrafluoroethylene (ePTFE) vascular grafts. We report a case of a 54-year-old patient with perigraft seroma around an axillofemoral bypass (ePTFE graft). Definitive treatment involved the explantation of this extraanatomic bypass with perigraft seroma and the implantation of an aortobiiliac bypass using vascular prosthesis made of a different material. Based on published studies, therapeutic options for this complication are discussed. No guidelines or recommendations are available. In conclusion, the approach to perigraft seroma treatment remains strictly individual. Vascular graft replacement using grafts made of different material seems to be the best option in the case of recurring perigraft seroma, where less invasive procedures were not successful., and A. Gazi, R. Staffa, T. Novotný, Z. Kriz, M. Hermanová
The most dramatic changes in pulmonary circulation occur at the time of birth. We hypothesized that some of the effects of perinatal hypoxia on pulmonary vessels are permanent. We studied the consequences of perinatal exposure to hypoxia (12 % O2 one week before and one week after birth) in isolated lungs of adult male rats (~12 weeks old) perfused with homologous blood. Perfusion pressure-flow relationship was tilted towards lower pressures in the perinatally hypoxic as compared to the control, perinatally normoxic rats. A non-linear, distensible vessel model analysis revealed that this was due to increased vascular distensibility in perinatally hypoxic rats (4.1±0.6 %/mm Hg vs. 2.3±0.4 %/mm Hg in controls, P = 0.03). Vascular occlusion techniques showed that lungs of the perinatally hypoxic rats had lower pressures at both the pre-capillary and post-capillary level. To assess its role, basal vascular tone was eliminated by a high dose of sodium nitroprusside (20 µM). This reduced perfusion pressures only in the lungs of rats born in hypoxia, indicating that perinatal hypoxia leads to a permanent increase in the basal tone of the pulmonary vessels. Pulmonary vasoconstrictor reactivity to angiotensin II (0.1-0.5 µg) was reduced in rats with the history of perinatal hypoxia. These data show that perinatal hypoxia has permanent effects on the pulmonary circulation that may be beneficial and perhaps serve to offset the previously described adverse consequences., V. Hampl, J. Bíbová, J. Herget., and Obsahuje bibliografii
Perineální hernie je kýla prostupující defektem v pánevním dnu. Primární hernie jsou extrémně vzácné, častěji se jedná o onemocnění sekundární po operacích v pánvi, zejména po abdominoperineálních resekcích či exenteracích pánve. Jako nejvýznamnější rizikové faktory pro vznik onemocnění jsou uváděny poruchy hojení perineální rány a neoadjuvantní chemoradioterapie u nemocných s maligním onemocněním. Lze očekávat nárůst výskytu tohoto onemocnění v souvislosti s využíváním laparoskopických přístupů a ELAPE. I přes značný odstup od první popsané operace chybějí soubory pacientů, studie i doporučené postupy řešení. Autoři prezentují kazuistiku 66letého nemocného se sekundární perineální hernií po předchozí laparoskopické abdominoperineální resekci rekta pro adenokarcinom, u něhož byla provedena plastika kýly z abdominálního přístupu a k uzávěru defektu bylo využito stopkovaného laloku m. rectus abdominis., Perineal hernia is defined as a protrusion of intra-abdominal viscera through a defect in the pelvic floor. Primary hernias are extremely rare; secondary (postoperative) hernias following pelvic surgery, especially abdominoperineal resection or pelvic exenteration, are more common. Impaired perineal wound healing and neoadjuvant chemoradiotherapy in cancer patients are defined as main risk factors. A growing incidence of this complication is expected in connection with an increasing use of laparoscopic approaches and ELAPE. Despite the considerable time since the first described secondary perineal hernia in literature, patient series, prospective studies and treatment guidelines are still missing. The authors present a case of a 66-year-old man with secondary perineal hernia following a previous laparoscopic abdominoperineal resection for rectal cancer undergoing a surgical intervention. This was performed through an abdominal approach using a rectus abdominis muscle flap to repair the pelvic floor defect., and M. Bocková, J. Hoch, L. Frajer
Three variants of geophysical excitations and seven different VLBI solutions of celestial pole offsets (CPO) are used to determine period and Q-factor of Free Core Nutation (FCN). Brzeziński’s broad-band Liouville equations (Brzeziński, 1994) are numerically integrated to derive geophysical effects in nutation in time domain. Possible effect of geomagnetic jerks (GMJ) is also considered. Best-fitting values of FCN parameters are estimated by least-squares fit to observed CPO, corrected for the differences between the FCN parameters used in IAU 2000 model of nutation and newly estimated ones; MHB transfer function is used to compute these corrections. It is demonstrated that different VLBI solutions lead to FCN parameters that agree on the level of their formal uncertainties, but different models of geophysical excitations change the results more significantly. Using GMJ excitations always brings improvement of the fit between integrated and observed CPO. The obtained results show that the best fit is achieved when only GMJ excitations are used. Our conclusion is that GMJ are very probably more important for exciting FCN than the atmosphere and oceans. Empirical Sun-synchronous correction, introduced in the present IAU 2000 nutation model, cannot be explained by diurnal atmospheric tidal effects., Jan Vondrák and Cyril Ron., and Obsahuje bibliografii
Two geodynamic test transects across the Polish segment of the Western Carpathians, crossing the Orava Basin in the west (KO) and the Pieniny Klippen Belt and Magura Nappe along the Dunajec River valley in the east (DD), are presented. Multidisciplinary studies conducted along these transects incl uded gravimetric, geodetic, geologic and morphostructural investigations. Gravimetric and geodetic results appear to suggest recent subsidence of the Orava Basin, particularly intensive in the Wróblówka Graben, confirming conclusions derived from geomorphic analyses. Data ob tained for the Dunajec River transect do not show any particular differentiation among individual benchmarks, what can point to either minor uplift of the entire area (already suggested by the results of geomorphic and morphotectonic studies), minimal differences between successive slices of the Magura Nappe and the Pieniny Klippe n Belt, or both. Horizontal displacements of benchmarks, different for the KO and DD transects, towa rds the west and SW as well east and SE, respectively, can result from general uplift of the area comprised between these transects, i.e. the Gorce Mts., Monika Łój, Janusz Madej, Sławomir Porzucek and Witold Zuchiewicz., and Obsahuje bibliografické odkazy