There are about 1950 clinical studies being (or have been) conducted in Czech Republic. The country of the clinical trial is determined by the location of where the clinical research is being studied. Most studies are often held in multiple locations & countries.
The occurrence of postoperative cognitive dysfunction (POCD) might be related to intraoperative cerebral desaturation. Positioning for neurosurgical procedures are associated with head rotation, elevation, flexion or extention that may affect blood brain inflow and outflow. Anatomical variations of Willis circle could affect the cerebral blood flow in extreme head position with the development of cerebral ischemia or functional changes of brain. Investigators suppose that detection of cerebral tissue desaturation and its prompt correction could modify the occurence of POCD after these procedures.
The objective of this study is to establish whether patients with aortic aneurysm, compared to general population, have higher levels of selected miRNAs and whether there is significant association between the level of miRNA in circulating blood and the size of the aortic aneurysm or the risk of its rupture.
Pelvic organ prolapse, POP, is a common health problem affecting up to 40% of women. Very little is known about the factors associated with surgical failure. Studies have identified a variety of risk factors: younger age, high body mass index and advanced preoperative prolapse (grade III-IV) have been associated with an increased risk of reoperation in some studies. According to some studies patients had poorer anatomical outcome after traditional repairs but were able to enjoy the same quality of life as after transvaginal mesh surgery or laparoscopic sacrocolpopexy. The purpose of this study is to assess and compare the efficacy of these three procedures in a randomized controlled trial.
Based on a prospective study, to evaluate how pre-operative pelvic floor status - the presence of injury to the musculus levator ani - may influence the results of laparoscopic sacrocolpopexy. The investigators hope to confirm or disprove the hypothesis that the presence of such injury increases the risk of post-operative prolapse recurrence
Use of endovascular techniques - implantation of a peripheral stent graft and a peripheral flexible stent to isolate the sac of the popliteal artery aneurysm from the circulation and subsequent topical application of a thrombolytic (rtPA) to restore patency of the lower leg blood stream - will lead to a comparable or better outcome in treatment of patients with the popliteal artery aneurysm and acute critical limb ischaemia, compared to currently prevailing use of surgical treatment.
The study will compare two invasive methods (FFR -fractional flow reserve and iFR—instantaneous wave free ratio) for assessment of hemodynamic impact of coronary stenosis on myocardial perfusion. There is a very good correlation between these methods for the assessment of hemodynamic significance in a broad spectrum of lesions. However, this correlation decreases significantly near the cut off points for each method. The investigators will try to find possible explanations for these differences by detailed morphology assessment of coronary stenosis using optical coherence tomography (OCT), analysis of gene polymorphisms that play a role in vasodilatation, and by shear stress analysis. The head-to-head comparison between FFR and iFR is not simple, because there is no "gold standard" for assessment of hemodynamic significance. Studies comparing these methods have used hyperemic stenosis resistance (HSR). For this kind of measurement it is necessary to measure the speed of blood flow. This is usually done by a Doppler analysis of flow. Unfortunately, the Doppler signal can yield many artificial or erroneous indicators, and obtaining a good quality signal is frequently time-consuming. These are the reasons that HSR has not been used in routine practice. The investigators have developed a new console and software that can provide real time analysis of the Doppler signal. It allows us to easily measure HSR, and to differentiate between the FFR and iFR measures through intrabeat analysis of microvascular resistance (lowest microvascular resistance is an essential condition for proper pressure measurement). Using this tool, it is possible to automatically identify the point of lowest microvascular resistance during each cardiac beat. The pressure gradient can then be measured at that point. This approach can eliminate almost all uncertainties in assessment of the pressure gradient produced by coronary stenosis. This tool can potentially improve the existing methods used to precisely reveal a significant stenosis. This should increase the number of hemodynamic guided procedures.
Study was designed to evaluate efficacy of mucolytic solution ingested before upper endoscopy on visibility of gastric mucosa.
The main purpose of this study is the determination of the in-vivo ultrafiltration coefficient (in-vivo KUF) for Diacap Pro dialyzers following routine dialysis prescription in the United States.
The purpose of this study is to confirm anticipated substitution dose of the vitamin D for sustained blood level during winter time in patients with inflammatory bowel diseases (IBD)