Cardiologia CROATICA Aim of this article is to present the state-of-the-art antithrombotic therapy for the secondary prevention of cardioembolic stroke due to new ESC, ACC, and ACCP guidelines which are the key-opinion guidelines in atrial fibrillation (AF). The statements are based on CHADS2 scoring calculation as well as newly developed CHA2DS2-VASc. Statements: for the patients (pts) with a history of ischemic stroke (IS) or TIA and AF, including paroxysmal AF, guidelines recommend oral anticoagulation (Grade IA), aspirin (Grade IB), or aspirin and clopidogrel (Grade IB). In pts with a history of IS or TIA and AF, guidelines suggest dabigatran 150 mg bid over adjusted-dose VKA (INR 2.0-3.0) (Grade IIB). ESC guidelines recommend for pts with CHA2DS2VASc Score 2, VKA therapy (INR 2,0-3,0), or direct thrombin inhibitor dabigatran, or an oral direct Xa factor inhibitors — rivaroxaban or apixaban (Grade IA). In pts with a history of IS or TIA and AF, who are unsuitable for or choose not to take an oral anticoagulant, guidelines recommend dual therapy, aspirin and clopidogrel (Grade IB). Recommendation is that oral anticoagulation should generally be initiated within 1 to 2 weeks after stroke onset. Earlier anticoagulation can be considered for pts at low risk of bleeding complications i.e. patients with a small infarct burden and no evidence of hemorrhage on brain imaging. Delaying anticoagulation should be considered for pts at high risk of hemorrhagic complications — those with extensive infarct burden or evidence of significant hemorrhagic transformation on brain imaging. In patients with a history of noncardioembolic IS or TIA, guidelines recommend long-term treatment with aspirin (75-100 mg once daily), clopidogrel (75 mg once daily), aspirin/extended-release dipyridamole (25 mg/200 mg bid), or cilostazol (100 mg bid) (Grade IA), VKA (Grade IB), the combination of clopidogrel plus aspirin (Grade IB), or triflusal (Grade IIB). Of the recommended antiplatelet regimens, guidelines suggest clopidogrel or aspirin/extended-release dipyridamole over aspirin (Grade IIB) or cilostazol (Grade IIC). Conclusions: It is an ongoing trend that recommendations follow CHADS2 scoring calculation as well as CHA2DS2VASc Score. Standard of care is based on net clinical benefit i.e. balance between clinical/prevention benefit and safety profile. Still there is a question mark: what to suggest for patients who are unsuitable for oral anticoagulants, for reasons other than major bleeding risk.

Aim of this study was to recognize differences in long-term clinical outcome after femoral neck fracture and hip endoprosthesis implantation. Total of 145 patients were examined, 32 patients with unipolar, 70 with bipolar and 43 patients with total hip endoprosthesis. The mean values of Harris hip score, after 3.8 ± 1.9 years, were: 72.1 ± 17.8, 74.27 ± 19.1, 78.2 ± 22.5 for patients with unipolar, bipolar and total hip endoprosthesis, respectively. No statistically significant difference was observed (p=0.704). The in-hospital mortality rates were: 4.3%, 4.6%, and 5.3% for groups of patients with bipolar, unipolar and total hip endoprosthesis, respectively. Considering clinical outcomes, general health and costs, it could be concluded that choice of endoprosthesis does not pose an obstacle in patient’s recovery.

Resistive switching offers a promising route to universal electronic memory, potentially replacing current technologies that are approaching their fundamental limits. In many cases switching originates from the reversible formation and dissolution of nanometre-scale conductive filaments, which constrain the motion of electrons, leading to the quantisation of device conductance into multiples of the fundamental unit of conductance, G0. Such quantum effects appear when the constriction diameter approaches the Fermi wavelength of the electron in the medium – typically several nanometres. Here we find that the conductance of silicon-rich silica (SiOx) resistive switches is quantised in half-integer multiples of G0. In contrast to other resistive switching systems this quantisation is intrinsic to SiOx and is not due to drift of metallic ions. Half-integer quantisation is explained in terms of the filament structure and formation mechanism, which allows us to distinguish between systems that exhibit integer and half-integer quantisation.

The predictive value of cystatin C as a marker of course of the disease has been evaluated. Fifty-two pairs of serum samples of patients with B non-Hodgkin lymphoma have been collected at the time of diagnosis and before fourth cycle of chemotherapy. The levels of cystatin C, CRP, β 2M, LDH, and IL-6 in samples have been measured, and clinical parameters of course of the disease (B symptoms, clinical stage, patients' age, and IPI) have been noted. In total patient's group cystatin C levels correlated with β 2M and IPI. In aggressive lymphomas, the inhibitor levels correlated with clinical stage of disease and were significantly higher in patients with elevated LDH activity. In aggressive nodal lymphomas its levels correlated with β 2M, IPI, and clinical stage of disease. The cystatin C level was significantly increased in total group of patients over 60 years old, while in particular types of lymphoma, no statistical significance has been obtained. Our results indicate that cystatin C should be taken into consideration in disease monitoring. However, we expect that the disease-free and overall survival analysis will give the definitive answer about the reliability of cystatin C as an indicator of course of aggressive lymphomas.