Introduction: Acute subdural hematoma (aSDH) removal is one of the most commonly performed procedure in neurosurgery. Complications of those surgeries which require reoperation are associated with higher risk of poor treatment outcome. Th erefore we decided to analyse potential factors which might be associated with risk of early reoperation among patients who underwent aSDH surgery. Material and methods: We retrospectively analysed 328 patients treated due to aSDH. From their medical records we obtained detailed medical history. Early reoperation was defi ned as reoperation during the same hospital stay. To determine the potential predictors of early reoperation we used univariate and multivariate logistic regression analyses. Results: A total of 20 (6.09%) patients required early reoperation. Th ose patients had signifi cantly higher International Normalized Ratio (INR) upon admission (1.96 ± 2.55 vs. 1.26 ± 0.50; p <0.01) and signifi cantly higher Prothrombin Time (PT) upon admission (21.84 ± 27.10 vs. 13.40 ± 3.45; p <0.01). In multivariate logistic regression analysis aft er adjustment for all possible confounders higher INR (OR: 1.762; 95% CI: 1.017–22.840; p = 0.045) remained independently associated with higher risk of early reoperation among patients with aSDH. Conclusions: Patients with higher INR and PT upon admission are at higher risk of early reoperation. Higher INR is independently associated with higher risk of early reoperation among patients with aSDH.

This study investigated the improvement in the electrical conductivity and mechanical properties obtained by adjusting the amount of the Sr addition to the Al-Zn-Mg-Mn alloy. The addition of Sr formed an intermetallic compounds, and the volume fraction of the intermetallic compounds increased with increasing Sr content. As the amount of Sr added increased from 0 to 1.0 wt%, the electrical conductivity of the extruded alloy decreased to 48.9, 45.2 and 42.5% IACS. As the addition amount of Sr increased, the average grain size of the rolled alloy decreased to 55.5, 53.1 and 42.3 μm. And, the ultimate tensile strength increased to 195, 212 and 216 MPa.

The bioindicative research conducted in 1998 concerned the soil polluted by lead in the region ofGlass Factory in Krosno. Potato beetle larvae descending to soil for pupation were the soil bioindicator. Samples of soil were collected in the distance of 500 to 1,000 m from the factory emitters, and later the lead content was determined in the Chemical Agricultural Station in Rzeszów. The lead level in the l" pollution zone was 200.0 mg Pb/kg while in the 2"d zone 70.0 mg/kg, and in the soil sample from the control field the level was 12.0 mg/kg. The obtained results of the analysis conducted in the laboratory of the Regional Experimental Station did not show any significant differences between both the beetle mass which emerged from the soil, and their number from the control field and the experimental one.