Research on vibroacoustic phenomena of tram vehicles for the changeable dynamics conditions

The article addresses the methodology and the results of studies of vibroacoustic phenomena generated by tram vehicles. While a tram was running at various speeds, both the noise level and surface vibrations were recorded simultaneously. These quantities determine the overall impact of tram cars on their environment. The research assumptions made enable assessment of accretion of these effects in the function of running speed, which may prove particularly for the sake recommendations as to the permissible speed of trams in urban conditions

Passenger safety and information module in intelligent integrated traffic management system

The article presents selected components of the prototype of the integrated system of supporting information management in passenger traffic (the polish acronym of the system is ZSIKRP Demonstrator+). The system is equipped with significantly expanded range of offered functionality, which corresponds to the current demands of the market. Additionally, it has features distinguishing it from other products available on the market. Prototypes of the system installed in two versions: for electric (EZT) vehicle (EN57 1756 – type in Mazovia Railways) and diesel (SZT) (SA 132 006 – type in regional public transport) vehicle. ZSIKRP system also focuses on ensuring the safety of travelers in both types of vehicles: EN57 1756 (EZT) and SA 132 006 (SZT). It is done by installation of the collision and threats detection module, thus it will be possible to transfer information about possible emergency situation to supervision center and immediately to crisis management center. Particular attention has been given to test collision and threats detection module and stabilization of measurements

Quantitative myocardial blush score (QuBE) allows the prediction of heart failure development in long-term follow-up in patients with ST-segment elevation myocardial infarction: Proof of concept study

Background: Acute myocardial infarction (AMI) might lead to left ventricular remodeling. Adequate myocardial perfusion is critical to prevent this adverse remodeling. Quantitative myocardial blush evaluator (QuBE) software, available on-line, is a simple analysis tool which enables the precise quan­tification of myocardial perfusion in the infarct area immediately after interventional treatment. The aim of this study was to assess whether the results of QuBE analysis might predict the development of heart failure (HF) in AMI patients in 3 year-long follow-up. Methods: Ninety five patients with first AMI, single vessel coronary artery disease, Killip class I at presentation were enrolled in the study. Angiograms were reanalyzed using the on-line QuBE software. Data on heart failure development (ICD 10 codes I50) provided by the National Health Fund were considered as primary outcome. Results: QuBE values ranged from 0.0 to 25.3 arbitrary units, mean value was 9.9 ± 5.2 arbitrary units. QuBE correlated positively with myocardial blush grade (MBG; Spearman R = 0.342 at p < 0.05). Multivariate Cox proportional hazard modeling, adjusted for initial Thrombolysis in Myocardial In­farction (TIMI flow, and TIMI thrombus grade indicated QuBE score (1 unit increase — HR 0.919, 95% CI 0.846–0.999, p = 0.049) and left ventricular ejection fraction at discharge (1% increase — HR 0.936, 95% CI 0.902–0.971, p = 0.000) as independent predictors of HF development. Conclusions: The QuBE assessment of myocardial perfusion allows the prediction of HF development in the post-infarction period in this highly selective group of patients

Sleep Position Detection with a Wireless Audio-Motion Sensor—A Validation Study

It is well documented that body position significantly affects breathing indices during sleep in patients with obstructive sleep apnea. They usually worsen while changing from a non-supine to a supine position. Therefore, body position should be an accurately measured and credible parameter in all types of sleep studies. The aim of this study was to specify the accuracy of a neck-based monitoring device (Clebre, Olsztyn, Poland) mounted at the suprasternal notch, in determining a supine and non-supine sleeping position, as well as specific body positions during sleep, in comparison to polysomnography (PSG). A sleep study (PSG along with a neck-based audio-motion sensor) was performed on 89 consecutive patients. The accuracy in determining supine and non-supine positions was 96.9%±3.9% and 97.0%±3.6%, respectively. For lateral positions, the accuracy was 98.6%±2% and 97.4%±4.5% for the right and left side, respectively. The prone position was detected with an accuracy of 97.3%±5.6%. The study showed a high accuracy in detecting supine, as well as other gross positions, during sleep based on a sensor attached to the suprasternal notch, compared to the PSG study. We feel that the suprasternal notch is a promising area for placing wireless sleep study devices