RESUMEN
This article examines the entropy generation in the magnetohydrodynamics (MHD) flow of Newtonian fluid (water) under the effect of applied magnetic in the absence of an induced magnetic field. More precisely, the flow of water is considered past an accelerated plate such that the fluid is receiving constant heating from the initial plate. The fluid disturbance away from the plate is negligible, therefore, the domain of flow is considered as semi-infinite. The flow and heat transfer problem is considered in terms of differential equations with physical conditions and then the corresponding equations for entropy generation and Bejan number are developed. The problem is solved for exact solutions using the Laplace transform and finite difference methods. Results are displayed in graphs and tables and discussed for embedded flow parameters. Results showed that the magnetic field has a strong influence on water flow, entropy generation, and Bejan number.
RESUMEN
BACKGROUND: Apart from few small single-center studies, there are limited data about STEMI patients in Egypt. Nineteen Egyptian centers (with and without PCI facilities) participated in this registry with 1356 patients who were compared to 7420 patients from other ESC countries. The aims of this study were to describe the characteristics of patients with STEMI, to assess STEMI management patterns particularly the current use of reperfusion therapies, to evaluate the organization of STEMI networks across Egypt, to evaluate in-hospital patient outcome, and to compare Egyptian patients with other ESC countries. RESULTS: Compared to other ESC countries, Egyptian patients were younger (mean age 55.4 ± 11.3 vs. 62.9 ± 12.4; p < 0.001 and 4.36% vs. 19.41%% were ≥ 75 years old; p < 0.001) with fewer females (18.44% vs. 25.63%; p < 0.001). Egypt had longer median time between symptoms onset and first medical contact: 120.0 (60.0; 240.0) vs.100.0 (50.0; 240.0) p < 0.001. Self-presentation rather than EMS presentation was the mode of admission in 86.06% in Egypt vs. 25.83% in EU countries (p < 0.001). On qualifying ECG, anterior STEMI was in 57.08% in Egypt vs. 45.98% in other countries (p < 0.001). Initial reperfusion therapy was 49.12%, 43.07%, and 7.26% for primary PCI, thrombolytic therapy and no reperfusion in Egypt vs. 85.42%, 7.26%, and 7.82% for EU countries, respectively. In-hospital mortality was 4.65% in Egypt vs. 3.50% in other countries p 0.040 and was 18.87% in no reperfusion vs. 2.10% in primary PCI vs. 4.97% in thrombolysis (p < 0.001) among Egyptians. Patients were discharged on aspirin in 98.61%, clopidogrel in 91.07%, ticagrelor in 7.31%, DAPT in 97.69%, beta blockers in 82.83%, ACE inhibitors in 84.76%, MRAs in 10.01%, and statins in 99.77%. CONCLUSION: Compared to other ESC countries, Egyptian STEMI patients were younger, more frequently current smokers and diabetics, and had longer time between symptoms onset and first medical contact with more self-presentation rather than EMS presentation. Thrombolytic therapy is still a common reperfusion therapy in Egypt while primary PCI was offered to half of the patients. In-hospital mortality was significantly higher in Egypt and was highest among no reperfusion patients and lowest among PPCI patients.