Simple model of the density of states in 1D photonic crystal

In this paper, we present a simple, yet versatile, analytical model of one-dimensional photonic crystal (1D PC). In our theoretical model, we take into account direction of propagation and therefore do not neglect anisotropic nature of photonic crystals. We derive analytical expressions for mode spectrum and density of states in 1D photonic crystal. With those formulas, we obtain mode spectrum characteristics, which depict formation of photonic band gap and reveal properties of photonic crystals.Comment: presented at SPIE International Congress on Optics and Optoelectronics, Warszawa, Poland, 28.08-2.09.200

Calculation of atomic spontaneous emission rate in 1D finite photonic crystal with defects

We derive the expression for spontaneous emission rate in finite one-dimensional photonic crystal with arbitrary defects using the effective resonator model to describe electromagnetic field distributions in the structure. We obtain explicit formulas for contributions of different types of modes, i.e. radiation, substrate and guided modes. Formal calculations are illustrated with a few numerical examples, which demonstrate that the application of effective resonator model simplifies interpretation of results.Comment: Cent. Eur. J. Phys, in pres

Recent achievements in transcatheter closure of ventricular septal defects : a systematic review of literature and a meta-analysis

Background: Ventricular septal defect (VSD) is one of the most common congenital heart defects. Currently, surgery remains the treatment of choice. However, transcatheter techniques for closing of various types of VSDs have become an alternative. Aims: The objective of our study was to present the outcomes of transcatheter closure of various types of VSD based on a systematic review of recent publications. Methods: A systematic review of studies published in English between January 2014 and March 2020 was performed using the PubMed database (MEDLINE) independently by 2 reviewers. Data on success and complication rates were extracted. Studies including fewer than 5 patients and those with acquired VSD were excluded from the analysis. Results: Finally, 44 studies were included for analysis, with a total number of 4050 patients. The pooled estimate of the overall success rate based on the random effects model was 97.96% (95% CI, 97.37–98.56; Q test P 0.99; I 2 = 0%) for permanent VSD. Conclusions: Transcatheter closure of selected VSDs appears to be an effective and safe method of treatment. Recent studies have shown high rates of successful interventions with a low incidence of complications

Spatial and frequency domain effects of defects in 1D photonic crystal

The aim of this paper is to present the analysis of influence of defects in 1D photonic crystal (PC) on the density of states and simultaneously spontaneous emission, in both spatial and frequency domains. In our investigations we use an analytic model of 1D PC with defects. Our analysis reveals how presence of a defect causes a defect mode to appear. We show that a defect in 1D PC has local character, being negligible in regions of PC situated far from the defected elementary cell. We also analyze the effect of multiple defects, which lead to photonic band gap splitting.Comment: presented at International Workshop on Physics of Photonic Crystals and Metamaterials, Brussels, Belgium, 12-13.06.200

Vasodilatory efficacy and impact of papaverine on endothelium in radial artery predilatation for CABG surgery : in search for optimal concentration

Abstract Objective: The aim of this study was to compare the efficacy of two different papaverine concentrations (0.5 mg/ml and 2 mg/ml) for vasospasm prevention and their impact on endothelium integrity. Methods: We have studied distal segments of radial arteries obtained by no-touch technique from coronary artery bypass graft (CABG) patients (n=10). The vasodilatory effect of papaverine (concentrations of 0.5 mg/ml and 2 mg/ml) was assessed in vitro, in isometric tension studies using ex vivo myography (organ bath technique) and arterial rings precontracted with potassium chloride (KCl) and phenylephrine. The impact of papaverine on endothelial integrity was studied by measurement of the percentage of vessel's circumference revealing CD34 endothelial marker. Results: 2 mg/ml papaverine concentration showed stronger vasodilatatory effect than 0.5 mg/ml, but it caused significantly higher endothelial damage. Response to KCl was 7.35±3.33 mN for vessels protected with papaverine 0.5 mg/ml and 2.66±1.96 mN when papaverine in concentration of 2 mg/ml was used. The histological examination revealed a significant difference in the presence of undamaged endothelium between vessels incubated in papaverine 0.5 mg/ml (72.86±9.3%) and 2 mg/ml (50.23±13.42%), P=0.002. Conclusion: Papaverine 2 mg/ml caused the higher endothelial damage. Concentration of 0.5 mg/ml caused better preservation of the endothelial lining

Intrapericardial cisplatin combined with oral colchicine resulted in long term control of malignant pericardial effusion in the course of metastatic renal cancer

Introduction: Neoplastic pericardial effusion (NPE) represents a common cause of morbidity and mortality in patients with cancer. NPEpresents frequently as cardiac tamponade, requiring urgent pericardiocentesis or pericardiotomy, with subsequent pericardial fluid drainage.Despite high effectiveness of such procedures, the recurrence of effusion is noted in 30- 60% of patients. Intrapericardial therapy withcisplatin was found to be effective in NPE due to lung and breast cancer. Its role in cardiac tamponade due to renal cancer is unknown. Case presentation: We presented an 82-year-old man with renal cancer who was admitted to the Intensive Care Unit becauseof threatening pericardial tamponade due to NPE.Urgent subxiphoid pericardiotomy was performed with subsequent evacuation of 1000 ml of bloody fluid. On the inner surfaceof the pericardium, several pink nodules were found. Histological examination revealed carcinoma clarocellulare. In view of thepersistent high drainage of the pericardium, intrapericardial cisplatin therapy was performed. On the first day after surgery, colchicine0.5 mg/day/po was also introduced. No side effects of the treatment were observed. The patient died 12 months laterdue to cancer progression and cachexia. No recurrence of pericardial effusion was observed. Conclusion: This is the first case study demonstrating long-term efficacy and safety of intrapericardial cisplatin combined withoral colchicine in NPE due to metastatic renal cell carcinoma

Wpływ przezskórnej laserowej rewaskularyzacji mięśnia sercowego na dolegliwości dławicowe i tolerancję wysiłku pacjentów z oporną na leczenie dławicą piersiową - wyniki obserwacji odległej

Wstęp: Jedną z metod leczniczych pacjentów z oporną postacią dławicy piersiowej jest przezskórna laserowa rewaskularyzacja mięśnia sercowego (PMLR). Celem pracy była ocena odległego wpływu tego zabiegu na dolegliwości dławicowe i tolerancję wysiłku. Materiał i metody: U 25 pacjentów poddanych PMLR oceniono dolegliwości dławicowe według skali CCS oraz mierzono czas trwania próby wysiłkowej według zmodyfikowanego protokołu Bruce&#8217;a. Oceny dokonywano po 1, 3, 6, 12 i 24 miesiącach od zabiegu. Wyniki: Obserwowano znamienne obniżenie średniego poziomu dolegliwości dławicowych z 3,52 &plusmn; 0,51 do 2,54 &plusmn; 0,78 według klasyfikacji CCS (p < 0,0001) po 1 miesiącu od PMLR. Po 2 latach wartość ta wyniosła 2,78 &plusmn; 0,65 i była nadal znamiennie mniejsza niż przed zabiegiem. Czas trwania testu wysiłkowego wydłużył się znamiennie z 343 &plusmn; 78 s do 511 &plusmn; 131 s po 1 miesiącu (p = 0,003). W dalszej obserwacji zanotowano istotne skracanie się czasu trwania testu wysiłkowego. Po 2 latach wartość ta była jednak nadal znamiennie większa niż przed zabiegiem i wynosiła 408 &plusmn; 194 s. Wnioski: U pacjentów z oporną postacią dławicy piersiowej, poddanych zabiegowi PMLR, obserwuje się długoterminowe zmniejszenie poziomu dolegliwości dławicowych oraz poprawę tolerancji wysiłku. (Folia Cardiol. 2004; 11: 91&#8211;100