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- 저자 : Balbir Singh (검색결과 6 건)
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Variants of compatible mappings in fuzzy metric spaces
Pawan Kumar,Balbir Singh,Z. K. Ansari 원광대학교 기초자연과학연구소 2018 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.15 No.2
In this paper, we introduce the notions of compatible mappings of type(R), type (K) and type (E) in Fuzzy metric spaces and prove some common fixed point theorems for these mappings.In fact, we call these maps as variants of compatible mappings.
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신은석,허애영,안소희,Gillian Balbir Singh,김용훈,Takayuki Okamura,Scot Garg,구본권 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.3
Purpose: The effects on the side-branch (SB) ostium, following paclitaxel-coated balloon (PCB) treatment of de novo coronary lesionsof main vessels have not been previously investigated. This study was aimed at evaluating the serial morphological changes of the SB ostium after PCB treatment of de novo coronary lesions of main vessels using optical coherence tomography (OCT). Materials and Methods: This prospective, single-center observational study enrolled patients with de novo lesions, which were traversed by at least one SB (≥1.5 mm) and were treated with PCB. The SB ostium was evaluated with serial angiographic and OCT assessments pre- and post-procedure, and at 9-months follow-up. Results: Sixteen main vessel lesions were successfully treated with PCB, and 26 SBs were included for analysis. Mean SB ostial lumenarea increased at 9-months follow-up (0.92±0.68 mm2 pre-procedure, 1.03±0.77 mm2 post-procedure and 1.42±1.18 mm2 at 9-months). The SB ostial lumen area gain was 0.02±0.24 mm2 between pre- and post-procedure, 0.37±0.64 mm2 between post-procedure and 9-months, and 0.60±0.93 mm2 between pre-procedure and 9-months. The ostial lumen area increased by 3.9% [interquartile range (IQR) of -33.3 to 10.4%] between pre- and post-procedure, 52.1% (IQR of -0.7 to 77.3%) between post-procedureand 9-months and 76.1% (IQR of 18.2 to 86.6%) between pre-procedure and 9-months. Conclusion: PCB treatment of de novo coronary lesions of main vessels resulted in an increase in the SB ostial lumen area at 9-months.
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신은석,허애영,안소희,Gillian Balbir Singh,김용훈,구본권 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.1
Purpose: When performing coronary angiography (CAG), diagnostic catheter intubation to the ostium can cause damping of thepressure tracing. The aim of this study was to determine the predictors of atherosclerotic ostial stenosis in patients showing pressuredamping during CAG. Materials and Methods: In total, 2926 patients who underwent diagnostic CAG were screened in this study. Pressure dampingwas defined as an abrupt decline of the coronary blood pressure with a blunted pulse pressure after engagement of the diagnosticcatheter. According to CAG and intravascular ultrasound (IVUS), we divided damped ostia into two groups: atherosclerotic ostiallesion group (true lesion group) and non-atherosclerotic ostium group (false lesion group). Clinical and angiographic characteristicswere compared between the two groups. Results: The overall incidence of pressure damping was 2.3% (68 patients and 76 ostia). Among the pressure damped ostia, 40.8%(31 of 76 ostia) were true atherosclerotic ostial lesions (true lesion group). The true lesion group had more frequent left main ostialdamping and more percutaneous coronary interventions (PCIs) performed on non-ostial lesions, compared to the false lesiongroup. On multivariate logistic regression analysis, left main ostial damping [hazard ratio (HR) 4.11, 95% confidence interval (CI)1.24–13.67, p=0.021] and PCI on non-ostial lesion (HR 5.34, 95% CI 1.34–21.27, p=0.018) emerged as independent predictors fortrue atherosclerotic ostial lesions in patients with pressure damping. Conclusion: Left main ostial damping and the presence of a non-ostial atherosclerotic lesion may suggest a significant true atheroscleroticlesion in the coronary ostium.
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신은석,허애영,안소희,Gillian Balbir Singh,김용훈,유상용,Scot Garg,구본권 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.2
Purpose: This study compared the angiographic outcomes of paclitaxel-coated balloon (PCB) versus plain old balloon angioplasty(POBA) treatment for de novo coronary artery lesions. At present, there is no available data comparing the efficacy of PCB versus POBA for the treatment of de novo coronary lesions. Materials and Methods: This multicenter retrospective observational study enrolled patients with de novo coronary lesions with a reference vessel diameter between 2.5 mm and 3.0 mm and lesion length ≤24 mm who were successfully treated with PCB or POBA. Angiographic measurements and quantitative coronary analysis were performed before and after the procedure, and at 9 months follow-up. Results: A total of 72 patients (49 receiving PCB and 23 receiving POBA) were enrolled in this study. Late luminal loss was-0.12±0.30 mm in the PCB group and 0.25±0.50 mm in the POBA group (p<0.001). There was a higher percentage of binary restenosis(diameter stenosis ≥50%) in POBA, compared to PCB (30.4%, n=7 vs. 4.1%, n=2, p<0.001). Target vessel revascularization was higher in the POBA group (13.0%, n=3 vs. 0%, p=0.033). Conclusion: PCB treatment of de novo coronary lesions showed better 9-month angiographic outcomes than POBA treatment alone.
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허애영,신은석,조경임,Gillian Balbir Singh,Scot Garg,김용훈,구본권 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.1
Purpose: This study compared the impact of paclitaxel-coated balloons (PCB) or drug eluting stents (DES) on peri-procedural myocardial infarction (PMI) on de novo coronary lesion in stable patients. Materials and Methods: In this observational study, we compared the incidence of PMI amongst patients with single vessel de novo coronary lesions who underwent treatment with a PCB or DES. Propensity score-matching analysis was used to assemble a cohort of patients with similar baseline characteristics. PMI was classified as myocardial infarction occurring within 48 hours afterpercutaneous coronary intervention with a threshold of 5 x the 99th percentile upper reference limit of normal for creatine kinase-myocardial band (CK-MB) or troponin T (TnT). Results: One hundred four patients (52 receiving PCB and 52 receiving DES) were enrolled in this study. The peak mean values of CK-MB and TnT were significantly higher in the DES group. There was a significantly higher rate of PMI in the DES group (23.1% vs. 1.9%, p=0.002). Total occlusion of the side-branch occurred in two patients treated with DES, while no patients treated with PCB. In multivariable analysis, DES was the only independent predictor of PMI compared with PCB (odds ratio 42.85, 95% confidenceinterval: 3.44–533.87, p=0.004). Conclusion: Treatment with a PCB on de novo coronary lesion might be associated with a significant reduction in the risk of PMI compared to DES.
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FIXED POINT THEOREMS IN MENGER SPACE USING THE NOTION OF CLR AND JCLR PROPERTY
Z. K. ANSARI,PAWAN KUMAR,BALBIR SINGH 장전수학회 2021 Proceedings of the Jangjeon mathematical society Vol.24 No.4
Employing the common property (E.A), we prove some common xed point theorems for weakly compatible mappings in Menger space using the notion of CLR and JCLR property. Some results on simi- lar lines satisfying quasi contraction condition. Our results substantially further generalization the corresponding theorems contained in (Imdad et al. [8]).
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