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- Appelfeller, Stephan, et al.
(författare)
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Continuous crossover from two-dimensional to one-dimensional electronic properties for metallic silicide nanowires
- 2020
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Ingår i: Physical Review B. - 2469-9950. ; 102:11
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Tidskriftsartikel (refereegranskat)abstract
- In a joint experimental and theoretical study on metallic TbSi2 nanowires, we observe a continuous crossover from a two-dimensional (2D) to a quasi-one-dimensional (1D) electronic structure by reduction of the nanowire width. The nanowires were grown by self-organization on vicinal Si(111) substrates denoted by the Miller indices (hhk). Their electronic structure was analyzed by angle-resolved photoemission spectroscopy (ARPES) and calculated using density functional theory (DFT). In ARPES, the TbSi2 nanowires show basically the 2D electronic structure of the TbSi2 film on planar Si(111) with an increasing momentum broadening for decreasing nanowire widths, consistent with Heisenberg's uncertainty principle. In contrast, DFT calculations predict a purely 1D electronic structure for TbSi2 nanowires. Unfolding this 1D electronic structure onto the Brillouin zone of the TbSi2 film leads to a Fermi surface appearing similar to the one of the 2D TbSi2 film, but with an additional 1D contribution from nanowire edges. Such an additional 1D signature is also observed in ARPES for narrow nanowires. These results indicate a continuous transition to a 1D electronic structure for decreasing nanowire widths.
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- Baranowski, Jacek, et al.
(författare)
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Echo-guided presentation of the aortic valve minimises contrast exposure in transcatheter valve recipients
- 2011
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Ingår i: Catheterization and cardiovascular interventions. - : Wiley. - 1522-1946 .- 1522-726X. ; 77:2, s. 272-275
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: We have developed a method using transthoracic echocardiography in establishing optimal visualization of the aortic root, to reduce the amount of contrast medium used in each patient. BACKGROUND: During transcatheter aortic valve implantation, it is necessary to obtain an optimal fluoroscopic projection for deployment of the valve showing the aortic ostium with the three cusps aligned in the beam direction. This may require repeat aortic root angiograms at this stage of the procedure with a high amount of contrast medium with a risk of detrimental influence on renal function. METHODS: We studied the conventional way and an echo guided way to optimize visualisation of the aortic root. Echocardiography was used initially allowing easier alignment of the image intensifier with the transducer's direction. RESULTS: Contrast volumes, radiation/fluoroscopy exposure times, and postoperative creatinine levels were significantly less in patients having the echo-guided orientation of the optimal fluoroscopic angles compared with patients treated with the conventional approach. CONCLUSION: We present a user-friendly echo-guided method to facilitate fluoroscopy adjustment during transcatheter aortic valve implantation. In our series, the amounts of contrast medium and radiation have been significantly reduced, with a concomitant reduction in detrimental effects on renal function in the early postoperative phase.
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- Engerström, Lars, et al.
(författare)
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Mortality Prediction After Cardiac Surgery: Higgins’ Intensive Care Unit Admission Score Revisited
- 2020
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Ingår i: Annals of Thoracic Surgery. - : Elsevier BV. - 0003-4975 .- 1552-6259. ; 110:5, s. 1589-1594
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Tidskriftsartikel (refereegranskat)abstract
- Background: This study was performed to develop and validate a cardiac surgical intensive care risk adjustment model for mixed cardiac surgery based on a few preoperative laboratory tests, extracorporeal circulation time, and measurements at arrival to the intensive care unit. Methods: This was a retrospective study of admissions to 5 cardiac surgical intensive care units in Sweden that submitted data to the Swedish Intensive Care Registry. Admissions from 2008 to 2014 (n = 21,450) were used for model development, whereas admissions from 2015 to 2016 (n = 6463) were used for validation. Models were built using logistic regression with transformation of raw values or categorization into groups. Results: The final model showed good performance, with an area under the receiver operating characteristics curve of 0.86 (95% confidence interval, 0.83-0.89), a Cox calibration intercept of –0.16 (95% confidence interval, –0.47 to 0.19), and a slope of 1.01 (95% confidence interval, 0.89-1.13) in the validation cohort. Conclusions: Eleven variables available on admission to the intensive care unit can be used to predict 30-day mortality after cardiac surgery. The model performance was better than those of general intensive care risk adjustment models used in cardiac surgical intensive care and also avoided the subjective assessment of the cause of admission. The standardized mortality ratio improves over time in Swedish cardiac surgical intensive care. © 2020
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- Friberg, Örjan, et al.
(författare)
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Carath -ett verksamhetsinitierat kvalitetsregister och processtöd : Ger toraxkirurgin bra möjlighet att följa vårdprocessen
- 2011
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Ingår i: Läkartidningen. - Stockholm : Sveriges läkarförbund. - 0023-7205 .- 1652-7518. ; 108:26-28, s. 1365-1369
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Tidskriftsartikel (refereegranskat)abstract
- Vi redovisar här våra mångåriga erfarenheter av uppbyggnaden och implementeringen av ett IT-processtöd (Carath) för specialiserad vård, i detta fall toraxkirurgi. Kombinerade kvalitets- och processdata ur Carath har givit en unik möjlighet att följa för vårdprocessen relevanta nyckeltal. Sjukvårdsprocesser är komplexa. Bristande detaljkunskap om dessa eller underskattning av tidsåtgång för planering leder till fel i databasen, vilka kan vara svåra att korrigera i efterhand. Avsevärda resurser bör avsättas för att säkerställa en god validitet på data i ett kvalitetsregister. Komplexiteten i att koppla ihop t ex kvalitetsregister och datajournal med varandra på ett tillförlitligt vis ska inte underskattas.
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