http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Pulsatility Index in Different Modifications of Fontan Palliation: An Echocardiographic Assessment
Reza Shabanian,Parvin Akbari Asbagh,Abdullah Sedaghat,Minoo Dadkhah,Zahra Esmaeeli,Aliyeh Nikdoost,Manizheh Ahani,Mitra Rahimzadeh,Alireza Dehestani,Mohammad Ali Navabi 한국심초음파학회 2022 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.30 No.2
BACKGROUND: Adding pulsation to the Fontan circulation might change the fate of patients palliated by this procedure. Our aim was to compare the pulsatility index (PI) of the pulmonary artery (PA) between the various modifications of Fontan palliation. METHODS: Doppler-derived PI was measured in PA branches of a cohort of 28 patients palliated by 6 modifications of Fontan procedure. A group of normal individuals was included for comparison. RESULTS: Atriopulmonary connection (APC) group had the highest PA branches PI and statistically was close to the PI of the normal individuals (right pulmonary artery [RPA] PI of 1.58 vs. 1.63; p = 0.99 and left pulmonary artery [LPA] PI of 1.54 vs. 1.68; p = 0.46, respectively). The lowest PA branches PI was seen in the group of extracardiac total cavopulmonary connection (RPA PI of 0.62 and LPA PI of 0.65). Other 4 modifications including the extracardiac conduit with oversewn pulmonary valve, extracardiac conduit with preserved adjusted antegrade flow, extracardiac conduit from inferior vena cava onto the rudimentary right ventricle and lateral tunnel had a mean “RPA and LPA” PI of “1.19 and 1.17”, “1.16 and 1.11”, “1.13 and 1.11”, “0.82 and 0.84”, respectively. The modified Dunnett's post hoc test has shown a significant statistical decline in PI of all modifications compared to the normal individuals except for the APC group. CONCLUSIONS: Fontan palliated patients in different groups of surgical modification showed a spectrum of Doppler-derived PI with the highest amounts belong to the groups of pulsatile Fontan.
Mohammad Reza Salimpour,Kia Golmohammadi,Ahmad Sedaghat,Antonio Campo 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
The convective heat transfer for the turbulent flow of water/TiO2 nanofluid inside helically horizontal corrugated tubes is investigatedin this paper using experimental techniques. The tube boundary condition is a uniform wall temperature. The test apparatus was designedand assembled with a test section containing 93 cm copper tubes with internal and external diameters of 7.71 mm and 9.52 mm, respectively. First, the heat transfer characteristics of the distilled water turbulent flow in a plain copper tube were measured preliminarily. Second,various test runs were performed for nanofluids with two nanoparticle concentrations (0.1% and 0.5%), two corrugation depth todiameter ratios (0.0648 and 0.103), two corrugation pitch to diameter ratios (0.917 and 1.297), and two corrugation width to diameterratios (0.363 and 0.492) that were all within the range of turbulent Reynolds numbers (3000 < Re < 15000). The experimental resultsreveal that the Nusselt number augments the dual increments in corrugation depth and width and with the decrements in corrugation pitch,particularly for high Reynolds numbers. The nanoparticles have a stronger effect on the heat transfer in helically corrugated tubes withhigher corrugation depths and widths as well as lower corrugation pitches. A correlation for the Nusselt number in terms of the helicallycorrugated tubes is introduced based on the linear regression analysis of the experimental data.
The increasing trend of blood donation in Iran
Moslem Taheri Soodejani,Ali Akbar Haghdoost,Abbas Sedaghat,Mohammad Reza Baneshi,Farzaneh Zolala 대한혈액학회 2019 Blood Research Vol.54 No.4
BackgroundThis is the first study on the blood donation trend in Iran at a national level. We report different characteristics of blood donation such as demographic status, donor type, dona-tion trend, and geographical distribution of blood donation in Iran between 2003 and 2017.MethodsThis study used data registered in the donor vigilance part of the Iranian Blood Transfusion Organization. Statistical analysis was conducted using SPSS (SPSS Inc., Chicago, IL, USA) and ArcMap GIS version 10.2 software. A P-value <0.05 was considered statistically significant.ResultsBased on the study results, blood donation in Iran reached >2 million units in 2017; more-over, it is predicted that Iran will achieve >29 donations per 1,000 population in 2022. The proportion of regular and repeated donors increased from 77% in 2013 to 87% in 2017. The average blood donation rate in seven provinces was higher than the national average, and the average growth rate of their blood donation per population was positive.ConclusionThe results of the current study showed that there is a recent increasing trend toward blood donation in Iran. Furthermore, the largest share of donations is related to regular donors. The increasing proportion of regular and repeated donors has led to the improve-ment in the quality and consequently health level of donated blood.