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Lipid-Core Plaque Assessed by Near-Infrared Spectroscopy and Procedure Related Microvascular Injury
Hyoung-Mo Yang,Myeong-HoYoon,Hong-Seok Lim,Kyoung-Woo Seo,Byoung-JooChoi,So-YeonChoi,Gyo-SeungHwang,Seung-Jea Tahk 대한심장학회 2019 Korean Circulation Journal Vol.49 No.11
Background and Objectives: Microvascular damage due to distal embolization during percutaneous coronary intervention (PCI) is an important cause of periprocedural myocardial infarction. We assessed the lipid-core plaque using near-infrared spectroscopy (NIRS) and microvascular dysfunction invasively with the index of microcirculatory resistance (IMR) and evaluated their relationship. Methods: This study is pilot retrospective observational study. We analyzed 39 patients who performed NIRS before and after PCI, while fractional flow reserve, thermo-dilution coronary flow reserve (CFR) and IMR were measured after PCI. The maximum value of lipid core burden index (LCBI) for any of the 4-mm segments at the culprit lesion (culprit LCBI4mm) was calculated at the culprit lesion. We divided the patients into 2 groups using a cutoff of culprit LCBI4mm ≥500. Results: Mean pre-PCI LCBI was 333±196 and mean post-PCI IMR was 20±14 U. Post-PCI IMR was higher (15.6±7.3 vs. 42.6±17.6 U, p<0.001) and post-PCI CFR was lower (3.7±2.2 vs. 2.1±1.0, p=0.029) in the high LCBI group. Pre-PCI LCBI was positively correlated with post-PCI IMR (ρ=0.358, p=0.025) and negatively correlated with post-PCI CFR (ρ=−0.494, p=0.001). The incidence of microvascular dysfunction (IMR ≥25 U) was higher in the high LCBI group (9.4% vs. 85.7%, p<0.001). However, there were no significant differences in the incidences of creatine Kinase-MB (9.4% vs. 14.3%, p=0.563) and troponin-I elevation (12.5% vs. 14.3%, p=1.000). Conclusions: A large lipid-core plaque at the ‘culprit’ lesion is observed higher incidence of post-PCI microvascular dysfunction after PCI. Prospective study with adequate subject numbers will be needed.
Yang, Hyoung-Mo,Tahk, Seung-Jea,Woo, Seong-Ill,Lim, Hong-Seok,Choi, Byoung-Joo,Choi, So-Yeon,Yoon, Myeong-Ho,Park, Jin-Sun,Zheng, Mingri,Hwang, Gyo-Seung,Kang, Soo-Jin,Shin, Joon-Han Wiley Subscription Services, Inc., A Wiley Company 2009 Catheterization and cardiovascular interventions Vol.74 No.1
<B>Objectives:</B><P>We aimed to evaluate long-term outcomes of a modified mini-crush technique for treating bifurcation lesions.</P><B>Background:</B><P>Coronary bifurcation lesions continue to show a relatively high restenosis rate despite the use of a drug-eluting stent (DES).</P><B>Methods:</B><P>We enrolled 52 consecutive patients treated with sirolimus-eluting stent implantation using the modified mini-crush technique for 56 coronary bifurcation lesions (MEDINA 1, 1, 1, 89.2%; left main lesion, 28.6%). To minimize crushing, the proximal marker of the side branch (SB) stent was located in contact with the main vessel (MV) stent. After SB stenting, we drew the SB balloon proximally and dilate the SB ostium at a rated burst pressure. After MV stenting, both vessels were redilated at a high pressure before final kissing balloon (FKB) inflation. Clinical and angiographic follow-ups were performed at 9 months.</P><B>Results:</B><P>Immediate procedural success was obtained in all cases including a FKB success rate of 98%. At 9 months, there was no death or myocardial infarction. The incidences of major adverse cardiac events and target lesion revascularization were 11.8 and 7.8%, respectively. The in-stent restenosis (ISR) rate was 14.9% (SB ostium, 10.6%) and most ISRs were of the focal type and the cause of ISR was intimal hyperplasia but not chronic stent recoil by an intravascular ultrasound study. There was one case (2.0%) of late stent thrombosis without any ischemic symptoms during the follow-up period of 9 months.</P><B>Conclusions:</B><P>Modified mini-crush technique provides excellent technical and angiographic success immediately and it also provides acceptable long-term outcomes. © 2009 Wiley-Liss, Inc.</P>
Effect of cadmium toxicity to Paranura rosea at two different temperatures
Nan-Hee Yang,Jino Son,Hyoung-ho Mo,Kijong Cho 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
In Korea very few studies have been conducted in relation to collembola sensitivity to pollutants in populations exposed to soil contaminants in particular heavy metals. The objective of the current research were to study the thermal effects of selected heavy metals on the survival and reproduction of P. rosea in order to assess its applicability as a test species. Petri dishes (87 mm diameter, 15 mm height) were used for compact soil toxicity test and were filled to a depth of 0.5 mm with 6 g artificial soil and 3.5 mL distilled water was added. 20 adults (6 weeks from egg stage) were introduced to each petri dish and placed in two incubators set at 20℃ and 25℃, respectively under continuous darkness. The 28 days EC50s for cadmium in compact soil at 20℃ and 25℃ were 48.9031 and 91.3585 mg/kg, respectively. This thermal toxicity test of P. rosea is advantageous for various environmental sudies, such as toxicity tests.
Yang, Suk-Kyun,Hong, Myunghee,Zhao, Wanting,Jung, Yusun,Baek, Jiwon,Tayebi, Naeimeh,Kim, Kyung Mo,Ye, Byong Duk,Kim, Kyung-Jo,Park, Sang Hyoung,Lee, Inchul,Lee, Eun-Ju,Kim, Won Ho,Cheon, Jae Hee,Kim, BMJ Publishing Group Ltd 2014 Gut Vol.63 No.1
<P><B>Objective</B></P><P>Crohn's disease (CD) is an intractable inflammatory bowel disease (IBD) of unknown cause. Recent meta-analysis of the genome-wide association studies (GWAS) and Immunochip data identified 163 susceptibility loci to IBD in Caucasians, however there are limited studies in other populations.</P><P><B>Methods</B></P><P>We performed a GWAS and two validation studies in the Korean population comprising a total of 2311 patients with CD and 2442 controls.</P><P><B>Results</B></P><P>We confirmed four previously reported loci: <I>TNFSF15</I>, <I>IL23R</I>, the major histocompatibility complex region, and the <I>RNASET2-FGFR1OP-CCR6</I> region. We identified three new susceptibility loci at genome-wide significance: rs6856616 at 4p14 (OR=1.43, combined p=3.60×10<SUP>−14</SUP>), rs11195128 at 10q25 (OR=1.42, combined p=1.55×10<SUP>−10</SUP>) and rs11235667 at 11q13 (OR=1.46, combined p=7.15×10<SUP>−9</SUP>), implicating <I>ATG16L2</I> and/or <I>FCHSD2</I> as novel susceptibility genes for CD. Further analysis of the 11q13 locus revealed a non-synonymous single nucleotide polymorphism (SNP) (R220W/rs11235604) in the evolutionarily conserved region of <I>ATG16L2</I> with stronger association (OR=1.61, combined p=2.44×10<SUP>−12</SUP>) than rs11235667, suggesting <I>ATG16L2</I> as a novel susceptibility gene for CD and rs11235604 to be a potential causal variant of the association. Two of the three SNPs (rs6856616 (p=0.00024) and rs11195128 (p=5.32×10<SUP>−5</SUP>)) showed consistent patterns of association in the International IBD Genetics Consortium dataset. Together, the novel and replicated loci accounted for 5.31% of the total genetic variance for CD risk in Koreans.</P><P><B>Conclusions</B></P><P>Our study provides new biological insight to CD and supports the complementary value of genetic studies in different populations.</P>
Al-1 wt % Mg 합금의 일방향응고시 고/액 계면의 형상에 미치는 강화중력의 영향
양영기,강춘식,이진형,이경환,백홍구,윤우영,황장모 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.3
Al-1wt%Mg was unidirectionally solidified to investigate the effect of enhanced gravity on the planar interface morphology. Planar solid/liquid interface morphology became unstable with increasing centrifugal force up to 15G but stabilized again at 20G. Surface stabilization of this alloy with increasing centrifugal force can be explained by thermosolutal convection.
Al-0.7wt%Cu 합금의 일방향응고시 평활계면형태에 미치는 원심력의 영향
양영기,강춘식,이진형,이경환,백홍구,황창모,윤우영 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.8
To clarify the effect of centrifugal force in unidirectionally solidified metals, Al-0.7wt% Cu alloy system was selected as test material. Centrifugal force was added from 1G(G: territorial acceleration=9.8m/s²) to 20G ; test pieces were quenched at about 50% solid fraction. Planar interface morphology became unstable with increasing centrifugal force, but at the centrifugal force is about 15G, the interface morphology of this alloy became stable again. In order to understand this interface stability under the high centrifugal force apparent diffusion coefficient were measured and also flow modes over solid-liquid interface were analyzed by Favier Method. The Be´rnard cell formed by centrifugal force enhances the heat flow from top of test piece to solid-liquid interface but it and gravitational segregation also restrict enhancement of diffusion in some extant. We could infer qualitatively that solid-liquid interface stability was due to this enhancement of heat flux by centrifugal force at solid-liquid interface.