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Isolated Gastric Varix Bleeding Caused by Splenic Vein Obstruction: Two Case Reports
Juyoung Pak,Sangjoon Lee,Hyoung Nam Lee,Dongho Hyun,Sung-Joon Park,Youngjong Cho 대한영상의학회 2023 대한영상의학회지 Vol.84 No.1
Isolated left-sided portal hypertension is a rare clinical syndrome caused by splenic veno-occlusive disease. Splenic vein thrombosis and extrinsic compression causes proximal splenic vein hypertension, and the splenic blood flows into the superior mesenteric or portal vein through the upper stomach’s collateral vessels, such as the short gastric, coronary, and gastroepiploic veins. Open splenectomy is recommended to treat gastrointestinal bleeding caused by isolated left-sided portal hypertension. Interventional management could be a clinically useful option for selected patients who want to avoid surgical corrections. The report presents two cases of left-sided portal hypertension with gastric variceal bleeding.
Juyoung Pak,Hyoung Nam Lee,Myung Sub Kim,Hyerim Park 대한영상의학회 2024 대한영상의학회지 Vol.85 No.2
Primary aldosteronism is a group of disorders in which the autonomous secretion of aldosterone is associated with hypertension and hypokalemia. It is crucial to determine the laterality of aldosterone hypersecretion because treatment options differ accordingly. Adrenal venous sampling (AVS) is considered the most reliable method for assessing the laterality of primary aldosteronism. This procedure is often technically challenging because of the small size and varied locations of the adrenal veins. A better understanding of anatomical variations and careful review of imaging studies would improve sampling success. This report presents three cases of anatomical variations encountered during AVS.
Ratiometric Two-Photon Fluorescent Probe for Detecting and Imaging Hypochlorite
Pak, Yen Leng,Park, Sang Jun,Xu, Qingling,Kim, Hwan Myung,Yoon, Juyoung American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.15
<P>The ratiometric fluorescent probe <B>B6S</B>, which contains pyrene as a fluorophore and imidazoline-2-thione as a reactive site, was developed for detection of hypochlorite (OCl<SUP>-</SUP>). <B>B6S</B> displays a high specificity toward OCl<SUP>-</SUP> in contrast to other reactive oxygen species and reactive nitrogen species. The probe has a low detection limit and operates under biological conditions. Moreover, the low cytotoxicity of <B>B6S</B> enables it to be utilized effectively for OCl<SUP>-</SUP> imaging in living cells and tissues by using two-photon microscopy. The findings indicate that <B>B6S</B> has the capability of serving as a probe to explore the biological functions of OCl<SUP>-</SUP> in living systems.</P> [FIG OMISSION]</BR>
Pak, Yen Leng,Park, Sang Jun,Song, Gyeongok,Yim, Yubin,Kang, Hyuk,Kim, Hwan Myung,Bouffard, Jean,Yoon, Juyoung American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.21
<P>The naphthoimidazolium borane <B>4</B> is shown to be a selective probe for HOCl over other reactive oxygen species. Unlike other boronate-reactive oxygen species (ROS) fluorogenic probes that are oxidized by HOCl through a nucleophilic borono-Dakin oxidation mechanism, probe <B>4</B> is distinguished by its electrophilic oxidation mechanism involving B-H bond cleavage. Two-photon microscopy experiments in living cells and tissues with the probe <B>4</B> demonstrate the monitoring of endogenous HOCl generation and changes in HOCl concentrations generated in the endoplasmic reticulum during oxidative stress situations.</P> [FIG OMISSION]</BR>