정재승 교수

Nanoporous AAO (Anodic Aluminum Oxide) membranes have many advantages as a template for variety of magnetic materials. Materials can be embedded into the pores by electrodeposition, sputtering or magnetic-field-assisted infiltration of magnetic nanoparticles. This work focuses on the fabrication of the magnetic structures in the AAO templates by electrodeposition. Our method allows the controlled growth of Co nanostructures within the porous alumina membrane in the form of dots, rods and long wi

How much flow is required by a nonpulsatile pump to match the coronary blood flow equivalent to that of pulsatile pump? A cardiopulmonary bypass circuit from the right atrium to the ascending aorta was constructed in a ventricular fibrillation model using 13 Yorkshire swine. The animals were randomly divided into two groups: CONTROL (pulsatile T-PLS, n = 7) or EXPERIMENTAL (nonpulsatile Biopump, n = 6). The hemodynamic data at mid-LAD level was measured with a flow meter at baseline and every 20

BACKGROUND: We examined the relationship between blood transfusion and long-term adverse events to evaluate the clinical impact of red blood cell (RBC) transfusion on patients undergoing cardiac valve surgery. METHODS: From the National Health Insurance Service database, individuals undergoing heart valve surgery were verified, including aortic valve (AV), mitral valve (MV), tricuspid valve (TV), and complex valves (more than 2 valve surgeries). The interested outcomes were incidence of death, i

AIM: The present study was aimed to compare the hemodynamic flow characteristics of LIMA radial artery composite sequential bypass grafting and with single LIMA and saphenous vein sequential bypass grafting performed by off-pump coronary artery bypass grafting (OPCAB). METHODS: Between March 2007 and February 2008, 121 OPCAB patients were prospectively divided into two groups; Group I (N.=70, left internal thoracic artery [LITA]-left anterior descending [LAD] and Ao-SV sequential grafting), and

Percutaneous placement of extracorporeal membrane oxygenation (ECMO) cannulas has many benefits. However, limb ischaemia still remains as an unresolved problem. We experienced an interesting case of limb ischaemia that was caused by external compression of the superficial femoral artery by the venous cannula. A 73-year old woman underwent veno-arterial ECMO due to sudden cardiac arrest with percutaneous femoral cannulations at the right common femoral vein and the left common femoral artery. Thr

Successful weaning from extracorporeal membrane oxygenation (ECMO) does not necessarily imply patient survival. We retrospectively analyzed 441 patients with acute respiratory failure from 16 hospitals in South Korea who underwent ECMO from January 2012 to December 2015. We evaluated the clinical factors associated with mortality after successful weaning from ECMO. Of all 441 patients, 245 (55.6%) were successfully weaned from ECMO. The majority of patients were initially supported with veno-ven

Extracorporeal membrane oxygenation (ECMO) was originated from heart-lung machine for cardiac surgery. This technique that receive the blood from venous system, oxygenate it and support to selected patients with severe respiratory or cardiac failure as flow and oxygen. ECMO can provide partial or total support, is temporary, and requires systemic anticoagulation. ECMO controls gas exchange and perfusion, stabilizes the patient physiologically, decreases the risk of ongoing iatrogenic injury, and

Having a permanent omniphobicity on the inner surface of the tube can bring enormous advantages, such as reducing resistance and avoiding precipitation during mass transfer. For example, such a tube can prevent blood clotting when delivering blood composed of complex hydrophilic and lipophilic compounds. However, it is very challenging to fabricate micro and nanostructures inside a tube. To overcome these, a wearability and deformation-free structural omniphobic surface is fabricated. The omniph

Vessel lumens that have been chronically narrowed by atherosclerosis should be increased in flow velocity and intrastenotic area pressure to maintain an equal flow. This might be followed by a decrease in hemodynamic energy, leading to a reduction of tissue perfusion. In this study, we compared hemodynamic energies according to degrees of stenotic vasculature between pulsatile flow and nonpulsatile flow. Cannuale with 25, 50, and 75% diameter stenosis (DS) were located at the outlet cannula. Usi

Extra hemodynamic energy is one of the major benefits of pulsatile flow, improving blood flow to vital organs. But most (80%) of the hemodynamic energy generated from pulsatile flow is damped by the extracorporeal circuit. Most models devised to minimize hemodynamic energy loss have been in vitro pediatric models. The purpose of this study was to measure hemodynamic energy in different vessels of different organs with an in vivo adult swine model. An extracorporeal circuit was constructed for se