Myeong-Ho Yoon

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BACKGROUND Three-dimensional (3D) echocardiography has been reported to be valuable for evaluating the geometry of cardiac chambers. We validated the accuracy of 3D transthoracic echocardiography for quantifying aortic root geometry in comparison with cardiac multi-detector computed tomography (MDCT). METHODS Twenty-three patients who underwent cardiac(More)
BACKGROUND AND OBJECTIVES Recent studies indicate that in response to vasoconstrictor stimuli, the small GTPase RhoA and its down-stream effector, Rho-associated kinase 2 (ROCK)/Rho-kinase, are associated with hypercontraction of the vascular smooth muscle of coronary arteries through augmentation of myosin light chain phosphorylation and Ca(2+)(More)
BACKGROUND In a previous study, we demonstrated that the thickness of epicardial adipose tissue (EAT), measured by echocardiography, was increased in patients with metabolic syndrome (MS) and coronary artery disease (CAD). Several studies on obese patients, however, failed to demonstrate any relationship between EAT and CAD. We hypothesized that body mass(More)
BACKGROUND We sought to investigate the mechanism of geometric changes after main branch (MB) stent implantation and to identify the predictors of functionally significant "jailed" side branch (SB) lesions. METHODS AND RESULTS Seventy-seven patients with bifurcation lesions were prospectively enrolled from 8 centers. MB intravascular ultrasound was(More)
AIMS The aim of this study is to evaluate the usefulness of the index of microcirculatory resistance (IMR) for predicting myocardial viability and left ventricular (LV) function recovery in acute myocardial infarction (AMI). METHODS AND RESULTS After successful primary percutaneous coronary intervention in 40 patients with anterior AMI, IMR was measured(More)
BACKGROUND AND OBJECTIVES Microvascular function is a useful predictor of left ventricular functional changes in patients with ST-segment elevation myocardial infarction (STEMI). We evaluated the usefulness of the hyperemic microvascular resistance index (hMVRI) for predicting long-term major adverse cardiovascular events (MACEs) in patients with STEMI(More)
A descriptive exploratory design was used in this study to evaluate the effects of early parent touch on the heart rates and arterial oxygen (O2) saturation levels of 36 preterm infants. The infants were between 27-33 weeks gestational age at birth, and were free of congenital defects. Infants were videotaped during parent visits on up to three separate(More)
Carbon monoxide (CO) intoxication could cause significant cardiac injury. Although cardiac dysfunction after CO intoxication can be presented, the echocardiographic findings after CO intoxication are poorly defined. The purpose of this study was to evaluate the clinical patterns of left ventricular (LV) systolic dysfunction using echocardiography. A total(More)
BACKGROUND Arterial stiffening may affect regional myocardial function in hypertensive patients with normal ejection fraction (EF). METHODS Brachial-ankle pulse wave velocity (PWV) was measured in 70 patients, of mean age 48 ± 14 years, with untreated hypertension and EF > 55%. Using two-dimensional-speckle tracking echocardiography, we measured(More)