Jae-Kwan Song

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BACKGROUND Conventional pacemaker implantation induces left ventricular (LV) dyssynchrony, which might affect the LV function. We sought to evaluate the impact of different right ventricular (RV) pacing sites on the LV dyssynchrony and performance. METHODS Comprehensive echocardiographic evaluation including the atrio-ventricular, inter- and(More)
Takotsubo cardiomyopathy (TTC) is an infrequent cardiac syndrome characterized by acute onset chest pain with apical ballooning on echocardiography. It is often triggered by severe emotional or physical stress, and in contrast to acute myocardial infarction (AMI), the regional wall motion abnormality returns to normal within days. Here, we describe a(More)
Although simple cylindrical or ellipsoidal left ventricular (LV) geometry with transverse or circumferential muscle contraction has been traditionally used to estimate LV performance, the estimated LV ejection fraction (EF) with muscle fiber shortening up to 20% is less than 50% of maximum, which is lower than the normal EF observed in routine clinical(More)
PURPOSE The Maze procedure has shown excellent efficacy in the elimination of atrial fibrillation (AF); however, little is known about the quality of functional recovery in the left atrium (LA) following successful sinus rhythm conversion by the Maze procedure. MATERIALS AND METHODS We prospectively enrolled 12 patients (aged 52.5±10.1 years, 1 female)(More)
Bicuspid aortic valve (BAV) is the most common congenital heart disease with marked heterogeneity in many aspects. Fusion patterns of the aortic cusp are quite variable with different type and severity of valvular dysfunction. Moreover, non-valvular cardiovascular abnormalities are associated with BAV. Among them, aortic aneurysm/dissection is the most(More)
BACKGROUND AND OBJECTIVES Basal septal thinning or localized aneurysmal dilatation without coronary artery disease has been described as a characteristic finding suggestive of cardiac sarcoidosis. We sought to assess the prevalence of this characteristic echocardiographic finding in patients with pacemaker (PM) or implantable cardiac defibrillator (ICD). (More)
BACKGROUND We sought to test whether patients with apical hypertrophic cardiomyopathy (APH) have different clinical features compared to those with typical asymmetric septal hypertrophy (ASH). METHODS Among 32,534 patients who underwent routine echocardiography at Asan Medical Center from January 2000 to December 2001, 305 patients (0.9%), who were(More)
BACKGROUND Left ventricle (LV) in patients with aortic stenosis (AS) faces a double hemodynamic load incorporating both valvular stenosis and reduced systemic arterial compliance (SAC). This study aimed to evaluate the impact of global LV afterload on LV hypertrophy (LVH) before and after aortic valve replacement (AVR). METHODS The study cohort included(More)
BACKGROUND Heart failure (HF) can be caused by left ventricular (LV) pump failure as well as by bradyarrhythmias. Hemodynamic differences between HF by LV pump failure and that by bradyarrhythmia have not been fully investigated. We hypothesized that HF by LV pump failure could be associated with both reduced cardiac output (CO) and increased LV filling(More)
Carbon monoxide is a nonirritant, odorless, colorless gas. Its effects are prominent in organs most sensitive to oxygen deprivation, such as the heart, brain, and kidney. Although less frequently, an association between thromboembolic events and carbon monoxide poisoning has been shown in the literatures. In this case, we report a case of atrial thrombus(More)