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Featured researches published by Ji Yong Choi.


Korean Circulation Journal | 2010

Reference Values for the Augmentation Index and Pulse Pressure in Apparently Healthy Korean Subjects

Jin-Wook Chung; Young Soo Lee; Jeong Hyun Kim; Myung Jun Seong; So Yeon Kim; Jin Bae Lee; Jae Kean Ryu; Ji Yong Choi; Kee Sik Kim; Sung Gug Chang; Geon Ho Lee; Sung Hi Kim

Background and Objectives Arterial stiffness is a precursor to premature cardiovascular disease. The augmentation index (AI) and pulse pressure (PP) are cardiovascular risk factors. The aim of this study was to define the diagnostic values of the AI and PP from the peripheral arterial and central aortic waveforms in healthy subjects. Subjects and Methods We recruited 522 consecutive subjects (mean age 46.3±9.6 years, 290 males) who came to our facility for a comprehensive medical testing. We measured the body mass index (BMI), blood pressure, peripheral and central PP, and a pulse wave analysis that included the central and peripheral AI. Results The peripheral and central AIs in the female subjects were significantly higher than that in the male subjects (p<0.001). The peripheral and central PPs in the subjects with hyperlipidemia were significantly higher than subjects with normal lipid profiles (p<0.001). The peripheral and central PPs and peripheral and central AIs significantly increased with age. Conclusion Pending validation in prospective outcome-based studies, a peripheral PP of 70 mmHg, central PP of 50 mmHg, peripheral AI of 100%, and central AI of 40% may be preliminary values in adult subjects.


Journal of Cardiovascular Ultrasound | 2012

Anomalous Origin of the Left Coronary Artery from the Pulmonary Artery Initially Visualized by Echocardiography and Multidetector Computed Tomography Coronary Angiography

Byung Ho Kim; Yon Woong Park; Seung Pyo Hong; Ja Yung Son; Young Soo Lee; Jin Bae Lee; Jae Kean Ryu; Ji Yong Choi; Kee Sik Kim; Sung Guk Chang

Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital anomaly associated with very high mortality during infancy. We report a 35-year-old female patient with ALCAPA initially visualized by echocardiography. She visited outpatient department presenting with intermittent chest discomfort for 3 weeks. Transthoracic echocardiography showed left coronary artery arising from main pulmonary artery and abundant septal color flow Doppler signals. Transesophageal echocardiography clearly revealed markedly dilated and tortuous right coronary artery showing windsock appearance. Multidetector computed tomography and coronary angiography enabled visualization of anomalous left coronary artery originating from left side of main pulmonary trunk. After treadmill exercise test which showed ST-segment depression presenting inducible myocardial ischemia, patient underwent direct re-implantation of the anomalous coronary artery into the aorta without any complication.


Journal of Cardiovascular Ultrasound | 2011

Reversible Pulmonary Hypertension in Adolescent with Left Atrial Myxoma

Byong Kyu Kim; Jung Nam Cho; Hye Jin Park; Seung Pyo Hong; Ja Yung Son; Jin Bae Lee; Jae Keun Ryu; Ji Yong Choi; Sung Guk Chang; Kee Sik Kim

We report a patient of left atrial huge myxoma presenting with severe pulmonary hypertension in adolescents. A patient was a 14-year-old boy presented with sudden onset dyspnea. Transthoracic echocardiographic study revealed the presence of a nodular, 4.34 × 8.11 cm sized, mobile, hyperechoic mass in the left atrium and severe pulmonary hypertension with tricuspid insufficiency. After surgical therapy, tricuspid regurgitation and pulmonary hypertension was decreased and the patient was stabilized and had an uneventful clinical course.


Korean Circulation Journal | 2014

Usefulness of the Doppler Flow of the Ophthalmic Artery in the Evaluation of Carotid and Coronary Atherosclerosis

Seung Pyo Hong; Yon Woong Park; Chan Wook Lee; Joung Won Park; Kyung Ryun Bae; Seung Woon Jun; Young Soo Lee; Jin Bae Lee; Jae Kean Ryu; Ji Yong Choi; Sung Guk Chang; Kee Sik Kim

Background and Objectives There is little information about the relationship between the Doppler flow of the ophthalmic artery (OA) and carotid and coronary atherosclerosis. The aim of the investigation was to assess the clinical usefulness of the Doppler flow of the OA to estimate the severity of carotid and coronary atherosclerosis. Subjects and Methods The study was a retrospective analysis of the findings in 140 patients (mean age: 60 years, male: 64%) who underwent coronary angiography (CA) for the evaluation of typical angina between July 2010 and October 2011 in our single center. The severity of coronary artery stenosis was based on the Gensini score (GS). Significant coronary artery disease (CAD) was defined as the obstruction of over 75% of the major coronary arteries confirmed with CA. The pulsed Doppler flow of the OA and carotid ultrasound were performed before CA. Results The mean systolic velocity/mean diastolic velocity (MSV/MDV), pulsatile index and resistance index in the Doppler flow of the OA were identified as significant and independent correlations with carotid intima-media thickness, and MSV/MDV was identified to have a significant and independent correlation with the GS. MSV/MDV >2.1 was the independent predictor for significant CAD {odds ratio (OR) 3.8, 95% confidence interval (CI) 1.5-9.7, p=0.005} and carotid plaque (OR 2.8, 95% CI 1.1-7.0, p=0.028), after adjustment for CAD-associated factors. Conclusion The Doppler flow of the OA might be a useful predictor of the severity of carotid and coronary atherosclerosis.


Journal of Cardiovascular Ultrasound | 2013

Free Floating Left Atrial Thrombus Disappearing during Echocardiography

Seung Pyo Hong; Ji Yong Choi; Kee Sik Kim

An 82-year-old woman with a history of previous cerebral infarction and atrial fibrillation was hospitalized with aphagia. Brain magnetic resonance imaging showed a dot-like high signal intensity in the left occipital subcortex. With a working diagnosis of acute cerebral infarction due to cardiac emboli, trans-thoracic echocardiography (TTE) was performed. The TTE showed an oval shaped, mobile thrombus, approximately 1.9 × 1.5 cm in size within the left atrial appendage. For further evaluation of mobile thrombus in the left atrial appendage, a trans-esophageal echocardiography (TEE) was done. The TEE showed an oval shaped, mobile thrombus in the left atrial appendage (Fig. 1A). Subsequently, during follow-up TTE, the thrombus was found to be freely floating in the left atrial cavity during each cardiac cycle (Fig. 1B-F and Supplementary movie 1). After a number of cardiac cycles, the thrombus suddenly disappeared in TTE. The patients overall clinical condition and neurologic examination continued to appear stable for the entirety of echocardiographic examination. Fig. 1 Trans-esophageal echocardiography showed a free floating thrombus in the left atrial appendage (A). Trans-thoracic echocardiography (TTE) showed free floating thrombus in the left atrial appendage (B). TTE showed the thrombus moving from left atrial appendage ... After one day, the patient complained claudication in the lower right limb. In physical examination, the patients femoral pulses were not present to prompt a pulse exam. We performed a 3-dimensional (3D) femoral computer tomography (CT) to evaluate for occlusion. The 3D femoral CT showed a new filling defect in the right femoral artery in comparison with an abdominal enhanced CT performed for evaluation of fever 2 days ago (Fig. 2). Following the examination, the patient was placed on warfarin for anticoagulation therapy. The patient was discharged from the hospital with an uneventful recovery and has been doing well without additional embolic events after discharge and maintenance anticoagulation therapy. Fig. 2 Abdominal enhanced computer tomography (CT) for evaluation of fever did not show a filling defect in the right femoral artery in axial plane 2 days ago (A and C). 3-dimensional (3D) femoral CT showed a filling defect (arrow) in the right femoral artery ... Left atrial free floating thrombus is infrequent but predominantly associated with mitral valve disease, atrial fibrillation, as in our case, and hypertrophic cardiomyopathy.1-4) The presence of left atrial free floating thrombus is linked to higher embolic rates and the most common presentation of left atrial thrombus is, as in our case, peripheral embolization.5) This case is an interesting case of free-floating left atrial thrombus disappearing during echocardiography.


International Journal of Cardiology | 2007

Coronary artery stenting in a patient with angina pectoris caused by coronary artery dissection after blunt chest trauma.

Jae Kean Ryu; Kee Sik Kim; Jin Bae Lee; Ji Yong Choi; Sung Gug Chang; Sungmin Ko


Journal of the American College of Cardiology | 2015

TCT-476 Clinical outcomes of unprotected left main coronary artery disease in Korean single center

Seung Pyo Hong; Byong Kyu Kim; Yon-Woong Park; Jin Bae Lee; Jae Kean Ryu; Ji Yong Choi; Kee Sik Kim


Journal of the American College of Cardiology | 2015

NATURAL COURSE OF INTERMEDIATE STENOSIS IN COMPUTED TOMOGRAPHY CORONARY ANGIOGRAPHY

Seung Pyo Hong; Chan Wook Lee; Ji Hyun Son; Young Soo Lee; Jin Bae Lee; Jae Kean Ryu; Ji Yong Choi; Kee Sik Kim


Journal of the American College of Cardiology | 2013

TCT-663 Coronary Computed Tomography Angiography Overestimate Coronary Lumen Dimension than Intravascular Ultrasound Especially Small Lumen Measurement

Jin Bae Lee; Kyung-Ryun Bae; Sung Gug Chang; Ji Yong Choi; Seung Pyo Hong; Seung-woon Jun; Kee Sik Kim; Jung Hyun Kim; Young Soo Lee; Jae Kean Ryu; Myung Jun Seong


Journal of the American College of Cardiology | 2013

TCT-264 The Systolic Function Was Improved But Diastolic Function Was Not Improved After STEMI Treated With Primary PCI

Jin Bae Lee; Kyung-Ryun Bae; Sung Gug Chang; Ji Yong Choi; Seung Pyo Hong; Seung-woon Jun; Kee Sik Kim; Young Soo Lee; Jae Kean Ryu

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Kee Sik Kim

The Catholic University of America

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Jin Bae Lee

The Catholic University of America

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Jae Kean Ryu

The Catholic University of America

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Young Soo Lee

Catholic University of Daegu

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Seung Pyo Hong

The Catholic University of America

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Sung Gug Chang

The Catholic University of America

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So Yeon Kim

The Catholic University of America

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Myung Jun Seong

The Catholic University of America

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Sung Guk Chang

The Catholic University of America

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Byong Kyu Kim

The Catholic University of America

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