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고종훈 關東大學校 醫科大學 醫科學硏究所 2002 關東醫大學術誌 Vol.6 No.1
The pattern of instent restenosis(ISR) have been described before as either diffuse(lesion〉10mm in length) of focal (lesion≤10mm in length). No devices have significantly improved outcomes after the treatment of diffuse ISR. Aside from lesion length, other morphological ISR patterns have not described or related to prognosis. To describe morphological ISR, we verified by using angiogram. We developed an angiographic classification of ISR according to the geographic distribution of intimal hyperplasia in reference to the implanted stent. Class Ⅰ focal lesion ISR(10mm in length, class Ⅱ is diffuse instent lesion, ISR) 10mm within the stent, class Ⅲ is diffuse proliferative lesion, includes ISR lesion〉10mm extending outside the stent, and class Ⅳ is total occlusion, totally occuded ISR. We classified of 44 IRS lesionos. Pattern I was found in 16(61%), pattern Ⅱ in 11(25%), pattern Ⅲ in 14(31%)and pattern Ⅳ in 3(6%). Ballooning angioplasty with or without brachytherapy were used predominantly in class Ⅰ or class Ⅱ whereas class Ⅲ or Ⅳ were treated with rotablation with ballooning angioplastry. Final diameter stenosis were no significant among ISR pattern, despite the different revascularization stragies. Multivariate analysis showed that diabetes, the pattern of ISR class. The introduced angiogrphic classification is prognostically important, and it may be sued of appropriate revascularization strategies.
고종훈 관동대학교 의과학연구소 2000 關東醫大學術誌 Vol.4 No.1
To predict improvement of left ventricular(LV) regional wall motion after successful coronary revascularization in acute myocardial infarction(AMI), we measured coronary flow reserve in the infarct-related artery using intracoronary Doppler guide-wire and intracoronary adenosine infusion after successful stent deployment in 43 patients with AMI ( 24 LAD,16 RCA 3 LCX), and compared them with changes in regional wall motion(RWM) and ejection fraction(EF) by two dimensional echocardiography before and at follow up after 6 months. A RWM score index(RWMI) based 16 segments model and four grading system with used to assess RWM function. RWM improvement was defined as a decrease in 2 grades in the total segmental scores at follow up. The patients were divided into two groups according to the improvement of RWM. Group A comprised 25 patients (18 man, 7women, aged 61 ±8 years) who improved RWM, group B comprised 18 patient (14 man, 4 women, aged 59±10 years) who did not improve RWM or worsen RWM.
관상동맥 조영술상 정상인 고혈압환자에서 관상동맥 혈류 예비력의 결정인자
고종훈,윤명호,최소연,탁승제 관동대학교 의과대학 의과학연구소 2005 關東醫大學術誌 Vol.9 No.1
Background ; Several studies were reported that reduction of coronary flow reserve(CFR) might lead to myocardial ischemia in the absence of epicardial coronary stenosis. In addition left ventricular hypertrophy might be associated with impairment of coronary flow reserve. The aim of the this study was to assess whether relation exists between CFR and left ventricular mass index(LVMI) and to evaluate the major determinant factors of CFR. Method ; We studied 32 inpatients with hypertension and normal coronary angiogram. Control group consised of 19 subjects(M:F=10:9, mean age 52.6±9.7), group Ⅰ included 14 subjects (LVMI is below 125mg/m2,M:F=6.8 mean age 55.3±14.6) and group Ⅱ consist of 18 subject (LVMI is exceeded 125mg/m2,M:F=5:13 mean age 55.8±9.4). We measured the left ventricular mass(LVM) by M-mode echocardiogram using Devereus and Reichek's method. Left ventricular mass index was calculated as LVM / BSA. We measured average peak velocity at baseline(B) and at adenosine induced hyperemie(H) at the proximal segment of left anteriror descending artery(LAD) using a 0.014 inch 15MHZ doppler wire, CFR was calculated as the hyperemic/baseline(H/B) average peak velocity ratio. Result : 1) There was no significant difference In heart rate, systolic blood pressure or diastolic blood pressure between the two hypertensive groups. 2) The B-APV was significantly increased in hypertensive group compared to the control group(14.4±4.7./21.7.±7.5/23.1±8.1cm/sec p<0.05). 3) CFR was significant reduced in groupⅠand groupⅡ than in the control group (3.2±0.4/2.53±0.6/2.38±0.7 p<0.05). Conclusion ; In hypertensive patients with angiographicaly normal coronary arteries, coronary flow reserve was significantly reduced than normal control group. and CFR was mainly determinant by baseline average peak velocity and not by left ventricular mass index.