Clinical and echocardiographic changes in patients with mitral stenosis according to different therapeutic modalities / 대한내과학회지

BACKGROUND: Although rheumatic mitral stenosis is still a prevalent and clinically significant valvular heart disease in Korea, the natural history of rheumatic mitral stenosis has not been clearly determined yet. The present study aimed to evaluate the clinical and echocardiographic changes in patients with rheumatic mitral stenosis according to different therapeutic modalities. METHODS: A total of 91 patients (66 women; mean age, 50.9+/-12 years) with dominant rheumatic mitral stenosis and mitral valve area of less than 1.5 cm2 who were followed for more than 3 years (mean: 5.1 years) were included in this study. The subjects were divided into 3 groups according to the therapeutic modalities for mitral stenosis (A: medical therapy (n=31), B: percutaneous mitral valvuloplasty (n=30), C: mitral valve replacement (n=30)). Clinical and echocardiographic follow-up was performed before and immediately after therapeutic intervention such as percutaneous mitral valvuloplasty (PMV) and mitral valve replacement (MVR) and every year thereafter. Clinical symptoms and echocardiographic findings were compared between 3 groups. RESULTS: The patients of group B consisted of less females and more younger (p=NS). Clinical symptom of dyspnea was more severe in group B and C initially (A: 1.8+/-0.8, B: 2.5+/-0.8, C: 2.9+/-0.7; A vs. B, A vs. C, p<0.05) but more improved in group B and C (A: 1.6+/-0.5, B: 1.3+/-1.0, C: 1.6+/-0.5; A vs B, A vs. C, p<0.05) during the follow-up. The prevalence of atrial fibrillation did not change significantly during follow-up. Mitral valve area decreased significantly in A group from 1.1+/-0.4 to 0.9+/-0.3 cm2 (p<0.05), but, no significant change was observed in group B and C. No significant changes were observed in the left ventricular end-diastolic, end-systolic dimensions, and ejection fraction during the follow-up period. No clinically significant aggravations of associated valvular regurgitations and systolic pulmonary artery pressure were observed. CONCLUSION: In patients with mitral stenosis more than moderate severity, PMV or MVR is superior to medical therapy for controlling clinical symptoms and maintaining the mitral valve area. Therapeutic modality does not influence the change in the dimension and systolic function of the left ventricle. Accompanied other valvular regurgitation does not change significantly regardless of therapeutic modality, indicating that any additional therapy for associated valvular regurgitation is unnecessary.

The Prevalence of Simple Renal Cysts Studied by Ultrasonography, and the Relations to Age and Hypertension / 대한신장학회잡지

Simple renal cyst is the most common space- occupying lesion of kidney in adults. However, there were a few systematic Korean reports for the prevalence of simple renal cysts. Our purpose was to estimate the prevalence of simple renal cysts using ultrasonography, and to determine the relations to age and hypertension. The subjects were 504 volunteers (aged over 29 years) of the persons who were enrolled a health check-up program of Naju Hospital, Naju, Korea. Number of male in 504 persons was 334 (66.3%) and female 170 (33.7%). Mean age was 55 years (range; 30-86). The results were as follows: 1) One or more renal cysts were found in 50 individuals of 504 persons aged over 29 years (9.9%). In 331 persons aged over 49 years, the prevalence of simple renal cysts was 12.1%. The prevalence was significantly increased with age (P<0.001), but the difference between male (9.6%) and female (10.6%) was insignificant. 2) Mean value of cyst diameter was 23mm (5-69 mm) and was not correlated with age. However, the cyst diameter was significantly higher in female than in male, 32.4mm vs 18.0mm (P<0.001). Total number of cysts per person tended to increase with age (P<0.001). 3) The correlation between prevalence of simple renal cysts and blood pressure was statistically insignificant. However, the prevalence of hypertension in persons with cysts was higher than in persons with no cyst (27.9% vs 15.3%, P<0.05). Cyst diameter was not correlated with blood pressure. 4)Urinalysis in persons with cysts, showed microscopic hematuria in 47.4% and proteinuria in 26.3 %, however, grade of microscopic hematuria and proteinuria were not correlated with cyst diameter. The concentrations of blood urea nitrogen, serum creatinine, hemoglobin and hematocrit were not affected by presence or absence of simple renal cysts. By comparison with the recent foreign reports, the prevalence of simple renal cysts in Korean was similar to those in foreigners. Our study ascertained that simple renal cysts are age-dependent and total number of cysts per person also increases with age. In most of persons with simple renal cysts, the renal function is not affected and the related symptoms are trivial. However, we suggested that simple renal cysts may cause hypertension. To elucidate the correlation between simple renal cyst and hypertension, further studies are needed.

Value of Exercise Treadmill Score for Precdicting the Severity of Coronary Artery Disease / 대한내과학회지

OBJECTIVES: The treadmill exercise eletrocardiography(ECG) is the most commonly used non-invasive method in the evaluation of patients with chest pain. But the accuracy of treadmill exercise ECG in detecting the coronary artery disease(CAD) is still controversial. To improve the accuracy of the treadmill exercise test, exercise treadmill score(ETS) based on exercise duration, degree of ST deviation, and treadmill anginal index during treadmill exercise ECG has been used. METHODS: The authors calculated ETS by simple equation(total exercise duration-5 X maximal ST-segment deviation during or after exercise-4 X treadmill angina index) and analyzed coronary angiograms of 173 patients(mean age '55.5 +/- 8.7, male: female=2.7: 1) who underwent treadmill exercise ECG and coronary angiography in Chonnam University Hospital from January, 1990 through March, 1993. RESULTS: 1) The studied subjects were subdivided into 3groups according to ETS. Group A(high risk, ETSETS>or=11) 71cases(mean age 60.2 +/- 7.4, male: female=3.3:1), group C(low risk, ETS>5) 87cases(mean age 54.8 +/- 9.2, male-female =2.5:1). Clinical diagnoses of the studiedsubjects were 63stable angina, 61unstable angina, 3acute myocardial infarction, and 46 old myocardial infarction. On coronary angiographic findings, 61patients had single vessel disesase, 23patients had two vessel disease and 13patients had three vessel disease. 2) The sensitivity of the treadmill exercise ECG in diagnosing coronary artery disease was 88% and the specificity was 46%. 3) One hundred percent of group A patients had CAD and 54% of them had multivessel disease, 75% of group B had CAD and 27% of them had multivessel disease, and 33% of group C had CAD and 10% of them had multivessel disease. 4) There were no significant differences in the siite of stenotic lesion and degree of stenosis according to ETS in the patients with single vessel disease. 5) There were no significant differences in left ventricular ejection fraction and left ventricular end-diastolic pressure among three groups. CONCLUSION: Exercise treadmill score is useful in predicting the presence and severity of CAD and that low ETS less than -11 may be an indicator of multivessel coronary disease.

Clinical and Echocardiographic Features of Mid-ventricualr Obstruction of the Left Ventricle

BACKGROUND: Mid-ventricular obstruction(MVO) of the left ventricle has been reported to be associated with mid-ventricular hypertrophy, papillary muscle hypertrophy, severe apical hypertrophy, elderly hypertension, and dobutamine stress echocardiography(DSE). The aim of this study is to determine the clinical and echocardiographic features of MVO. METHOD: MVO was defined as systolic hourglass narrowing of the left mid-ventricle in the apical long axis view with turbulent flow exceeding 1m/s. Fifteen patients were suvjected to this retrospective analysis. Baseline patients characteristics were mean age 56(range, 26-74)years, male gender 10(66%). Associated diseases were hypertrophic cardiomyopathy 9, aortic stenosis 1, hypertension without left ventricular hypertrophy(LVH) 1, old myocardial infarction with apical aneurysm 2, stable angina 1, and idiopathic 1. DSE was performed in 7 of 15 subjected patients to evaluate the chest pain. RESULTS: All patients had mild symptoms; chest tightness, palpitation, and weakness, without syncope nor hypotension. MVO was observed in 10 at rest, and 5 after provocation ; DSE 3, VPB 1, atropine 1. Observed peak velocity in the mid-ventricle ranged from 1.2 to 5.5m/s(mean ; 2.8±1.6m/s). Left ventricular outflow tract obstruction defined as the peak flow velocity exceeded 1.5m/s, was also present in 8. in 7 underwent to DSE, systolic blood pressure was changed from 144±15mmHg at rest to 175±28mmHg at peak, heart rate from 73±12/min to 108±23/min, left ventricular end diastolic dimension from 42±5mm to 37±4mm, ejection fraction from 66±10% to 80±6%, and peak flow velocity at the mid-ventricle from 1.0±0.6m/s to 3.3±1.7m/s. CONCLUSION: MVO can be observed in patients without LVH and may account for clinical symptoms of chest discomfort. The mechanism of MVO, at least in part, and be explained with increased ventricular contractility, increased heart rate, and small left ventricular cavity size.

Clinical Experiences of Long-Balloon Percutaneous Transluminal Coronary Angioplasty

BACKGROUND: The lesion length of coronary artery stenosis has been regarded as a risk factor for acute complication and long segment stenosis of the coronary artery is associated with a less chance of successful percutaneous transluminal coronary angioplasty(PTCA). Many new interventional techniques auch as excimer laser angioplasty, directional atherectomy, and long-balloon angioplasty catheter have been developed and used for long lesion of coronary artery stenosis. Only a little data is, however, available on long-balloon PTCA. This study was carried out to see the clinical results of PTCA using long-balloon angioplasty catheters. SUBJECTS AND METHODS: Fifty-four coronary arterial stenotic lesions in 49 patients(M:F=32:17, 54.48.9 years)were attempted to dilate with long-balloon PTCA. Clinical diagnoses in 49 patients were acute myocardial infarction in 13, old myocardial infarction in 9, unstable angina in 18, andd stable angina in 9. Lesion length and TIMI(Thrombolysis in Myocardial Infarction) flow of target lesions were measured before PTCA. PTCA was performed in standard fashion using long-balloon angioplasty catheters. Immediate success rate, complications, and retenosis rate were evaluated. RESULTS: The associated risk factors of atherosclerosis were hypertension in 16, hypercholesterolemia in 10, smoking in 27, and diabetes mellitus in 9 patients. The target vessels were 34 left anterior descending arteries, 6 left circumflex arteries, and 14 right coronary arteries. PTCA using long-balloon catheters was performed as an adjunct to suboptimal PTCA using standard balloon catheters in 6 patients. In the remaining 44 patients, long-balloon PTCA was primarily performed due to lesion length greater than 2.0 cm. The overall success rate of long-balloon PTCA was 85.2%, and the procedure-related complications were occurred in 12(22.2%) lesions. Restenosis was revealed in 9(50%) of 18 lesions which were evaluated with follow-up coronary angiography. CONCLUSION: Above results suggest that PTCA using a long-balloon angioplasty catheter is efficacious in dilation long segment stenosis of coronary artery with a low complication rate.

A Study of Plasma Apolipoprotein A-1 and Apolipoprotein B Levels in Patients with Coronary Artery Disease

BACKGROUND: It is known that dyslipidemia plays and important role in atherogenesis and progression for the disease. Recently it was reported that apolipoprotein levels are important in athcrogenesis. In Korean patients the study of the apolipoprotein levels as for the risk factor for atherogenesis is still needed. Subjects and METHODS: The 107 patients who underwent coronary angiography to differentiate chest pain syndrome were subjected to this study. Thirty-two patients who had no significant coronary artery disease served as a control group and 75 patients who had one or more coronary stenoses more than 50% narrowing by luminal diameter served as the coronary artery disease(CAD) group. Plasma levels of total cholesterol, triglycerides, high density lipoprotein cholestero(HDL-C), apolipoprotein A-1(Apo- A1) and apolipoprotein B(Apo B) were measured from venous blood after overnight fastion, and the results were compared between the groups. RESULTS: The male gender and smoking habits were more prevalent in the CAD group. Total cholesterol levels were significantly higher in the CAD group but the HDL-C level was not significantly different in two groups though the mean level of the HDL-C was some lower in the CAD group. The Apo A-1 level was lowere in the CAD group while the Apo B level was higher in teh CAD group compared to those of the control, Apo B / Apo A-1 ratio much more distinctly discriminated the two groups. CONCLUSION: Theses results suggest that the plasma Apo-A-1, Apo B levels and the ratio of Apo B / Apo A-1 can be used for risk statification of CAD.

Clinical and Echocardiographic Changes after Short-Term Denopamine (Cardopamin(R)) Therapy in Patients with Chronic Congestive Heart Failure

BACKGROUND: Inotropic agents have been shown to improve cardiac function in patients with congestive heart failure. The purpose of the present study is to evaluate the short-term efficacy and safety of denopamine(Cardopamin(R)), and orally available beta-stimulant, in patients with chronic congestive heart failure. SUBJECTS AND METHODS: Twenty-four patients(54.1+/-10.9 years, male:female=1.4:1) with chronic congestive heart failure whose functional classes were equal or greater than New York Heart Association(NYHA) Class II were enrolled in this study after informed consents were obtained. Upon completion of baseline evaluation, denopamine(Cardopamin(R)) was administered orally, startion with 15 mg per day and increased to 30 mg per day according to the clinical response of each patient. Blood pressure, heart rate, electrocardiographic(EKG) findings, AST, BUN, and creatinine were also followed up at 4 weeks' interval. The clinical effects and side effects at 4 weeks' interbal and echocardiographic examination at baseline and 8 weeks after trentment were evaluated. RESULTS: Mean dosage of denopamine(Cardopamin(R)) was 22.9+/-5.3mg per day. The clinical symptoms of 18(75%) of 24 patients were improved. The echocardiographic follow-up revealed a significant decrease in left vetricular(LV) end-Systolic dimemsion(fron 4.8+/-0.2mm to 4.5+/-0.1mm. p<0.005) and LV end-systolic volume(from 92.0+/-8.5ml to 80.3+/-4.5ml, p<0.005). However, there was no significant interval change in LV end-diastolic dimension, LV end-diastolic volume, ejection fraction, and fractional shortening. Blood pressure, heart rate, EKG findings, AST, BUN, and creatinine were not changed significantly during treatment. CONCLUSION: Above results suggest that short-term therapy of denopamine(Cardopamin(R)) may improve clinical symptom with no side effect in patients with chronic congestive heart failure, but the long-term efficacy remains to be determined with a randomized long-term follow up study.

2 Cases of Apical Hypertrophic Cardiomyopathy with Left Ventricular Endomyocardial Calcification

Calcification of myocardium is most common in the site of an old infarction or in an aneurysmal wall. In addition, Myocardial calcification may occur in association with endomyocardial fibrosis and hyperparathyroidism, as a result of focal toxic or inflammatory myocardial necrosis, as well as in patients undergoing hemodialysis. Calcium deposits due to parasites and due to neoplastic disease may also be seen, But, left ventricular endomyocardial calcification associated with apical hypertrophic cardiomyopathy is very rare. This report describes 2 cases of apical hypertrophic cardiomyopathy with left ventricular endomyocardial calcification, diagnosed by the echocardiographic, angiographic and histologic findings.

Predictive Factors of Restenosis after Percutaneous Transluminal Coronary Angioplasty

BACKGROUND: One of major limitations of percutaneous transluminal coronary angioplasty(PTCA) is restenosis. The reliable factors predicting restenosis after successful PTCA might be important in the prevention and treatment of coronary restenosis after PTCA. METHODS: To see whether any of the clinical, angiographic. or procedural factors is likely coronary angiography due to recurrent ischemic symptoms and positive stress tests among 529 patients recived PTCA between Jul '90 and Sep '93 at the Chonnam University Hospital were analysed. RESULTS: 1) Follow-up coronary angiogram demonstrated restenosis in 67 patient(group A, 55.1+/-10.3 year, 58 male, 9 female) and no restenosis in 27 patients(group B, 55.4+/-10.3 year, 24 male, 3 female) demonstrating restenosis rate of 60.6% in this clinically suspicious group. 2) Age, sex, class and duration of angina, and clinical diagnosis were not different from each other between two groups. But the time interval from PTCA to follow-up angiogram was shorter in group A (5.3 +/-5.2 months) than in group B(9.1+/-5.6 months) and hypertension was more prevalent in group A (83.3%) than in group B(16.7%). 3) Angiographic findings such as AHA lesion types, lesion sites, TIMI flow, angulation, lesion length, branching lesion, dissection and residual stenosis were similar in two groups. But all of the eleven lesions with coronary artery calcification were found to develop restenosis. 4) As procedural factors, total ballon inflation time, the numbers of repeated inflations and maximal inflation pressure were not significantly different between two groups. CONCLUSION: Above results show that any single or combined clinical and angiographic findings except symptoms or signs suggesting myocardial ischemia, hypertension and coronary calcification could not predict the development of coronary restenosis ie the patients with shorter duration from PTCA to the clinical evidence suggestive of myocardial ischemia, hypertension and coronary calcification demonstrated by cineangiography were more likely to develop subsequent restenosis.

Predictive Factors of Restenosis after Percutaneous Transluminal Coronary Angioplasty

BACKGROUND: One of major limitations of percutaneous transluminal coronary angioplasty(PTCA) is restenosis. The reliable factors predicting restenosis after successful PTCA might be important in the prevention and treatment of coronary restenosis after PTCA. METHODS: To see whether any of the clinical, angiographic. or procedural factors is likely coronary angiography due to recurrent ischemic symptoms and positive stress tests among 529 patients recived PTCA between Jul '90 and Sep '93 at the Chonnam University Hospital were analysed. RESULTS: 1) Follow-up coronary angiogram demonstrated restenosis in 67 patient(group A, 55.1+/-10.3 year, 58 male, 9 female) and no restenosis in 27 patients(group B, 55.4+/-10.3 year, 24 male, 3 female) demonstrating restenosis rate of 60.6% in this clinically suspicious group. 2) Age, sex, class and duration of angina, and clinical diagnosis were not different from each other between two groups. But the time interval from PTCA to follow-up angiogram was shorter in group A (5.3 +/-5.2 months) than in group B(9.1+/-5.6 months) and hypertension was more prevalent in group A (83.3%) than in group B(16.7%). 3) Angiographic findings such as AHA lesion types, lesion sites, TIMI flow, angulation, lesion length, branching lesion, dissection and residual stenosis were similar in two groups. But all of the eleven lesions with coronary artery calcification were found to develop restenosis. 4) As procedural factors, total ballon inflation time, the numbers of repeated inflations and maximal inflation pressure were not significantly different between two groups. CONCLUSION: Above results show that any single or combined clinical and angiographic findings except symptoms or signs suggesting myocardial ischemia, hypertension and coronary calcification could not predict the development of coronary restenosis ie the patients with shorter duration from PTCA to the clinical evidence suggestive of myocardial ischemia, hypertension and coronary calcification demonstrated by cineangiography were more likely to develop subsequent restenosis.

Left Ventricular Function in Patients with Angina and Normal Coronary Angiogram

BACKGROUND: Angina with normal coronary angiogram has been called syndrome X or microvascular angina, but pathophysiologic mechanisms for chest patin in this group of patients are not known exactly. To observe the changes of left ventricular function in patients with angina and normal coronary angiogram, the authors analyzed the left ventricular systolic and diastolic function with echocardiogram and cardiac catheterization. METHODS: The authors performed resting and treadmill exercise electrocardiogram, 201TI dipyridamole scan, M-mode and Doppler echocardiogram, cardiac catheterization and coronary angiogram in patients with angina and normal coronary angiogram. The systolic and diastolic left ventricular function indices from M-mode and Doppler echocardiogram, left ventricular catheterization and coronary angiogram were analyzed in 12 patients excluding diabetes, hypertension, cardiomyopathy and esophageal motility disorders among 1626 patients who underwent coronary angiogram between Jan. 1991 and Aug. 1992 in Chonnam University Hospital. RESULTS: 1) Studied subjects were 12 patients, 5 male and 7 female, mean age was 51+/-9.4 year-old. Resting electrocardiograms were normal in 8 cases and ST-T changes in 4 cases. Ischemic ST-T changes were observed in all cases during treadmill exericise test and perfusion defects in 3 cases out of 8 cases during 201TI dipyridamole scan. 2) On echocardiogram, ejection fraction(EF) was 68.9+/-4.5%, fractional shortening(FS) 37.4+/-4.4%, ratio of left atrial to aortic root dimension(LAD/AOD) 1.2+/-0.1, OR slope 3.8+/-0.8c,/sec, mitral valve Doppler E/A velocity ratio[E/A(V)] 0.9+/-0.2, mitral valve Doppler E/A area ratio[E/A(a)]1.3+/-0.3, early diastolic deceleration rate(EDDR) 4.3+/-1.3m/sec2, isovolumic relaxation time(IVRT) 96.2+/-15.7msec, isovolumic contraction time(IVCT) 38.1+/-9.1 msec and aortic valve Doppler peak flow velocity[Ao(V)] 0.8+/-0.2m/sec. EF, FS, IVCT and A(V) were normal. LAD/AOD and IVRT were increased, but E/A(V), E/A(a), OR slope and EDDR were decreased compared to normal subjects. 3) On cardiac catheterization and angiogram, mean left ventricular end-diastolic pressure was 15.3+/-5.1mmHg and ejection fraction by left ventriculogram 78.2+/-7.4%. There was no regional wall motion abnormality. CONCLUSION: Above results suggest that angina with normal coronary angiogram may be associated with impaired left ventricular diastolic function.

Clinical Study for Coronary Artery Stenting

BACKGROUND: Coronary artery stent has been introduced recently to overcome major problems of percutaneous trausluminal coronary angioplasty(PTCA). To evaluate the success rate, complications and predictive factors associated with restenosis in coronary artery stenting, clinical analysis after coronary srtery stent was performed. METHODS: Sixteen patients who underwent coronary artery stent in Chonnam University Hospital beteen Apr. 1992 and Dec. 1993 were observed. The authors analyzed the stent dilivery success, rate complications and restenosis after follow-up coronary angiogram. RESULTS: 1) The palmaz-Schatz stents were implanted in 16 patients(12 male, 4 female, mean age : 53.3 years) and clinical diagnosis of patients were 7 myocardial infarction, 8 unstable angina and one stable angina. Stents were implanted in 10 cases of left anterior descending arteries and 6 cases of right coronary arteries. Three stents were implanted in a patient with long spiral dissection after middle right coronary artery PTCA, single stent was implanted in the other patients. 2) Stent delivery was successful in all cases, but acute stent thrombosis developed just after bail-out procedure for PTCA-induced intimal dissection in myocardial infarction patient who had multivessel lesion and intracoronary thrombus. Subacute stent thrombosis and major bleeding requiring transfusion were not documented. 3) On follow-up coronary angiogram in 10 patients, no restenosis observed in 5 right coronary arterial stents, but restenosis developed in 3 of 5 left anterior descending artery stents. Restenosis was observed in none of 4.0mm stents, two of six 3.5mm stents and one of two 3.0mm stents. 4) Stent restenosis was observed in 3 cases of positive201TI dipyridamole scan which was performed one month after coronary artery stenting. CONCLUSION: Coronary artery stent is a safe and effective in elective procedure. The restenosis rate after intracoronary stent is lower in right coronary artery than left anterior descending artery and larger stent.

Radiofrequency Catheter Ablation of Atrioventricular Accessory Pathways : Factors Influencing the Outcome of Catheter Ablation of Accessory Pathways

BACKGROUND: Catheter ablation of accessory pathways using radiofrequency(RF) energy was recently introduced to cure accessory pathway related tachyarrhythmias. The purpose of the present study was to evaluate the efficacy and safety of radiofrequency catheter ablation of accessory pathways and to determine factors influencing the outcome of catheter ablation. METHODS: Electrophysiology study was performed with standard technique and catheter ablation of accessory pathways using RF and conventional ablation technique. The outcome of RF catheter ablation were evaluated according to the location and the overtness of accessory pathways. Eighty patients(Mean +/-SD age, 36+/-15 years ; 50 male, 30 female)comprising 49(61%) with Wolff-Parkinson-White(WPW) syndrome and 31(39%) with atrioventricular reentry tachycardia(AVRT) using concealed bypass tract underwent RF catheter ablation for total of 85 accessory pathways in the Chonnam University Hospital. Five(6.3%) patients had multiple accessory pathways. RESULTS: Seventy-nine(92.9%) out of 85 pathways and all the pathways in 75(93.8%) out of 80 patients were ablated successfully. The success rate showed no significant difference between patients with overt accessory pathways and patients with concealed accessory pathways(92.0% vs. 93.9%). However, the success rate in right free wall location(72.7% of 11) was significantly lower than that in the other sites (95.9% of 74, p<0.05). More attempts were tried to ablate right-sided accessory pathway than left-sided pathways(6.4+/-24.1 vs. 3.8+/-6.8, p<0.05). Three(3.8%) pathways recurred within 30 minutes after the initial successful ablation. Four(5.1%) pathways recurred from 16 hours to 7 months after completion of the initial successful ablation session during the mean follow-up period of 43+/-24 weeks(range, 2-84 weeks). This late recurrence was more frequent, although statistically insignificant, in right-sided accessory pathways(11.1% vs. 3.3%, p=0.22). All 4 recurrent pathways(1 at the same session, 3 at the repeated sessions) reattempted for ablation were successfully ablated. As procedure-related complications, second degree AV block developed in a patients with mid septal and posteroseptal pahways and hemopericardium in a patients with a left anterolateral pathway. CONCLUSION: RF catheter ablation of atrioventricular accessory pathways is very effective and safe, with a success rate of 93.8% and a complication rate of 2.5%. Right-sided accessory pathways are more difficult to ablate than left-sided accessory pathways, requiring the development of a better technique for right free wall pathways.

Predictors of Successful Percutaneous Transluminal Coronary Angioplasty in Multivessel Disease

BACKGROUND: Percutaneous transluminal coronary angioplasty (PTCA) was initially applied in patients with proximal, discrete, single vessel disease, but complex multivessel PTCA has become feasible with increased operator experience and instrumental development. The authors analyzed the predictive factors concerning the success rate of multivessel PTCA. METHODS: To evaluate the predictive factors of the successful PTCA in multivessel disease, clinical and angiographic findings of 39 patients (male 31, female 8, age 58.4 9.9) with 84 multiple lesions, who admitted to Chonnam National University Hospital between January 1991 and December 1992, were analyzed. RESULTS: Overall success rate of 84 attempted lesions was 92.9%. Success rate of old aged group 65 years or older was 89.5% and that of below 65 years was 93.8%. Success rate in acute myocardial infarction was 80% and significantly lower than those of old myocardial infarction, unstable and stable angina. Success rate of AHA type C lesion was 75.0% and significantly lower than those of type A(100%), type B1(96.7%) and type B2(95.2%). Success rate according to target vessels was not significantly different. Angiographic findings including calcification, lesion length, angulation, TIMI flow grade, left ventricular function and left ventricular aneurysm didn't affect the success rate of multivessel PTCA significantly. CONCLUSION: Overall success rate of multivessel PTCA was 92.9%. The negative predictive factors affecting the success rate of multivessel PTCA were the acute myocardial infarction out of clinical factors and the AHA type C lesion out of angiographic factors.