Cost-Effectiveness Analysis of Hypertension Screening in the Korea National Health Screening Program

Background and Objectives@#To evaluate the cost-effectiveness of routine hypertension (HTN) screening as a part of the national health-screening program. @*Methods@#Two aspects of cost-effectiveness were examined using the national general healthscreening program. First, the cost of case-finding was computed for 5-year interval age groups. Second, the cost per quality adjusted life years (QALYs) gained were estimated for 12 different scenarios varying examination starting age, pattern and interval compared with no screening. @*Results@#The cost of finding one new HTN case was low as 26,284 Korean won (KRW) (approximately [approx.] United States Dollar 21) for 70–79 years old to as high as 70,552 KRW for 40–44 years old. Compared with no screening, the costs per QALYs of the following screening strategies were below the incremental cost-effectiveness ratio threshold (approx.KRW 30.5 million): first screening examination with the second confirmatory examination in adults aged ≥40 years every 3 years (KRW 10.2 million), every 2 years (KRW 13.2 million), or annually (KRW 19.9 million). One-way sensitivity analyses suggest that the results were mostly influenced by the sensitivity of the first screening examination, followed by the examination rate of the second confirmatory examination. @*Conclusions@#HTN screening as a part of routine national health screening program was cost-effective for adults aged 40 years or older. The most cost-effective HTN screening strategy was the first screening examination with the second confirmatory examination in aged 40 years or older every 3 years.

Cost-Effectiveness Analysis of Hypertension Screening in the Korea National Health Screening Program

Background and Objectives@#To evaluate the cost-effectiveness of routine hypertension (HTN) screening as a part of the national health-screening program. @*Methods@#Two aspects of cost-effectiveness were examined using the national general healthscreening program. First, the cost of case-finding was computed for 5-year interval age groups. Second, the cost per quality adjusted life years (QALYs) gained were estimated for 12 different scenarios varying examination starting age, pattern and interval compared with no screening. @*Results@#The cost of finding one new HTN case was low as 26,284 Korean won (KRW) (approximately [approx.] United States Dollar 21) for 70–79 years old to as high as 70,552 KRW for 40–44 years old. Compared with no screening, the costs per QALYs of the following screening strategies were below the incremental cost-effectiveness ratio threshold (approx.KRW 30.5 million): first screening examination with the second confirmatory examination in adults aged ≥40 years every 3 years (KRW 10.2 million), every 2 years (KRW 13.2 million), or annually (KRW 19.9 million). One-way sensitivity analyses suggest that the results were mostly influenced by the sensitivity of the first screening examination, followed by the examination rate of the second confirmatory examination. @*Conclusions@#HTN screening as a part of routine national health screening program was cost-effective for adults aged 40 years or older. The most cost-effective HTN screening strategy was the first screening examination with the second confirmatory examination in aged 40 years or older every 3 years.

Comparison of the Effects of Ezetimibe-Statin Combination Therapy on Major Adverse Cardiovascular Events in Patients with and without Diabetes: A Meta-Analysis

BACKGROUND: Ezetimibe-statin combination therapy has been found to reduce low density lipoprotein cholesterol levels and the risk of major adverse cardiovascular events (MACEs) in large trials. We sought to examine the differential effect of ezetimibe on MACEs when added to statins according to the presence of diabetes. METHODS: Randomized clinical trials with a sample size of at least 50 participants and at least 24 weeks of follow-up that compared ezetimibe-statin combination therapy with a statin- or placebo-controlled arm and reported at least one MACE, stratified by diabetes status, were included in the meta-analysis and meta-regression. RESULTS: A total of seven trials with 28,191 enrolled patients (mean age, 63.6 years; 75.1% men; 7,298 with diabetes [25.9%]; mean follow-up, 5 years) were analysed. MACEs stratified by diabetes were obtained from the published data (two trials) or through direct contact (five trials). No significant heterogeneity was observed among studies (I 2=14.7%, P=0.293). Ezetimibe was associated with a greater reduction of MACE risk in subjects with diabetes than in those without diabetes (pooled relative risk, 0.84 vs. 0.93; P heterogeneity=0.012). In the meta-regression analysis, the presence of diabetes was associated with a greater reduction of MACE risk when ezetimibe was added to statins (β=0.87, P=0.038). CONCLUSION: Ezetimibe-statin combination therapy was associated with greater cardiovascular benefits in patients with diabetes than in those without diabetes. Our findings suggest that ezetimibe-statin combination therapy might be a useful strategy in patients with diabetes at a residual risk of MACEs.

Discordance between ambulatory versus clinic blood pressure according to global cardiovascular risk group

BACKGROUND/AIMS: The detection of white coat hypertension (WCH), treated normalized hypertension, and masked hypertension (MH) is important to improve the effectiveness of hypertension management. However, whether global cardiovascular risk (GCR) profile has any effect on the discordance between ambulatory blood pressure (ABP) and clinic blood pressure (CBP) is unknown. METHODS: Data from 1,916 subjects, taken from the Korean Multicenter Registry for ABP monitoring, were grouped according to diagnostic and therapeutic thresholds for CBP and ABP (140/90 and 135/85 mmHg, respectively). GCR was assessed using European Society of Hypertension 2007 guidelines. RESULTS: The mean subject age was 54.1 ± 14.9 years, and 48.9% of patients were female. The discordancy rate between ABP and CBP in the untreated and treated patients was 32.5% and 26.5%, respectively (p = 0.02). The prevalence of WCH or treated normalized hypertension and MH was 14.4% and 16.0%, respectively. Discordance between ABP and CBP was lower in the very high added-risk group compared to the moderate added-risk group (odds ratio [OR], 0.649; 95% confidence interval [CI], 0.487 to 0.863; p = 0.003). The prevalence of WCH or treated normalized hypertension was also lower in the very high added-risk group (OR, 0.451; 95% CI, 0.311 to 0.655). CONCLUSIONS: Discordance between ABP and CBP was observed more frequently in untreated subjects than in treated subjects, and less frequently in the very high added-risk group, which was due mainly to the lower prevalence of WCH or treated normalized hypertension.

A Case of Constrictive Pericarditis due to Immunoglobulin G4-Related Disease

Immunoglobulin G4-related disease (IgG4-RD) can involve any organ. The majority of reported cases involve IgG4-RD of the biliary tract or pancreas, while only two cases of pericarditis have been reported. A 58-year-old man visited the outpatient clinic of our institution with a seven-day history of progressive dyspnea. Based on his transthoracic echocardiogram and transesophageal echocardiogram, he was diagnosed with constrictive pericarditis. The histopathology of his pericardiectomy revealed the cause of constrictive pericarditis to be IgG4-RD. Prednisolone (40 mg) was initiated after the pericardiectomy. As the patient's symptoms resolved, he was discharged and followed-up on an outpatient basis. This is the first case report of constrictive pericarditis caused by IgG4-RD in Korea.

Importance of Clinical Evaluations Related to Secondary Hypertension in Patients with Resistant Hypertension

Resistant hypertension is defined as poorly controlled status of blood pressure despite of optimal use of three or more antihypertensive drugs of different classes, including diuretics. Although exact prevalence of resistant hypertension is not known, it has been reported to be 12.8% among patients treated with antihypertensive drugs. It is important to evaluate a possible secondary cause in patients with resistant hypertension. We report a case of resistant hypertension with renal artery segmental stenosis that was not revealed in renal Doppler study. Blood pressure of the patient was well controlled after renal balloon angioplasty.

Arterial Ageing

Arterial ageing is characterized by age associated degeneration and sclerosis of the media layer of the large arteries. However, besides ageing, clinical conditions, which enhance oxidative stress and inflammation act to accelerate the degree of arterial ageing. In this review, we summarized the pathophysiology and contributing factors that accelerate arterial ageing. Among them, we focused on hypertension, the renin-angiotensin-aldosterone system and vascular inflammation which are modifiable causes of the arterial ageing process. Also, novel treatment targets derived from the disease models such as the Hutchinson Gilford Progeria Syndrome were reviewed.

Protective Role of Intercoronary Communication between Right Coronary Artery with Chronic Total Occlusion and Normal Left Circumflex Artery against Recurrent Myocardial Ischemia

Intercoronary communication is a very rare congenital malformation, which differs from coronary collaterals in variable aspects. It is larger in diameter, extramural in location and more resembles normal mature arterial features histologically. There are no consensus for the definition of intercoronary communiations, but some reports have suggested their protective role against myocardial ischemia due to its dual blood supply system. We report the case of a 72 year-old male smoker who had chronic total occlusion at the proximal portion of right coronary artery, which was communicated with a normal left circumflex artery. Although the patient had chronic total occlusion and subsequent in stent restenosis, there were no presentations of acute coronary syndrome or myocardial infarction.

High Serum Advanced Glycation End-Products Predict Coronary Artery Disease Irrespective of Arterial Stiffness in Diabetic Patients

BACKGROUND AND OBJECTIVES: Advanced glycation end-products (AGEs) contribute to the development of atherosclerosis. We investigated whether serum AGEs are related to the presence or severity of coronary artery disease (CAD), and explored the association between serum AGEs and arterial stiffness according to diabetes status in patients suspected of having CAD. SUBJECTS AND METHODS: The measurement of serum AGEs and brachial-ankle pulse wave velocity (baPWV) were performed in 145 consecutive patients (63+/-9 years, 58% men) who received a coronary angiogram for evaluation of CAD. RESULTS: Forty-four diabetics and 101 non-diabetics were classified into three subgroups based on the number of diseased vessels with obstructive CAD: 0, 1, and 2 or more vessel diseases (VDs). Serum AGEs were significantly higher in diabetics with obstructive CAD than in those without obstructive CAD (2.16+/-0.29 vs. 1.85+/-0.29 mU/mL, p=0.010) and were significantly correlated with the number of VDs only in diabetics (r=0.504, p<0.001). Serum AGEs were not significantly correlated with baPWV in diabetics or non-diabetics. In receiver operating characteristics analysis, the cut-off value of serum AGEs as a predictor of obstructive CAD was 1.98 mU/mL, with 64% sensitivity and 63% specificity in diabetics. In multiple regression analysis, serum AGEs independently predicted obstructive CAD and were associated with the number of VDs in diabetics. CONCLUSION: Serum AGEs independently predict obstructive CAD and the severity of coronary atherosclerosis irrespective of arterial stiffness only in diabetics. Evaluation of PWV and serum AGEs together may be more effective to identify the risk of CAD in diabetic individuals.

Left Ventricular Longitudinal Diastolic Function and Functional Reserve in ESRD Patients Starting Dialysis Treatment / 대한신장학회잡지

BACKGROUND: Abnormalities of the left ventricular (LV) diastolic dysfunction are common in patients with end-stage renal disease (ESRD). Recently, Doppler tissue imaging (DTI) has been introduced as a method to evaluate diastolic function or myocardial relaxation by measuring mitral annulus velocity during diastole. This study was undertaken to assess resting diastolic function and diastolic functional reserve during exercise in ESRD patients starting dialysis treatment. METHODS: Mitral inflow velocities by Doppler echocardiography and septal mitral annular velocities by DTI were measured at rest and during supine bicycle exercise in 22 new ESRD patients and 23 age- and sex-matched subjects with normal renal function as a control. RESULTS: LV end-diastolic and end-systolic dimensions, septal thickness, and left atrial volume index were significantly higher in patients with ESRD compared with those of controls (p<0.01). LV ejection fraction was significantly lower in ESRD group (p<0.05). There were no significant differences in mitral inflow velocities (E, E/A, DT) between the two groups except A velocity, which was significantly higher in ESRD group (p<0.01). However, early diastolic mitral annular velocity (E') at rest (5.3+/-1.3 cm/sec vs. 6.5+/-1.5 cm/sec, p=0.013) and augmentation of E' with exercise (deltaE') were significantly lower in ESRD group compared with controls (at 25W exercise, 1.3+/-1.6 cm/sec vs. 4.0+/-3.0 cm/sec, p=0.002; at 50W exercise, 3.3+/-2.3 cm/sec vs. 6.5+/-5.3 cm/sec, p=0.030). CONCLUSION: Unlike conventional mitral inflow parameters, longitudinal resting diastolic function and diastolic functional reserve during exercise assessed by DTI were significantly reduced in ESRD patients starting dialysis treatment.

The Prognostic Significance of ST Segment Depression Score in Acute Non ST Elevation Myocardial Infarction

BACKGROUND AND OBJECTIVES: A significant ST segment depression is known to be an independent risk factor for acute coronary syndrome (ACS). Defining high risk groups in non ST elevation myocardial infarction (NSTEMI) is especially important due the poor long term prognosis of these patients. The purpose of this study was to determine the prognostic significance of the degree of ST depression on admission, as determined by a novel ST depression scoring system. SUBJECTS AND METHODS: 68 patients, admitted to Yonsei Cardiovascular Hospital between Jan 2001 and Aug 2002, and diagnosed with acute non ST elevation myocardial infarction were included in this study. Analysis of the initial ECG on admission was retrospectively performed. RESULTS: ST depression scores > or =1 and <1 were present in 36 (Group I) and 32 (Group II) patients, respectively. The rate of multivessel disease was significantly higher in group I than II (76.7 vs. 50%, p=0.032), the use of glycoprotein IIb/IIIa inhibitors was more frequent in group I than II (25 vs. 6.3%, p=0.041) and the left ventricular ejection fraction was significantly lower in group I than II (44.6+/-14.5 vs. 54.5+/-11.6%, p<0.05). The one-year survival rates were 68.9 and 93.7% for Groups I and II, respectively; p=0.0095), with Group I having a significantly higher early in-hospital mortality rate compared to group II.( 27.8 vs. 3.1%, p=0.0058) The event free survival rate in group I was lower than that in group II (55 vs. 90.6%, p=0.001). CONCLUSION: The ST depression score may be useful as an objective prognostic factor in acute NSTEMI, which may be especially useful for prediction of the early in hospital prognosis.

Treatment of Diffuse In-Stent Restenosis Combined with Cutting Balloon Angioplasty and Intracoronary Holmium Brachytherapy

BACKGROUND AND OBJECTIVES: A cutting balloon angioplasty for the treatment of diffuse in-stent restenosis has been reported to be superior to conventional percutaneous transluminal coronary angioplasty. Intracoronary radiation therapy is also a novel technique for preventing a recurrence of in-stent restenosis following percutaneous coronary intervention. Holmium (166Ho) is a high-energy beta-emitter, which is available in liquid form. We performed a cutting balloon angioplasty, with subsequent intracoronary 166Ho brachytherapy, for the treatment of in-stent restenosis. SUBJECTS AND METHODS: Fifty two patients, with in-stent restenosis, were treated with cutting balloon angioplasy and intracoronary 166Ho brachytherapy. For the irradiation, a balloon approximately 10 mm longer than the stent was used. Radiation doses of 18 Gy at a depth of 1 mm from balloon-artery interface were used. A quantitative coronary angiography was performed during the procedure and at the 6-month follow-up. The patients were followed clinically for an average of 16.8+/-9.8 months. RESULTS: The procedures were successful in all patients. The minimal luminal diameter of in-stent restenosis lesions, initially and after treatment, and the lesion length were 0.58+/-0.30 and 2.55+/-0.29 mm, and 20.7+/-7.1 mm, respectively. Thirty four (65.4%) patients completed the angiographic follow-up at 6 months. The minimal luminal diameter of lesion and late loss were 2.03+/-0.83 and 0.57+/-0.79 mm, respectively. The target lesion restenosis rate was 14.7%. No patients presented with MACE, such as MI, death or stent thrombosis. CONCLUSION: The combination of cutting balloon angioplasty and intracoronary 166Ho brachytherapy was feasible, safe and effective for the treatment of diffuse in-stent restenosis.

A Case of Primary Unknown Squamous Cell Carcinoma Incidentally Found in the Thrombus After Pulmonary Embolectomy / 결핵

A thromboembolic event in patients later given a diagnosis of cancer is the result rather than the cause of the cancer. The risk of hidden cancer is significantly higher for patients with recurrent idiopathic thromboembolism compared to those with secondary deep vein thrombosis. Microemboli from hepatic or adrenal metastases and large-sized emboli from the great veins invaded by the tumor are the sources of tumor embolization. The intraarterial tumor emboli less likely invade the arterial wall. Thrombus formation and organization may be capable of destroying tumor cells within pulmonary blood vessels. Therefore, all tumor emboli are not true metastases. The treatment of deep vein thrombosis and pulmonary embolism in patients with cancer consists of anticoagulation with heparin and warfarin, venacaval filters, appropriate anti-neoplastic agents, and surgical methods(embolectomy, thromboendarterectomy). However, considerable literatures suggest that oral anticoagulant such as warfarin is ineffective in the treatment of those. We report a case of primary unknown squamous cell carcinoma incidentally found in the thrombus after pulmonary embolectomy.

A Case of Hepatocellular Carcinoma with Duodenal Invasion and Bleeding / 대한소화기내시경학회지

Recent advances in both the diagnosis and treatment of hepatocellular carcinoma have improved the prognosis and changed the clinical significance of the recently increasing distant metastases. Distant metastases found after successful treament of the primary lesions are of great clinical significance for the treatment of hepatocellular carcinoma. The duodenum is a rare site of hematogenous metastases or direct invasion from hepatocellular carcinoma. A 23 year old man was admitted with upper gastrointestinal bleeding. He had been diagnosed with hepatocellular carcinoma and treated by a left lobectomy and chemoembolization. The patient was admittted for 12 months after the treatment of the primary tumor. Endoscopic examination revealed a mass in the duodenal bulb that protruded into the lumen. He died due to massive hematemesis. We report on a rare case of hepatocellular carcinoma with duodenal invasion in a 23-year-old male patient.

A Case of Lambert-Eaton Myasthenic Syndrome Improved after Surgical Resection for Diagnosis of Small Cell carcinoma of the Lung / 결핵

Lambert Eaton myasthenic syndrome(LEMS) is a paraneoplastic syndrome caused by defects in the secretion of acetylcholine from the presynaptic membrane of nerve terminals and is strongly associated with small cell lung carcinoma. The pathogenesis of LEMS is the destruction of voltage gated calcium channels by an autoimmune process resulting in clinical manifestations consisting of lower extremity weakness, decreased deep tendon reflexes and autonomic dysfunctions. The diagnosis can be confirmed by the characteristic clinical features and repetitive nerve stimulation. The neurological symptoms and signs of LEMS may manifest themselves months before the clinical manifestation of the underlying malignancy. Therefore early diagnosis and treatment of the primary malignancy may become possible through the diagnosis of this rare paraneoplastic syndrome. We report a case of a patient diagnosed with LEMS who upon further evaluation for an underlying malignancy was found to have a 0.2cm sized nodular and infiltrative mass lesion at the bifurcation of the left apicoposterior segmental and anterior segmental bronchi by bronchoscopy. Although repeated bronchoscopic biopsies of the lesion was not able to disclose malignancy, under strong clinical suspicion left upper lobectomy was performed and subsequently the diagnosis of small cell carcinoma of the lung was confirmed. Muscle weakness began to improve starting from a week after the surgery, then reached a plateau 2 weeks later. Muscle weakness improved further after the trial of anticancer chemotherapy.

An unusual case of gastric carcinoma with synchronous non-Hodgkin's lymphoma

We report a case of synchronous gastric adenocarcinoma and abdominal non-Hodgkin's lymphoma in a 56-year-old man. An explo-laparotomy was performed for the purpose of palliative resection of the stomach and to evaluate the nature of splenic and peri-pancreatic mass lesions. The pathologic stage of the gastric carcinoma was stage IB (T2N0M0) and the clinical stage of the diffuse large cell type lymphoma was IIA2S. Following surgery and chemotherapy, the patient is now in a disease-free state.

Comparison of Epidemiological and Clinical Characteristics of Native Valve Endocarditis between 1979~1984 and 1991~1996 / 감염

BACKGROUND: The changes in the epidemiology of native valve endocarditis have been known in western countries recent years due to the decrease in the inci-dence of rheumatic heart disease, increased longevity of patients with valvular or congenital heart diseases, and the increase in degenerative heart disease due to the in-crease in the average life span of the general popula-tion. In this study, we analyzed and compared the epide-miological and clinical characteristics of patients with na-tive valvular endocarditis fro two different time periods. METHODS: We compared native valve endocarditis patients diagnosed from 1979 - 1984(group I) with those diagnosed from 1991 - 1996(group II). We used modified Duke' s criteria for the diagnosis and statistical analysis was done using SPSS window program. RESULTS: In our study, mean age of the population was higher in group II and significantly larger number of patients were over the age of 50 in group II. Involve-ment of multiple valves with vegetations and peri-valvular abscess were found more frequently in group II. Also, significantly higher percentage of patients from group II underwent surgical treatment. CONCLUSION: The results of this study suggest that the epidemiolocaland clinical characteristics of infective endocarsitis in Korea may change to resemble those in western countries. Further studies regarding this subject are needed.

Sensitivity and Specificity of Vi-Indirect Fluore scent Antibody Test in Diagnosis of Typhoid Fever / 감염

BACKGROUND: Typhoid fever is diagnosed by culture or serological study. The confirmative diagnosis of typhoid fever is made by culture of the causative orga-nism usually from body fluids. Serological test is a supportive diagnostic tool, which is useful for early dia-gnosis. In Severance Hospital, Vi-indirect fluorescent antibody test(Vi-IFAT) using the Vi-antigen of Salmo-nella typhi has been used in the diagnosis of typhoid fever since 1989. We investigated the test results from the past 7 years, in order to clarify the sensitivity and specificity of Vi-IFAT. METHODS: A retrospective study was done on pa-tients whose chief complaint was fever and who were tested using Vi-IFAT in the Severance Hospital from 1989 to 1996. The positive value for Vi-IFAT was de- fined as 1:64 or higher. RESULTS: The sensitivity and specificity of Vi-IFAT for typhoid fever was 94.4% and 95.1%, respectively. The positive and negative predictive values were 85.7% and 98.2% respectively. Positive rates of Vi-IFAT after fever onset increased with time and 68% were positive before the first week. From the first to the second week, 89.5% were positive and after the second week, 100% were positive. CONCLUSION: Vi-IFAT is not only a valuable sero-logic test for the diagnosis of typhoid fever, but also useful in the early diagnosis of the disease.