29 isoniazid (INH) resistant isolated strains and INH sensitive reference strain (H37Rv) of Mycobacterium tuberculosis were analysed by polymerase chain reaction-single strand conformational polymorphism (PCR-SSCP) and NciI restriction mapping for the detection of mutations in katG gene and inhA gene. The katG gene was divided into 3 parts (Akat, Bkat, Ckat; each part is about 800 bp) and amplified, inhA gene was amplified as a whole. Each of the amplified 800 bp DNA was digested into small fragments of less than 400 bp with restriction enzymes for the direct PCR-SSCP analysis. Firstly, 10 strains were analysed. All the 10 isolates showed clearly distinct SSCP patterns in Bkat from that of the reference strain, but only two isolates showed distinct SSCP patterns in Akat, and no isolated strain showed any distinct SSCP patterns in Ckat. 10 isolates also showed distinct SSCP patterns in inhA. NciI restriction mapping of Bkat showed mutation in codon 463 in 7 strains among 10 isolated strains. With these results an early detection strategy for the INH resistant M. tuberculosis was applied to the rest of 19 isolated INH resistant strains. Firstly, isolates were screened by Ncsl mapping in Bkat, and 13 strains showed mutations in codon 463. Secondly, the rest of 6 INH resistant isolates were analysed by PCR-SSCP with restriction enzyme digestion (PCR-SSCP-RE) in Bkat, and all the strains showed distinct SSCP patterns from that of the INH sensitive reference strain. This proved our strategy as effective and economic and time saving method in early detection of INH resistant M. tuberculosis.
Codon ; Diagnosis* ; Digestion ; DNA ; Isoniazid* ; Korea* ; Mycobacterium tuberculosis* ; Mycobacterium* ; Polymorphism, Single-Stranded Conformational ; Restriction Mapping ; Tuberculosis

Clostridium perfringens is an anaerobe responsible for a wide range of diseases in animals and humans. Symptoms associated with C. perfringens food poisoning are caused by enterotoxin expressed only during sporulation of C. perfringens. It has been known that only 6% of global C. perfringens isolates carry the enterotoxin gene. We found 2 strains of enterotoxigenic C. perfringens out of 33 strains isolated from various sources in Korea using PCR. It was also found that these two strains were both type A that were strongly associated with food poisoning by checking the presence of four major lethal toxins (a-, B-, e-, l-toxin) using PCR. These results suggest that foodborne illness caused by C. perfringens may be common in Korea and that public education is necessary to prevent contamination of foods by this organism.
Animals ; Clostridium perfringens* ; Clostridium* ; Education ; Enterotoxins* ; Foodborne Diseases ; Humans ; Korea* ; Polymerase Chain Reaction

Hypertension is a serious health problem due to high frequency and concomitant other diseases including cardiovascular and renal dysfunction. Olmesartan cilexetil is a new antihypertensive drug associated with angiotensin II receptor antagonist. This study was conducted to evaluate the mutagenicity of olmesartan cilexetil by bacterial reverse mutation test using Salmonella typhimurium (TA100, TA1535, TA98, and TA1537) and Escherichia coli (WP2 uvrA). At the concentrations of 0, 62, 185, 556, 1667, and 5000 microg/plate, olmesartan cilexetil was negative in both Salmonella typhimurium and Escherichia coli regardless of presence or absence of metabolic activation system (S9 mix). These results demonstrate that olmesartan cilexetil does not induce bacterial reverse mutation.
Biotransformation ; Escherichia coli ; Hypertension ; Imidazoles ; Receptors, Angiotensin ; Salmonella typhimurium ; Tetrazoles

BACKGROUND/AIMS: Ambulatory blood pressure (BP) monitoring has been widely recommended for evaluating the status of BP, but is lacking in practicality. Determination of the specific time points for BP measurement that are representative of 24-hour mean BP could be useful and convenient in hypertensive patients with chronic kidney disease (CKD). METHODS: A total of 1,317 patients for whom 24-hour ambulatory BP monitoring was performed were enrolled in a multicenter study on hypertensive CKD. We analyzed the time points at which systolic blood pressure (SBP) values exhibited the smallest differences from 24-hour mean SBP (mSBP). We included office mSBP and analyzed the relationships between SBPs at the office and the time points with the smallest differences from 24-hour mSBP using several methods. RESULTS: The time points with the smallest differences from 24-hour mSBP were 7:00 AM, 2:00 PM, and 9:30 PM. In regression analysis, SBPs at 7:00 AM and 9:30 PM were better correlated with 24-hour mSBP than SBPs at 2:00 PM and the office. The proportions of patients with SBPs within 30% of 24-hour mSBP were higher at 7:00 AM and 9:30 PM. The best consistency between the uncontrolled hypertensive groups, defined as > or = 135 mmHg of 24-hour mSBP and higher values of SBPs corresponding to 135 mmHg of 24-hour mSBP, were observed at the 7:00 AM and 9:30 PM time points. CONCLUSIONS: The specific time points for SBPs that correlated well with 24-hour mSBP in hypertensive CKD patients were 7:00 AM and 9:30 PM.
Adult ; Aged ; *Blood Pressure ; Blood Pressure Monitoring, Ambulatory/*methods ; Circadian Rhythm ; Cross-Sectional Studies ; Female ; Humans ; Hypertension/*diagnosis/physiopathology ; Male ; Middle Aged ; Office Visits ; Predictive Value of Tests ; Prospective Studies ; Renal Insufficiency, Chronic/*diagnosis/physiopathology ; Republic of Korea ; Time Factors ; Young Adult

Genetically modified (GM) soybean (carrying the EPSPS transgene) is the most common GM food in Korea. In order to assess whether genetic modification increases the allergenic risk of soybeans, the allergenicity and IgE-reactive components of wild-type and GM soybean extracts were compared in allergic adults who had been sensitized to soybeans. We enrolled 1,716 adult allergy patients and 40 healthy, non-atopic controls. Skin prick tests and IgE enzyme linked immunosorbent assays (ELISAs) were performed using wild-type and GM soybean extracts, along with other common inhaled allergens. The specificities of serum IgE antibodies from allergic patients and the identities of the IgE-reactive components of the soybean extracts were compared using ELISA inhibition testing, 2-dimensional gel electrophoresis, and IgE immunoblotting. To evaluate the effects of digestive enzymes and heat treatment, the soybean extracts were heated or pre- incubated with or without simulated gastric and intestinal fluids. The IgE sensitization rates to wild-type and GM soybeans were identical (3.8% of allergic adults), and circulating IgE antibodies specific for the two extracts were comparable. The results of the ELISA inhibition test, SDS-PAGE, and IgE immunoblotting showed a similar composition of IgE-binding components within the wild-type and GM extracts, which was confirmed using two-dimensional gel electrophoresis, IgE immunoblotting, and amino acid sequencing. None of the subjects had a positive response to purified EPSPS protein in the skin prick test, ELISA, or IgE immunoblot analysis. These findings suggest that the IgE sensitization rate to GM soybean extracts is identical to that of wild-type soybean extracts in adult allergy patients. In addition, based on both in vivo and in vitro methods, the allergenicity of wild type and GM soybean extracts was identical.
Soybeans/*immunology ; Skin Tests ; Protein Structure, Tertiary ; *Plants, Genetically Modified ; Middle Aged ; Immunoglobulin E/blood/chemistry ; Immunoblotting ; Humans ; Food Hypersensitivity/etiology/*immunology ; Food/*adverse effects ; Enzyme-Linked Immunosorbent Assay ; Electrophoresis, Gel, Two-Dimensional ; *Crops, Agricultural ; Allergens/*immunology ; Adult ; Adolescent

Most cases of hydronephrosis are caused by urinary tract obstruction. However, excessive polyuric syndrome rarely gives rise to non-obstructive hydronephrosis, megaureter, and a distended bladder. The authors report here on two cases of congenital nephrogenic diabetes insipidus (NDI) with severe bilateral hydronephrosis and megaureter. It is Interesting that the patients were symptomless except for their polyuria, and they both presented with bilateral hydronephrosis. Fluid deprivation testing revealed the presence of AVP resistant NDI. Gene analysis for these patients showed the AVP receptor 2 (V2R) missense mutations (Q225X and S126F), which have previously been reported on in other studies. We made the diagnosis of NDI by using a physiologic test, and we confirmed it by mutation analysis of the V2R gene.
Receptors, Vasopressin/*genetics ; Polyuria/complications/diagnosis/genetics ; Mutation, Missense ; Male ; Hydronephrosis/complications/*diagnosis/genetics ; Humans ; Diabetes Insipidus, Nephrogenic/complications/*diagnosis/genetics ; DNA Mutational Analysis ; Adult

BACKGROUND: Hyperkalemia is a common, potentially life-threatening disorder. We studied the causes and treatments of hyperkalemia in korean with and without dialysis. We also sought to analyze how to treat and prevent hyperkalemia. METHODS: we reviewed medical records of 60 patients with serum or plasma; potassium levels more than 6.0 mEq/L. Twenty of them had been on maintenance dialysis. We analyzed causes of hyperkalemia and studied the sequence of it's treatment. RESULTS: The causes of hyperkalemia were mostly related to noncompliance(55%) and diet(35%) in patients with dialysis. In contrast, acute renal failure (72.5%) and drugs(15%) were the leading causes in patients without dialysis. Drugs causing hyperkalemia included angiotensin-converting enzyme inhibitor, NSAID and potassium-sparing diuretics. Sequence of various treatments were in order intravenous calcium, dialysis, insulin and calcium polystyrene sulfonate in patients with dialysis but intravenous calcium, insulin, calcium polysyrene sulfonate with dialysis. There was no case of death by arrhythmia caused hyperkalemia. CONCLUSION: The prevention of hyperkalemia in korean included dietary potassium restriction and compliance on dialysis in patients with dialysis, and careful selection of drugs especially in patients with chronic renal failure without dialysis.

Stevens-Johnson syndrome and toxic epidermal necrolysis are acute life-threatening conditions. Aromatic antiepileptic drugs such as carbamazepine, phenytoin and phenobarbital are frequently associated with severe adverse cutaneous reactions including Stevens-Johnson syndrome and toxic epidermal necrolysis. Oxcarbazepine, a 10-keto derivative of carbamazepine has been reported to have a similar range of efficacy and fewer side effects than carbamazepine because it is a prodrug of a monohydroxy derivative. Because there are few clinical records of oxcarbazepine induced erythemamultiforme-like skin eruptsions, we reported a case of Stevens-Johnson syndrome thought to be caused by the use of oxcarbazepine in a 66-year-old male. Diffuse erythematous maculopapular eruptions were developed on his whole body 30 days after beginning with oxcarbazepine. The clinical and histologic findings of the patient were compatible with Stevens-Johnson syndrome. Although it is rare, oxcarbazepine can cause severe adverse cutaneous reactions.
Aged ; Anticonvulsants ; Carbamazepine ; Humans ; Male ; Phenobarbital ; Phenytoin ; Skin ; Stevens-Johnson Syndrome*

BACKGROUND: The serum to plasma potassium [K] difference in patients(n=42) on maintenance hemodialysis more than one year was analyzed to evaluate the prevalence of pseudohyperkalemia among them. METHODS: In all 42 hemodialysis patients, the following predialysis serum and plasma K concentration frequencies were as followed : serum K-normal (3.5-5.5 mEq/L) 24, high(>or=5.6 mEq/L) 18, low(

Hepatocellular carcinoma (HCC) is one of the most common malignancies. Many factors are considered to be etiology associated with HCC; the important factors are hepatitis B and C viruses and alcohol. Cirrhosis is present in the majority of patients with HCC. It is assumed that all diseases, which lead to liver cirrhosis, may be complicated by the development of HCC. We report a 36-year-old man with HCC which developed from cardiac cirrhosis caused by constrictive pericarditis in whom both hepatitis B virus and hepatitis C viral marker tests were all negative. CT scan of his heart showed pericardial calcification with diastolic dysfunction of right ventricle. Abdominal CT scan revealed mottled mosaic pattern of contrast enhancement of liver parenchyme and two hepatic lesions that were considered to be HCCs. Left lateral segmentectomy of liver was performed. There were two well-circumscribed masses which were confirmed to be HCC and the remaining hepatic parenchyma showed bridging fibrosis between central zonal regions. To our knowledge, this is the first case of HCC complicating cardiac cirrhosis in Korea.
Adult ; Bromhexine ; Carcinoma, Hepatocellular/*complications/radiography ; Humans ; Liver Cirrhosis/*complications/radiography ; Liver Neoplasms/*complications/radiography ; Male ; Pericarditis, Constrictive/*complications/radiography