This study was performed to investigate the biochemical properties of Acanthamoeba proteinase, its role in the pathogenesis of Acanthamoeba keratitis and the therapeutic effect of the homogenate of amniotic membrane as a proteinase inhibitors. Acanthamoeba castellanii isolated from the keratitis patient was cultured in PYG medium, in which the excretory and secretory products were analysed. The secretory proteinases of A. castellanii wre identified using in vitro azocasein assay, activity-PAGE, and various protein substrate degradation assays, and one of them was purified and characterized. The pruified secretory proteinase was a kind of serine proteinase. Its molecular weight was 105 kDa and optimal pH was 8.5. It was able to degrade the various protein substrates such as fibronectin, IgA, IgG, fibrinogen. The various proteinase ingibitors and the amniotic membrane homogenates were tested in vitro against the purified seirne proteinase. The amniotic membrane homegenates markedly showed the inhibitory effect against the enzyme activity and this inhibitory effect was also revealed in animal study. In vivo study, this purified proteinase was infected into 14 pigmented rabbit corneas, pretreated with steroids. The corneal lesions induced by both of the purified proteinase and A. castellanii, showed similar clinical findings each other, in which the stromal infiltration and opacity with epithelial defect was revealed. These corneal lesions were significantly inhibited without any side effects of the amniotic membrane homogenates. Conclusively, Acanthamoeba proteinase was closely associated with the pathogenesis of Acanthamoeba keratitis. This study provides a successful animal model of Acanthamoeba keratitis using pigmented rabbit. And the fact that Acanthamoeba-induced corneal lesions were inhibited by the amniotic membrane homogenate, suggested that the amniotic membrane homogenate have the ability of the serine protinase inhibition further investigative studies are also necessary.
Acanthamoeba castellanii ; Acanthamoeba Keratitis* ; Acanthamoeba* ; Amnion* ; Animals ; Cornea ; Fibrinogen ; Fibronectins ; Humans ; Hydrogen-Ion Concentration ; Immunoglobulin A ; Immunoglobulin G ; Keratitis ; Models, Animal ; Molecular Weight ; Peptide Hydrolases ; Serine ; Serine Proteases ; Steroids

No abstract available.
Carbon Monoxide* ; Carbon*

To investigate the effect of hyperoxia on EKG findings and to evaluate the applicability of EKG as noninvasive monitoring index of oxygen toxicity, 38 rabbits were continuously exposed to 6 different conditions-3 hyperbaric oxygenations (HBO-2.5, 3.5 and 5ATA, 100% O2), normobaric oxygenation (NBO, 100% O2), hyperbaric aeration (HBA-5ATA, 21% O2) and normobaric aeration (NBA, 21% O2)-for 120 minutes and their EKG and time to dyspnea and convulsion were recorded. Dyspnea and death were observed in exposure conditions of HBO-3.5 and HBO-5 (Positive rate of dyspnea; 10%, 100%, death; 10%, 25%, respectively) only, and convulsion in 4 oxygenation groups (NBO; 20%, HBO-2.5; 20%, HBO-3.5; 20%, HBO-5; 88%). Abnormal EKG findings included arrhythmia and ST-T changes and the incidences was increasing with doses(partial pressure of oxygen). In addition to EKG change, findings observed during exosure were dyspnea and convulsion in the order of appearence and when non specific ST-T change was accepted as positive (abnormal) finding, the frequency of abnormal EKG was statistically significant(p<0.01), but when it was excluded from positive results, the frequency of EKG change was not significant(p>0.05). These results suggest that the effect of hyperoxia on heart is myocardial ischemia and arrhythmia, that oxygenation more than 3.5ATA causes myocardial damage in 120 minutes exposure, and that EKG is valuable as monitoring index of oxygen toxicity.
Arrhythmias, Cardiac ; Dyspnea ; Electrocardiography* ; Heart ; Hyperbaric Oxygenation ; Hyperoxia* ; Incidence ; Myocardial Ischemia ; Oxygen ; Rabbits* ; Seizures

No abstract available.
Carcinoma, Renal Cell* ; Prostate*

No abstract available.
Carcinoma, Renal Cell* ; Prostate*

In vivo ethane production in rats was used as an index of oxygen toxicity. The rats were allocated to four exposure conditions; hyperbaric oxygenation (HBO=5 ATA, 100% O2), normobaric oxygenation (NBO=1 ATA, 100% O2), hyperbaric aeration (HBA=5 ATA, 21% O2) and normobaric aeration (NBA=1 ATA, 21% O2). After 120 minutes of exposure, the rats exposed to high concentration and/or high pressure oxygen exhaled significantly larger amounts of ethane than those exposed to NBA, and the differences in ethane production between any two groups were statistically significant (p<0.01). This finding supports the hypothesis that hypothesis that hyperoxia increase oxygen free-radicals and the radicals produce ethane as a result of lipid peroxidation. It is notable that the ethane exhalation level of the HBA group was significantly higher than that of the NBO group. This difference could not be accounted for by the alveolar oxygen partial pressure difference between the two groups.
Animals ; Ethane* ; Exhalation* ; Hyperbaric Oxygenation ; Hyperoxia* ; Lipid Peroxidation* ; Oxygen ; Partial Pressure ; Rats

BACKGROUND AND OBJECTIVES:Traditionally, down beat nystagmus is regarded as a sign of central nervous system dysfunction. But, several years has passed since Herdman et al reported the down beat nystagmus developed during treatment maneuvers for posterior semicircular canal benign paroxysmal positional vertigo(BPPV). We undertook this study to evaluate the character and clinical analysis of the positional or positioning down beat nystagmus, to discuss the clinical significance of positional or positioning down beat nystagmus as a diagnostic criteria of superior semicircular canal BPPV, and to propose the new treatment method. MATERIALS AND METHOD:From November 1999 to March 2004, we sampled the 103 patients with positional or positioning down beat nystagmus. Of these patients, we selected 16 patients except for the patients with central nervous system dysfunction, nonspecific or artifact result, idiopathic origin. RESULTS:All of 16 patients had no sign and radiologic result of central nervous system disorder. 10 patients was reported or suspected the diagnosis of posterior semicircular canal BPPV. Fatigability was reported in 9 patients and reversibility was reported in 1 patient. Average latency was checked less than 2 seconds. CONCLUSION:Although the diagnostic criteria of superior semicircular canal BPPV that we reported was not controversial, we expect that this criteria is useful in diagnosis for patients with atypical positional or positioning down beat nystagmus. And the new treatment method that we reported will has the better results than previous method.
Artifacts ; Central Nervous System ; Diagnosis ; Humans ; Semicircular Canals ; Vertigo*

No abstract available.
Magnesium Sulfate* ; Magnesium* ; Torsades de Pointes*

BACKGROUND: Aortic valve endocarditis(AVE) may produce secondary involvement of the mitral aortic-intervalvular fibrosa(MAIVF) and the anterior mitral valve leaflets(AMVL). These complications may result in the systolic regurgitation of blood from the left ventricular outflow tract into the left atrium, or formation of an aneurysm or perforation of the AMVL. Early recognition of these complications is important for optimal management and corrective surgery. The aims of the persent study were to examine the utility of transesophageal echocardiography(TEE) in the diagnosis of these subaortic complications compared to conventional transthoracic echocardiography(TTE) and to observe the prevalence and pattern of these complications. METHOD: Both TTE and TEE were performed in patients with AVE from June 1991 to June 1993. A 2.5 MHz probe was used for TTE and a 5 MHz biplane one for TEE with Hewlett Packard SONOS 1,000 All procedures were recorded in super VHS tape and reviewed by two experienced cardiologist. AVE was diagnosed clinically by the presence of continuous bacteremia or demonstration of vegetations during open heart surgery. RESULT: Ten consecutive patients with AVE underwent TTE and TEE of these patients, 6(60%) had involvement of subaortic structures, including one with an abscess in the MAIVF, two with perforation of the MAIVF into the left atrium, one with multiple vegetations in the AMVL, and two with pseudoaneurysm formation and perforation of the AMVL, TEE visualized all these lesions with high resolution images, whereas TTE detected only multiple vegetations in the AMVL in one patients and eccentric mitral regurgitation of unknown etiology in 2 patients. In 4 patients, corrective surgery was performed in which the TEE findings were confirmed. CONCLUSION: The results implicate that 1) involvement of the subaortic structures would be a common complication in patients with AVE, 2) TEE is superior to conventional TTE in the detection of these complications, and 3) routine screening with TEE would be necessary in patients with AVE to diagnose or exclude these subaortic complications.
Abscess ; Aneurysm ; Aneurysm, False ; Aortic Valve* ; Bacteremia ; Diagnosis ; Echocardiography* ; Echocardiography, Transesophageal ; Endocarditis* ; Heart Atria ; Humans ; Mass Screening ; Mitral Valve ; Mitral Valve Insufficiency ; Prevalence ; Thoracic Surgery

BACKGROUND: CYFRA 21-1 is a tumor marker which measures a fragment of cytokeratin 19 expressed by epithelial cells in bronchus. It is known that cytokeratin 19 is abundant in squamous epithelial cell cancer of the lung. However, if the incidence of elevated serum CYFRA 21-1 level in patients with benign lung diseases or pulmonary tuberculosis with severe parenchymal damage is high the specificity of CYFRA 21-1 could be decreased. The purpose of this study is to investigate the changes of serum CYFRA 21-1 according to the degree of parenchymal damage and the usefulness of CYFRA 21-1 for diagnosing possibly combined lung cancer in patients with pulmonary tuberculosis. METHOD: We studied the changes of serum CYFRA 21-1 according to the sputum AFB stain, radiologic manifestation and history of treatment in 81 patients with pulmonary tuberculosis, and 20 healthy persons, 25 patients with lung cancer, as a control group. CYFRA 21-1 concentration in serum was quantified by the immunoradiometry assay(Centocor (R)) RESULT: The results were as follow; Serum CYFRA 21-1 level was significantly lower in patients with pulmonary tuberculosis(1.54+/-1.19ng/mL, p<0.01) as compared to patients with lung cancer( 12.25+/-15.97ng/mL), and was slightly higher than the level in heathy persons(0.90+/-0.49ng/mL) but there was no significant difference. Serum CYFRA 21-1 level was below the cut-off value of 3.3ng/mL in 95 percent of patients with pulmonary tuberculosis but it was above the cut-off value in 64 percent of patients with lung cancer. Serum CYFRA 21-1 level was significantly higher in the initial treatment group(1.91+/-1.55ng/mL, p<0.05) as compared to the treatment failure group (0.92+/-0.30ng/mL). According to the sputum AFB smear, serum CYFRA 21-1 level in patients with negative result was slightly higher than the level in patients with positive result but there was no significant difference. According to the radiologic manifestation, serum CYFRA 21-1 level was significantly higher in patients with infiltrative lesion (2.15+/-1.63ng/mL, p<0.01) as compared to patients with destructive lesion (1.04+/-0.54ng/mL). As the size of cavity or destructive lesion was larger, the level was significantly lower(p<0.05). CONCLUSION: As serum CYFRA 21-1 level was significantly higher in the initial treatment group and patients with infiltrative lesion, it suppose to be closely related with the degree of parenchymal damage of the lung of the pulmonary tuberculosis. However CYFRA 21-1 could be useful method for diagnosing lung cancer even in patients with pulmonary tuberculosis combined with lung cancer because of the fact that it was below the cutoff value of 3.3ng/mL in 95 percent of patients with pulmonary tuberculosis.
Bronchi ; Epithelial Cells ; Humans ; Incidence ; Keratin-19 ; Lung ; Lung Diseases ; Lung Neoplasms ; Sensitivity and Specificity* ; Sputum ; Treatment Failure ; Tuberculosis ; Tuberculosis, Pulmonary*