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Biomedical subjects

N Aosaki

Publications and source records attributed to N Aosaki.

At least 19 recordsLinked to original sources
PubMed2006

Prevalence and characteristics of depression in a Japanese leprosarium from the viewpoints of social stigmas and ageing. A preliminary report.

OBJECTIVE: To investigate the prevalence and characteristics of depressed patients living in a Japanese leprosarium who have been isolated by national law and are now becoming very elderly. METHODS: We surveyed the prevalence of depressed patients living in the National Tamazenshouen Sanatorium, a major leprosarium in Japan. We also investigated the characteristics of patients who had suffered a depressive episode during the last 5 years (2000-2004). The characteristics of residents who committed suicide were also studied. RESULTS: At the time of the investigation, 48 out of 385 (12.5%) patients were depressed or had experienced a depressive episode. Forty-one residents had committed suicide since the leprosarium was established in 1907. Somatic symptoms and depressive moods were the predominant symptoms and were not limited to symptoms unique to leprosy. The period of isolation was not statistically correlated with the GDS-SF or PGC morale scale scores. CONCLUSION: The findings of this study emphasize the importance of consultation psychiatric for elderly leprosy residents and could be used as a reference for treatment in countries with ageing leprosy residents.

Aged↗
PubMed2001

Adult T-cell leukemia with hypercalcemia-induced metastatic calcification in the lungs due to production of parathyroid hormone-related protein.

A 60-year-old man was diagnosed as adult T-cell leukemia with severe hypercalcemia because of production of parathyroid hormone-related protein. After admission, the patient had respiratory insufficiency with an infiltrative shadow in his lungs suggestive of pneumonia. However, neither improvement in respiratory function nor disappearance of the abnormal chest shadow was observed with administration of various antibiotics. An autopsy demonstrated the chest shadow had been caused by metastatic calcification associated with hypercalcemia due to production of parathyroid hormone-related protein. The possibility of metastatic calcification should be considered in patients with adult T-cell leukemia and hypercalcemia who have an abnormal chest shadow.

Calcinosis↗
PubMed1996

[Rhabdomyolysis related-acute renal failure in a patient with hyperosmolar nonketotic diabetic coma (HNKC): demonstration of myoglobin casts after normalization of renal function].

We report a patient with rhabdomyolysis secondary to hyperosmolar nonketotic diabetic coma (HNKC), who progressed to acute renal failure. A 43-year-old male with diabetes mellitus for three years was admitted to our hospital because of loss of consciousness. The laboratory findings at admission were as follows: serum glucose 1792 mg/dl, serum Na 129 mEq/1, BUN 71 mg/d1, serum creatinine 3.3 mg/d1, CPK 715 IU/1, plasma osmolality 370 mOsm/1, and negative urine ketone bodies. A diagnosis of HNKC was made. On the 2nd day, he had oliguria and the serum creatinine increased despite adequate treatment of HNKC by the administration of intravenous fluid and insulin. On the 4th day, CPK reached 47,300 IU/1, and serum myoglobin was also increased, indicating rhabdomyolysis. His renal function improved gradually and was almost normalized on the 20th day. Renal biopsy on the 23rd day showed myoglobin at the distal renal tubules, which appeared to be involved in the pathogenesis of renal failure by rhabdomyolysis. However, we found little abnormality association with diabetic nephropathy in the renal tissue. Since HNKC is known to induce acute renal failure rarely without diabetic nephropathy, these findings suggested that the acute renal failure was caused mainly by the rhabdomyolysis. Acute renal failure induced by rhabdomyolysis in patients with HNKC is rare, but fatal. The present study showed that the measurement of serum CPK and urine myoglobin was helpful for early diagnosis. Only 12 cases have been reported to have developed renal failure due to rhabdomyolysis among patients with HNKC. To our knowledge, we demonstrated for the first time that myoglobin at the distal renal tubules after renal function was normalized.

Acute Kidney Injury↗
PubMed1994

Protective effects of verapamil and adenosine treatment on high energy phosphate metabolism in ischemic and reperfused myocardium.

Isolated rat hearts were subjected to retrograde perfusion to investigate the protective effects of adenosine and verapamil on the myocardium. In group 1, the perfusate was standard Krebs-Henseleit buffer solution. The perfusate was changed to Krebs-Henseleit buffer containing verapamil (100 nM) in group 2, adenosine (100 microM) in group 3 and both drugs in combination in group 4 for 30 min before ischemia and during 20 min of reperfusion. Group 2 displayed a recovery of creatine phosphate but not of ATP at the end of reperfusion. In group 4, the recovery of both ATP and creatine phosphate was significantly greater than in group 1. The coronary flow of group 4 was significantly higher than that of the other groups. Treatment with both verapamil and adenosine before and after global ischemia may protect the ischemic myocardium by improving high energy phosphate metabolism and coronary circulation.

Adenosine↗
PubMed1994

IgA nephropathy associated with portal hypertension in liver cirrhosis due to non-alcoholic and non-A, non-B, non-C hepatitis.

A 69-year-old female was admitted to our hospital because of leg edema, proteinuria (2.1 g/day), and gross hematuria. She had non-alcoholic liver cirrhosis of unknown etiology. Esophageal varices also were found. Examination of the renal biopsy specimen revealed mesangial proliferative glomerulonephritis with IgA deposits. Propranolol was administered orally to reduce portal hypertension, resulting in a progressive decrease in urinary microalbumin excretion. This case suggests that portal hypertension is involved in the pathogenesis of IgA nephropathy in liver cirrhosis.

Aged↗
PubMed1993

Early release of neutrophil chemotactic factor from isolated rat heart subjected to regional ischaemia followed by reperfusion.

OBJECTIVE: The study was designed to demonstrate the time course of neutrophil chemotactic factor (NCF) release from blood-free isolated rat hearts and to clarify the characteristics of NCF in order to facilitate its identification. METHODS: Coronary effluents were collected every minute from Langendorff perfused rat hearts during ligation of the left coronary artery for 40 min and reperfusion for 60 min. The neutrophil chemotactic activity in the effluents was assayed using modified Boyden's chambers with rat neutrophils isolated from peripheral blood as the indicator cells. RESULTS: The NCF release started at 10 min of coronary artery occlusion. During the reperfusion period, NCF release peaked at 5 min (230% of preischaemic value). To clarify the characteristics of NCF, the changes in chemotactic activity were examined using various inhibitors and inactivators of possible NCF candidates (LTB4, PAF, 5-lipoxygenase, and thromboxane synthase). The heat stability of NCF was also examined to exclude heat labile molecules such as adenosine or complements appearing as NCF. Among the various substances examined, only PAF antagonists (CV-6209 and TCV-309 at concentrations of 10(-6) M and 10(-5) M respectively) abolished the chemotactic activity. However direct measurement of PAF in the effluents was unsuccessful. CONCLUSION: NCF is released from the heart early after ischaemic insult, with the highest peak occurring at 5 min of reperfusion. PAF related substances might be the primary NCF in the effluent but this remains to be determined.

Animals↗
PubMed1993

Iodine 125-phenylpentadecanoic acid and its beta-methyl substitute metabolism in cultured mouse embryonal myocytes--iodine-labelled fatty acids as tracers of myocardial high energy phosphate.

Iodine-labelled fatty acids have been proposed as new tracers of cardiac metabolisms. However, it is not clear how these tracers would reflect the intracellular metabolism. Therefore, we measured the uptake and release of iodine 125-labelled phenylpentadecanoic acid (IPPA), its beta-methyl substitute (BMIPP) and 201Tl in cultured myocytes of mouse embryos, and compared these values to intracellular adenosine triphosphate (ATP) content after metabolic inhibitions of oxidative phosphorylation by sodium cyanide (CN), glycolysis by 2-deoxyglucose (2-DG) or fatty acid beta-oxidation by lactate. The uptake and release of BMIPP was not changed by any inhibitors suggesting BMIPP would not be metabolized in the myocytes. The uptake of IPPA was significantly reduced by 2DG and 60-80% of IPPA was metabolized to hydrophilic catabolites. The correlation of BMIPP and IPPA uptake to intracellular ATP content were high (r = 0.89, p < 0.05; r = 0.86, p < 0.1), but there was poor correlation of 201Tl to ATP values (r = 0.53, n.s.). These results suggested that iodine-labelled fatty acids could be used as better tracers of myocardial metabolism than 201Tl.

Adenosine Triphosphate↗
PubMed1992

Enhanced myocardial adenylate cyclase activity in spontaneously hypertensive rats.

This study was designed to clarify the state of beta-adrenergic signal transduction and the disordered level of its transduction in hypertensive hearts, using myocardium from spontaneously hypertensive rats (SHR) as a generic model of essential hypertension. Beta-adrenergic receptor binding sites and dissociation constants in the extracted membranes of adult (70-100 days of age) SHR heart were not significantly different from those of Wistar-Kyoto (WKY) rats, the non-hypertensive control. The adenylate cyclase activities stimulated by isoproterenol with GTP, NaF and forskolin were significantly higher in SHR compared to those in WKY. To determine whether differences in signal transduction are natural or are a result of hypertension, we evaluated chronotropic responses in cultured cells of fetal hearts which had not been exposed to hypertension. Fetal cardiac muscle cells of SHR were more sensitive than WKY to isoproterenol stimulation over a wide concentration range. However, there were no statistically significant differences between these two strains with respect to the density of binding sites. These results suggest that in the transduction of adrenergic signals, alterations distal to the beta-receptors are present in the adult hearts of hypertensive rats, and, that the adrenergic signal transduction is already exaggerated in the pre-hypertensive fetal stage.

Adenylyl Cyclases↗
PubMed1991

Differential extractability of creatine phosphate and ATP from cardiac muscle with ethanol and perchloric acid solution.

To compare the extractability of creatine phosphate with that of ATP by alcohol extraction, both compounds were extracted from normal perfused rat heart tissues by using various stepwise concentrations of ethanol and 0.4 M HClO4. Powdered samples (6-15 mg wet wt) from the freeze-clamped tissues were homogenized in 2 ml of the ethanol solutions. After centrifugation, the supernatant was removed; each centrifuged sediment was rehomogenized with 2 ml of 0.4 M HClO4 and centrifuged. The supernatant was neutralized with 0.4 m KHCO3. The same powdered samples were directly homogenized with 2 ml of 0.4 M HClO4 and treated in the same manner. Only a small amount of ATP in the tissues was extracted by an 85% or higher concentration of ethanol. Further, about 13% of the tissue ATP was not extractable by the subsequent perchloric acid extraction. In contrast to ATP, creatine phosphate in the tissues was partially extracted by 95% ethanol and nearly all of the tissue creatine phosphate was extracted by 70% ethanol. The total creatine phosphate obtained by 70% ethanol and by subsequent perchloric acid extraction was significantly higher than that obtained by direct perchloric acid extraction. From these results, it was concluded that the extractability of creatine phosphate in the tissue by alcohol extraction is clearly different from that of ATP. Additionally, the stepwise extraction is recommended as a useful method for the extraction of energy metabolites in perfused rat heart tissue.

Adenosine Triphosphate↗
PubMed1991

Effects of fura-2 and indo-1 on [Ca++]i in spontaneously beating cultured heart cells.

Changes in contractility and intracellular free Ca([Ca++]i) were measured in spontaneously beating cultured heart cells following exposure to indo-1 acetoxymethyl ester (indo-1AM) and fura-2 acetoxymethyl ester (fura-2AM). Although a 10 microM concentration of indo-1AM slightly decreased the beating rate, 5 and 10 microM concentrations of fura-2AM produced arrest of contraction within 10 min. However, contractility returned to normal after washing. With indo-1, the diastolic and peak systolic levels of [Ca++]i were 282 +/- 23 and 1107 +/- 122 nM, respectively, and 84 +/- 8 and 582 +/- 93 nM, respectively, with fura-2. The difference between the indo-1 and fura-2 generated responses are statistically significant (p less than 0.01). These results demonstrate that indo-1 and fura-2 can affect [Ca++]i, but the influence of indo-1 is less than that of fura-2 in the heart cells.

Animals↗
PubMed1990

Effects of carvedilol on serum lipids in hypertensive and normotensive subjects.

The effects of carvedilol (an alpha.beta-blocker) on lipid metabolism were assessed in addition to its hypotensive effect. The subjects were 18 men and 18 women, 20 with hypertension and 16 normotensives with other conditions requiring carvedilol treatment. They were aged from 31 to 79 years and were given a daily dose of 5-20 mg carvedilol (average, 9.7 mg/day) for 12 weeks. Significant falls were seen in blood pressure and heart rate after 12 weeks in the hypertensive subjects (mean +/- SE) (systolic: from 164 +/- 2 to 141 +/- 2 mm Hg, P less than 0.001; diastolic: from 98 +/- 1 to 85 +/- 2 mm Hg, P less than 0.001; heart rate: from 71 to 65 beats/min, P less than 0.001). Smaller changes in blood pressure and heart rate were seen in the normotensive subjects, with the fall in systolic pressure being significant (from 143 +/- 3 to 135 +/- 2 mm Hg, P less than 0.01). There were no significant changes in the overall serum total cholesterol, triglycerides, high-density lipoprotein (HDL) cholesterol, and phospholipid levels. In the subgroup with a pretreatment serum triglyceride level of greater than 150 mg/dl, a significant fall of 52.1 mg/dl was seen (P less than 0.05). Lipoprotein analysis showed a significant fall in alpha-lipoprotein levels (P less than 0.05). The atherogenic index did not change significantly, and it was concluded that carvedilol was an effective antihypertensive agent that produced no adverse effects and possibly had beneficial effects on lipid metabolism.

Adrenergic beta-Antagonists↗
PubMed1990

[Diagnosis of left ventricular aneurysm by exercise thallium-201 myocardial single photon emission computed tomography].

To diagnose and characterize post-infarction left ventricular aneurysms, we performed exercise thallium-201 myocardial single photon emission computed tomography (SPECT) combined with selective coronary angiography and left ventriculography. The subjects consisted of 79 patients with acute myocardial infarction; 42 with anteroseptal, three with both anterior and inferior, 29 with inferior and five with posterior infarction. Visual classification of ventricular wall morphology by either a horizontal or a vertical long-axis image was designed into convergent (C), parallel (P) and divergent (D) types, according to the interrelationship between either septal and lateral wall or anterior and inferior wall, respectively. This method was applied in post-stress and delayed images, and these patients were divided into five groups (Group A-E) in accordance with varying morphological types from the post-stress to the delayed as follows: C-C (Group A, 36 patients), P-C (Group B, 8), P-P (Group C, 7), D-P (Group D, 5) and D-D (Group E, 23). A high incidence (21/23) of a left ventricular aneurysm by left ventriculography was recognized in Group E patients in comparison with other Groups. Provided that either Group D or E (all patients had anterior infarction) had left ventricular aneurysms, the diagnostic sensitivity, specificity and accuracy were 89%, 92% and 86%, respectively. Two of three patients with false negative diagnosis had only apical involvement. Furthermore, these two Groups had significantly larger defect scores as calculated by polar maps than did the other three Groups. When patients with anterior infarction with defect scores of 200 or greater were defined positive, the sensitivity, specificity and accuracy of ventricular aneurysms were 96%, 75% and 86%, respectively. One false negative case was apical infarction, and one of the two false positive cases were extensive anteroseptal infarction involving the apex. These results suggest that a left ventricular aneurysm which is important in predicting prognostic sequence could be diagnosed only by exercise SPECT, and that it could be characterized by extensive and severe apicoanterior infarction and a divergent-type ventricular wall arrangement on a post-stress SPECT image.

Exercise Test↗
PubMed1988

[Quantitation of the severity of coronary artery disease using thallium-201 tomographic scores].

To evaluate coronary artery disease, a new quantitative thallium-201 (201T1)-tomographic scintigraphic score (TSS: modified Massie's score) using oxygen consumption (METS) was developed and compared with coronary angiographic score (CAG-S) in 27 patients (eight patients with normal coronary angiograms, and five, eight and six patients with one, two and three vessel disease, respectively) without previous myocardial infarction. All patients received both coronary angiography and the treadmill exercise test using 201T1-myocardial single photon emission computed tomography (SPECT) within two weeks. The redistribution area (RA) and washout rate area (WA) were derived from the circumferential profile analysis using apical (A), midventricular (M) and basal (B) short-axis images. To obtain TSS values, the sum of these values was divided both by percentage of the age-predicted maximal heart rate (%PMHR) and the METS value as follows: TSS = [RA (A, M, B) + WA (A, M, B)]/(%PMHR x METS). The results were as follows: 1. TSS values were 6.4 +- 1.6, 9.4 +/- 2.2, 24.2 +/- 12.0 and 30.6 +/- 5.0 (mean +/- SD) in normal, one, two and three vessel disease groups, respectively. Significant differences were found among each group except between two and three vessel disease groups. 2. The detectability of significant coronary artery disease was 89% (17/19) except in two patients with one vessel disease. 3. A high correlation coefficient was found between TSS (X) and CAG-S (Y), i.e., Y = 0.8X - 3.5 (r = 0.944, p less than 0.001). It was concluded that the tomographic scintigraphic score (TSS) is useful not only for detecting, multivessel disease but also for totally-evaluating its severity, extent and influence on collateral supply, and could be used for analyzing prognosis and the selection of therapeutic interventions.

Aged↗
PubMed1985

[A case of immature mediastinal teratoma].

A case of mediastinal immature teratoma was treated with a multimodality approach that included surgery, chemotherapy, and radiotherapy. Serum alpha-fetoprotein at admission was elevated and changed in parallel with the therapy and tumor growth. The patient died of sudden respiratory failure 18 months after admission. Mediastinal immature teratoma with elevated serum levels of alpha-fetoprotein carries a poor prognosis, as does endodermal sinus tumor. We concluded that this condition should most probably be treated with a combination of intensive chemotherapy, surgical resection, and radiotherapy.

Adolescent↗