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Biomedical subjects

S Takizawa

Publications and source records attributed to S Takizawa.

At least 19 recordsLinked to original sources
PubMed1992

Simultaneous cardio-cerebral ultrasonic measurement technique for assessing the interrelationship between cardiac and cerebral circulations in elderly subjects: a preliminary study.

To assess the interrelationship between the cardiac and cerebral circulations, simultaneous measurements of cardiac output (CO) and common carotid blood flow volume (CCBFV) was performed by M-mode echocardiography of the left ventricle, and quantitative ultrasonic Doppler blood flowmetry of the common carotid artery. The subjects studied were 12 healthy persons living in a home for the elderly ranging in age from 62 to 99 years. These subjects were divided into two groups: those who were in their 90s (Group I, 5 females) with a mean age of 93.6 +/- 3.5 years (mean +/- SD), and those who were in their 60s to 80s (Group II, 1 male and 6 females) with a mean age of 77.1 +/- 8.1 years. The average CO in Group I was 2.85 +/- 0.37 L/min, and 4.18 +/- 0.52 L/min in Group II. The average CCBFV was 4.74 +/- 0.64 dl/min in Group I, and 4.44 +/- 1.01 dl/min in Group II. The ratio of CCBFV to CO was 16.6 +/- 1.32% in Group I, and 10.6 +/- 1.45% in group II. Good linear correlations of y = 1.44x +0.65 (r = 0.82) in Group I and y = 1.58x - 2.15 (r = 0.81, p less than 0.05) in Group II were observed between CO (x) and CCBFV (y). No such close correlations were observed between CCBFV and other indices of left ventricular function such as circumferential fiber shortening or fractional shortening of the diameter of the left ventricle (r less than or equal to 0.56, p greater than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1992

Fibrinolysis and fibrinogenolysis in patients with thrombotic disease.

In order to assess the fibrinolytic state in thrombotic disease, plasma levels of fibrin degradation products (FbDP) and fibrinogen degradation products (FgDP) were measured in 126 patients with a variety of thrombotic diseases. Mean plasma concentrations of both FbDP and FgDP were significantly elevated in patients with thrombotic disease as compared with healthy subjects. Plasma concentrations of FgDP were positively correlated with FbDP (r = 0.667, P less than 0.001). When analysed according to the disease categories, the magnitude of elevations of FbDP and FgDP was most prominent in venous thrombotic disease such as deep vein thrombosis and pulmonary embolism. These findings indicate that fibrinolysis is accelerated in patients with thrombotic disease and that fibrinolysis is frequently accompanied by some fibrinogenolysis in these patients.

Enzyme-Linked Immunosorbent Assay↗
PubMed1992

Effect of 1,25-dihydroxyvitamin D3 on the female reproductive system in rats.

Parenteral application of the active metabolite of vitamin D3, 1,25-dihydroxyvitamin D3, has been anticipated to have remarkable efficacy in secondary hyperparathyroidism. However, in a reproduction seg. I study in rats, poor reproductive performance was reflected in a decrease in the number of matings, implantations and live births. These changes were though reversible after treatment with the compound was discontinued. In order to clarify the mechanism of these reversible toxicities, the following were examined in female rats treated with the D3 metabolite: 1. effect on the estrous cycle (no treatment for 2 weeks, treatment for 3 weeks and recovery for 2 weeks), and 2. effect on the maintenance of pregnancy (treatment for 2 weeks before mating and during the gestation period). In both groups, the levels of calcium, calcitonin, PTH and progesterone in serum were measured, and histopathological examination of the thyroid, parathyroid, ovary and uterus was carried out. The following results were observed: 1) disturbance of the estrous cycle, 2) hypofunctional changes in the corpus luteum in the ovary, and the epithelium, endometrium and uterine gland in the uterus with a decrease in the serum progesterone level and 3) hypercalcemia with a decrease in calcitonin or PTH levels in serum with morphological changes including atrophy and cyst-formation in the parathyroid. However, the above changes were reversible, and recovery was observed after administration of the compound was discontinued. These results indicate that the hypercalcemia caused by 1,25-dihydroxyvitamin D3 disrupts endocrinological homeostasis which in turn temporarily disrupts the female reproductive system. Furthermore, it was suggested that 1,25-dihydroxyvitamin D3 itself directly influences on endocrinological organs (hypothalamus, pituitary, parathyroid and thyroid) and reproductive organs (ovary and uterus).

Animals↗
PubMed1992

[Clinical efficacy of ceftriaxone when administered once daily for respiratory tract infections in patients with advanced ages].

Ceftriaxone (CTRX), a new third generation cephalosporin, was investigated upon once daily administration for its clinical efficacy and safety on respiratory tract infections in patients with advanced ages. The results are summarized as follows: 1. Clinical responses to CTRX of 48 cases of advanced age patients with respiratory tract infections were good with an efficacy rate of 89.6%. 2. Adverse reactions to CTRX were mainly exanthema in 7 cases (14.6%). 3. Serum levels of CTRX were determined in 4 cases after intravenous drip infusion of 2 g CTRX. Serum levels were analyzed by one-compartment model. There was no evidence of accumulation of CTRX in the patients with advanced ages.

Aged↗
PubMed1991

The effects of a competitive NMDA receptor antagonist (CGS-19755) on cerebral blood flow and pH in focal ischemia.

We report the effects of intravenous infusion of CGS-19755, a potent competitive N-methyl-D-aspartate (NMDA) antagonist, on local cerebral pH (LCpH) and local CBF (LCBF) in rats with occluded left middle cerebral and common carotid arteries. LCpH and LCBF were determined simultaneously by a double-label autoradiographic technique 4 h after vascular occlusion in three groups: no treatment, carrier infused, and a group receiving CGS-19755 at 10 mg/kg bolus immediately after occlusion followed by infusion at 5 mg kg-1 h-1 for 4 h. Compared with rats receiving carrier, several cortical structures on the side of occlusions showed significantly higher CBF in rats receiving CGS-19755. This drug also corrected the pH in several left cortical structures to values significantly higher than in the rats receiving carrier. The correction in LCpH was not limited to those regions showing significant elevations in LCBF. In the nonoccluded hemisphere, CGS-19755 significantly increased the hemispheric mean blood flow from 122 +/- 17 to 221 +/- 64 ml 100 g-1 min-1 (mean +/- SD of all structures, p less than 0.01) without any changes in LCpH. Cortical but not basal ganglia infarct volume was significantly smaller in rats receiving CGS-19755 than in the carrier-treated group. These results suggest that, at least partially, the neuroprotective effect of CGS-19755 in ischemia may be related to changes in CBF and pH in addition to its antagonist effect on the NMDA receptor.

Animals↗
PubMed1991

[Echocardiographic assessment of the effect of aging on the diastolic and systolic functions of the left ventricle].

The effects of aging on the diastolic and systolic functions of the left ventricle were studied by echocardiography as follows. (1). Maximum velocity of circumferential fiber lengthening (negative peak Vcf) and shortening (peak Vcf) was assessed by digital M-mode echocardiography in 20 healthy young subjects and 26 healthy elderly subjects. The mean value of negative peak Vcf (-cir/sec) was -3.87 +/- 0.85 in the 20's. -4.48 +/- 1.14 in the 30's, -3.71 +/- 1.21 in the 40's, -2.70 +/- 0.90 in the 60's, -2.57 +/- 0.64 in the 70's, -2.33 +/- 0.77 in the 80's and -2.57 +/- 0.65 in the 90's showing significant difference among young and elderly groups (p less than 0.05- p less than 0.005). The mean value of peak Vcf showed no significant difference among young and elderly groups except for the group in the 30's which showed significant (p less than 0.05) difference between other groups. (2). Indices of the left ventricular systolic and diastolic functions were calculated by standard M-mode echocardiographic technique in 227 healthy subjects from 5 to 94 years in age by dividing them into 3 young groups and 4 elderly groups. As for the left ventricular internal diameters a tendency of increase was observed in the end diastolic diameter of the left ventricle in accordance with ageing. Fractional shortening of the left ventricular diameter which ranged from 36.2% to 36.7% in the 3 young groups and 36.9 to 40.3% in the 4 elderly groups and cardiac output showed no age dependent decrease.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1991

[Evaluation of clinical usefulness of a rapid quantitative measurement of D dimer (cross-linked fibrin degradation products)].

In order to evaluate precisely the fibrinolytic states in clinical disorders, plasma levels of D dimer (cross-linked fibrin degradation products) were measured by a newly developed, rapid quantitative method based on the latex photometric immunoassay in patients with hematological malignancies, diabetes mellitus, collagen disease, liver disease, thrombotic disease and disseminated intravascular coagulation (DIC). Plasma levels of D dimer were elevated in a variety of diseases, especially in DIC. Patients with hematological malignancies, liver disease and thrombotic disease also had relatively high levels of D dimer. On the whole, D dimer values were positively correlated with plasmin-alpha 2-plasmin inhibitor complex and thrombin-antithrombin III complex. In addition, plasma D dimer was measured during fibrinolytic therapy with urokinase or tissue-type plasminogen activator; its elevation was detected in some patients. These findings indicate that accelerated fibrinolysis is frequently observed in a variety of diseases, and that a rapid quantitative measurement of D dimer would be valuable for the precise assessment of fibrinolysis in these disease states.

Disseminated Intravascular Coagulation↗
PubMed1991

[Five cases of tuberculosis occurring in an accounting office during 5-year period].

Five cases of pulmonary tuberculosis occurred in an accounting office during 5-year period. Patients 1 and 2 were hospitalized in January and March respectively in 1984. Patients 3 and 4 were found to have abnormal shadows in 1987. Patient 5 was admitted to our hospital in July, 1988. Patients 1 and 2 showed a similar pattern of drug resistance. The desk of Patient 3 was located in front of the desk of Patient 1. Retrospective review of chest X-ray film of Patient 3 taken two years before admission revealed that active contagious tuberculosis had been misdiagnosed as inactive type, resulting in delayed treatment. Patients 4 and 5 worked near to Patient 3 for the past two years. PPD skin test was carried out on 47 workers in the same room and other rooms as well. The distribution of maximum diameters of erythema for workers in the same room did not show a bimodal distribution, but the mean diameter (30.6 +/- 16.4 mm) was larger than that (22.3 +/- 17.2 mm) for workers in other rooms. Preventive administration of Isonicotinic acid hydrazide (INH) was made for 10 workers. These observations suggest that routine chest X-ray film should be carefully checked, and PPD skin test should be performed to those at risk of tuberculosis infection.

Accounting↗
PubMed1991

Consumption coagulopathy associated with left atrial thrombosis.

Three patients with consumption coagulopathy due to left atrial thrombosis associated with mitral valve disease are described. They had hypofibrinogenemia (0.7-1.7 g/L), mild thrombocytopenia (104-117 x 10(9)/L), and elevated fibrinos/fibrin degradation products (FDP) (20-64 micrograms/ml). Two patients had bleeding symptoms, and one of these also had two episodes of transient ischemic attack. One without bleeding symptoms had three episodes of transient ischemic attack and repeated retinal vein thrombosis. In two patients, preoperative anticoagulation with either heparin or nafamostat mesilate was followed by an increase in plasma fibrinogen level from 0.7 to 5.6 g/L and a decrease in FDP from 64 to 8 micrograms/ml in one patient, and fibrinogen from 1.0 to 2.8 g/L and FDP from 40 to 5 micrograms/mL in another patient. The mitral valve replacement and thrombectomy were performed uneventfully, and their coagulopathy disappeared thereafter. These three patients had a lower platelet count and a shorter platelet survival time than another three patients with mitral valve disease of a similar severity but without coagulopathy. Hemostatic evaluation should be performed in patients suspected of intracardiac thrombosis.

Disseminated Intravascular Coagulation↗
PubMed1990

Routed protein migration after protein extravasation and water leakage caused by cold injury.

The movement of extravasated endogenous protein induced by cold injury was investigated in the rat. Extravasated proteins were observed around the cold injury immediately after injury; within 3 hr they had moved into the ipsi- and contralateral hemispheres along the nerve fibres (routed protein migration). The water content in the areas where the extravasated protein was observed was increased, and NMR-CT scans (TR 2000 msec, TE 90 msec) showed high intensity patterns whose distribution and progression coincided with those of extravasated protein. NMR relaxation time, T1, showed a slight increase in the area where the extravasated protein was observed, but T2 value did not show any significant changes. In the opposite hemisphere, CBF decreased within 3 to 6 hours after injury. Local cerebral glucose utilization was reduced, but this change occurred more than 6 hours after injury. These results indicate that water leakage and protein extravasation occur simultaneously after the injury without any significant change of water state or protein conformation. Subsequently, a reduction of CBF is induced, which is followed by changes in cerebral metabolism.

Animals↗
PubMed1990

[Echocardiographic assessment of mitral annular calcification in hypertrophic cardiomyopathy with asymmetric septal hypertrophy and healthy elderly cases].

The prevalence and degree of mitral annular calcification (MAC) in elderly cases of hypertrophic cardiomyopathy with asymmetric septal hypertrophy (ASHCM) were studied in comparison with healthy elderly and chronic hypertensive elderly with concentric left ventricular hypertrophy (HT + LVH) by echocardiography. In seven elderly patients with ASHCM (mean age 77.3 +/- 8.1 years) severe MAC was observed in all cases (1 male and 6 females) and systolic anterior motion of the mitral valve (SAM) was present in 3 cases, incomplete in 2 and absent in 2 cases. Of 57 healthy elderly with a mean age of 78.8 +/- 8.8 years, 8 subjects (1 male and 7 females, 14%) showed MAC. The prevalence of MAC was 0% in the sixties, 14% in the seventies, 16% in the eighties and 29% in the nineties. MAC was severe in four subjects above eighty years old. In 3 cases with HT + LVH with a mean age of 72.3 +/- 4.7 years no MAC was observed and SAM was present in one, partially observed in one and absent in one case, respectively. Serum calcium (Ca) and phosphorus (P), reported to be related with the formation of MAC, and fasting blood sugar level (FBS) were evaluated. In healthy elderly with MAC, serum Ca was 8.78 +/- 0.46 mg/dl, P 3.55 +/- 0.37 mg/dl and FBS 97.75 +/- 29.01 mg/dl, P 3.55 +/- 0.37 mg/dl and FBS 97.75 +/- 29.01 mg/dl.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1990

[Spinal subarachnoid hemorrhage due to spinal ependymoma presenting findings mimicking subacute meningitis].

A case of spinal ependymoma showing spinal subarachnoid hemorrhage with findings mimicking subacute meningitis is reported. A 33-year-old man was admitted to our hospital because of headache, low back pain and low grade fever on June 8, 1982. Ten years ago he had experienced an episode of abrupt onset lumbago and headache. Subarachnoid hemorrhage was suspected because of bloody cerebrospinal fluid, but cerebral angiography failed to demonstrate any abnormalities. On admission physical examination revealed nuchal rigidity, Kernig's sign and percussion tenderness on 5th lumbar spine. Lumbar puncture showed bloody cerebrospinal fluid. Cell counts were 217 per cubic millimeter (neutrophil: lymphocyte = 27.73), protein was 396 mg/dl and sugar level was 18 mg/dl. Myelography showed an intradural extramedullary tumor at the spinal level of L1-L2. Spinal MRI and CT scan also demonstrated a spinal tumor at the same level. Laminectomy and total resection of the spinal tumor were performed and a diagnosis of myxopapillary ependymoma was made histologically. He was discharged about a month later without any neurological deficits. The development of subarachnoid hemorrhage due to spinal tumor is rare. There are about 50 cases of spinal subarachnoid hemorrhage due to spinal tumor in the literature, including three cases in Japan. Two cases presenting CSF findings mimicking bacterial meningitis have been reported in the literature, but there is no report of subarachnoid hemorrhage due to spinal tumor that presents findings mimicking subacute meningitis similar to our case. From these results, it is suggested that subarachnoid hemorrhage due to spinal ependymoma may reveal various CSF findings. In cases suggesting bacterial or subacute meningitis with bloody CSF and acute onset, the possibility of spinal subarachnoid hemorrhage due to rupture of a spinal tumor, especially ependymoma, should be considered.

Adult↗
PubMed1989

Plasmin-a2-plasmin inhibitor complex in plasma of patients with thromboembolic diseases.

Plasmin generation in vivo was assessed by measuring plasma levels of plasmin-a2-plasmin inhibitor complex (PAP) with an ELISA in 42 patients with arterial or venous thromboembolic diseases. Plasma concentration of PAP was markedly elevated in patients with venous thromboembolic diseases during acute illness (3.32 +/- 3.71 ug/ml, mean +/- SD) as compared to healthy subjects (0.24 +/- 0.13 ug/ml, n = 14), while it was nearly normal (0.30 +/- 0.13 ug/ml) in patients with venous thromboembolic diseases in chronic stage. Patients with arterial thromboembolism had modestly elevated PAP; 1.05 +/- 0.77 ug/ml during acute episode, and 0.84 +/- 0.40 ug/ml in chronic stage. These results indicate that excessive activation of fibrinolytic system (plasmin generation in vivo) occurs actually in many patients with thrombotic diseases, especially in venous thromboembolic diseases during acute illness.

Acute Disease↗
PubMed1988

Plasmin-alpha 2-plasmin inhibitor complex in plasma of patients with disseminated intravascular coagulation.

Plasmin-alpha 2-plasmin inhibitor (alpha 2PI) complex, an indicator of in vivo plasmin generation, was measured in the plasma of 48 patients with disseminated intravascular coagulation (DIC), by enzyme-linked immunosorbent assay (ELISA). Plasmin-alpha 2PI complex was markedly elevated to 7.9 +/- 4.26 mg/liter (mean +/- SD) in DIC at presentation, with normal values at less than 0.8 mg/liter. The concentration of plasmin-alpha 2PI complex changed in parallel with the course of DIC and decreased to 1.9 +/- 1.49 mg/liter (n = 28) in remission. Among various underlying disorders, DIC, in patients with acute promyelocytic leukemia, had the highest complex levels (mean 10.8 mg/liter), and septic patients had the lowest levels (mean 3.4 mg/liter). No significant correlation was found between FDP and plasmin-alpha 2PI complex. These results indicate that the quantitative assay of plasmin-alpha 2PI complex in plasma would be valuable in the assessment of hyperfibrinolysis in DIC.

Acute Disease↗
PubMed1979

A mode of incipient growth in chemically induced signet ring cell carcinoma of the canine stomach.

A 31-month-old female mongrel dog was orally administered with 50 mg or 100 mg of N-nitrosobutylurea (NBU) in gelatin-capsule 3 times per week for 19 months with interposing periods of complete suspension. Thirty-four foci of signet ring cell carcinoma were found in the antral region of the stomach. The majority of the foci (31 foci) were early cancer, and the remaining foci were invasive cancer. In addition to these lesions, there was "a single gland cancer" in which a row of cancer cells was confined to a single gland. The whole gland was composed of two cell layers; the inner layer facing the lumen was normal gastric cells and the outer layer was atypical or neoplastic cells underlaid by the basement membrane. Mitosis was frequently observed on the bottom of the gland. Atypical or neoplastic cells seemed to mature gradually through a process of upward migration with increase in cytoplasmic Alcian blue-PAS and HID-AB positive mucin. Some of the cells rich in mucin moved into the lamina propria. The other cells remained in the flow of the regular cell renewal system of the normal gastric cells and reached the top of the gland. This observation revealed a mode of incipient gastric cancer growth, which starts and spreads within a single gland, before it invades the surrounding lamina propria.

Adenocarcinoma, Mucinous↗