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Biomedical subjects

N Honda

Publications and source records attributed to N Honda.

At least 19 recordsLinked to original sources
PubMed1992

[Two-dimensional time-of-flight MR angiography of mediastinum and pulmonary hilar vessels: initial clinical experiences].

Two-dimensional time-of-flight magnetic resonance angiography (2D TOF MRA) of mediastinal and pulmonary hilar vessels was performed in 10 patients, seven men and three women with a mean age (range) of 65.7 (48-88) years. The rate of visualization of the vessels and the diagnostic ability of 2D TOF MRA were assessed in comparison with contrast-enhanced CT. A radiofrequency-spoiled gradient echo sequence (SPGR) was used during repeated breath-holding (8-27 seconds) in coronal (8 patients) and axial (2 patients) imaging planes on a 1.5 Tesla superconducting scanner under the following conditions: repetition time/echo time/flip angle/excitation: 25-33/7-8 ms/45 degrees/1, field-of-view: 30 x 30 cm, slice thickness: 2.5 mm, 32 slices, 256 (frequency) x 192 (phase) matrix, with gradient moment nulling technique. Visualization sufficient to enable diagnosis of the vascular lesion was obtained in 95 (52%) vessels, mere visualization in 63 (35%), and non-visualization in 24 (13%) of the 182 evaluable vessels. The rates of good visualization of pulmonary hilar vessels (26/86, 30%) and veins (26/48, 54%) were significantly lower than that of arteries (43/48, 90%, p < 0.05). The sensitivity and specificity of 2D TOF MRA were 77% (10/13) and 100% (83/83), respectively, in 96 evaluable vessels of nine patients. 2D TOF MRA of mediastium and pulmonary hili is clinically feasible, and may be useful because of its high specificity.

Aged↗
PubMed1992

Intraglomerular fibronectin in rat experimental glomerulonephritis.

To clarify the mechanisms of glomerular pericapillary fibronectin deposition in human membranous nephropathy and mesangial proliferative glomerulonephritis, intraglomerular fibronectin distribution was examined by light and electron microscopy using the experimental rat models of Heymann and nephrotoxic serum nephritis. As previously demonstrated by immunofluorescence microscopy (Pettersson and Colvin 1978; Ikeya et al. 1985, 1986), fibronectin was distributed in the mesangial areas and occasionally on percicapillary walls of normal glomeruli, while in nephrotoxic serum nephritis and Heymann nephritis, fibronectin was diffusely located along glomerular capillary walls as well as in the mesangium. By immunoelectron microscopy using the immunogold technique, fibronectin was also noted in the mesangial areas and the lamina densa of the glomerular basement membrane (GBM) in normal glomeruli. In nephrotoxic serum nephritis, fibronectin was seen around mesangial cells situated between endothelial cells and the GBM, suggesting that pericapillary fibronectin in nephrotoxic serum nephritis reflects mesangial extension. However, in Heymann nephritis, it was found uniformly in the lamina rara interna, lamina densa and lamina rara externa of the GBM, indicating no specific relation to glomerular cells. When sections of normal and both experimental nephritis kidneys were incubated with fluorescein isothiocyanate conjugated with rat plasma fibronectin, a linear pattern of fluorescein staining along the glomerular capillary walls was observed in Heymann nephritis but not in normal or nephrotoxic serum nephritic rats. The GBM in Heymann nephritis would thus appear to have an affinity for plasma fibronectin. Based on the above findings, fibronectin in the GBM of rats with Heymann nephritis may reasonably be concluded to originate from the plasma.

Animals↗
PubMed1992

Basic study on the effect of nasally administered salmon calcitonin preparation on the nasal ciliary epithelium.

Nasal administration of drugs is an administration method which is worthy of attention. In such therapy, local administration should not damage the nasal mucous membranes. In the present study, we conducted an investigation by the tissue culture test method of the functional and morphological effects of new nasal calcitonin preparation, which is being developed as a nasal spray agent for osteoporosis, on the nasal ciliary epithelium. The nasal septal mucous membranes of C3H-strain mice were used, and 5 types of nasal calcitonin preparations with a microcrystalline cellulose base and additives added were used. The various drugs were added to nasal mucous membrane slices in RPMI-1640 culture medium; ciliary activity before addition and 0.5, 2, and 4 hr after was electrophotometrically measured; and morphological observation was then carried out by SEM. In the various additive groups, virtually no effect on ciliary activity was observed, and the same results were obtained when 3 and 9 times the estimated clinical spray dosage was added. Moreover, in morphological observation by SEM, in the various additive groups, no morphological changes in samples of nasal ciliary specimens were observed after 4 hr of culturing at the maximum administered dosage (9 times the estimated clinical spray dosage). Based on these findings, it was concluded that the series of calcitonin preparations with various additives had no hazardous effect on the nasal ciliary epithelium.

Administration, Intranasal↗
PubMed1992

Value of three-dimensional surface display of brain perfusion imaging. Comparison with tomographic imaging.

The diagnostic ability of a three-dimensional surface display of I-123 IMP brain scintigrams and tomographic images was compared in 12 patients who underwent I-123 brain tomography for cerebral cortical hypoperfusion. Foci of decreased accumulation were independently diagnosed by four radiologists, first with transaxial images, second with three-dimensional images, and finally with both images subjectively compared for the purpose of diagnosing the existence, localization, and extent of lesions. Six different lesions (0 to 3 lesions/radiologist) were found only on the transaxial images, but 30 different lesions (1 to 14 lesions/radiologist) were found on the three-dimensional images. In 9 out of 12 cases, the three-dimensional images were regarded as superior for evaluating the extension of the lesion and for lesion existence and lesion localization in 5 out of 12 (P less than 0.05). In conclusion, a three-dimensional display of an I-123 IMP brain tomogram is superior to tomographic images in diagnosing the extent of cerebral cortical hypoperfusion. However, the display is not superior to tomographic images for diagnosing the existence and localization of hypoperfusion.

Amphetamines↗
PubMed1992

Effects of desoxycorticosterone acetate (DOCA) plus saline drinking on gentamicin-mediated nephropathy in rats.

Studies were performed to examine the effect of desoxycorticosterone acetate (DOCA) treatment plus isotonic saline drinking on gentamicin (GM)-mediated nephropathy in rats. GM, 40 mg/kg/day, was subcutaneously injected for 13 days following a 5-week treatment with water drinking or DOCA (10 mg/kg/week) plus saline drinking. Twenty-four hours after the last injection of GM, renal blood flow (RBF) and Cin decreased to approximately 69% and 52% of the control values in water-drinking GM-treated rats, respectively, but was well maintained in DOCA plus saline-drinking GM-treated animals. There was no significant difference in morphologic tubular injury or the renal cortical GM content between GM-treated groups. Saline drinking alone (1% saline, 5 weeks) lessened neither GM-induced reduction in GFR nor tubular damage. Body weight loss occurred following GM injection in the water-drinking group but not in the DOCA plus saline-drinking and saline-drinking-alone groups. DOCA plus saline drinking significantly suppressed the plasma renin activity (PRA) but saline drinking alone did not. A significant inverse correlation was found between PRA and Cin in water-drinking GM-treated and untreated rats. The data suggest that the beneficial effect of DOCA plus saline drinking is associated with renin-angiotensin suppression rather than with the renal GM content or well-maintained hydration.

Acute Kidney Injury↗
PubMed1992

Factors affecting severity of renal injury and recovery of function in acute renal failure.

Severity of renal injury and recovery of function in acute renal failure (ARF) are strongly related not only to the magnitude and nature of ARF insult but also to numerous factors in the host which govern renal susceptibility to the insult and repair of renal lesion. Prior ARF affords resistance to a rechallenge with the same or different ARF insult. The mechanisms for this acquired resistance to ARF have not been well established, but suggested mechanisms include (a) increased resistance of regenerated tubular epithelial cells to a rechallenge, (b) glomerular refractoriness to vasoactive substances, (c) failure of damaged kidney to concentrate the toxic substance, (d) enhanced antioxidant enzyme activity in glomeruli, and (e) increased Na(+)-K(+)-ATPase activity in regenerated tubular epithelial cells. Controversy still exists regarding roles of these factors in the resistance to renal failure. Functional and morphologic recovery of postischemic kidney is enhanced by antecedent unilateral nephrectomy but delayed in the presence of the contralateral kidney. The mechanisms for the effect of uninephrectomy remain unsettled. Recent studies suggest contributions of changes in preglomerular vascular resistance; alterations in the environment which follow ischemia to all functioning excretory renal tissues; and altered production and release of vasoactive substances such as angiotensin, endothelin, thromboxane, and atrial natriuretic peptide.

Acute Kidney Injury↗
PubMed1992

[Annual changes of bacteria isolated from urinary tract infections and their susceptibility to new quinolone agents].

Statistical analyses were conducted on bacterial strains isolated from the urine of patients with urinary tract infections (UTI) in the Department of Urology at Aichi Medical University from January 1988 through December 1991. The drug sensitivity of the bacterial strains isolated from patients with complicated UTI between 1988 and 1991 was analyzed and compared. Among the outpatients with uncomplicated UTI, a total of 352 strains were isolated. E. coli was isolated the most frequently (90.1%). Among the outpatients with complicated UTI, a total of 829 strains were isolated. Enterococcus sp. was isolated the most frequently (21.2%). P. aeruginosa and S. aureus showed a tendency to increase. Among the inpatients with complicated UTI, a total of 671 strains were isolated. Enterococcus sp. was isolated the most frequently (22.5%). P. aeruginosa and S. aureus showed a tendency to increase, while E. coli and Enterobacter sp. showed a tendency to decrease. E. coli was highly sensitive to all drugs except ampicillin (ABPC). Proteus sp. and Klebsiella sp. were highly sensitive to norfloxacin (NFLX). P. aeruginosa was highly sensitive to gentamicin (GM). The frequency of NFLX-sensitive P. aeruginosa significantly dropped from 84.6% to 40.9% among the outpatients (P < 0.01), and from 75.0% to 44.4% among inpatients (P < 0.05). S. aureus was highly sensitive only to minocycline (MINO). The frequency of NFLX-sensitive S. aureus significantly dropped from 66.6% to 23.3% among inpatients (P < 0.05). Enterococcus sp. was highly sensitive to ABPC and MINO. Of the new quinolones, tosufloxacin (TFLX) had the strongest antimicrobial activity followed by (ciprofloxacin) CPFX on all the bacterial strains tested.

Bacteria↗
PubMed1992

Roles of hormones in plasma potassium alteration in acute respiratory acidosis in dogs.

The present study was conducted to examine the roles of hormonal factors in plasma potassium alterations in acute respiratory acidosis. Respiratory acidosis (pH, 7.07-7.10) induced by the inhalation of 10% CO2, 20% O2 and 70% N2 mixed gas caused an increase in the plasma potassium concentration beyond that of the control of 3.44 +/- 0.12 (mean +/- SE) to 4.36 +/- 0.07 mEq/l (p less than 0.01) within 180 min. The plasma norepinephrine concentration was also noted to significantly increase at the same time. Phentolamine (40 micrograms/kg/min i.v.) did not affect the degree of acidosis or acidosis-induced hyperkalemia. No significant changes in the plasma levels of epinephrine, insulin, glucagon, cortisol or aldosterone could be detected. Hormonal factors would thus appear not to be essential to potassium movement from intracellular to extracellular compartments in acute respiratory acidosis.

Acidosis, Respiratory↗
PubMed1992

[A comparison of the effects of omeprazole with those of ranitidine on intragastric pH and volume in patients for elective surgeries].

This study compared the effect of omeprazole with those of ranitidine on intragastric secretion during perioperative period. Thirty-one patients were randomly allocated to three groups. Each group received either omeprazole, ranitidine orally or one on the night before surgery. Intragastric pH and volume were measured after induction of anesthesia. Omeprazole group and ranitidine group had a higher mean pH than control group (P less than 0.01). None of the omeprazole group had an aspirate of pH lower than 2.5. One patient (10%) in the ranitidine group and five patients (50%) in the control group and five patients (50%) in the control group had aspirates of pH lower than 2.5. Mean gastric volume was not significantly different among these groups. A single dose of omeprazole 20 mg significantly decreased the number of patients at risk of aspiration pneumonitis.

Gastric Acid↗
PubMed1992

[A case of meningioma with non-accumulation of 99mTc-ECD and increased accumulation of 99mTc-HMPAO in the tumor].

99mTc-ECD SPECT and 99mTc-HMPAO SPECT with or without Matas test were performed in a 62-year-old woman with meningioma in the left anterior cranial fossa. After injection of 740 MBq 99mTc-ECD or HMPAO, 64 projection images were collected with a rotating Gamma camera. Matas test was carried out by compressing the left common carotid artery for about one minute immediately after RI injection. Although 99mTc-ECD SPECT showed non-accumulation in the tumor, 99mTc-HMPAO SPECT demonstrated increased accumulation in it. This area of increased accumulation disappeared on 99mTc-HMPAO SPECT with Matas test which causes decrease in blood flow of the tumor. These findings suggest 99mTc-ECD and 99mTc-HMPAO have a different mechanisms of accumulation in the meningioma.

Cysteine↗
PubMed1992

[Coagulation changes during liver resection].

Thrombin-antithrombin III complex (TAT) and plasminogen activator inhibitor (PAI) were measured during liver resection surgery in 8 patients. TAT and PAI activities of patients under liver resection were compared with those of 11 patients under resection of esophageal carcinoma. TAT activity increased during liver resection (P < 0.001) and reached 14 times (P < 0.001) of its control value in the recovery room. PAI activity was very stable during operation, but increased to twice (P < 0.01) of its control value in the recovery room. TAT activity of patients after liver surgery in the recovery room was (P < 0.05) more than twice of that of patients after esophageal surgery. We conclude that hypercoagulable state occurred during liver resection to a greater degree compared with that observed with esophageal surgery, and that its cause might be liver resection itself.

Antithrombin III↗
PubMed1992

[Effects of sevoflurane and isoflurane on intraocular pressure in adult patients].

We investigated effects of two anesthetic agents, sevoflurane and isoflurane, on intraocular pressure (IOP). Forty adult patients were allocated randomly to two groups; Group S (sevoflurane) or Group I (isoflurane). All patients were given a bolus of thiamylal (4-5 mg.kg-1) and vecuronium (0.1-0.2 mg.kg-1) and maintained with 1-3% sevoflurane or isoflurane supplemented with nitrous oxide. Ventilation was controlled and ETCO2 was monitored. IOP, blood pressure and heart rate were measured before induction of anesthesia (control) and at the 7 points of 5, 10, 15, 30, 45, 60 and 120 minutes after intubation. In Group S, IOP was reduced significantly until 30 min compared with control IOP and the maximum decrease was 40% at 10 min. In Group I, IOP was consistently lower than control and the maximum decrease was 40% at the same time as in Group S. But there were no significant differences between the two groups at each point. It seems that the remarkable reductions of IOP after inductions are mainly caused by induction agents. In both groups, hemodynamic parameters showed no remarkable changes during maintenance. These results suggest that both sevoflurane and isoflurane are useful anesthetics for elderly patients receiving ophthalmic surgeries.

Adult↗
PubMed1992

[Hemodynamic management of LOS using prolonged VA bypass circulatory assist].

The authors managed five LOS patients using prolonged V-A bypass circulatory assist. Maximum CVP values were under 12 mmHg in three survivors, and 17 mmHg and 20 mmHg in two nonsurvivors. Maximum PCWP values were under 14 mmHg in survivors, and 19 mmHg and 20 mmHg in nonsurvivors. Dopamine was administrated in all cases and norepinephrine was administrated at a rate of less than 0.3 microgram.kg-1.min-1 in survivors, and in two nonsurvivors, norepinephrine was used at a rate of 0.36 and 1.2 micrograms.kg-1.min-1. Before and after disconnection of V-A bypass, the bypass flow of the three survivors were under 1.0 l.min-1 just before disconnection, and immediately after it, the preload did not increase, and the dose of administrated catecholamine increased. V-A bypass time intervals of the three survivors were 71, 42 and 87 hours, and those of the two nonsurvivors were 71 and 43 hours. Maximum bypass flow rate was above 40ml.kg-1.min-1 in four of five patients. The authors discussed the management of the patients' heart and of the V-A bypass machine during the prolonged V-A bypass circulatory assist.

Aged↗
PubMed1992

[Heat conservation during abdominal surgery].

Intraoperative hypothermia is a major problem in anesthetic management. We compared the heat conserving effect of a forced air warming system (Bair Hugger, Augustine Medical Inc.) with that of a warming blanket. Sixteen patients undergoing abdominal surgery were studied. Patients were anesthetized with nitrous oxide and oxygen combined with epidural anesthesia. Patients received tympanic, rectal, bladder and core temperature monitorings. Patients were divided randomly to Bair Hugger group (BH, n = 8) or warming blanket group (WB, n = 8). Temperature were measured every one hour over three hours. The BH group showed significantly higher temperatures than WB group. Bair Hugger system is an efficient way to maintain intraoperative body temperature.

Abdomen↗
PubMed1992

[Influence of calcium channel blockers and beta-blockers on pain relief with iontophoresis].

We studied usefulness of iontophoresis on pain relief using several Ca channel blockers, propranolol and guanethidine. Subjects were 18 healthy adult volunteers. We used 4% lidocaine with/without several drugs (2 mg of nicardipine, verapamil, diltiazem, propranolol and 10mg of guanethidine), and evaluated the pain relief effect with Nakahama's algesimeter. In all groups except for propranolol group, the pain recognition time was elongated significantly in comparison with control. In making comparison between each Ca channel blocker, we did not observe any significant differences, but, in propranolol group, elongation of pain threshold time was observed in some subjects. During these processes, systemic blood pressure and heart rate showed no remarkable changes. Our results suggest that it is possible to achieve more prolonged analgesic effect by the Ca channel blockers.

Adult↗