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Biomedical subjects

K Taguchi

Publications and source records attributed to K Taguchi.

At least 325 records · Page 18Linked to original sources
PubMed1980

Subjective visual symptoms and electroencephalographic analysis before and after removal of occipital falx meningioma.

A 41-year-old patient underwent surgery for the partial removal of a posterior falx meningioma, which invaded deeply into both occipital lobes. After surgery, the patient complained of marked metamorphopsia, colored photopsia, afterimage and loss of stereopsia. The relationships between these symptoms and features of the VEP and EEG power spectra (both under resting and photic driving conditions) were investigated. Marked photopsia on the 4th postoperative day was accompanied by EEG features indicating asynchronous excitation of injured cortical cells, while the presence of a strong afterimage on days 17 through 24 coincided with indications of an apparent refractoriness in cortical activation.

Adult↗
PubMed1980

Effects of optokinetic stimulation on the center of gravity during standing.

The effects of horizontal as well as vertical optokinetic stimuli on the body's center of gravity in normal adults were investigated by using Jungtype optokinetic stimulator, a straingage platform and a minicomputer. The following results were obtained. With increasing speed of the optokinetic stimulation, the total length of the center of gravity gradually increased up to 60 deg/sec and then decreased. Meanwhile there was a standard two-phasic course in the position of the center of gravity. The ratio of the anteroposterior component to the lateral component in the movement of the center of gravity was below 1.00 in horizontal optokinetic stimulation, while in vertical stimulation it was over 1.00 and showed the maximum deviation of the position at about 60 deg/sec of optokinetic stimulation. The frequency spectra of the movement of the center of gravity showed some peaks at around 0.3 Hz and 1.0 Hz during optokinetic stimulation. The averaged divisional frequencies were calculated to show the change in the frequency spectra in digital values.

Adolescent↗
PubMed1980

Malignant fibrous histiocytoma of the maxillary sinus.

A case of malignant fibrous histiocytoma arising primarily in the left maxillary sinus is described. The patient, a 39-year-old male, who had suffered from sinusitis for 20 years, began to have paresthesia or sharp pain of the left side of the face and toothaches of the left maxilla. At operation a white fibrous tumor developing extensively from the lateral wall to the upper and medial walls of the left maxillary sinus and into the ethmoidal sinus was noted. Following a gradual progression of dyspnea, he died approximately one year after the onset in spite of radiation therapy and anticancer chemotherapy. An autopsy revealed recurrence of the tumor in the left maxillary sinus with wide-spread metastases to the lungs, pleurae, pancreas, kidneys and bone marrows. The direct cause of death was respiratory failure due to extensive growths of the pulmonary and pleural metastases.

Adult↗
PubMed1980

Relationship between the head's and the body's center of gravity during normal standing.

An apparatus for the recording of head movements has been developed and a basic study was performed to determine the normal values of head movement and to estimate the significance of the head movement as a righting reflex. The locus traced by the head closely resembled that of the center of gravity, though shorter in overall length. The head also moves more slowly than the center of gravity. The phase delay of its movement was observed during standing with eyes closed. These results suggest that the head's movement is controlled by the body's center of gravity and that the latter moves in order to keep the head steady, maintaining the eyes in normal position.

Adolescent↗
PubMed1979

Factors influencing survival and successful weaning from clinical ventricular bypass with local heparinization and blood filtration: an analysis in 21 consecutive patients.

A simple circulatory support of transapical ventricular bypass type with nonpulsatile pumping and regional heparinization in 21 patients has revealed that several factors contribute to the patient's outcome. The duration of the bypass was not an essential determinant of prognosis and patients supported for 5--8 days could be weaned from TALVB. Those patients who could maintain steady hemodynamics with flow rates of 30--40% of cardiac output, were usually successfully weaned. Patients who required longer support with high flow rates (60--80% or over) had less probability of being weaned. Persistent or preexistent dysfunction of vital organs, as manifested by renal failure, brain damage, respiratory failure and infection, were main factors determining unsuccessful weaning. The complications related to pumping itself, thromboembolization, bleeding, infection and blood damage, were much less frequently observed with this type of support. The simplicity and less time consuming surgical technique for cannulation and, in addition, less harmful procedure of decannulation and avoidance of thrombus formation were directly related to the improved prognosis.

Adolescent↗
PubMed1979

Central fibrosarcoma of bone. Report of a case.

A case of a 46-year-old Japanese male having fibrosarcoma of bone is reported. The tumor developed in the proximal metaphysis of the left femur. During the three years following onset of the disease with symptoms of local pain and mass, the patient was operated on three times (curettage and bone graft, curettage and bone graft with Jwett's nail fixation and disarticulation). The tumor was found to be an intraosseous translucent lesion on x-ray examiation. Histologically, the tumor consisted of compact or loose, atypical spindle cells, producing abundant collagen-fibers without any osteoid, bony or cartilage formation. From the clinical and pathological findings, this case is thought to be a typical central fibrosarcoma of bone.

Femoral Neoplasms↗
PubMed1979

Characteristics of body sway in patients with peripheral vestibular disorders.

Measuring the movement of the body's center of gravity during standing with the eyes open and with the eyes closed, proved to be a useful test in vestibular investigation. 30 patients with peripheral vestibular disorders were tested using a static sensonograph and a digital computer. Three types of locus patterns, the lateral deviation of the averaged position and two types of frequency spectral patterns obtained from the movement of the center of gravity were the characteristics of the body sway in the patients with peripheral vestibular disorders.

Humans↗
PubMed1979

[Pharmacological studies on Zingiber mioga (ZM) (1). General pharmacological effects of water extracts (author's transl)].

In the central nervous system, ZM decreased locomotor activity and potentiated hypnosis of hexobarbital-Na in mice. ZM had little hypothermic action and there were no anticonvulsive effects on chemoconvulsion and electroconvulsion shock. ZM, 3 mg/kg i.v. produced a sleep-like pattern in the spontaneous EEG activity of cat; from 20 to 30 min. after injection, spindle burst-like waves (12-13 Hz) appeared in the cortex and subcortex. These EEG activities were antagonized by atropine sulfate. In the respiratory and cardiovascular system, ZM, 1 mg/kg or over produced a fall in blood pressure and stimulated respiration in dogs. This hypotensive action was antagonized by atropine sulfate and diphenhydramine hydrochloride, and tachyphylaxis was observed in blood pressure. This compound inhibited cardiomotility in isolated toad heart, had little effect on peripheral blood flow, and produced contractions of isolated guinea pig ileum which were inhibited by atropine by sulfate. Regarding inflammatory response, ZM showed inhibitory effects on the acute edema induced serotonin and dextran. These results indicate that water extracts of ZM have cholinergic actions and in peripheral tissues, histaminergic-like actions.

Animals↗
PubMed1979

[Pharmacological studies on Zingiber Mioga (2). Effects of water extracts on the central nervous system (author's transl)].

Effects on the cat central nervous system of water extracts of Zingiber Mioga (ZM) were studied by electroencephalography (EEG). ZM had little effect on the EEG arousal response to electrical stimulation of mid-brain reticular formation. ZM (3 approximately 5 mg/kg, i.v.) suppressed the recruiting response and the augmenting response recorded from the posterior sigmoid gyrus, respectively. ZM (1 approximately 3 mg/kg, i.v.) decreased the photic driving response, while 5 mg/kg, i.v., tended to enhance the response. In the chronic experiments, ZM(1 approximately 3 mg/kg, i.v.) induced a drowsy pattern in the cortex and subcortex, and shortened the lasting time of the EEG arousal response to sonic stimulation. After 5 to 10 minutes, behavior showed a drowsy to light sleeping state, and electromyogram recorded from the platysma showed a decreased amplitude and frequency, but, did not have an inhibitory effect on the motor system, (ataxia). ZM (5 mg/kg, i.v.) induced desynchronization in the cortex and subcortex, arousal wave appeared in hippocampus, midbrain reticular formation, nucl. ventralis postero-lateralis and amygdala, and behavior tended toward the awake stage. After 10 minutes, EEG transferred to a drowsy pattern and behavior showed a drowsy to light sleeping state. The animal could be readily awakened by sonic stimulation, at every time. ZM appears to have an inhibitory effect on the central nervous system.

Animals↗