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Biomedical subjects

S Kadoya

Publications and source records attributed to S Kadoya.

At least 73 records · Page 4Linked to original sources
PubMed1982

[Factors affecting prognosis of thalamic hemorrhage (author's transl)].

The present study deals with the factors affecting the prognosis in the acute stage of 29 cases with hypertensive thalamic hemorrhage diagnosed by CT scan. It was thought that the following factors were significantly related to the outcome of the patients who were unable to lead daily life, remained in vegetative state or died. (1) Consciousness level was below 10 in the so-called 3-3-9 formula. (2) Bilateral Babinski's signs was observed. (3) Localization of the hematoma was all the thalamic nuclei type. (4) Hematoma volume was above 10 ml. (5) As for the size of hematoma, the maximum dimension of hematoma was over 30 or 35 mm, maximum width over 30 mm, maximum length over 25 mm and maximum height over 30 or 40 mm. (6) Ventricles were dilatated. It was seemed that the prognosis had no significant relationship with the age of the patients, the difference between left and right side of hematoma, with the presence or the absence of ventricular penetration of hematoma, and with the existence of midline shift. We thought that in the acute stage of hypertensive thalamic hemorrhage of the prognosis could be forecasted by neurological findings, accurate calculation of the hematoma volume and size, localization of hematoma and presence or absence of ventricular dilatation by CT scan.

Adult↗
PubMed1982

[Four cases of hangman's fracture].

Four cases of hangman's fracture were reported. The cases were disturbed between 67 and 85 years of age and all were males. The exact mechanisms of injuries of these cases were not precisely documented, but all struck the head by falling for some distance. Three of them showed cerebral concussion immediately after injuries. One of four patients had complete transverse cord lesion at C5 level and the other showed right Brown-Séquard syndrome at C4 level, while another two showed no neurological deficits except for neck pain. Radiological findings disclosed fracture of the pedicles or the lamina of the axis and anterior spondylolisthesis of the axis upon the third cervical vertebra. In one patient, fracture of the body of third cervical vertebra was combined. All cases were initially treated by skeletal traction, in order for reduction of dislocation, then fixation of the injured spine. Steroid and mannitol were administered to patients with complete cord section and Brown-Séquard type of lesion. Two out of four patients showed uneventful clinical course. A patient shown Brown-Séquard syndrome revealed fairly good recovery, and another with showing transverse cord lesion died from fatal gastrointestinal bleeding 15 days after injury. Analysis of C2 fractures experienced in these four cases suggested that direct downward forces along the longitudinal axis when the head remained in extension or flexion caused these fractures, whereas pure hyperextension injures of the upper cervical spine, which has been considered as main mechanism, had only a minor role.

Aged↗
PubMed1982

[An operative procedure of anterior osteophytectomy with interbody fusion].

Surgical anatomy of an anterior approach to the cervical spine, together with osteophytectomy for cervical spondylotic radiculomyelopathy, was described. Recognition of fascial compartments is important to avoid unnecessary injuries to the vital structures such as oesophagus, trachea, carotid artery and recurrent nerve. Detailed operative procedures of microsurgical osteophytectomy removing all the compressing components against the cervical cord and radicula was also described. Biomechanics of the cervical spine must be borne in mind beforehand when cervical spine operation is considered.

Cervical Vertebrae↗
PubMed1981

[Measurement volume of intracranial hematoma by computed tomography (author's transl)].

On hypertensive intracranial hematoma, the hematoma volume on CT scan was measured by Delta scan 50 with MAP-program. 1) In each slice of the hematoma, high density mass lesion, the area was measured by joy stick on viewing console, and relationship with print out data, area above 40 CT values was good. 2) Correction of partial volume effect, especially of high of hematoma in the 10 mm scan slice was done with each mean CT values of the hematoma, and central CT values of that. For correction of partial volume effect, hematoma volume was decreased compared with the volume measured by MAP area measurement only, but in phantom study, corrective hematoma volume has shown high accuracy. 3) In comparison of corrective hematoma volume with maximum length of hematoma, line measurement does not evaluate of hematoma volume proportionaly as large. Though calculated volume by modified Dodge's formula (pi/6 X L X S X slice) has shown good relationship with corrective hematoma volume. Then, in clinical use, measurement of 3 line distance, maximum length, crossed short length, slice thickness contained hematoma was recommended to evaluate actual hematoma volume.

Cerebral Hemorrhage↗
PubMed1979

[Ossification of the posterior longitudinal spinal ligament--comparative studies with computerized tomography (author's transl)].

Ossification of the posterior longitudinal spinal ligament (OPLL) was characterized by calcified longitudinal band along the posterior margin of vertebrae, but it has not been possible to know how the cord is compressed within the narrowed spinal canal. Our neuroradiological studies based on CT-view of the 15 cases of OPLL suffering from various degree of myelopathy revealed: 1) Computed tomography precisely delineated shape of OPLL, which was quite polymorphic, like mushroom, irregular cubic and round. OPLL ranged more than two vertebrae was not uniform, but exhibited different configuration at each level. 2) OPLL at lower cervical and higher thoracic regions was difficult to diagnose by conventional lateral roentgenograms, but CT-scan demonstrated clearly whole extent of OPLL. 3) obliteration ratio of the affected spinal canal was calculated on CT-scan. Cases showing severe myelopathy, such as quadriparesis and neurogenic bladder, presented spinal canal stenosis of more than 30%. Spondylosis were concomittant roentgenographic findings on 13 cases of OPLL (87%). However, spondylotic changes responsible to the myelopathy were seen on only three cases. In these case, the obliteration ratio by ossificated ligament was lower than 26%. On conclusion, computed tomographic views of OPLL gave us more detailed information about the stenotic spinal canal and found to be essential examination when considering operative intervention.

Aged↗
PubMed1978

Neuroradiology of ossification of the posterior longitudinal spinal ligament. Comparative studies with computer tomography.

Comparative neuroradiologic studies of the posterior longitudinal spinal ligament were performed in 15 cases showing myelopathy. On visualizing the ossified foci CT scan was found to be superior to the conventional roentgenograms, and detailed evaluation of the constricted spinal canal with related neurologic deficits became possible. CT analysis must be performed to differentiate spondylotic myelopathy, which is essential when considering operative intervention.

Humans↗