Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1433-0350
    Keywords: Moyamoya disease ; Cerebral blood flow ; Cerebral metabolism ; Re-build-up ; EEG ; Positron CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cerebral blood flow and cerebral metabolic rate of oxygen (CBF and CMRO2) of three cases of childhood moyamoya disease were examined by positron-emission-computed tomography for the purpose of investigating the mechanism of the “re-build-up” phenomenon on EEG. Decrease in both CBF and CMRO2 were observed following hyperventilation. However, dissociation between the decrease in CBF and CMRO2 was also observed. Arterial blood-gas analysis disclosed hypocapnea during hyperventilation and hypoxia following hyperventilation. These results clearly indicate that the re-build-up seen on EEG is the manifestation not only of ischemic hypoxia but also of hypoxic hypoxia characteristically seen in moyamoya disease.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1459
    Keywords: Amyotrophic lateral sclerosis ; Multiple system atrophy X-linked recessive bulbospinal neuronopathy ; Spinal ventral horn cell ; Interneuron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The ventral horn cells of the fourth lumbar segment were morphometrically analysed in six cases of amyotrophic lateral sclerosis (ALS; three common forms and three pseudopolyneuritic forms), six of multiple system atrophy (MSA) with autonomic failure, four of X-linked recessive bulbospinal neuronopathy (X-BSNP), and seven age-matched autopsy cases of non-neurological disorders. In the common form of ALS, large and medium-sized neurons of the medial and lateral nuclei were markedly lost; small neurons in the intermediate zone were slightly diminished but fairly well preserved. In the pseudopolyneuritic form of ALS, marked loss was present in the large and medium-sized neurons, and in the small neurons located in the intermediate zone as well. In the MSA, in contrast to ALS, there was a marked reduction in small neurons in the intermediate zone, and large and medium-sized neurons of the medial and lateral nuclei tended to be preserved. In X-BSNP, large and medium-sized neurons were almost completely lost and small neurons were also markedly depopulated. These findings indicated that the pattern of neuron loss in the ventral horn is distinct among these diseases depending on size, location and function of the ventral horn cell population. These disease-specific patterns of neuron loss suggest a difference in the process of neuronal degeneration of ventral horn cells among the disease examined.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1439-6327
    Keywords: Dynamic exercise ; Cerebral blood flow ; Flow resistance ; Resistance index ; Pulsatility index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral blood volume flow and flow velocity have been reported to increase during dynamic exercise, but whether the two increase in parallel and whether both increases occur as functions of exercise intensity remain unsettled. In this study, blood flow velocity in the common carotid artery was measured using the Doppler ultrasound method in eight healthy male students during graded treadmill exercise. The exercise consisted of stepwise progressive increases and decreases in exercise intensity. The peak intensity corresponded to approximately 85% of maximal oxygen consumption. During this exercise, the heart rate (f c), mean blood pressure (BP) in the brachial artery and mean blood flow velocity (νcc) in the common carotid artery increased as functions of exercise intensity. At the peak exercise intensity, (f c), BP and νcc increased by 134.5%, 20.5% and 51.8% over the control levels before exercise (P 〈 0.01), respectively. The resistance index (RI) and pulsatility index (PI) were determined from the velocity profile and were expected to reflect the distal cerebral blood flow resistance. The RI and PI increased during the graded exercise, but tended to decrease at the highest levels of exercise intensity. As νcc increased with increases in exercise intensity it would be expected that cerebral blood flow would also increase at these higher intensities. It is also suggested that blood flow velocity in the cerebral artery does not proportionately reflect the cerebral blood flow during dynamic exercise, since the cerebral blood flow resistance changes.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1437-2320
    Keywords: Cerebral blood flow ; cerebral embolism ; fibrinolysis ; HM-PAO ; ischemic flow threshold ; SPECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To clarify the indications for local fibrinolytic therapy for acute cerebral embolism, correlation among initial regional cerebral blood flow (rCBF) abnormalities, recanalization timing, and computed tomographic scan (CT) findings two days later were evaluated in 17 cases. All cases included had embolic occlusion of middle cerebral or internal carotid arteries which showed no abnormal findings on initial CT corresponding to the acute events but did show abnormal CBF reduction on initial single photon emission computed tomography (SPECT). Relative rCBF was evaluated as the percentage radioisotope counts in the region of interest (ROI) of the affected side against the corresponding ROI in the unaffected contralateral side. Within 6 hours from onset, there was a tendency towards reversed time dependent tolerance of cortical infarction with residual relative rCBE. Hemorrhagic transformation was observed in one case whose relative rCBF was 35% or less. In 10 patients whose occluded arteries were not recanalized within 6 hours, cortical areas with residual relative rCBF of 70% or more did not develop infarction. In conclusions, a pre-therapeutic rCBF study using SPECT is considered to be mandatory: cases with moderate ischemia involving the cortex with residual relative rCBF of between 35% and 70% may be good candidates for local fibrinolytic therapy.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...