Adult ; Cerebral Infarction ; diagnosis ; diagnostic imaging ; etiology ; Heart Atria ; diagnostic imaging ; pathology ; Humans ; Magnetic Resonance Imaging ; Male ; Myxoma ; complications ; diagnostic imaging

Cerebral Infarction ; complications ; Cerebral Veins ; pathology ; Humans ; Thrombosis ; Venous Thrombosis ; etiology

Acupuncture Therapy ; Aged ; Aneurysm, Dissecting ; complications ; Brain ; diagnostic imaging ; pathology ; Cerebral Infarction ; etiology ; therapy ; Female ; Glasgow Coma Scale ; Humans ; Postoperative Complications ; etiology ; therapy ; Tomography, X-Ray Computed

The purpose of this study was to identify time-related changes in clinical, MRI, histopathologic, and immunohistochemical findings associated with ischemic stroke in dogs. Additionally, the association of cerebrospinal fluid (CSF) and tissue levels of interleukin (IL)-6 with clinical prognosis was assessed. Ischemic stroke was induced by permanent middle cerebral artery occlusion (MCAO) in nine healthy experimental dogs. The dogs were divided into three groups according to survival time and duration of the experimental period: group A (survived only 1 day), group B (1-week experimental period), and group C (2-week experimental period). Neurologic status was evaluated daily. Magnetic resonance imaging (MRI) was performed according to a predetermined schedule. Concentration of IL-6 in CSF was measured serially after ischemic stroke. Postmortem examination was performed for all experimental dogs. During histopathological examination, variable degrees of cavitation and necrosis due to neuronal cytopathic effects, such as pyknotic nuclei and cytoplasmic shrinkage, were observed on the affected side of the cerebral cortex in all dogs. Immunohistochemistry specific for IL-6 showed increased expression in the ischemic lesions. CSF IL-6 concentrations and ischemic lesion volumes 1 day after ischemic stroke were significantly higher in group A compared to groups B and C.
Animals ; Brain Ischemia/*etiology ; Dogs ; Female ; *Immunohistochemistry ; *Infarction, Middle Cerebral Artery ; *Magnetic Resonance Imaging ; Male ; Stroke/*pathology

OBJECTIVETo establish a general method of focal cerebral ischemia model in different varieties of mice.

METHODEach group of healthy adult KM and C57BL/6 mice were randomly divided into control group (n = 10) and MCAO group (n = 10). The mice in MCAO group were applied in the preparation of the MCAO model by intraluminal occlusion using monofilament. Twenty-four hours after operation,the neurologic function was evaluated,middle cerebral artery blood flow was monitored and the infarction volume was calculated by TTC staining, to evaluate the reliability of the model.

RESULTIn the MCAO group, the base value of the cerebral blood flow down of KM and C57BL/6 mice respectively was (81.65 ± 4.59)%, (83.68 ± 6.25)%. The neurological deficit score respectively was (2.30 ± 0.82), (2.50 ± 0.80). TTC staining can clearly show the infarction area, and relatively stable, 24 hours of the survival rate of KM and C57BL/6 mice were 100% and 80% respectively.

CONCLUSIONThe key link is the optimization and improvement of monofilament, temperature, anesthesia and so on. The modified intraluminal occlusion of MCAO using monofilament is a kind of reliable and simple method to establish experimental cerebral ischemia model in mice.

Animals ; Blood Flow Velocity ; Brain ; blood supply ; pathology ; physiopathology ; Brain Ischemia ; complications ; physiopathology ; Cerebrovascular Circulation ; Disease Models, Animal ; Infarction, Middle Cerebral Artery ; complications ; physiopathology ; Male ; Mice, Inbred C57BL ; Middle Cerebral Artery ; pathology ; physiopathology ; surgery ; Nervous System Diseases ; etiology ; physiopathology ; Species Specificity

This study aimed to investigate inflammatory edema after cerebral ischemia through 7.0T MRI and proton magnetic resonance spectroscopy (MRS). All SD rats were randomly divided into sham operated group and middle cerebral artery occlusion (MCAO)-1 day, -3 day and -7 day groups. MRI scan of the brain was performed on a 7.0 Tesla MRI scanner. The volume of positive signals in the ischemic side was detected by using a T2 weighted spinecho multislice sequence; the changes in the height of water-peak were measured with point resolved spectroscopy (PRESS) sequences; cortical edema was detected by using wet-dry weight method; the degrees of nerve injury were evaluated by Bederson neurological score system; double-labeling immunofluorescence technique was used to explore the molecular mechanisms of post-ischemia cerebral edema. The results showed that high T2WI signals were observed in MCAO-1 day, -3 day and -7 day groups, and the water-peak height and water-peak area of MCAO groups were higher than those of sham operated group (P<0.05). Neurological score results were consistent with the degree of brain edema, and a large number of microglia accumulated in the ischemic cortex. Our results suggested that non-invasive MRI technology with the advantage of high spatial resolution and tissue resolution can comprehensively and dynamically observe inflammatory edema after cerebral ischemia from a three-dimensional space, and contribute to evaluation and treatments in clinic.
Animals ; Brain ; diagnostic imaging ; pathology ; Brain Edema ; diagnostic imaging ; etiology ; Brain Ischemia ; complications ; CD11b Antigen ; metabolism ; Immunohistochemistry ; Infarction, Middle Cerebral Artery ; complications ; Inflammation ; diagnostic imaging ; etiology ; Magnetic Resonance Imaging ; methods ; Magnetic Resonance Spectroscopy ; Male ; Microglia ; metabolism ; Microscopy, Confocal ; Microscopy, Fluorescence ; Radiography ; Rats ; Rats, Sprague-Dawley ; Reproducibility of Results ; Time Factors

OBJECTIVECerebral infarction (CI) is one of severe diseases of central nervous system in neonates, and some infants with CI could have poor prognosis in the long term. This study aimed to analyze the clinical data and prognosis of all neonatal cases with cerebral infarction in recent years and to help future clinical work.

METHODTotally 58 neonatal cases with CI admitted to NICU of the hospital from January 1999 to December 2010 were included in this study. We analyzed all clinical data and prognosis by retrospective analysis.

RESULTSFifty-two term babies and six preterm babies were included. There were altogether 51 cases with asphyxia and 7 with hemorrhagic cerebral infarction. Perinatal hypoxia-ischemia was the most common high-risk factor and it accounted for 46.6%. Seizure was the most frequent initial symptom and the most common clinical manifestation (accounted for 77.6%), and it was followed by intermittent cyanosis, apnea and lethargy. Cerebral CT scan and magnetic resonance imaging were major methods to help to make the diagnosis and they also had close relation with prognosis. Diffusion weighted imaging was very helpful to diagnose infarction in early stage. Left middle cerebral artery was the most common artery to be involved. Supportive therapy and symptomatic treatment were the main methods in the acute stage of neonatal cerebral infarction. Those babies with poor prognosis mostly had large infarction involving cerebral hemisphere, thalamus and basal ganglia.

CONCLUSIONSNeonatal cerebral infarction was a severe brain injury affecting long tern nervous system prognosis. Perinatal hypoxia was the most common high-risk factor and seizure was the most frequent initial symptom. Diffusion weighted imaging was valuable to diagnose infarction in early stage. Most of infants with poor prognosis had large infarction involving hemisphere, thalamus and basal ganglia. Early diagnosis with brain imaging would be helpful for rehabilitation therapy and improving prognosis.

Brain ; diagnostic imaging ; pathology ; Cerebral Infarction ; diagnosis ; etiology ; pathology ; therapy ; Cerebral Palsy ; etiology ; Humans ; Hypoxia-Ischemia, Brain ; complications ; Incidence ; Infant ; Infant, Newborn ; Magnetic Resonance Imaging ; Male ; Prognosis ; Radiography ; Retrospective Studies ; Risk Factors ; Seizures ; etiology ; Ultrasonography, Doppler, Color

OBJECTIVETo investigate the metabolic changes on proton magnetic resonance spectroscopy (¹H-MRS) in patients with first left basal ganglia infarction and their relationship with depression.

METHODSTwenty-two patients with first left basal ganglia infarction and 10 matched healthy controls were recruited in the study. Patients and controls underwent (1)H MRS scan and the spectrum of N-acetyl aspartic acid (NAA), choline (Cho) and creatinine (Cr) was recorded at the first week (D7) and 1 month after onset (M1), respectively. National Institutes of Health Stroke Scale (NIHSS), Ability of daily life (ADL), Hamilton Depression Scale (HAMD) were evaluated at D7, M1 and M6 after onset. The patients were classified into two groups: post-stroke depression (PSD) and non-post-stroke depression (NPSD) according to the result of HAMD.The differences of (1)H-MRS between these two groups were compared and their relationship with NIHSS and ADL was analyzed.

RESULTSAmong 22 patients 10 were diagnosed as PSD and 12 were NPSD. Compared to controls, NAA/Cr was significantly lower and Cho/Cr was significantly higher (P <0.05)in left prefrontal white matter and left basal ganglia in patients with infarct. Patients with PSD showed a lower NAA/Cr and higher Cho/Cr than NPSD patients (P <0.05). At M1 after onset, NAA/Cr in the left prefrontal white matter was significantly correlated with NIHSS (r=-0.551, P =0.032), while Cho/Cr was correlated with ADL (r=0.682, P=0.005)in PSD patients.

CONCLUSIONMetabolic changes shown on (1)H-MRS in patients with basal ganglia infarction may predict the occurrence of PSD.

Adult ; Basal Ganglia ; pathology ; Case-Control Studies ; Cerebral Infarction ; complications ; Depression ; diagnosis ; etiology ; metabolism ; Female ; Humans ; Magnetic Resonance Spectroscopy ; methods ; Male ; Middle Aged ; Protons

OBJECTIVETo investigate the impact of obstructive sleep apnea-hypopnea syndrome (OSAHS) on cerebral microbleeds (CMBs) in patients with cerebral infarction.

METHODSConsecutive patients with acute cerebral infarction who had cerebral microbleeds shown by susceptibility-weighted imaging (SWI) were enrolled to undergo polysomnography (PSG). The patients were divided into two groups, namely non-OSAHS group with apnea-hypopnea index (AHI) less than 5 and OSAHS group with greater AHI, and the clinical and radiological features of cerebral microbleeds were compared between them.

RESULTSForty-nine patients were enrolled in this study, including 27 (55.1%) with both cerebral infarction and OSAHS and 22 (44.9%) with cerebral infarction but not OSAHS. A comparison of the risk factors showed that hypertension, a smoking history, and a history of stroke were more prevalent in patients with OSAHS than in those without OSAHS (P<0.05). The incidences of subclinical stroke in OSAHS and non-OSAHS patients were 37.0% (10/27) and 9.0% (2/22) (P<0.05), respectively. Neurological imaging revealed a greater number of cerebral microbleeds in OSAHS group than in non-OSAHS group (P<0.05). In OSAHS patients, 77.8% of the microbleeds were distributed in cortical-subcortical areas, 55.6% in the basal ganglia area, and 25.9% in the infratentorial area, as compared to the percentages of 50.0%, 40.9% and 50.0% in non-OSAHS patients, respectively (P<0.05). In OSAHS patients, 40.7% also had leukoaraiosis, and 48.1% had two or more causes, as compared to the percentages of 13.6% and 18.2% in non-OSAHS patients, respectively (P<0.05).

CONCLUSIONSOSAHS can be a risk factor for cerebral microbleeds. Patients with both cerebral infarction and OSAHS tend to have greater and more extensive lesions of cerebral microbleeds, more complicated cause of the disease, and a grater likeliness of stroke recurrence.

Aged ; Cerebral Hemorrhage ; etiology ; pathology ; Cerebral Infarction ; pathology ; Female ; Humans ; Male ; Middle Aged ; Risk Factors ; Sleep Apnea, Obstructive ; complications ; pathology

Aspirin ; administration & dosage ; therapeutic use ; Brain ; diagnostic imaging ; pathology ; Cerebral Infarction ; diagnosis ; drug therapy ; etiology ; Epilepsy ; diagnosis ; drug therapy ; etiology ; Humans ; Immunoglobulins, Intravenous ; administration & dosage ; therapeutic use ; Infant ; Male ; Mucocutaneous Lymph Node Syndrome ; complications ; diagnosis ; drug therapy ; Tomography, X-Ray Computed