Zhen-Ni Guo

Jilin University, Jilin, Jilin Sheng, China

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Publications (8)21.25 Total impact

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    ABSTRACT: Stroke of large-artery atherosclerosis and small-artery occlusion are two main subtypes of stroke according to TOAST classification. The underlying mechanisms of how these two subtypes affect dynamic cerebral autoregulation (dCA) might be heterogeneous, resulting in varied clinical conditions and outcomes. We therefore studied the pattern of dCA in these two subtypes. Forty-one patients with acute unilateral middle cerebral artery (MCA) territory stroke (15 with ipsilateral large-artery atherosclerosis and 26 with small-artery occlusion) and 20 healthy volunteers were enrolled. Non-invasive continuous cerebral blood flow velocity and arterial blood pressure were recorded simultaneously from each subject in supine position using transcranial Doppler on MCA bilaterally and servo-controlled plethysmograph on the middle finger, respectively. Transfer function analysis was applied to derive autoregulatory parameters, gain, phase difference (PD), and slope of step response. In the large-artery atherosclerosis group, PD in affected hemisphere was 42.9±18.5 degree, which is significantly lower than the unaffected hemisphere (72.4±29.9 degree, P<0.01), and the healthy group (P<0.01). However, PD is similar in the unaffected hemisphere and healthy group (P>0.1). In the small-artery occlusion group, PD in the affected hemisphere was similar to that in the contralateral hemisphere (33.8±17.9 vs. 32.6±21.1 degree, P>0.1), both sides were significantly lower than the healthy group (all P<0.001).The results of the slope of step response agree with the findings in PD. DCA in different subtypes of acute ischemic stroke is heterogeneous, which might be attributed to the varied pathologic changes of cerebral blood vessels.
    PLoS ONE 01/2014; 9(3):e93213. · 3.73 Impact Factor
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    ABSTRACT: Previous studies with small sample size have shown that cilostazol can reduce the risk of cerebral vasospasm in patients with aneurysmal subarachnoid hemorrhage (SAH). The purpose of this study was to determine whether cilostazol is effective in patients with aneurysmal SAH. Studies investigating the effect of cilostazol in patients with aneurysmal SAH were identified using Embase.com without language or publication-type restrictions. We used the random-effect model to combine data. Pooled risk ratios (RR) and 95% confidence intervals (CI) were calculated. Two randomized controlled trials and two quasi-randomized controlled trials with a total of 340 patients were included. The incidence of symptomatic vasospasm (RR=0.47; 95% CI, 0.31-0.72; p<0.001), severe vasospasm (RR=0.48; 95% CI, 0.28-0.82; p=0.007), vasospasm-related new cerebral infarctions (RR=0.38; 95% CI, 0.22-0.67; p=0.001), and poor outcome (RR=0.57; 95% CI, 0.37-0.88; p=0.011) were significantly lower in the cilostazol group. The numbers needed to treat for these outcomes were 6.4, 6.3, 5.7, and 5.4, respectively. Mortality rate differences between the two groups were insignificant. No statistical heterogeneity was found for all outcomes. These results show that cilostazol can decrease the incidence of symptomatic vasospasm, severe vasospasm, vasospasm-related new cerebral infarctions, and poor outcome in patients with aneurysmal SAH.
    Journal of the neurological sciences 10/2013; · 2.32 Impact Factor
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    ABSTRACT: Carotid or cerebral artery stenosis resulting in low perfusion is a major cause of ischemic stroke. Understanding the unique hemodynamic features in each patient undergoing a stroke-in-progress (SIP) and the correlation between progression and cerebral blood flow (CBF) status would help in the diagnosis and treatment of individual patients. We used xenon-enhanced CT (Xe-CT) to examine cerebral perfusion in patients with or without SIP (30 patients/group), recruited from October 2009 to October 2010. Only SIP patients with unilateral stenosis in the internal or middle cerebral artery were recruited. The occurrence of watershed infarction was higher in the SIP group than in the non-SIP group (P < 0.05). In the SIP group, larger hypoperfused areas were found around the lesions than in the non-SIP group. In the SIP group, the CBF values in the ipsilateral areas were significantly lower than those in corresponding regions on the contralateral side. CBF values in the contralateral hemisphere were significantly lower in the SIP group than in the non-SIP group. In SIP patients, infarctions were surrounded by larger hypoperfused areas than in non-SIP patients. These larger hypoperfused areas may result in pathological damage to the brain that is responsible for the progression of stroke.
    Neuroscience Bulletin 09/2013; · 1.37 Impact Factor
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    ABSTRACT: OBJECTIVE: Cerebral autoregulation (CA) is the mechanism by which constant cerebral blood flow is maintained despite changes in cerebral perfusion pressure. CA can be evaluated by dynamic monitoring of cerebral blood flow velocity (CBFV) with transcranial Doppler sonography (TCD). The present study aimed to explore CA in chronic anxiety. METHODS: Subjects with Hamilton anxiety scale scores ≥14 were enrolled and the dynamic changes of CBFV in response to an orthostatic challenge were investigated using TCD. RESULTS: In both the anxious and the healthy subjects, the mean CBFV was significantly lower in the upright position than when supine. However, the CBFV changes from supine to upright differed between the anxious and the healthy groups. Anxious subjects showed more pronounced decreases in CBFV with abrupt standing. CONCLUSION: Our results indicate that cerebrovascular modulation is compromised in chronic anxiety; anxious subjects have some insufficiency in maintaining cerebral perfusion after postural change. Given the fact that anxiety and impaired CA are associated with cardiovascular disease, early ascertainment of compromised cerebrovascular modulation using TCD might suggest interventional therapies in the anxious population, and improve the primary prevention of cardiovascular disease.
    Neuroscience Bulletin 11/2012; · 1.37 Impact Factor
  • The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques 05/2012; 39(3):383-4. · 1.33 Impact Factor
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    ABSTRACT: Multiple sclerosis (MS) is a chronic inflammatory demyelinating disorder of the central nervous system characterized by episodic and progressive neurologic dysfunction resulting from inflammatory and autoimmune reactions. The underlying pathogenesis of MS remains largely unclear. However, it is currently accepted as a T cell-mediated autoimmune disease. Among other clinical manifestations, sexual dysfunction (SD) is a painful but still underreported and underdiagnosed symptom of the disorder. SD in MS patients may result from a complex set of conditions and may be associated with multiple anatomic, physiologic, biologic, medical and psychological factors. SD arises primarily from lesions affecting the neural pathways involved in physiologic function. In addition, psychological factors, the side effects of medications and physical symptoms such as fatigue, muscular weakness, menstrual changes, pain and concerns about bladder and bowel incontinence may also be involved. Since MS primarily affects young people, SD secondary to MS may have a great impact on quality of life. Thus, maintaining a healthy sexual life with MS is an important priority. The treatment of SD requires multidisciplinary teamwork and cooperation among specialists, individual patients, partners and the society.
    Asian Journal of Andrology 03/2012; 14(4):530-5. · 2.14 Impact Factor
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    ABSTRACT: To report a case of progressive facial hemiatrophy with unusual features of contralateral brain atrophy and transcranial Doppler ultrasound evidence of autonomic dysfunction. Case report. A teaching hospital. A 63-year-old man who presented with a 10-year history of progressive right-sided facial atrophy and recent facial pain. Brain magnetic resonance imaging revealed left frontoparietal atrophy. Transcranial Doppler ultrasound demonstrated evidence of autonomic dysfunction ipsilateral to brain atrophy. This case expands the spectrum of findings in progressive facial hemiatrophy to include contralateral brain atrophy and suggests that sympathetic dysfunction might play a pathogenic role in progressive facial hemiatrophy.
    Archives of neurology 09/2011; 68(9):1195-7. · 7.58 Impact Factor
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    ABSTRACT: Mycoplasma pneumoniae (M. pneumoniae) is a frequent cause for human infection, and central nervous system disease associated with M. pneumoniae infection is being reported with increasing frequency. We described herein a 60-year-old woman who developed meningitis associated with bilateral optic papillitis following M. pneumoniae infection and discussed the possible mechanisms. To our knowledge, there have been only a few reports that described the meningitis complicated by bilateral optic papillitis in association with M. pneumoniae infection. Our case highlighted the protean neurological manifestations of M. pneumoniae infection.
    Neurological Sciences 07/2011; 33(2):355-8. · 1.41 Impact Factor