Translocator Protein (18 kDa) Polymorphism (rs6971) in the Korean Population

Background@#and Purpose: The expression of the 18-kDA mitochondrial translocator protein (TSPO) in the brain is an attractive target to study neuroinflammation. However, the binding properties of TSPO ligands are reportedly dependent on genetic polymorphism of the TSPO gene (rs6971). The objective of this study is to investigate the rs6971 gene polymorphism in the Korean population. @*Methods@#We performed genetic testing on 109 subjects including patients with mild cognitive impairment, Alzheimer’s disease (AD) dementia, non-AD dementia, and cognitively unimpaired participants. Magnetic resonance imaging scans and detailed neuropsychological tests were also performed, and 29 participants underwent 18 F-DPA714 PET scans. Exon 4 of the TSPO gene containing the polymorphism rs6971 (Ala or Thr at position 147) was polymerase chain reaction amplified and sequenced using the Sanger method. The identified rs6971 genotype codes (C/C, C/T, or T/T) of the TSPO protein generated high-, mixed-, or lowaffinity binding phenotypes (HABs, MABs, and LABs), respectively. @*Results@#We found that 96.3% of the study subjects were HAB (105 out of 109 subjects), and 3.7% of the subjects were MAB (4 out of 109 subjects). 18 F-DPA-714 PET scans showed nonspecific binding to the thalamus and brainstem, and increased tracer uptake throughout the cortex in cognitively impaired patients. The participant with the MAB polymorphism had a higher DPA714 signal throughout the cortex. @*Conclusions@#The majority of Koreans are HAB (approx. 96%). Therefore, the polymorphism of the rs6971 gene would have a smaller impact on the availability of second-generation TSPO PET tracers.

Novel Pathogenic Variant of SPAST (c.1413+4A>G) in a Patient with Hereditary Spastic Paraplegia

No abstract available.

Re: Comments on “Pure or Complex Hereditary Spastic Paraplegia Type 4?”: The Authors Respond

No abstract available.

Atypical Acute Motor Axonal Neuropathy with Cerebrospinal Pleocytosis Mimicking Myelitis

No abstract available.

Pontine Infarct Presenting as Peripheral Type Unilateral Facial Palsy

Acute peripheral facial palsy usually manifests Bell's palsy of unknown cause, and rarely lacunar infarct which located in facial nucleus can mimic peripheral facial palsy. A 73 year-old man with isolated facial asymmetry diagnosed with lacunar infarction which selectively involve the facial fascicles which lie in inferolateral aspect of pons. Clinicians should take into account the possibility of central lesion and brain stem infarction, even when patients present with isolated peripheral type facial palsy.

Tau PET Imaging in a Patient with Posterior Cortical Atrophy Using ¹⁸F-THK5351

No abstract available.

Subarachnoid Hemorrhage Showed Only on T2-Weighted Magnetic Resonance Imaging

We present the case of a 28-year-old pregnant woman with subarachnoid hemorrhage who was initially unable to undergo a CT scan and exhibited interestingly high signal intensities only on T2-weighted MRI without any signal change on fluid attenuated inversion recovery and gradient-echo imaging. These findings could be explained by a combination of factors that increase the signal intensity with elevations in the concentrations of protein and oxyhemoglobin due to massive bleeding and with the decreased fluid void signal inferred by the presence of hydrocephalus.

Diffuse Calcification Restricted on Periventricular White Matter by Primary Hypoparathyroidism

No abstract available.

Clinical and Electrophysiological Changes after Open Carpal Tunnel Release: Preliminary Study of 25 Hands / 대한임상신경생리학회지

BACKGROUND: Electrophysiological study has been known as a useful method to evaluate the therapeutic effect of operation in idiopathic carpal tunnel syndrome (CTS). The purpose of this study was to evaluate the clinical and electrophysiological changes after carpal tunnel release (CTR) compared to the preoperative results. METHODS: We analyzed the changes of nerve conduction study (NCS) before and after minimal open carpal tunnel release in 18 patients (25 hands) with CTS. Follow-up study was performed over 6 months after operation. RESULTS: Clinical improvement was seen in all cases after CTR. In contrast, electrophysiological improvement was various depending on the parameters; the mean median sensory latency and nerve conduction velocity (NCV) improved significantly (p = 0.001). The mean median motor latency also improved, but NCV and compound muscle action potential (CMAP) amplitude did not change. The extent of improvement was evident in moderate CTS, but not in severe CTS. CONCLUSIONS: In this preliminary study, all subjects who underwent CTR achieved a clinical relief along with a significant improvement of electrophysiological parameters such as median sensory latency, sensory NCV and median distal motor latency. After CTR, a number of cases with mild to moderate CTS showed a prominent improvement of clinical and electrophysiological parameters, while fewer improvements were seen in severe CTS, although it did not reach the statistical significance.

Intracranial Cystic Metastasis Mimicking Neurocysticercosis in a Pregnant Woman

Brain metastasis can form large cystic lesions, and its differentiation on the basis of imaging findings alone is difficult. A 36-year-old woman with headache visited emergency room. Two years ago, she was diagnosed as neurocysticercosis and had taken anti-parasite medications. However, in the current visit, the sizes of intracranial cystic lesions increased. Brain biopsy reported metastatic neuroendocrine tumor, and chest CT showed the primary site of the tumor. Cystic brain metastasis should be considered in cases with cystic brain lesions.

Arterial Stiffness and Functional Outcome in Acute Ischemic Stroke

OBJECTIVE: Arterial stiffness is a common change associated with aging and can be evaluated by measuring pulse wave velocity (PWV) between sites in the arterial tree, with the stiffer artery having the higher PWV. Arterial stiffness is associated with the risk of stroke in the general population and of fatal stroke in hypertensive patients. This study is to clarify whether PWV value predicts functional outcome of acute ischemic stroke. METHODS: One hundred patients were enrolled with a diagnosis of acute ischemic stroke and categorized into two groups: large-artery atherosclerosis (LAAS) or small vessel disease (SVD) subtype of Trial of Org 10172 in Acute Stroke Treatment (TOAST) classification. Each group was divided into two sub-groups based on the functional outcome of acute ischemic stroke, indicated by modified Rankin Scale (mRS) at discharge. Poor functional outcome group was defined as a mRS > or = 3 at discharge. Student's t-test or Mann-Whitney U-test were used to compare maximal brachial-ankle PWV (baPWV) values. RESULTS: Twenty-four patients whose state was inadequate to assess baPWV or mRS were excluded. There were 38 patients with good functional outcome (mRS or = 3). The baPWV values were significantly higher in patients with poor outcome (2,070.05 +/- 518.37 cm/s) compared with those with good outcome (1,838.63 +/- 436.65) (p = 0.039). In patients with SVD subtype, there was a significant difference of baPWV values between groups (2,163.18 +/- 412.71 vs. 1,789.80 +/- 421.91, p = 0.022), while there was no significant difference of baPWV among patients with LAAS subtype (2,071.76 +/- 618.42 vs. 1,878.00 +/- 365.35, p = 0.579). CONCLUSIONS: Arterial stiffness indicated by baPWV is associated with the functional outcome of acute ischemic stroke. This finding suggests that measurement of baPWV predicts functional outcome in patients with stroke especially those whose TOAST classification was confirmed as SVD subtype.

Sleep Problems Associated with Behavioral and Psychological Symptoms as Well as Cognitive Functions in Alzheimer's Disease

BACKGROUND AND PURPOSE: It has been shown that sleep problems in Alzheimer's disease (AD) are associated with cognitive impairment and behavioral problems. In fact, most of studies have founded that daytime sleepiness is significantly correlated with cognitive decline in AD. However, a few studies have also shown that nighttime sleep problems are associated with cognitive function and behavioral symptoms in AD. Accordingly, the aim of this study was to evaluate the effects of nighttime sleep on cognition and behavioral and psychological symptoms of dementia (BPSD) in AD. METHODS: The study population comprised 117 subjects: 63 AD patients and 54 age- and sex-matched non-demented elderly subjects. Detailed cognitive functions and behavioral symptoms were measured using the Seoul Neuropsychological Screening Battery (SNSB) and the Korean version of the Neuropsychiatric Inventory (NPI-K). Sleep characteristics were evaluated using the Korean version of the Pittsburgh Sleep Quality Index (PSQI-K). The correlations between PSQI-K and SNSB scores and between PSQI-K and NPI-K scores were analyzed. RESULTS: In AD patients, sleep latency was found to be negatively correlated with praxis (p=0.041), Rey-Osterrieth Complex Figure Test (RCFT) immediate recall (p=0.041), and RCFT recognition (p=0.008) after controlling for age and education, while sleep duration and sleep efficiency were positively correlated with praxis (p=0.034 and p=0.025, respectively). Although no significant correlation was found between PSQI-K and NPI-K scores, sleep disturbance and total PSQI-K scores were found to be significantly associated with apathy/indifference in AD. CONCLUSIONS: Sleep problems such as prolonged sleep duration, sleep latency, and poor sleep efficiency in AD patients were correlated with cognitive dysfunction, and especially frontal executive and visuospatial functions, and BPSD. These findings suggest that treatment of nighttime sleep problems might improve cognition and behavioral symptoms in AD patients.

Dynamic Arterial Change of Cerebral Vasoconstriction in Reversible Cerebral Vasoconstriction Syndrome

No abstract available.

Relation Between Left Atrial Enlargement and Stroke Subtypes in Acute Ischemic Stroke Patients

OBJECTIVE: Increased atrial size is frequently seen in ischemic stroke patients in clinical practice. There is controversy about whether left atrial enlargement (LAE) should be regarded as a risk factor for cerebral infarction. We investigated the association between indexed left atrial volume (LAVI) and conventional stroke risk factors as well as stroke subtypes in acute ischemic stroke patients. METHODS: One hundred eighty two acute cerebral infarction patients were included in this study. Brain magnetic resonance imaging and transthoracic echocardiography were done for all patients within 30 days of diagnosis of acute cerebral infarction. Echocardiographic LAE was identified when LAVI was more than 27 mL/m2. Stroke subtypes were classified by the Trial of Org 10171 in acute stroke treatment classification. RESULTS: There were significant differences between subjects with normal and increased LAVI in prevalence of stroke risk factors including atrial fibrillation (p = 0.001), hypertension (p = 0.000), valvular heart disease (p = 0.011) and previous stroke (p = 0.031). An increased LAVI was associated with cardioembolic subtype with an adjusted odds ratio was 6.749 (p = 0.002) compared with small vessel disease. CONCLUSION: Increased LAVI was more prevalent in those who had cardiovascular risk factors, such as atrial fibrillation, hypertension, valvular heart disease and history of previous stroke. LAE influenced most patients in all subtypes of ischemic stroke but was most prevalent in the cardioembolic stroke subtype. Increased LAVI might be a risk factor of cerebral infarction, especially in patients with cardioembolic stroke subtype.

Relation Between Left Atrial Enlargement and Stroke Subtypes in Acute Ischemic Stroke Patients

OBJECTIVE: Increased atrial size is frequently seen in ischemic stroke patients in clinical practice. There is controversy about whether left atrial enlargement (LAE) should be regarded as a risk factor for cerebral infarction. We investigated the association between indexed left atrial volume (LAVI) and conventional stroke risk factors as well as stroke subtypes in acute ischemic stroke patients. METHODS: One hundred eighty two acute cerebral infarction patients were included in this study. Brain magnetic resonance imaging and transthoracic echocardiography were done for all patients within 30 days of diagnosis of acute cerebral infarction. Echocardiographic LAE was identified when LAVI was more than 27 mL/m2. Stroke subtypes were classified by the Trial of Org 10171 in acute stroke treatment classification. RESULTS: There were significant differences between subjects with normal and increased LAVI in prevalence of stroke risk factors including atrial fibrillation (p = 0.001), hypertension (p = 0.000), valvular heart disease (p = 0.011) and previous stroke (p = 0.031). An increased LAVI was associated with cardioembolic subtype with an adjusted odds ratio was 6.749 (p = 0.002) compared with small vessel disease. CONCLUSION: Increased LAVI was more prevalent in those who had cardiovascular risk factors, such as atrial fibrillation, hypertension, valvular heart disease and history of previous stroke. LAE influenced most patients in all subtypes of ischemic stroke but was most prevalent in the cardioembolic stroke subtype. Increased LAVI might be a risk factor of cerebral infarction, especially in patients with cardioembolic stroke subtype.

A Case of Cluster Headache Accompanied by Myoclonus and Hemiparesis

BACKGROUND: Cluster headache is a primary headache disorder characterized by periodic episodes of intense headache accompanied by autonomic symptoms. We report an unusual clinical presentation of cluster headache that was preceded by myoclonus and accompanied by hemiparesis. CASE REPORT: A 26-year-old man visited hospital due to recurrent jerky movements on the left side of his face and neck area lasting 3 days. These jerky movements had disappeared spontaneously without specific treatment. On the 10th day after onset of the jerky movements, the patient developed a series of unilateral severe headaches that were accompanied by autonomic symptoms lasting 1-2 hours. According to the second edition of The International Classification of Headache Disorders, he was diagnosed as having cluster headache. Two of the 16 severe headache attacks this patient suffered were accompanied by dysarthria and hemiparesis. Electroencephalography performed during hemiparesis revealed diffuse lateralized slow activity on the ipsilateral hemisphere of the headache side. The headache and accompanying hemiparesis disappeared after medical treatment for cluster headache. CONCLUSIONS: We describe a case of cluster headache accompanied by hemiparesis, which was preceded by myoclonus. We also outline the possible mechanisms underlying this case.

The Relations of Otholith Function Tests and Risk Factors of Benign Paroxysmal Positional Vertigo / 대한평형의학회지

BACKGROUND AND OBJECTIVES: Since the liberated otoconia from the degenerated utricle has been postulated as the cause of the benign paroxysmal positional vertigo (BPPV), the relationship of the utricular function and the generation of BPPV have been studied. In addition, abnormal bone metabolism and vascular risk factors resulting insufficient circulation to utricle has been reported to be related to the utricular degeneration in BPPV. We investigated the relationship between the vascular risk factors, bone mineral density (BMD) and recurrence for the BPPV and otholith function tests of BPPV. MATERIALS AND METHODS: Consecutive patients 84 with BPPV were recruited in a dizziness clinic. Caloric test, ocular vestibular evoked myogenic potentials (oVEMPs) were tested in all the patients in acute phase of BPPV. At the same time, vascular risk factors and BMD were performed. Vascular risk factors were history of hypertension, diabetes mellitus, hyperlipidemia and ischemic heart disease. All the data were analyzed for the relationship between abnormal results of vestibular function tests and the risk factors. RESULTS: Patients 58 (69%) showed abnormal cervical VEMPs that were related to decreased bone density, having more than one vascular risk factor, and older age (>55 years). Abnormal oVEMPs were showed in 53 patients (63%) that were related to older age and vascular risk factors, but not statistically related to bone mineral density. Caloric tests failed to show any statistically significant results. CONCLUSION: We found abnormal results of cVEMPs and oVEMPs is related to the BMD, vascular risk factors and age. VEMPs could be used for the demonstration of presumptive otolith degeneration in BPPV.

Pure Retrograde Amnesia: Is This Real Organic or Psychogenic?

Cases showing memory disturbances with isolated retrograde memory without any definitive brain lesions are classified as dissociative amnesia. Improvements in imaging techniques have allowed the organic causes of this disease to be identified in several recent cases. Several studies have diagnosed cases of memory disorders as pure retrograde amnesia (PRA). The patient reported here had no psychiatric disorder and had normal MRI results, but showed hypometabolism in PET that met the criteria for PRA.

Cerebral Toxocariasis Presented With Seizure and Memory Disturbance

Toxocariasis has a broad clinical spectrum, from asymptomatic to systemic illness. However, cerebral toxocariasis has rarely been reported. We experienced a patient who presented with seizure and memory disturbance after treatment for visceral larva migrans of toxocariasis. Laboratory findings included eosinophilia, cerebrospinal fluid (CSF) pleocytosis, and positive results for toxocariasis in the serum and CSF. The patient showed marked improvement after combined albendazole and steroid treatment. This case indicates that cerebral toxocariasis is an unusual cause of cognitive dysfunction and seizure.

Preliminary Study About Effect of Continuous Positive Airway Pressure on Cardiac Autonomic Imbalance in Obstructive Sleep Apnea Syndrome

BACKGROUND: Obstructive sleep apnea syndrome (OSAS) is associated with cardiac arrhythmia due to autonomic dysfunction. The aim of this study was to elucidate the effect of OSAS on the QT interval and the efficacy of continuous positive airway pressure (CPAP) treatment on a prolonged QT interval. METHODS: From March 2007 to January 2008, 13 patients diagnosed as OSAS received CPAP treatment. Ten age- and sex-matched healthy controls were enrolled, and nighttime polysomnography was performed. We analyzed the full-night electrocardiogram.which is one of the elements of nighttime polysomnography.in all patients and controls. RESULTS: In the patient group, the QTc interval was 0.380+/-0.45 ms (mean+/-SD) before CPAP treatment and 0.368+/-0.32 ms during CPAP treatment. In the control group, the QTc interval was 0.348+/-0.26 ms. The QTc interval did not differ between OSAS patients and controls (p=0.143), but it did significantly shorten between before and after CPAP treatment (p=0.047). CONCLUSIONS: This study suggests that CPAP treatment can improve QTc prolongation and thereby prevent future ventricular arrhythmia.