scholarly journals Differential Diagnosis of Parkinson Disease, Essential Tremor, and Enhanced Physiological Tremor with the Tremor Analysis of EMG

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Jie Zhang ◽  
Yan Xing ◽  
Xiuli Ma ◽  
Liqun Feng
Keyword(s):  
Differential Diagnosis ◽  
Muscle Contraction ◽  
Essential Tremor ◽  
Diagnostic Value ◽  
Physiological Tremor ◽  
Contraction Pattern ◽  
Load Effect ◽  
Synchronous Contraction ◽  
Tremor Frequency ◽  
Tremor Analysis

We investigate the differential diagnostic value of tremor analysis of EMG on Parkinson’s disease (PD), essential tremor (ET), and enhanced physiological tremor (EPT). Clinical data from 25 patients with PD, 20 patients with ET, and 20 patients with EPT were collected. The tremor frequency and muscle contraction pattern of the resting, posture, and 500 g and 1000 g overload were recorded. The frequency of PD tremor was 4–6 Hz, and the frequency of ET was also in this range; the frequency of EPT is 6–12 hz having some overlap with PD. The muscle contraction patterns of the ET and EPT group were mainly synchronous contraction, and the muscle contraction mode of the PD group was mainly alternating contraction. Having tremor latency from rest to postural position and having changes in tremor amplitude after mental concentration in PD might distinguish ET. Tremor analysis of EMG was able to distinguish PD from ET and EPT by varying the tremor frequency and muscle contraction pattern. It can also differentiate between PD and ET by the latency and concentration effect and ET and EPT by weight load effect.

Cortical Involvement in the Generation of Essential Tremor

2007 ◽  
Vol 97 (5) ◽  
pp. 3219-3228 ◽  
Author(s):  
Jan Raethjen ◽  
R. B. Govindan ◽  
Florian Kopper ◽  
M. Muthuraman ◽  
Günther Deuschl
Keyword(s):  
Essential Tremor ◽  
Hot Spot ◽  
Power Spectra ◽  
Emg Activity ◽  
Cortical Circuits ◽  
Coherent Signals ◽  
Cortical Motor ◽  
Tremor Frequency ◽  
Cortical Involvement

Conflicting results on the existence of tremor-related cortical activity in essential tremor (ET) have raised questions on the role of the cortex in tremor generation. Here we attempt to address these issues. We recorded 64 channel surface EEGs and EMGs from forearm muscles in 15 patients with definite ET. EEG and EMG power spectra, relative power of the rhythmic EMG activity, relative EEG power at the tremor frequency, and EEG–EMG and EEG–EEG coherence were calculated and their dynamics over time explored. Corticomuscular delay was studied using a new method for narrow-band coherent signals. Corticomuscular coherence in the contralateral central region at the tremor frequency was present in all patients in recordings with a relative tremor EMG power exceeding a certain level. However, the coherence was lost intermittently even with tremors far above this level. Physiological 15- to 30-Hz coherence was found consistently in 11 patients with significantly weaker EMG activity in this frequency range. A more frontal (mesial) hot spot was also intermittently coupled with the tremor and the central hot spot in five patients. Corticomuscular delays were compatible with transmission in fast corticospinal pathways and feedback of the tremor signal. Thus the tremor rhythm is intermittently relayed only in different cortical motor areas. We hypothesize that tremor oscillations build up in different subcortical and subcortico-cortical circuits only temporarily entraining each other.

scholarly journals Diagnostic value of diffusion weighted MRI and ADC in differential diagnosis of cavernous hemangioma of the liver

2016 ◽  
Vol 16 (1) ◽  
pp. 227 ◽  
Author(s):  
Ozlem Tokgoz ◽  
Ebru Unlu ◽  
Ilker Unal ◽  
Ismail Serifoglu ◽  
Ilker Oz ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Cavernous Hemangioma ◽  
Diagnostic Value ◽  
Diffusion Weighted Mri ◽  
Diffusion Weighted

scholarly journals Tremorography in the clinical practice

2020 ◽  
Vol 9 (4) ◽  
pp. 61-72
Author(s):  
T. G. Govorova ◽  
T. E. Popova ◽  
A. A. Tappakhov
Keyword(s):  
Differential Diagnosis ◽  
Clinical Practice ◽  
Movement Disorders ◽  
Clinical Characteristics ◽  
Objective Assessment ◽  
Diagnostic Value ◽  
Common Type ◽  
Routine Practice ◽  
Pathological Tremor

Tremor is the most common type of movement disorders. In practice this differential diagnosis of hyperkinesis is diagnosed clinically and the use of additional methods of objective assessment of tremor increases the accuracy of diagnosis. The use of paraclinical methods of objective assessment of tremor improves the accuracy of diagnosis. Comparison of the neurophysiological parameters of tremor with clinical characteristics has a high diagnostic value, which justifies its use in the routine practice of neurologists. The purpose of the review is to analysis basic electrophysiological characteristics of pathological tremor, as well as the presentation of the material of its own observation.

scholarly journals Usefulness of procalcitonin (PCT), C-reactive protein (CRP), and white blood cell (WBC) levels in the differential diagnosis of acute bacterial, viral, and mycoplasmal respiratory tract infections in children

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yang Li ◽  
Lanfang Min ◽  
Xin Zhang
Keyword(s):  
Differential Diagnosis ◽  
Respiratory Tract ◽  
Bacterial Infection ◽  
Bacterial Infections ◽  
Respiratory Tract Infections ◽  
Respiratory Infections ◽  
Diagnostic Value ◽  
Significant Difference ◽  
Group A ◽  
Tract Infections

Abstract Background There is a lack of studies comparing PCT, CRP and WBC levels in the differential diagnosis of acute bacterial, viral, and mycoplasmal respiratory tract infections. It is necessary to explore the correlation between above markers and different types of ARTI. Methods 108 children with confirmed bacterial infection were regarded as group A, 116 children with virus infection were regarded as group B, and 122 children with mycoplasmal infection were regarded as group C. The levels of PCT, CRP and WBC of the three groups were detected and compared. Results The levels of PCT, CRP and WBC in group A were significantly higher than those in groups B and C (p < 0.05). The positive rate of combined detection of PCT, CRP and WBC was significant higher than that of single detection. There was no significant difference in PCT, CRP and WBC levels between the group of G+ bacterial infection and G− bacterial infection (p > 0.05). ROC curve results showed that the AUC of PCT, CRP and WBC for the diagnosis of bacterial respiratory infections were 0.65, 0.55, and 0.58, respectively. Conclusions PCT, CRP and WBC can be combined as effective indicators for the identification of acute bacterial or no-bacterial infections in children. The levels of PCT and CRP have higher differential diagnostic value than that of WBC in infection, and the combined examination of the three is more valuable in clinic.

scholarly journals Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

2019 ◽  
Vol 22 (3) ◽  
pp. 425-431
Author(s):  
Neiandro Santos Galvão ◽  
Antonione Santos Bezerra Pinto ◽  
Alan Leandro Carvalho Farias ◽  
André Luiz Ferreira Costa ◽  
Sérgio Lúcio Pereira de Castro Lopes ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Additional Information ◽  
Imaging Characteristics ◽  
Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

scholarly journals Pediatric Appendicitis Score in differential diagnosis of acute nonspecific abdominal pain in children: age matters

2021 ◽  
pp. 22-31
Author(s):  
V.G. Vakulchyk ◽  
◽  
A.V. Kapytski ◽  
Keyword(s):  
Differential Diagnosis ◽  
Abdominal Pain ◽  
Acute Appendicitis ◽  
Roc Curves ◽  
Diagnostic Value ◽  
Diagnostic Significance ◽  
Predictive Values ◽  
Detection Frequency ◽  
Specificity And Sensitivity ◽  
Appendicitis Score

Acute nonspecific abdominal pain in children is the most common problem requiring differential diagnosis with acute appendicitis. Scales for integrated assessment of individual symptoms and their combinations have been proposed and are constantly being developed that allow predicting the likelihood of acute appendicitis. Purpose to assess diagnostic value of Pediatric Appendicitis Score (PAS) in groups of children in different ages. Materials and methods. 374 children aged 4 to 15 years with acute abdominal pain were evaluated in prospective randomized blinded study. Statistical analysis: ROC – curves, specificity and sensitivity, positive and negative predictive values; Kullback criteria; logistic regression analysis; discriminant analysis. Results. Detection frequency and diagnostic significance of the PAS scale predictors as well as obtained results by using the Pediatric Appendicitis Score depend on children age significantly. In terms of diagnosis of acute appendicitis, the PAS scale shows the best results in older children. Conclusions. Results of Pediatric Appendicitis Score depend on children ages due to different diagnostic value of predictors used in the PAS scale. Pediatric surgeons should keep in your mind these data. Modification of the scale is required taking into account the patient’s age. Further analysis of the issue of PAS using is needed. The research was carried out in accordance with the principles of the Helsinki Declaration. The study protocol was approved by the Local Ethics Committee of these Institutes. The informed consent of the patient was obtained for conducting the studies. The authors declare no conflicts of interests. Key words: acute appendicitis, children, diagnosis, PAS scale.

A novel approach to differential diagnosis of Parkinson’s disease and essential tremor

2020 ◽  
Vol 120 (12) ◽  
pp. 18
Author(s):  
D.V. Pokhabov ◽  
D.D. Pokhabov ◽  
V.G. Abramov ◽  
M.E. Tunik ◽  
K.O. Tutsenko ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Differential Diagnosis ◽  
Essential Tremor ◽  
Novel Approach
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