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Changes of the f-wave in the acute phase of permanent spinal cord ischaemic injury predict spinal cord function in animal models of rabbits

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Journal of Translational Neuroscience 2020年第3期5卷 15-24页

作者： Yunfei Zhou Shuchao Zhao Yuanyuan Jiang Xingming Liu Xueyuan Heng Jian Zhang Qimin Song Clinical Medicine Department Binzhou Medical UniversityYantaiShandong 264033China Department of Pathology Affiliated Hospital of Qingdao UniversityQingdaoShandong 266000China Oncology Gynecology Qingdao Central(Tumor)HospitalQingdaoShandong 266042China Department of Neurosurgery Linyi Central HospitalLinyiShandong 276400China Department of Neurosurgery Linyi People’s HospitalLinyiShandong 276003China

Objective:to explore the changes of the f-wave in the posterior tibial nerve of rabbits after different levels of lumbar spinal cord ischaemic injury and its correlation with motor function and the extent of lumbar spinal cord pathological ***:thirty New Zealand rabbits were randomly divided into 6 *** control group(n=5)was used to exclude the influence of anaesthesia and surgery on the *** levels of lumbar arteries were ligated in the five experimental groups(n=5).The f-wave was recorded to observe the changes in the acute phase of spinal cord *** correlation between the changes of the f-wave in the acute reversible phase and the motor function of the spinal cord was *** functions were assessed after surgery and 2 d after vascular *** specimens were taken 2 d after ligation for histopathologic ***:the results for the control group indicated that anaesthesia and surgery did not affect the f-wave *** was no statistically significant difference in the f-wave amplitudes and latency before and after ligation in the 1 and 2 level ligation *** f-wave changed immediately after ligation in the 3,4 and 5 ligation *** latency of the f-wave gradually extended,the amplitude of the f-wave gradually *** amplitude variations of the f-wave were positively correlated with the motor function 2 d after ligation,there was a statistically significant *** the increase in the number of vascular ligation,the degree of destruction of the motor neurons in the anterior horn of the spinal cord in the pathological specimens ***:the f-waves in the posterior tibial nerve of rabbits were found to be sensitive to the lumbar spinal cord ischaemic injury and specific to predict motor function.

关键词： f-wave spinal cord ischaemic injury animal models

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Needle Electromyography, f-wave, and H-Reflex: A Critical Reappraisal of Their Utility in the Diagnosis of Various Sensory Symptoms in the Extremities and Spine in the Setting of Normal Neurological Examination

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Open Journal of Orthopedics 2021年第12期11卷 383-391页

作者： Reynaldo P. Lazaro Thomas S. Eagan Neurology and Electroneuromyography Clinic Oneonta NY USA Orthopaedic and Wellness Center and Electroneuromyography Clinic Gloversville NY USA

Objective: Health care providers refer their patients to electromyography (EMG) laboratories for the evaluation of various sensory symptoms in the extremities and spine. The procedure is usually performed in conjunction with transcutaneous electrical stimulation of peripheral nerves and elicitation of the F-wave and H-reflex. The present study aimed to determine the real value of these procedures in the diagnosis of sensory symptoms in the setting of a normal neurologic examination. Method: The EMG reports and clinical histories of 100 patients, including 10 patients evaluated by other electromyographers, were reviewed. The study was focused on those with normal neurological examinations and those without histories of ongoing medical disorders and major surgeries to the extremities and spine. Results: All EMGs, F-wave, and H-reflex reports reviewed were normal, including those obtained from the second procedure performed in some patients and of those who subsequently underwent spinal surgery. Neurologic examination in all patients was normal. Conclusion: Needle EMG, F-wave and H-Reflex examinations are predictably normal in patients with non-dermatomal, non-neuropathic sensory symptoms with normal neurologic examination and without history of prefont-family:Verdana;">font-family:Verdana;">font-family:Ver

关键词： EMG Electromyography f-wave H-Reflex Procedural Indications

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A clinical neurophysiology study of Hirayama disease

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Chinese Medical Journal 2012年第6期125卷 1115-1120页

作者： WANG Xin-ning CUI Li-ying LIU Ming-sheng GUAN Yu-zhou LI Ben-hong DU Hua Department of Neurology Peking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100730China

Background Hirayama disease is a rare disease characterized by juvenile-onset of asymmetric amyotrophy, of which etiology has not been clarified. The aim of our study was to investigate the clinical and neurophysiologic characteristics of Hirayama disease. Methods Neurophysiological tests, including nerve conduction studies （NCS）, f-wave and routine electromyography （EMG）, were performed in seventy-three patients with Hirayama disease. EMG was selectively performed on upper and lower extremities, sternocleidomast and thoracic paravertebral muscles according to the clinical features of the patients. Results Abnormal NCS parameters, including decreased compound muscle action potentials or delayed distal motor latency, were found in 34.2% （25/73） and 12.3% （9/73） of the patients, respectively. A total of 24.6% （18/73） of the patients showed decreased f-wave frequency. EMG demonstrated the presence of neurogenic lesions in all patients with spontaneous potentials, prolonged duration or augmentation of amplitude in motor unit potentials （MUPs）, or a single pattern of MUP recruitment. About 17.8% （13/73） of the patients showed neurogenic lesions, mostly in the C7-8 level of the cervical cord, only in the upper extremity of affected side, whereas 35.6% （26/73） of the patients possessed lesions in the upper extremities bilaterally. A total of 46.6% （34/73） of patients exhibited abnormalities in the lower extremities, sterno- cleidomast or thoracic paravertebral muscle. Changes in motor NCS were significantly correlated with muscle strength. Conclusions EMG detects diffused subclinical neurogenic lesion in a high proportion of patients with Hirayama disease. Results of our study challenge the hypothesis that Hirayama disease is a type of cervical myelopathy.

关键词： Hirayama disease nerve conduction study electromyography f-wave

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frequency-domain Analysis of ECG Signal

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工程科学（英文版） 2007年第1期5卷 90-94页

作者： Tu Chengyuan Zeng Yanjun Li Shuxin College of Mechanical Engineering & Electro-Technique Beijing University of TechnologyBeijing 100022

A new simple approach to effectively detect QRS-T complexes in ECG curve is described, so as to easily get the P-wave (when Af does not happen) or the f-wave (when Af happens). By means of signal processing techniques such as the power spectrum function,the auto-correlation function and cross-correlation function, two kinds of ECG signal when Af does or does not happen were successively analyzed, showing the evident differences between them.

关键词： ECG curve P-wave f-wave histogram Af(atrial fibrillation) cross-correlation power spectrum auto-correlation

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