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At least 649 records · Page 36Linked to original sources
PubMed2000

Prostate electromyography: a new concept.

Knowledge of the pharmacological and electrophysiological properties of prostatic smooth and striated muscle myofibres are necessary in order to determine whether the dynamic component of benign prostatic hyperplasia (BPH). To our knowledge prostate electromyography have not previously been applied in any type of prostate disorder. The purpose of the present study is to evaluate the electrical activity of the prostatic muscle fibers. We were able to evaluate the features of prostatic muscle action potentials (PMAP) in 15 of the 16 patients from the area around the prostate capsule. Prostate was palpated in the knee-chest position then concentric needle electrode was inserted into the prostate tissue under digital guidance. Needle tip position in the prostate was confirmed with transabdominal ultrasonography. PMAPs were analysed with multi-motor unit action potential analysis (MMA) algorithm. Whenever the PMAPs were unsuitable for analysing with MMA software the amplitude trigger line method was used. Further studies with a large number of patients are needed to establish the correlation between the electrical activity of prostatic muscle fibers and dynamic component of patients with symptomatic BPH.

Adult↗
PubMed2000

[Recovery process after the diphtheric polyneuropathy according to interference electromyography].

In order to control the recovery process after diphtheric polyneuropathy the dynamics of activity of m.flexor carpi radialis with increasing force was repetitively investigated in 12 patients using surface electromyography (EMG). In patients examined 12.4 +/- 2.9 months after the onset of diphtheria neurogenic type of EMG (decreased amplitude and number of turns along with increasing force) was established. 11-14 months later clinical improvement followed by positive changes of EMG parameters was documented.

Adolescent↗
PubMedDate not supplied

[Single fiber electromyography in the diagnosis of myasthenia gravis].

INTRODUCTION: The electrophysiological exam complements the clinical diagnosis in patients with suspected myasthenia gravis. The most common used electrophysiological test are the repetitive nerve stimulation test (RNST) and the single fiber electromyography (SFEMG); this last one is more sensitive than the first one. OBJECTIVE: To describe the usefulness of SFEMG in a group of myasthenic patients. PATIENTS AND METHODS: We studied 52 patients with a clinical diagnosis of myasthenia gravis (female: 35, male: 17; age range: 10-48 years). They were classified according to Osserman (type I, IIa, IIb, III and IV) and correlated to the electrophysiological findings. RNST was carried out in abductor digiti minimi, trapezius and orbicularis oculi; and SFEMG was carried out in the extensor digiturum communis and frontalis muscles. It was analyzed the sensitiveness of each technique detecting neuromuscular transmission abnormalities, and the correspondence between the results of both techniques. RESULTS: The most frequent clinical form observed was the type I (22 patients), followed by 18 as type IIa, 9 as type IIb, and 3 as type IV; no one as type III. RNST with positive decrement was observed in 48% of patients, but neuromuscular jitter calculated by means of SFEMG was abnormal in the 100% of them, being statistically significant the difference (chi 2 = 79.72; p = 0.000). The highest positivity index in the SFEMG was observed in the frontalis muscle. Patients from groups IV, IIb and I were the most electrophysiologically affected (t = 8.23211; p < 0.05). CONCLUSION: SFEMG is a very sensitive electrophysiological tool, detecting abnormalities in neuromuscular jitter in the 100% of myasthenic patients, with an excellent clinical correlation.

Adolescent↗
PubMed2000

[Electromyography monitoring in the treatment of torticollis with botulinum toxin].

UNLABELLED: The new method of treatment chronic torticollis is injection into affected muscles botulinum's toxin. Some physicians in diagnostic procedure, treatment and monitoring use needle electromyography (nEMG). The aim of our study was the estimation of the value of nEMG in chronic torticollis treatment. We examined 34 patients with chronic torticollis 4 weeks after botulinum's toxin injection into affected muscles. We have been looking for denervations signs in affected muscles. We found denervations signs in 26 patients. In both muscles sterno-cleido-mastoideus and trapezius we found denervations signs in 13 patients, only in sterno-cleido-mastoideus muscles in 9 patients and in 4 patients only in trapezius muscles. 17 patients from this group improved. The overall rate of improvement in this group was 65%. In 8 patient we didn't find any denervation signs but the rate of improvement in this group was extremely high--87%. CONCLUSION: EMG examination doesn't play deciding role in the monitoring of torticollis treatment with botulinum toxin.

Adult↗
PubMedDate not supplied

Neural networks and wavelet decomposition for classification of surface electromyography.

To determine the status of a muscle, surface electromyography (SEMG) is a useful tool being non-invasive and easy to record. Clinicians are able to classify the signal visually but because of the large number of parameters of the signal, automatic classification becomes difficult. This paper reports our efforts at using wavelet transforms to process the signal before using neural networks for classification. We have found that by using specific wavelet functions and at specific levels of decomposition, the features of the signal correlating with muscle status were highlighted.

Action Potentials↗
PubMed1975

Electromyography in paraspinal muscles following surgery for root compression.

The paraspinal muscles were examined by electromyography (EMG) in 20 patients who had undergone laminectomy for root compression in the lumbosacral region. Cases were carefully selected to include only those in which there was no evidence of recurrent radiculopathy. The precise anatomic sites having electromyographic (EMG) abnormalities (fibrillation potentials and positive sharp waves) were determined. These data were obtained to determine if EMG of paraspinal muscles following laminectomy is useful in patients with a suspected recurrence. EMG was done 1 cm and 3 cm lateral from the midline at each vertebral level from L3 through S2. The interval between surgery and EMG ranged from 3-1/2 to 41 months. Seventeen of the 20 cases showed EMG abnormalities; and of these, 15 were abnormal at three or more vertebral levels and 13 at both 1 cm and 3 cm from the midline. It was shown that patients who have undergone laminectomy for root compression may demonstrate EMG changes in the paraspinal muscles for periods of up to 41 months postoperatively even without recurrent radiculopathy. The abnormalities are usually present at both 1 and 3 cm lateral from the midline and at multiple vertebral levels.

Adult↗
PubMed2001

Mechanomyography, electromyography, heart rate, and ratings of perceived exertion during incremental cycle ergometry.

BACKGROUND: The purpose of this investigation was to examine the relationships of mchanomyography (MMG), electromyography (EMG), heart rate (HR), and ratings of perceived exertion (RPE) versus power output during incremental cycle ergometry. METHODS: Nine adult males [mean (+/-SD) age 23 (+/-3) years] volunteered to perform an incremental test to exhaustion on a cycle ergometer. The MMG, EMG, HR, and RPE values were recorded at the end of each power output. RESULTS: The normalized (expressed as a percentage of maximal values) relationships for MMG, HR, and RPE versus power output were linear, while the EMG versus power output relationship was quadratic. Furthermore, there were no significant (p > 0.10) differences between slope coefficients for the relationships among MMG, HR, and RPE versus power output. CONCLUSIONS: The results of this investigation indicated that there were close associations among the mechanical (MMG), cardiac (HR), and perception of effort (RPE) aspects of cycle ergometry. In addition, there was a dissociation between the linear MMG pattern and quadratic EMG pattern with increasing power outputs.

Adult↗
PubMed2001

Surface electromyography in patients with tension-type headache and normal healthy subjects.

Headache is one of the most common medical symptoms and tension - type headache is the most common form. Pericranial muscles have been invoked as a source of nociception among patients with tension - type headache. This study was performed to determine surface electromyography (EMG) as representative of the electrical activity of pericranial muscles in tension - type headache and normal subjects during rest and mental calculation. Surface EMG recordings were performed in 20 normal subjects (age 33.9 +/- 8.9 years) and 20 tension-type headache patients (34.5 +/- 9.4 years) using electroencephalograph during the initial rest period for 5 minutes, during mental calculation for 2 minutes and 3 minutes of the rest period. Surface EMG was scored as discharge score (DS) at the third, sixth and ninth minute. The DS at each minute studied showed that the headache group had higher electrical activity than the normal group and increased EMG activity during mental stress was found in the headache group.

Adult↗
PubMed2001

An orthopedic surgeon's guide to interpreting electromyography.

Electrodiagnostic tests such as electromyography (EMG) and nerve conduction velocity studies are commonly ordered during the evaluation of patients with suspected peripheral nerve compression. Although these tests are invaluable extensions of the physical examination, many physicians are unable to interpret the test results, and so they base their operative decisions on electromyographers' impressions. A systematic approach to EMG interpretation allows surgeons to determine the nature and location of lesions as well as the degree of involvement and the viability of affected skeletal muscles.

Electromyography↗
PubMed1975

A new urethroanal reflex revealed by sphincter electromyography.

Anal sphincter electromyography carried out during dilatation of the anesthetized urethra revealed a reflexogenic zone at the bladder neck, dilatation of which causes contraction of the anal sphincter. This reflex appears to be separate and distinct from previously described reflexes of the bulbocavernosus type which are triggered by somatic sensory stimuli. A possible role of this reflex in the separation of the functions of micturition and defecation is postulated.

Anal Canal↗
PubMedDate not supplied

Classification of dynamic multi-channel Electromyography by Neural Network.

Muscles are responsible for movement of the limbs. Muscle contraction is accompanied by electrical activity that is measurable and is the Electromyography (EMG) recording. Due to the complex nature of the signal, detailed analysis and classification is often difficult, especially if the EMG relates to movement. This paper reports the research to determine features of the multi-channel EMG signal recording that correlate with the movement of the hand of the subject. Different processing techniques are reported. It demonstrates integral of the RMS of the signal correlates best with the movement.

Electromyography↗
PubMed2001

[How I explore ... lumbar paraspinal muscle electromyography in the assessment of radiculopathy].

Lumbar paraspinal muscles examination is an interesting part of the electrodiagnostic evaluation of patients with suspected lumbosacral radiculopathy. However, many electromyographers hesitate to routinely include that technique in their study of lower limbs. The purpose of this paper is to specify the anatomy and electrophysiologic data of multifidus lumbar paraspinal muscle. Previous anatomic studies indicate that the medial lumbar multifidus and lumbar interspinalis muscles share unisegmental innervation by the dorsal ram of the spinal nerve. Electromyography of these muscles can improve the sensitivity of lumbosacral radiculopathy detection. Multi-MUP analysis of quantitative electromyographic parameters in lumbar paraspinal muscles, in a population of 75 healthy subjects without back pain, allowed to set up normal values for the L5 myotome.

Action Potentials↗
PubMed2001

[Electromyography study of the anterior tibial muscle and accidental falls in the elderly].

This article investigates if surface electromyography of the tibialis anterior muscle during rest, maximal contraction and balance stressing pick out elderly people at risk for falling. With a same view postural responses underlying balance control were recorded as well. Four groups were compared: an experimental group composed of nursing home residents (n = 15) with three or more unexplained falls in the prior year, a nonfalling control group of nursing home residents (n = 15) of equivalent age, a group of subjects (n = 15) in middle age and finally a group of young participants (n = 15). EMG activity during maximal contraction of the tibialis anterior muscle was significantly lower in the falling group and the postural responses during balance testing were inappropriate.

Accidental Falls↗
PubMed1996

[Electromyography. Aid in diagnosis, therapy and therapy evaluation in temporomandibular dysfunction].

Electromyography (EMG) has been applied in studies on patients with temporomandibular dysfunction (TMD), usually with surface electrodes, focusing on rest position of the mandible, hyperactivity and hypo-activity of the muscles, muscle balance, muscle symmetry, reflex activity and parafunctional activity. The contribution of the use of EMG to the diagnostics of individual patients is considered to be marginal, at the most. However, EMG can be valuable in research on TMD if methodological pitfalls are avoided.

Electrodes↗
PubMed2002

[The importance of larynx electromyography for the differential diagnosis of vocal cord fixation].

Fourteen patients have been studied, with precedents of endotracheal intubation, suffering dysphonia and fixation of one vocal cord (13 cases) or both (1 case). The lack of neutrogen signs was confirmed through conventional electromyography, and objectivity because the clinical findings pointing to a direct traumatism of the vocal cord, the cricoarytenoid joint or an inflammatory origin of the damage. We support the limitation of electromyographic procedures of the larynx facing the conductive techniques and concede the possibility of the use of magnetic stimulation with this purpose.

Adult↗
PubMed2002

Needle electromyography in carpal tunnel syndrome.

The role of needle electromyography (EMG) in the routine evaluation of carpal tunnel syndrome (CTS) is not clear. The aim of this study was to determine if needle EMG examination of the thenar muscles could provide useful information in addition to the nerve conduction (NC) studies. Electrophysiologic procedures performed on 84 patients (103 hands) consistent with CTS were reviewed. The median thenar motor NC data were matched with the needle EMG findings in the abductor pollicis brevis (APB) muscle. The severity of the needle EMG findings in the APB muscle correlated well with the severity of the motor NC data. As the thenar compound muscle action potential amplitude decreased and the degree of nerve conduction slowing and block across the wrist increased, there was a corresponding increase in the number of enlarged motor units and decrease in the recruitment pattern in the needle EMG findings. Needle EMG examination confined to the thenar muscles in CTS does not seem to provide any further information when the NC data had already established this diagnosis, and it should not be performed routinely.

Adult↗