PubMed Health⌕ Search

Biomedical subjects

C Ertekin

Publications and source records attributed to C Ertekin.

At least 73 records · Page 4Linked to original sources
PubMed1995

Hand and genital sympathetic skin potentials in flaccid and erectile penile states in normal potent men and patients with premature ejaculation.

Sympathetic skin potentials were recorded from the hand and genital region in 14 normal potent men and 18 patients with premature ejaculations. With the penis flaccid the sympathetic skin potentials obtained did not differ significantly in both groups. However, when erection was induced by 50 mg. intracavernous papaverine injection, the genital sympathetic skin potentials were significantly suppressed in all but 3 normal men, while the hand potentials did not change. In subjects with premature ejaculation genital and hand sympathetic skin potentials were suppressed during erection as a generalized bodily reaction except in 1 patient. This phenomenon may indicate that the specific and regional suppression of genital sympathetic activity during erection could not be properly adjusted in patients with premature ejaculation.

Action Potentials↗
PubMed1994

Comparison of magnetic coil stimulation and needle electrical stimulation in the diagnosis of lumbosacral radiculopathy.

Electrical stimulation (ES) of lumbosacral nerve roots using a needle electrode inserted to the laminar level at the midline of Th12-L1 or L1-2 intervertebral interspace, was compared with magnetic stimulation using a 9-cm diameter coil (MCS) at the L3-4 or L4-5 spine levels, Compound muscle action potentials (CMAP) were superficially recorded from homologous muscles in both sides in 15 normal control subjects and in 20 patients with lumbosacral radiculopathy. Soleus muscles were used for S1, tibialis anterior (TA) for L5, and rectus femoris (RF) muscles for L4 roots. According to the clinical or radiological diagnosis (CAT, MRI and/or myelography) conventional needle EMG was capable to localise the root lesion in 16 of 20 patients (80%) and ES localised the root involvement in 18 of 20 patients (90%); the diagnostic value of MCS was lower, about 65% (13 of 20 patients). Although ES is uncomfortable and invasive, it is superior to needle EMG in localising unilateral or multiple lumbosacral root involvement. At present, MCS is not suitable for the diagnosis of lumbar radiculopathy.

Adult↗
PubMed1994

Diagnostic value of electrical stimulation of lumbosacral roots in radiculopathies.

Needle electrical stimulation of the lumbosacral roots at the laminar level of the Th12-L1 or L1-2 intervertebral spaces were performed in 24 normal subjects and 58 patients with various kinds of lumbar radiculopathy (unilateral L4, L5 and S1 herniated nucleus pulposus and lumber stenosis). The root stimulation method was compared with conventional needle EMG. Lumber electrical stimulation showed root abnormalities objectively in 80% of patients while the diagnostic value of needle EMG was 65%. Therefore, electrical root stimulation is superior to routine EMG for localizing lumbar root involvement. However, the only needle EMG demonstrated the root pathology in 7 cases (12%) and single electrophysiological abnormality was found by the root stimulation in 16 cases (27%). Thus, both electrophysiological methods should be complementary to each other in evaluation of the lumbar radioculopathy.

Action Potentials↗
PubMed1994

Prognostic value of transcranial magnetic stimulation in acute stroke.

BACKGROUND AND PURPOSE: The aim of this study is to evaluate the role of motor-evoked potentials (MEPs) in predicting functional recovery of hemiparesis and hemiplegia in acute stroke patients. METHODS: Twenty-seven acute stroke patients were evaluated clinically and electrophysiologically within the first week and 3 to 6 months after the event. Clinical assessment included a quantitative evaluation of motor ability and activities of daily living. MEPs were recorded from the abductor pollicis brevis and tibialis anterior muscles bilaterally. Correlations between clinical parameters and MEPs were assessed. RESULTS: In the acute period, no MEP could be detected in 17 of 27 patients. In these 17 patients, the clinical scores were worse than in the patients whose MEPs could be elicited. However, in the follow-up period (3 to 6 months), no significant differences in motor function were observed between the two groups. CONCLUSIONS: In the acute phase of stroke, neurophysiological parameters were correlated with the clinical findings, but MEPs had no value in predicting the outcome of hemiparesis and hemiplegia.

Acute Disease↗
PubMed1993

Sacral spinal cord and root potentials evoked by the stimulation of the dorsal nerve of penis and cord conduction delay for the bulbocavernosus reflex.

Segmental spinal cord and root potentials in response to stimulations of the dorsal nerve of penis, tibial nerve, and the sural nerve were epidurally recorded in normal subjects. EMG responses from the bulbocavernosus (BC) and the various leg muscles were also recorded in response to bipolar stimulations by the same epidural needle electrodes of the sacral cord and lumbosacral roots. The afferent conduction velocity from the penis to Th12-L1 intervertebral level was about 40 m/sec on the average, which is significantly slower than those obtained by the stimulation of the mixed and cutaneous nerves at the lower limb. The latency of the motor responses of the BC muscle from Th12-L1 spine levels were found comparatively longer than those of thigh muscles on maximal epidural stimulation in spite of the shorter distances to the BC muscle. The central conduction delay within the sacral cord of the bulbocavernosus reflex was calculated and found to be about 8.2 msec, while the central conduction time was about 1.1 msec for the Soleus-H-Reflex. These findings may suggest that there may be about 5-6 synapsis necessary for the first component of the bulbocavernosus reflex, though some faster oligosynaptic cord linkage may also exist.

Adolescent↗
PubMed1993

X-linked bulbospinal muscular atrophy (Kennedy's syndrome): a report of three cases.

Two cases of X-linked bulbo-spinal muscular atrophy and one sporadic case with the same clinical features are presented. All three cases were extensively studied by electrophysiological methods. One of the patients showed some transient weakness, which was partly improved by pyridostigmin. In this patient the Decrement test and jitter revealed a mild degree of motor-end plate dysfunction. Clinical and electrophysiological findings obtained from all three patients suggest that in Kennedy syndrome cell bodies of group IA muscle afferents are also affected selectively, with other peripheral afferents.

Electromyography↗
PubMed1991

[The role of peritoneal lavage in treatment of penetrating abdominal injuries].

Preventing negative laparotomies is one of the most challenging problems in the management of penetrating abdominal injuries. The term "selective laparotomy" has been therefore introduced and has found an ever increasing acceptance. The peritoneal lavage is a useful tool in patient selection for laparotomy but the main problem is where to set the boundary between a positive and a negative peritoneal lavage. The manipulation of this boundary leads to significant changes in the sensitivity and specificity of the peritoneal lavage. Here we are presenting 162 consecutive cases of penetrating abdominal trauma and discussing our methods of evaluation and management.

Abdominal Injuries↗
PubMed1990

Examination of the descending pathway to the external anal sphincter and pelvic floor muscles by transcranial cortical stimulation.

In 26 neurologically normal patients and 9 healthy volunteers EMG responses after transcranial cortical stimulation (TCCS) were recorded from the external anal sphincter (EAS), the anterior tibial muscle (TA), the bulbocavernosus muscle (BC) and the rectus abdominis muscle (RA). Electrical TCCS was used in 29 subjects and magnetic TCCS in 6 subjects. Response patterns in the different muscles in relation to the strength of the stimulus were analyzed. It was found that the response patterns related to the strength of stimulation differed totally between the TA and the EAS. When the stimulus strength was increased stepwise, a response with a latency of 31.9 +/- 2.5 msec was first recorded in the TA, followed at higher strength by a secondary response with a latency of approximately 100 msec. In contrast, a response with a latency of 105.5 +/- 23.9 msec was first recorded in the EAS. The latency of this response gradually shortened with increasing stimulus strength until a response with a constant latency of 36.1 +/- 6.1 was obtained. In some subjects the response pattern in the BC was similar to that in the TA, and in others it was similar to that in the EAS. Responses in the TA, RA and EAS were all facilitated during voluntary contraction of the EAS. Both responses in the TA and in the EAS were facilitated by voluntary contraction of the TA. During voluntary contraction of the TA an inhibitory period was always recorded, while in the EAS no inhibitory periods were observed during either contraction or relaxation. The hypothesis that the fastest cortico-motoneuronal pathway to the EAS is polysynaptic is proposed.

Adult↗
PubMed1990

Sympathetic skin potentials and bulbocavernosus reflex in patients with chronic alcoholism and impotence.

Fifteen chronic alcoholic male patients with impotence have been investigated with the electrophysiological method of sympathetic skin potentials recorded from the genital skin and with the electrically induced bulbocavernosus reflex. Both electrophysiological tests did not differ from those of normal controls. It was proposed that there is no obvious role of the peripheral neuropathic factors in the pathogenesis of impotence in chronic alcoholism.

Adult↗
PubMed1990

[Blunt kidney injuries in children].

Trauma, primarily due to traffic accidents, is the most common cause of death in childhood. In the context of abdominal trauma, the probability of injuries to urinary organs in children is higher than in adults. Peritoneal lavage and use of the CRAMS scale have proved to be reliable methods for assessment and planning of therapy for traumatised children. When it comes to treatment for splenic rupture, efforts should be made to preserve the greatest possible amount of splenic tissue to prevent post-splenectomy sepsis.

Adolescent↗
PubMed1990

[Blunt diaphragmatic rupture in children].

The incidence of traumatic diaphragmatic hernia due to blunt trauma, an uncommon injury in children, has been increased with the increase in automobile and pedestrian accidents. During a 5 year period, 9 patients 3-14 years of age, with acutely ruptured diaphragms following blunt trauma were treated in our institution. Diaphragmatic injury was detected within 6 hours of admission to the hospital. In 2 patients the diagnosis was suggested by upright chest X-ray. In the remaining 7 patients, the diaphragmatic ruptures were diagnosed at laparotomy performed for hemiperitoneum diagnosed by peritoneal lavage. At initial evaluation hypotension was present in all but one patient. Intraabdominal organs were herniated through the diaphragmatic defect in 3 patients. All patients had associated extraabdominal injuries and 90% had associated intraabdominal injuries. The diaphragmatic tear was repaired via abdomen in all patients and all defects were closed primarily. The mortality rate was 33.3%. Early deaths were attributable to hemorrhage and severe head injury, the single late death to sepsis and progressive multiorgan-failure.

Adolescent↗
PubMed1989

A neurophysiological study of patients undergoing radical prostatectomy.

24 men suffering from localized prostatic cancer undergoing radical retropubic nerve-sparing prostatectomy were investigated by the following electrophysiological methods: Bulbocavernosus reflexes elicited from the penile skin or the posterior urethra, sensory thresholds in the posterior urethra, cerebral evoked potentials after stimulation of the pudendal nerve or the posterior urethra. 15 men were examined 4-33 months postoperatively only, 5 men were examined only preoperatively and 4 men were examined both pre- and postoperatively. 10 men suffering from minor problems due to benign prostatic hyperplasia served as controls. In patients with localized cancer of the prostate, the findings did not differ from those in the control group. In the operated group the findings were pathological in a large proportion of the patients, indicating injuries both to nervous pathways running through the pelvic nerve plexus and in the pudendal nerve. The conclusions were: Localized cancer of the prostate has minimal or no risk at all of impaired functioning in the pelvic nervous pathways. Radical retropubic prostatectomy may in some cases be undertaken without any objective evidence of injury to these nervous pathways, but is often followed by findings indicating such injury. The dorsal nerve of the penis may be affected by the operation. Transcranial stimulation of the motor cortex is a useful method in the evaluation of prolonged or absent bulbocavernosus reflexes.

Aged↗
PubMed1987

Skin potentials (SP) recorded from the extremities and genital regions in normal and impotent subjects.

Skin potentials (SP) were evoked by peripheral nerve stimulation from the hands and feet of 41 and from the genital skin of 28 male, controls. The same methods were also applied in 10 functionally impotent cases, 32 diabetic impotent and 8 diabetic normopotent cases. The SP was easily obtained from all 3 sites in all normal subjects and in 10 functionally impotent cases. The SP recorded from the genital skin was either absent or abnormal in 53% of diabetic impotent cases with or without polyneuropathy, while the incidence of abnormalities encountered in the hand and/or foot recordings was 28%. In 8 diabetic normopotent cases the SP recorded from the genital and extremity skin were completely normal. SP recorded from the genital skin is a useful method of evaluating the autonomic-sympathetic dysfunction causing impotence, especially in patients who may have autonomic disorders either located in lumbosacral spinal cord and its efferents, or generalized autonomic-peripheral dysfunction.

Adolescent↗
PubMed1985

Descending lumbosacral cord potentials (DLCP) evoked by stimulation of the median nerve.

In 22 normal human subjects, descending lumbosacral cord potentials (DLCP) were recorded intrathecally after stimulation of the median nerve at the elbow. The onset of DLCP is very short in latency (mean 12.1 ms) with a prominent sharp early positive peak (mean latency 13.7 ms) followed by a sharp negative peak (mean 17.6 ms). The amplitude of the first part of DLCP varied between 0.6 and 6.7 microV (mean 2.3 microV). The response was recorded most easily when the tip of intrathecal electrode was posterolaterally positioned. The threshold of the response was above or around the excitation threshold of the motor nerve fibers and it could not be produced by pure skin nerve stimulation. It resisted to subtetanic peripheral shocks. Mean peripheral conduction velocity responsible for the response was about 60.8 m/s. Some late and slower deflections appeared in many cases. It was concluded that the DLCP must have originated from the descending and very fast conducting propriospinal pathways located within the anterolateral funiculus which has an oligosynaptic anatomical organization. This response seemed to be the first direct evidence of interlimb reflex action between the arm and leg in man which is important in the coordination of movements and posture.

Arm↗
PubMed1985

The value of somatosensory-evoked potentials and bulbocavernosus reflex in patients with impotence.

In 14 normal male adults and 97 male patients having impotence alone or together with systematic and/or neuro-psychiatric symptoms and signs, the somatosensory cerebral-evoked potentials were obtained by glans penis stimulation (penile SEP); by peroneal nerve stimulation (peroneal SEP) and by electrically-induced bulbocavernous (BC) reflex. In normal subjects, the configurations of both SEPs were basically similar, except that the onset of latency was 10-15 msec longer and the amplitude in the P1-N1 component was higher in penile SEP. BC-reflex latency was abnormally prolonged, especially in diabetic impotence and in patients with cauda/conus lesions, while the abnormalities on the penile and peroneal SEP were more frequent in patients with spinal cord injuries. MS and parkinsonism. In impotent patients with epilepsy, chronic prostatis and psychogenic problems, all the tests were generally normal.

Adolescent↗
PubMed1984

Somatosensory cerebral potentials evoked by stimulation of the lumbo-sacral spinal cord in normal subjects and in patients with conus medullaris and cauda equina lesions.

Somatosensory cerebral evoked potentials were recorded by intrathecal stimulation of the lumbo-sacral cord and roots in 16 normal subjects and patients having cauda/conus injury (group A, 15 cases), compressive lesions of cauda equina (group B, 13 cases) and lesions of both types covering the lumbar cord (group C, 24 cases). The shape of the intrathecally evoked cerebral potential (IECP) was basically the same as that obtained by posterior tibial nerve stimulation from 12 normal subjects except that the early components were 10-15 msec shorter in latency in the former potential, with an average of 12 msec. IECPs were easily recorded in groups A and B, but a significant delay was found in both groups, especially group A. It was difficult to obtain the IECP in group C, When it could be recorded the latency increase was apparent. These findings were explained on the basis of degeneration of the ascending spinal nerve fibers proximal to the lesion site.

Adult↗