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Biomedical subjects

A Maleci

Publications and source records attributed to A Maleci.

At least 19 recordsLinked to original sources
PubMed2005

Increase in 20-50 Hz (gamma frequencies) power spectrum and synchronization after chronic vagal nerve stimulation.

OBJECTIVE: Though vagus nerve stimulation (VNS) is an important option in pharmaco-resistant epilepsy, its mechanism of action remains unclear. The observation that VNS desynchronised the EEG activity in animals suggested that this mechanism could be involved in VNS antiepileptic effects in humans. Indeed VNS decreases spiking bursts, whereas its effects on the EEG background remain uncertain. The objective of the present study is to investigate how VNS affects local and inter regional syncronization in different frequencies in pharmaco-resistant partial epilepsy. METHODS: Digital recordings acquired in 11 epileptic subjects 1 year and 1 week before VNS surgery were compared with that obtained 1 month and 1 year after VNS activation. Power spectrum and synchronization were then analyzed and compared with an epileptic group of 10 patients treated with AEDs only. RESULTS: VNS decreases the synchronization of theta frequencies (P < 0.01), whereas it increases gamma power spectrum and synchronization (< 0.001 and 0.01, respectively). CONCLUSIONS: The reduction of theta frequencies and the increase in power spectrum and synchronization of gamma bands can be related to VNS anticonvulsant mechanism. In addition, gamma modulation could also play a seizure-independent role in improving attentional performances. SIGNIFICANCE: These results suggest that some antiepileptic mechanisms affected by VNS can be modulated by or be the reflection of EEG changes.

Adult↗
PubMed2005

Posterior lumbar interbody fusion with peek cages: personal experience with 20 patients.

AIM: The use of interbody cages to obtain fusion in the lumbar spine has increased noticeably in the last few years. They are used both with and without posterior stabilization. In our institution a prospective analysis to determine whether PEEK cages can be used as a stand alone device has been performed. METHODS: The 20 patients with PEEK cages had clinical and radiological follow-up with controls at 1, 3, 6 and 9 months. RESULTS: The clinical results were considered satisfactory in 75% of the cases. There were no intra-or perioperative complications. There was no displacement of the cages. No signs of unsuccessful fusion were observed. CONCLUSIONS: Interbody PEEK cages fulfill the objective of stabilizing the treated segment immediately and subsequently. They can be used as stand alone devices with the correct surgical technique and following precise indications.

Adult↗
PubMed2004

Occipital condyle fractures: a hidden nosologic entity. An experience with 10 cases.

INTRODUCTION: To report the incidence, treatment and outcome of occipital condyle fractures (OCFs) based on the experience of a single neurosurgical department over a period of two years. MATERIAL AND METHODS: From April 1999 to April 2001, ten cases of OCFs were identified in 110 cervical traumas observed over a period of two years. Patients were studied by cervical x-rays, high-resolution CT scan with a 1-2 mm slice of the cranio-cervical junction (CCJ) and MRI in selected cases to evaluate the integrity of supporting ligaments. According to the Anderson and Montesano classification, 5 cases of type III, 3 cases of type II and 2 cases of type I fractures were found. Dysfunction of lower cranial nerves was observed in 8 cases. Treatment was conservative in all cases. RESULTS: At follow-up, ranging from 18 months to 2 years, fusion was obtained in all cases; 8 patients were neurologically intact, one patient presented a mild persistent dysphonia and another mild trapezius weakness. CONCLUSION: OCFs are actually not rare, rather they are often overlooked. In cases of high-energy trauma of the cervical spine, the diagnostic suspicion should be kept in mind.High-resolution CT scan with slice at 1-2 mm of the CCJ is the key radiological examination in the diagnosis of this lesion. Conservative treatment using a hard collar is sufficient to obtain sound fusion.

Adolescent↗
PubMed1998

Pars interarticularis fenestration in the treatment of foraminal lumbar disc herniation: a further surgical approach.

OBJECTIVE: A new surgical approach to foraminal disc herniation is proposed. METHODS: The procedure was performed in 28 patients during a span of 3 years. The herniation was purely foraminal in 18 patients and mainly foraminal with a definite extraforaminal component in the other 10 patients. Surgical treatment was offered only after 6 weeks of therapy with anti-inflammatory drugs and strict bed rest had proved to be ineffective. SURGICAL TECHNIQUE: To unroof the foraminal compartment, an ovoid fenestration (10 x 5 mm) is cut, with its major longitudinal axis at the level of the pars interarticularis, just medially and slightly off-center under the lateral isthmic notch, i.e., below the pedicle projection. This fenestration exposes the foraminal root compressed by the herniated disc, which can be easily removed. RESULTS: Treatment was successful in all patients, with swift remission of pain and only mild postoperative discomfort. All patients resumed their occupations as usual within 10 to 30 days after the operation, according to type of work. Mean follow-up is 24 months (range, 12-36 mo), without any return of pain. CONCLUSION: We propose pars interarticularis fenestration because it spares, with minimal bone removal, the facet joints and the anatomic continuity of the pars interarticularis, yet properly exposes the foraminal compartment both medially and laterally and thereby permits optimal removal of the disc herniation.

Adult↗
PubMed1996

Intramedullary astrocytoma with cartilage formation. Case report.

A case of intramedullary astrocytoma with cartilage formation is reported. The presence of bone or cartilage in a glioma is most unusual and has been described only in the brain, characteristically in ependymomas and astrocytomas of the midline. As far as we know, the present is the first intramedullary case. The histological and immunohistochemical findings are discussed in the light of the various hypotheses that attempt to explain the presence of cartilage within a glioma.

Adult↗
PubMed1995

Defective expression of interferon-gamma, granulocyte-macrophage colony-stimulating factor, tumor necrosis factor alpha, and interleukin-6 in activated peripheral blood lymphocytes from glioma patients.

The ability of a mannoprotein antigen from Candida albicans (MP) or interleukin-2 (IL-2) to induce cytokines in cultures of peripheral blood mononuclear cells (PBMC) of glioma patients and healthy controls was evaluated by mRNA expression and by protein secretion. The subjects studied were all responsive to both MP and IL-2, as assayed by lymphoproliferation of PBMC cultures. In control subjects, MP and IL-2 were strong inducers of IFN-gamma, IL-1 beta, TNF-alpha, and GM-CSF mRNA expression, but only MP was able to induce considerable levels of IL-6 and IL-2 mRNA expression. In MP-activated PBMC from glioma subjects, a highly defective IFN-gamma, together with a significant reduction in TNF-alpha and GM-CSF mRNA expression, was observed. This impairment was paralleled by a decreased accumulation of IL-6 and IL-2 mRNA. The pattern of cytokine mRNAs in IL-2-activated PBMC of glioma patients confirmed the impairment of IFN-gamma mRNA expression paralleled by a reduction in IL-6, TNF-alpha and GM-CSF mRNA, compared with healthy subjects. Coherently, in PBMC cultures from glioma patients, there was a clear-cut decrease in the secretion of IL-6 and TNF-alpha and especially of IFN-gamma compared with healthy controls. No or very low levels of IL-4, IL-10, and TGF-beta 2 mRNA expression were detected in PBMC cultures of both glioma and control populations, irrespective of the activation conditions.(ABSTRACT TRUNCATED AT 250 WORDS)

Astrocytoma↗
PubMed1995

Iatrogenic spinopelvic cerebro-spinal fluid fistula. Case report.

Perineurial cysts usually affect the lumbosacral spinal nerve roots, but sometimes they can erode the sacrum and reach the retroperitoneal space. In such cases misdiagnosis can lead to an improper treatment and cause serious complications. A presacral mass was diagnosed in a young woman during routine ultrasound investigation, and an exploratory laparotomy was performed. A large, fluid-containing cyst was found and marsupialized into the pelvis. After operation the patient experienced headache, vomiting and VI cranial nerve palsy whenever she stood up. By radiculography a iatrogenic spinopelvic cerebro-spinal fluid fistula was diagnosed, which required further surgery to be repaired. The presence of a giant perineurial cyst in the pelvis in unusual but must be considered in the differential diagnosis of presacral masses; the exceptionally rare case reported in this paper is exemplar of the harmful complications that an incautious procedure can determine.

Adult↗
PubMed1994

Crossed aphasia. An update.

The aim of this article is to present an update of a rare but interesting problem: "crossed aphasia". This term indicates the presence of aphasia after unilateral cerebral lesion of the hemisphere ipsilateral to the patient's dominant hand. We report two cases, review the most relevant literature, and analyze clinical, neuroanatomical, and neurophysiological aspects, taking in consideration the various interpretations proposed to explain this unusual language disorder.

Aged↗
PubMed1994

Severe exacerbation of post traumatic syringomyelia after lithotripsy. Case report.

A case of post traumatic thoracic syringomyelia is reported which presented with an acute and severe worsening of the spinal cord condition after extracorporeal shock wave lithotripsy was performed for ureteral stone. The worsening was probably caused by the shock waves reverberating the fluid within the intramedullary cavity producing further damage to the spinal cord.

Humans↗
PubMed1994

Medulloblastoma in late adults: report of two cases and critical review of the literature.

The authors describe two cases of medulloblastoma occurring in two men aged 71 and 67 years respectively. Medulloblastoma in late adults (older than 65 years) is an exceptional occurrence, and in this age group is generally of the classic type. Our first case was exceptional for the long survival of the patient compared with those so far reported for the same age group.

Aged↗
PubMed1993

Isolated haemangioblastoma of spinal cord: report of 18 cases and a review of the literature.

Eighteen cases of isolated spinal haemangioblastoma are presented. 13 patients were male and 5 female; average age was 34 years. The site of the tumour was bulbo-cervical in 1 case, cervical in 6, cervico-thoracic in 2, thoracic in 7, thoraco-lumbar in 2. Surgical excision of the tumor was total in all cases and peri-operative mortality was 5%. At average follow-up of 11 years, 8 patients had died (4 from neurological causes and 4 from non-neurological disease), and 9 survived; symptoms and signs improved in 11 cases, and were not improved in 6. The biological and pathological characteristics of this tumour are reported in the light of the present 18 cases and those reported in the literature.

Adolescent↗
PubMed1993

Ultrasound-guided brain biopsy: a personal experience with emphasis on its indication.

Between January 1989 and June 1991, 40 ultrasound-guided biopsies of supratentorial brain lesions exceeding 15 mm in diameter were performed. The apparatus used was Berger's neurobiopsy set, intraoperative 5 = MHz transducer, and a B-mode scanner. In 38 cases (95%) the procedure provided a histological diagnosis at the first attempt; in two patients, early in the present series, biopsy was repeated by computed tomography-guided technique due to insufficient samples. Operative mortality was zero and there were no septic complications. Clinical symptoms were stationary after the procedure in 34 cases; two cases temporarily worsened due to postbiopsy edema and subcortical hemorrhage, respectively; and four other cases showed an improvement as a result of evacuation of neoplastic cysts. Histologically, there were 24 primary malignant tumors, eight low-grade glial tumors, five metastatic tumors, two abscesses, and one lymphoma. The ultrasound method for brain lesion biopsy was found to be a simple, quick, and low-cost method that gave reliable results. It is indicated for supratentorial lesions over 15 mm in diameter that do not demand absolute anatomical accuracy.

Adult↗
PubMed1993

Extradural haematoma of posterior cranial fossa.

Two cases of extradural haematoma of posterior fossa with an acute course are reported. After trauma, the two patients did not show any symptom for a time of 16 and 18 hours respectively. Both of them showed a status of coma at the moment of hospitalization. The haematoma was diagnosed by CT scan. Both of them were immediately operated in order to evacuate the haematoma. Afterwards, one of the patients presented cerebellar symptoms while the other did not show any neurologic deficiency. The authors have analysed cases of this rare form of post-traumatic pathology referred in the literature since 1941, examining them from a clinical, therapeutic and prognostic point of view. The best diagnostic and therapeutic procedures to follow on this subject are then stressed.

Accidents, Traffic↗
PubMed1992

Medulloblastoma in children and in adults: a comparative study.

We report on the clinical and pathological characters and factors influencing prognosis in a consecutive series of 20 cases of medulloblastoma presenting in childhood and of 20 cases of the tumour presenting in adulthood. The significant differences which emerged were compared with the findings of the largest published series. Medulloblastoma is more often lateral in site and desmoplastic in histology in adults than in children. On our evidence the age at tumour onset not affect survival.

Adolescent↗