Deep Brain Stimulation for Refractory Focal Epilepsy: Unraveling the Insertional Effect up to Five Months Without Stimulation.

INTRODUCTION: Following electrode implantation, a subgroup of patients treated with deep brain stimulation (DBS) for focal epilepsy exhibits a reduction of seizure frequency before stimulation is initiated. Microlesioning of the target structure has been postulated to be the cause of this "insertional" effect (IE). We examined the occurrence and duration of this IE in a group of patients with focal epilepsy following electrode implantation in the anterior nuclei of the thalamus (ANT) and/or nucleus accumbens (NAC) for DBS treatment. MATERIALS AND METHODS: Changes in monthly seizure frequency compared to preoperative baseline were assessed one month (14 patients) and five months (four patients) after electrode implantation. A group analysis between patients with implantation of bilateral ANT-electrodes (four patients), NAC-electrodes (one patient) as well as ANT and NAC-electrodes (nine patients) was performed. RESULTS: In this cohort, seizure frequency decreased one month after electrode implantation by 57.1 ± 30.1%, p ≤ 0.001 (compared to baseline). No significant difference within stimulation target subcohorts was found (p > 0.05). Out of the four patients without stimulation for five months following electrode insertion, three patients showed seizure frequency reduction lasting two to three months, while blinded to their stimulation status. CONCLUSION: An IE might explain seizure frequency reduction in our cohort. This effect seems to be independent of the number of implanted electrodes and of the target itself. The time course of the blinded subgroup of epilepsy patients suggests a peak of the lesional effect at two to three months after electrode insertion.

Symptoms of uterine myomas: data of an epidemiological study in Germany.

PURPOSE: Currently, no reliable data are available concerning the type and frequency of symptoms in premenopausal women with uterine myomas. METHODS: 2296 women were examined by means of vaginal ultrasound for the presence of myomas in seven gynaecological outpatient departments in Germany. From this population, 1314 premenopausal women between the ages of 30 and 55 years were evaluated to determine the type and frequency of myoma-related symptoms and their relationship to anamnestic factors, and the number, size, and location of the myomas. Standardised questionnaires were used to record the symptoms. RESULTS: Prevalence: In almost every second premenopausal woman (n = 639; 48.6%), uterine myomas were diagnosed. The frequency of myomas increased continuously with age and was highest in women between 46 and 50 years (65.2%). Age itself was found to be the main risk factor for the presence of myomas (p < 0.001). SYMPTOMS: 54.3% (n = 347) of the women suffered from myoma-related symptoms. The four main symptoms were identified as: Heavy menstrual bleeding (40.7%), dysmenorrhoea (28.2%), lower abdominal pain (14.9%), and intermenstrual bleeding (14.1%). In the majority of cases, the symptoms occurred simultaneously. Determinants for symptoms: Symptoms did not follow a clear age-related trend, whilst the number and size of the myomas did determine the presence of symptoms. The main influencing factor for the presence of intermenstrual bleeding was the location of the myomas. CONCLUSIONS: The high prevalence of uterine myomas highlights the importance of the diagnosis uterine myomas in standard gynaecological practice: The presence of only one myoma caused symptoms in 46.5% and small myomas of up to 2 cm in diameter resulted in symptoms in 39.5%.

Prevalence of uterine myomas in women in Germany: data of an epidemiological study.

PURPOSE: Currently, no reliable data are available concerning the prevalence of uterine myomas in Germany. In this prospective study, we examined the prevalence of myomas in women older than 30 years by means of vaginal ultrasound. METHODS: 2296 women, who consented to the procedure, were examined by means of vaginal ultrasound for the presence of myomas in seven gynaecological outpatient departments in Germany. PREVALENCE: myomas were detected in 41.6 % of all women. Age dependence: With increasing age, the prevalence of uterine myomas rose from 21.3 % (30-35 years) to 62.8 % (46-50 years). Later, the number of myomas decreased again from 56.1 % (51-55 years) to 29.4 % in women older than 55 years. Menarche/BMI: no correlation could be found between the age at first menstrual period or the body mass index and the occurrence of myomas. Parity: since the group of nulliparous women and the group of women with more than four deliveries stand out by increased occurrence of myomas, a non-linear correlation seems to exist, necessitating more in-depth discussion with regard to age dependency. CONCLUSIONS: The results of this study suggest that more than 40 % of women over 30 years of age suffered from myomas and more than 50 % of all women in Germany may develop uterine myomas at some time in their life.