Espen Benjaminsen

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A remarkable increase in female to male ratio of multiple sclerosis (MS) is recognised in high incidence areas. Norway is a high-risk area for MS, spanning latitudes 58–71°N. We studied whether the sex ratio has changed over time and whether it differs by clinical phenotype or by latitude. Population-based epidemiological data and data from the Norwegian MS(More)
BACKGROUND Synesthesia is, as visual migraine aura, a common and fascinating perceptual phenomenon. Here we present a unique case with synesthesias exclusively during visual migraine auras. CASE PRESENTATION A 40-year-old woman with a cyclic mood disorder had suffered from migraine with visual aura for several years. On several occasions she had(More)
OBJECTIVE We aimed to determine if the risk of Multiple Sclerosis (MS) is associated with month of birth in Norway and to explore a possible latitudinal gradient. METHODS All patients with MS born between 1930 and 1979 registered in the Norwegian MS Registry or ascertained in Norwegian prevalence studies were included (n = 6649). The latitude gradient was(More)
A month of birth effect on multiple sclerosis (MS) risk has been reported from different countries. Recent critics have suggested that this finding is caused by confounding and that adequately adjusting for year and place of birth would markedly reduce this effect. All inhabitants in Norway are registered in the Norwegian Population Registry (Statistics(More)
The ovarian activity in 33 primiparous and 52 pluriparous post weaning sows was studied by progesterone determination. The progesterone profiles revealed that 90.4 per cent of the pluriparous and 66.7 per cent of the primiparous sows had resumed ovarian activity within 10 days. Ovulation within 10 days with overt oestrus occurred in 45.5 per cent of the(More)
BACKGROUND The risk of multiple sclerosis (MS) increases with increasing latitude. Taking into consideration that Norway has a large latitude range, a south-to-north gradient would be expected. However, previous studies have reported an uneven distribution of the disease in Norway, with a relatively low prevalence in the most northern parts of the country.(More)
Sixtyfour mares were examined 3 and 6 weeks after mating. Progesterone was measured in 22 mares 3 weeks after mating in order to see if this could be of any help in the oestrous diagnosis. None of the pregnant mares had plasma progesterone below 2 ng/ml. Pregnant mares that did not show oestrus had higher levels of plasma progesterone than pregnant mares(More)
Forty-seven heifers with the diagnosis anoestrus were treated with 15 mg to 60 mg megestrolacetat (Niagestin "NOVO") per os for 10 days. Thirty heifers showed oestrus within 10 days after treatment and 56% of these conceived after first insemination. There was no significant difference in fertility after different doses of megestrolacetat. Ten cycling(More)
Ovarian function and carbohydrate status were examined in 286 dairy cows. The cows, which were at various stages of the postpartum period, had their ovaries examined by one rectal palpation. Simultaneously with the clinical examination, one blood sample was taken for determination of progesterone, glucose and acetoacetate. In the period before 24 days post(More)