11/25/2023 0 Comments Seeing zigzag linesIt is also often clinically challenging to differentiate MA from other conditions, particularly transient ischemic attacks and occipital epilepsy. MA is associated with an increased risk of ischemic stroke, atrial fibrillation, and patent foramen ovale. An accurate description of the clinical features, in combination with investigations such as neuroimaging, is necessary to provide a better understanding of the underlying mechanisms.Įven more importantly, there are serious clinical issues related to MA that call for improved characterisation of the individual features. While MA is likely caused by cortical spreading depression, a transient wave of neuronal depolarization of the cortex, there is currently no pathophysiological explanation for the marked heterogeneity of visual symptoms. Several studies have investigated the clinical features of VASs but so far there is no consensus regarding which different types of EVSs occur during MA and there is no agreement on the terminology that should be used to describe EVSs. Viana and colleagues previously observed that these visual phenomena could be effectively defined by subdividing the perceived visual scenarios into so-called elementary visual symptoms (EVS), such as zigzag lines, crescent shapes, and flickering lights. In clinical studies of VAS, patients have reported a plethora of different, often complex, visual disturbances. In addition to being the most common aura symptoms, VASs are also the most multifaceted. Visual aura symptoms (VASs) are by far the most common and occur in 98–99% of MAs, whereas disturbances of sensation and language occur in 36% and 10% of auras, respectively. Typical migraine aura (MA) symptoms are completely reversible visual, sensory, or language disturbances. Migraine with typical aura is a highly prevalent disorder as it affects 8% of the general population.
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