Three sisters covering the transient global amnesia spectrum

Extract

We report the case of an Italian family in which three sisters experienced transient global amnesia (TGA). Since its early description, this transitory pure memory deficit has attracted increasing interest, especially within the neurological community. In 1964 the term “TGA” was coined to identify the abrupt onset of anterograde amnesia, accompanied by repetitive queries lasting for hours and then gradually recovering, leaving an amnesic gap for the duration of the attack. Afterwards, many studies focused on TGA, and in 1990 clinical criteria were defined by Hodges and Warlow (1990). Further studies showed that meeting diagnostic criteria was a significant predictor for a better outcome than in other forms of transient amnesia, while amnesic patients who did not fulfil the TGA criteria had different outcomes. Precipitating and trigger events for TGA were identified and divided into physical and psychological factors (Inzitari et al., 1997; Quinette et al., 2006). Physical precipitants were found to be gardening, housework and sawing wood, contact with water and changes in body temperature occurring during hot baths or showers, or a cold swim at the swimming pool. Emotional trigger events included a major life or death event, emotional stress triggered by a gastric endoscopy, an exhausting work session, and anxiety resulting from conflicts at home or at work, health problems and money worries. Several hypotheses have been proposed for its pathogenesis such as psychogenic, venous dysfunction due to jugular venous valve incompetence, or ischemic aetiology, but the enigma of TGA still needs to be unravelled (Lewis, 1998; Akkawi et al., 2001).