Abstract
Retrograde facilitation (RF) refers to a paradoxical phenomenon in which recall of information presented before acute administration of agents generally associated with anterograde amnestic and sedative effects, such as benzodiazepines, is enhanced relative to a placebo condition. However, it is unclear whether this effect occurs in elderly individuals and if it is influenced by plasma drug levels, baseline cognitive function, or genetic factors such as the APOE e-4 allele, that may modulate drug-induced cognitive toxicity. To determine if acute oral doses of lorazepam (0.5 mg, 1 mg) produced RF in elderly individuals exposed to interference tasks, and the variables associated with RF. Sixty-four cognitively intact and highly educated (>12 years) older adults (mean age, 66.09 years) participated in a placebo-controlled double-blind crossover study. The Buschke Selective Reminding Test was used to assess RF and amnestic effects for verbal memory. Self-ratings of mood states were also obtained. Lorazepam administration resulted in significant dose-dependent RF, i.e., better recall of pre-drug word lists compared to placebo [F(1,63)= 15.358; p<0.001 and F(1,63)= 46.163; p<0.001 for 0.5 and 1 mg lorazepam, respectively]. Also, more...Continue Reading
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