Characteristics of Verbal Memory after Subarachnoid Hemorrhage caused by Ruptured Aneurysm

Abstract

Objective : To clarify the characteristics of memory impairment caused by ruptured aneurysm induced subarachnoid hemorrhage, we examined memory function using the auditory verbal learning test (AVLT). Methods : Subjects were 45 patients with subarachnoid hemorrhage caused by ruptured aneurysm in 14 anterior cerebral arteries (ACA), 12 middle cerebral arteries, 7 vertebrobasilar arteries (VA), and 12 internal cerebral arteries. We discussed the scores of short-term memory (STM), total immediate memory (TIM), verbal learning ability (VLA), retroactive interference effect (RI), recognition and learning curve in different portions of ruptured aneurysm. Additionally, we compared them with healthy subjects (HS). Results : The scores of VLA in ACA were lower than that in HS, and the scores of RI in VA were higher than that in HS. There were no difference in STM, TIM and recognition among groups. The learning curve in ACA and VA were flattening in later trials. Conclusion : Because patients after ruptured subarachnoid hemorrhage in ACA and VA have higher rate of memory impairment, we supposed detailed assessment for memory is important.