Analysis of cerebral lobar microbleeds and a decreased cerebral blood flow in a memory clinic setting

Hikaru Doi, Saeko Inamizu, Ban Yu Saito, Hiroyuki Murai, Takehisa Araki, Jun Ichi Kira

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Objective Cerebral microbleeds (MBs) have been previously associated with cognitive dysfunction, including Alzheimer’s disease. In the present study, we aimed to clarify the relationship between cerebral lobar MBs and the regional cerebral blood flow (CBF). Methods We investigated the data obtained from 122 patients in our memory clinic who were examined by both MRI and 99mTc-ethyl cysteinate dimer (ECD)-single photon emission computed tomography (SPECT). Patient brain scans were superimposed and brain regions containing both decreased CBF and MBs were visually identified. For each patient eight brain regions were evaluated, comprising the right and left frontal, temporal, parietal, and occipital lobes. Results Cerebral MBs were detected in 36 of the 122 (29.5%) patients. Of these 36 patients, 23 had detectable lobar MBs, which were primarily distributed in the occipital lobe in 19 of the 46 (41.3%) regions with lobar MBs. The frequency of MBs accompanied by a decreased CBF in the parietal and occipital lobes was significantly higher than that observed in the frontal lobe (73.3% vs. 27.3%, p<0.05, and 73.7% vs. 27.3%, p <0.05, respectively). Additionally, a decreased CBF was observed significantly more frequently in the brain regions with 5 or more MBs compared to the regions with one microbleed (83.3 vs. 25.0%, p<0.0005). Among the 17 patients with observable MBs accompanied by a decreased CBF, none were initially diagnosed with either subjective complaints or mild cognitive impairment. Conclusion We determined that the cerebral lobar MBs located in the parietal and occipital lobes, and the lobar regions with a large number of MBs, were significantly more likely to be accompanied by a decreased CBF.

Original languageEnglish
Pages (from-to)1027-1033
Number of pages7
JournalInternal Medicine
Volume54
Issue number9
DOIs
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Internal Medicine

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