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The Effect of Leukoaraiosis on the Severity and Course of Delirium

백질변성이 섬망의 심각도 및 경과에 미치는 영향

  • Choi, Won-Jung (Institute of Behavioral Science in Medicine, Yonsei University College of Medicine) ;
  • Seok, Jeong-Ho (Institute of Behavioral Science in Medicine, Yonsei University College of Medicine) ;
  • Oh, Seung-Taek (Institute of Behavioral Science in Medicine, Yonsei University College of Medicine) ;
  • Chung, Tae-Sub (Department of Radiology, Yonsei University College of Medicine) ;
  • Kim, Jae-Jin (Institute of Behavioral Science in Medicine, Yonsei University College of Medicine)
  • 최원정 (연세대학교 의과대학 의학행동과학연구소) ;
  • 석정호 (연세대학교 의과대학 의학행동과학연구소) ;
  • 오승택 (연세대학교 의과대학 의학행동과학연구소) ;
  • 정태섭 (연세대학교 의과대학 영상의학교실) ;
  • 김재진 (연세대학교 의과대학 의학행동과학연구소)
  • Received : 2018.11.19
  • Accepted : 2018.12.13
  • Published : 2018.12.31

Abstract

Objectives : The significance of leukoaraiosis on brain magnetic resonance imaging (MRI) is uncertain, but it is often seen with vascular risk factors or in the context of cognitive impairment. We aimed to investigate the effect of leukoaraiosis on the severity and course of delirium. Methods : Periventricular hyperintensity and deep white matter hyperintensity on brain MRI were rated in 42 patients with delirium by semiquantative visual rating scale. Correlations between their grades and the scores of Korean version of Delirium Rating Scale-Revised-98 (K-DRS-R-98) were analyzed, and the interaction effects between the groups according to the levels of leukoaraiosis and two evaluation points were also analyzed. Results : The grade of deep white matter hyperintensity in the occipital lobe was positively correlated with the scores on the total, severity items, cognitive items, and non-cognitive items of K-DRS-R-98. The cognitive items scores of K-DRS-R-98 in the low grade group of periventricular hyperintensity showed significantly steeper decrease than the high grade group. Conclusions : A difference in severity or recovery speed of delirium according to the level of leukoaraiosis may result from disruption in brain functional connectivity. Our results have a clinical implication in that the severity and course of delirium can be possibly predicted using the level of leukoaraiosis.

연구목적 뇌 자기공명영상에서 발견된 백질변성의 소견은 인지기능 저하와 관련이 있다고 알려져 있지만 이의 중요성은 명확하게 밝혀진 바 없다. 본 연구는 뇌 자기공명영상에서 관찰되는 백질변성이 섬망의 심각도나 경과에 미치는 영향을 규명하기 위해 시행되었다. 방 법 섬망 삽화 전후에 뇌 자기공명영상이 촬영된 42명의 섬망 환자에 대하여 반정량적인 시각평가척도를 이용하여 뇌실주위 백질 고강도신호와 심부백질 고강도신호를 평가하였다. 이 고강도신호의 등급과 섬망평가척도 점수 간의 상관 관계를 분석하였고, 등급이 높은 군과 낮은 군으로 나누어 군에 따른 섬망평가척도 점수의 변화 차이를 추가로 분석하였다. 결 과 후두엽의 심부백질 고강도신호 등급과 섬망평가척도의 총점, 심각도 항목, 인지 항목 및 비인지 항목의 합과 양의 상관관계를 보였다. 또한 첫 평가와 추적 평가를 비교하였을 때 뇌실주위 백질 고강도신호의 등급이 낮은 군이 높은 군보다 섬망평가척도의 인지 항목 점수가 유의미한 경사로 가파르게 감소하였다. 결 론 뇌 백질 고강도신호 등급에 따라 섬망의 심각도와 호전 속도에 차이를 보이는 것은 뇌 백질변성이 대뇌 기능 연결성의 단절을 초래하여 유발한 결과로 볼 수 있다. 본 연구는 뇌 자기공명영상에서 발견된 고강도신호의 등급의 평가를 통해 섬망의 심각도와 경과를 예측해 볼 가능성이 있다는 점에서 임상적으로 유용할 수 있다.

Keywords

JSSCBG_2018_v26n2_194_f0001.png 이미지

Fig. 1. Changes of the sum of cognitive items in the low grade (≤ 3) and high grade (>3) groups according to the total grade scores of periventricular hyperintensity. * : p<0.05 for interaction between group and visit in repeated-measures analysis of variance.

Table 1. Subject clinical characteristics on Visit 1.

JSSCBG_2018_v26n2_194_t0001.png 이미지

Table 2. Correlations between the level of deep white matter hyperintensity (DWMH) in the occipital lobe and scores of Korean version of the Delirium Rating Scale-Revised-98 (K-DRS-R-98) on Visit 1

JSSCBG_2018_v26n2_194_t0002.png 이미지

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