Riya Wadhwa1, Wei Wen2, Andrew Frankland2, Vivian Leung2, Carina Sinbandhit2, Angela Stuart2, Laughlin Dawes3, Dusan Hadzi-Pavlovic2, Florence Levy4, Rhoshel Lenrootl5, Philip B Mitchell6, Gloria Roberts2. 1. School of Psychiatry, University of New South Wales, Randwick, NSW, Australia. 2. School of Psychiatry, University of New South Wales, Randwick, NSW, Australia; Black Dog Institute, Prince of Wales Hospital, Randwick, NSW, Australia. 3. Medical Imaging Department, Prince of Wales Hospital, Randwick, NSW, Australia. 4. School of Psychiatry, University of New South Wales, Randwick, NSW, Australia; Prince of Wales Hospital, Randwick, NSW, Australia. 5. School of Psychiatry, University of New South Wales, Randwick, NSW, Australia; Neuroscience Research Australia, Sydney, NSW, Australia; University of New Mexico, Albuquerque, New Mexico, United States. 6. School of Psychiatry, University of New South Wales, Randwick, NSW, Australia; Black Dog Institute, Prince of Wales Hospital, Randwick, NSW, Australia; Prince of Wales Hospital, Randwick, NSW, Australia. Electronic address: phil.mitchell@unsw.edu.au.
Abstract
BACKGROUND: Increased white matter hyperintensities (WMHs) is one of the most consistent imaging findings amongst participants with bipolar disorder (BD). This study investigated WMHs in a young population at high genetic risk for bipolar disorder (HR). METHODS: MRI scans were conducted at baseline in HR individuals (n = 131), patients with BD (n = 47) and controls (CON) (n = 108). Most of the HR (n = 77) and CON (n = 74) group completed scans after two years. Scans were examined for the presence of WMHs. RESULTS: There were significantly more periventricular WMHs in the BD compared to the CON group at baseline (p = .04). Although the prevalence of periventricular WMHs was intermediate in the HR group, there were no significant differences between the HR and CON or BD participants. Deep WMHs did not differ significantly between the groups. Over time, there was a significant increase in the prevalence of periventricular WMHs in both the HR and CON groups (p = .02). LIMITATIONS: The use of a visual rating scale to examine WMHs is subjective. As the gradings were collapsed into 'present' or 'absent', we could not ascertain whether the severity of hyperintensities worsened over time. CONCLUSIONS: Periventricular WMHs are more prevalent in young individuals with BD than controls. As these are not more prevalent in HR individuals, it is possible that these are either secondary to the development of bipolar disorder, its treatment, or resulting changes in lifestyle. In a novel finding, there were similar increases in the prevalence of WMHs in controls and HR youth over the 2-year period.
BACKGROUND: Increased white matter hyperintensities (WMHs) is one of the most consistent imaging findings amongst participants with bipolar disorder (BD). This study investigated WMHs in a young population at high genetic risk for bipolar disorder (HR). METHODS: MRI scans were conducted at baseline in HR individuals (n = 131), patients with BD (n = 47) and controls (CON) (n = 108). Most of the HR (n = 77) and CON (n = 74) group completed scans after two years. Scans were examined for the presence of WMHs. RESULTS: There were significantly more periventricular WMHs in the BD compared to the CON group at baseline (p = .04). Although the prevalence of periventricular WMHs was intermediate in the HR group, there were no significant differences between the HR and CON or BD participants. Deep WMHs did not differ significantly between the groups. Over time, there was a significant increase in the prevalence of periventricular WMHs in both the HR and CON groups (p = .02). LIMITATIONS: The use of a visual rating scale to examine WMHs is subjective. As the gradings were collapsed into 'present' or 'absent', we could not ascertain whether the severity of hyperintensities worsened over time. CONCLUSIONS: Periventricular WMHs are more prevalent in young individuals with BD than controls. As these are not more prevalent in HR individuals, it is possible that these are either secondary to the development of bipolar disorder, its treatment, or resulting changes in lifestyle. In a novel finding, there were similar increases in the prevalence of WMHs in controls and HR youth over the 2-year period.
Authors: Meghann C Ryan; L Elliot Hong; Kathryn S Hatch; Si Gao; Shuo Chen; Krystl Haerian; Jingtao Wang; Eric L Goldwaser; Xiaoming Du; Bhim M Adhikari; Heather Bruce; Stephanie Hare; Mark D Kvarta; Neda Jahanshad; Thomas E Nichols; Paul M Thompson; Peter Kochunov Journal: Hum Brain Mapp Date: 2022-02-03 Impact factor: 5.399