2014
DOI: 10.1016/j.jad.2014.07.002
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Seasonality and bipolar disorder: A systematic review, from admission rates to seasonality of symptoms

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Cited by 182 publications
(166 citation statements)
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“…Very few studies have also reported that mixed episodes may show a seasonal pattern as well. 8 Looking at which episode type occurred in what proportion (by percentage) in each patient in our study, we see that there were significantly more mixed episodes in patients with seasonal patterns, and the number of mixed episodes tended to be larger. Although no separate recording of seasonal pattern by episode type was attempted, these results suggest that mixed episodes may also be associated with seasonality.…”
Section: Discussionmentioning
confidence: 64%
See 1 more Smart Citation
“…Very few studies have also reported that mixed episodes may show a seasonal pattern as well. 8 Looking at which episode type occurred in what proportion (by percentage) in each patient in our study, we see that there were significantly more mixed episodes in patients with seasonal patterns, and the number of mixed episodes tended to be larger. Although no separate recording of seasonal pattern by episode type was attempted, these results suggest that mixed episodes may also be associated with seasonality.…”
Section: Discussionmentioning
confidence: 64%
“…7 However, there are no significant results showing that environmental factors such as exposure to daylight are associated with seasonal patterns. 8 It has also been reported that patients with bipolar depression can heal more quickly in rooms receiving more sunlight. 9 Some studies have also reported that seasonal patterns are seen more often in the bipolar II subtype and women, and the dominant episodes and first episodes of these patients are more likely to be of a depressive type.…”
Section: Introductionmentioning
confidence: 99%
“…In spring/summer, high hospitalization rates for manic episode (as principal reason for involuntary admission) are well stated, due to an increase in total sunshine hours and length of the average monthly days (Wang & Chen 2013;Abreu & Braganca 2015;Hochman et al 2016). Other studies showed, in addition to the main peak in spring/summer, a lower frequency of manic involuntary admissions in autumn (Cassidy & Carroll 2002;Lee et al 2002;Morken et al 2002;Volpe and Del Porto 2006;Lee et al 2007;Volpe et al 2010;Yang et al 2013;Geoffroy et al 2014). Furthermore, patients with bipolar disorder and seasonal-affective disorder have a higher light sensitivity compared to healthy controls and patients affected by major depressive disorder, as a result of melatoninergic, serotoninergic and dopaminergic neurotransmissions (Nathan et al 1999;Quera Salva et al 2011).…”
Section: Discussionmentioning
confidence: 95%
“…On the other hand, some studies have considered bipolar disorder, especially mixed and manic episodes, as one of the main diagnosis related to the involuntary admission (Lee et al 2007;Schuepbach et al 2008;Amr & Volpe 2012). Irregular chronobiology in terms of disrupted sleep and dysregulation of circadian rhythms with a greater seasonal fluctuations in mood and behaviour is a characteristic pattern of bipolar patients compared to unipolar depression patients or healthy controls (Geoffroy et al 2014). Patients suffering from manic episode have higher rates of admission during spring and summer (Lee et al 2007;Volpe et al 2010;Amr & Volpe 2012;Wang & Chen 2013;Hochman et al 2016).…”
Section: Objectivementioning
confidence: 99%
“…Numerous studies have investigated diurnal, weekly, or seasonal variations in the onset of different diseases, such as cardiovascular diseases [7,[22][23][24] , cerebrovascular diseases [25,26] , and psychiatric disorders [27][28][29] , as well as complicated (including hemorrhage and perforation) and uncomplicated PUs [8][9][10][11] , for which the highest incidences are in winter. This seasonal fluctuation of PU may be affected by several factors, including climatic factors [30] , increased intake of NSAIDs in winter [31] , significantly increased number of H. pylori infections in winter [32] , and variations in alcohol consumption [33] .…”
Section: Discussionmentioning
confidence: 99%