ASPOFAFF :: Journal - Volume 1 :: Issue 2 :: Vol 1 - Iss 2 - Short Communication - Seasonal variations of admissions rates in Bipolar Disorders


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ASPOFAFF :: Journal - Volume 1 :: Issue 2 :: Vol 1 - Iss 2 - Short Communication - Seasonal variations of admissions rates in Bipolar Disorders

Vol 1 - Iss 2 - Short Communication - Seasonal variations of admissions rates in Bipolar Disorders #20

Seasonal variations of admissions rates in Bipolar Disorders

Parra I, Crivillés S, Real J, García-Parés G, Coronas R, Miguelez M, De-la-Cruz V, Cobo JV:

Mental Health Deparment, Corporació Sanitària Parc Taulí. Parc Taulí s/n. 08208. Sabadell (Spain).

Antecedents: There are several studies about the influence of seasonal periode, light intensity or other enviromental and climatic factors in the outcome of the Bipolar Disorder (BD). Some results are positives, some negatives. In fact, there is an assumption about the influence of latitude and geographical localization in the manifestation of the illness. We present a sample of severe inpatients BD.

Objectives:
1. To describe patterns of seasonal admission frequency in a sample of inpatients BD.
2. To determine the influence of gender and phase factors.

Design and Method: Design: Longitudinal retrospective. Subjects: Inpatients treated in our Unit at Corporació Sanitària Parc Taulí (Sabadell, Barcelona) between may 1997 and may 2003, older than 18 years and with DSM-IV criteria for BD (Type I or II), BD not otherwise specified (NE) or Eschizoaffective Disorder (EAD) Bipolar Type.

Method: Analysis of the “Park Taulí BD database”, determining month of the admission, gender and related factors. The database includes the results of 276 BD: 151 women (54.7 %) / 125 men. All 276 cases represent 505 consecutive hospitalisations (1997-2003): 256 women (50,7 %) / 249 men. Diagnostics: 57.6 % BD-I, 6.5 % BD-II, 33.7 % EAD, 2.2 % BD-NE. Phase: 53.3 % maniac, 30.9 % depressive, 9.1 % mixed, 4.1 % hypomaniac, 2.8 % psychotic.
Statistical analysis: Descriptive (frequency, %) and c2-Test.
Results: The months of spring present the greater frequency of admissions (28.7%) related to the prevision (25%), but not significantly (p=0.135). The maniac phases are more frequent in spring and the depressive phase in winter, but not significantly. All the bipolar sub-types (I, II, EAD) present an excess of admissions in spring, without significant differences among sub-types. Both gender are also prone to admissions in spring, without significant differences.

Conclusions: In our sample, there aren´t significant seasonal variations in the admissions patterns of BD. On the other way, the differents subgroups of BD and the differents phases show differences in the pattern of admission. There is a tendency of descompensations in spring. There aren´t gender difference in seasonal admission rates.

Bibliography: 1. Shapira et al. Admission rates of bipolar depressed patients increase during spring/summer and correlate with maximal environmental temperature. Bipolar Disord 2004 Feb; 6 (1): 90-3.
2. Cassidy et Carroll. Seasonal variation of mixed and pure episodes of bipolar disorder. J Affect Disord 2002 Feb; 68 (1): 25-31.
3. Kerr-Correa et al. Affective disorders, hospital admissions, and seasonal variation of mania in a subtropical area, southern hemisphere. Psychopathology 1998; 31 (5): 265-9.

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