Seasonality of manic depressive illness in Canada.

OBJECTIVE: The objective of the study was to determine if a seasonal pattern existed for hospital admissions of manic depressive illness to a Ontario provincial psychiatric hospital. METHOD: Admission records were reviewed for the 75 year period of the study. In the analysis factors including: mood state on admission, gender and the influence of psychotropic medications were considered. RESULTS: For mania and depression there was no statistically significant seasonal pattern of admissions. For mixed state admissions peaked in the summer. CONCLUSIONS: The results of this study contradict the seasonal pattern traditionally reported in the literature. The limitations of this study, which include changes in diagnostic criteria over time and admission date not identical to onset of affective episode, need to be acknowledged.

A closer look at inpatient suicide.

BACKGROUND: We examined the risk factors for suicide among inpatients in an Ontario provincial psychiatric hospital. METHODS: Forty-four inpatients who had committed suicide during their hospital stay from 1969 to 1995 were compared with a group of inpatient controls matched for sex, age and date of admission. The diagnosis for each patient was reviewed by the authors. RESULTS: Suicide victims were more likely to have had a mood disorder, family history of psychiatric problems, mention of suicide risk in chart notes and a previous suicide attempt. Two findings necessitated further scrutiny: The most common diagnosis among inpatients who committed suicide in this study was a mood disorder and not schizophrenia as previously reported. A large proportion of patients (24) had experienced a rapidly fluctuating clinical course prior to the time of suicide. CONCLUSIONS: The implications of these findings, including the possible role of antidepressants in the induction of cycling prior to suicide, are discussed.

Treatment of bipolar depression: a survey of Canadian psychiatrists.

OBJECTIVE: This study was conducted to examine how Canadian psychiatrists manage bipolar depression. METHOD: A questionnaire specific to the treatment of bipolar depression was mailed to 1639 active members of the Canadian Psychiatric Association. RESULTS: Seven hundred and sixty-six completed questionnaires were returned (46.7%). Most psychiatrists indicated that a combination of psychotherapy and somatic therapy was their preferred approach. For bipolar disorder, depressed, lithium carbonate and selective serotonin reuptake inhibitors (SSRIs) were the preferred treatment strategies. For substitution, tricyclic antidepressants (TCAs) were the favoured choice. Lithium carbonate was the preferred choice for augmentation and, addition. CONCLUSION: These findings indicate that a combination of psychotherapy and somatic therapy is the preferred treatment approach for bipolar depression. Lithium carbonate and SSRIs are the favoured somatic therapies.

A nongenetic basis of cycle frequency in bipolar disorder: study of a monozygotic twin pair.

The authors describe a pair of monozygotic twins with bipolar disorder but with a different course of the illness including age of onset, sequence of episodes, and cycle length. Based on these findings, the clinical course of bipolar illness does not appear to be genetically determined.

The phenomenon of rapid cycling in bipolar mood disorders: a review.

OBJECTIVE: To review the various pharmacological and nonpharmacological factors associated with the induction of rapid cycling in bipolar mood disorder, and to introduce the idea that parturition may also have a role. Factors known to contribute to bipolar mood disorder rapid cycling include antidepressant agents, female gender and middle age. Currently, there is evidence that hypothyroidism may also play a role. METHOD: A critical review of the literature was undertaken. CONCLUSION: Caution should be exercised in the use of antidepressants in patients with bipolar mood disorders.

A comparison of comorbid patterns in treatment-resistant unipolar and bipolar depression.

OBJECTIVE: To examine the occurrence of concomitant psychiatric disorders in patients with treatment-resistant unipolar and bipolar depression. METHOD: Forty-nine patients participated as subjects. Twenty-four (49%) had unipolar depression and 25 (51%) had bipolar depression using DSM-III-R criteria. Structured clinical interviews were conducted with all patients. Chart reviews and interviews with family members were also carried out. Information relating to both current and lifetime diagnoses was obtained. RESULTS: Of the entire sample, 75.5% were found to have at least one other Axis I diagnosis and 46.9% had at least two additional Axis I diagnoses. The unipolar group had significantly more current comorbid diagnoses. When type of diagnoses was examined, unipolar patients had significantly more anxiety diagnoses at the time of the index episode, and over their entire lifetime. Bipolar patients had significantly more lifetime substance abuse diagnoses. CONCLUSIONS: Axis I comorbidity appears to be differentially associated with treatment resistance in unipolar and bipolar depression.

Development and validation of a scale for rating mood states of psychiatric inpatients.

OBJECTIVE: The authors assessed reliability and validity of a scale developed for use with inpatients on a mood disorders unit. The scale is used to rate a patient's mood along a quantitative continuum from -5, depressive stupor, through 0, euthymic, to 5, full mania. The scale lists behaviors that constitute criteria for each rating point. Mixed states and idiosyncratic behavior can also be assessed. METHODS: Assessment of the scale's reliability and validity was based on data for 53 psychiatric inpatients. The scale's reliability was assessed by comparing nurses' ratings. Validity was assessed by comparing nurses' ratings with patients' self-ratings using previously validated self-report instruments as well as a patient self-report version of the scale. RESULTS: Interrater reliability for the instrument was high (r = .84). Estimates of validity obtained using patient self-report measures ranged from .54 to .85. CONCLUSIONS: The psychometric properties of the scale are comparable to and in some cases are superior to those reported for instruments that include more items and that take longer to complete.