Suicide in subtypes of primary major depression

Suicide in subtypes of primary major depression

Journal of Affectiue Dtsorders. 18 (1990) 221-225 221 Elsevier JAD 00679 Short Communication Suicide in subtypes of primary major depression Z...

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Journal

of Affectiue

Dtsorders.

18 (1990) 221-225

221

Elsevier

JAD 00679

Short Communication

Suicide in subtypes of primary major depression ZoltSln Rihmer t Natmnal

for Neroouc

Institute

‘, Judit Barsi ‘, Mihily and Mental

Diseases, Budapest

Semmelweis

Medical

Untuersrty, (Received

(Revision

Aratb ’ and Erzskbet Demeter

27, P/: 1, 1281 Hungary Budapest.

IX,

iill&

und ’ Department

2

of Forensic Medicrne,

u 93. Hungary

26 July 1988)

received 4 July 1989)

(Accepted

12 July 1989)

Summary

Among 100 consecutive suicide victims with primary major depression at the time of their suicide, 46% were found to have had bipolar II depression, 1% bipolar I disorder and 53% non-bipolar major depression. Since the lifetime prevalence rates of bipolar II and bipolar I depressions are relatively low compared to primary major non-bipolar depression, the present findings suggest that bipolar II disorder gives a particularly high risk of suicide among the different subtypes of primary major affective illness. Fifty-nine percent of the patients had medical contact during the depressive episode, but the depression was frequently undiagnosed, untreated or undertreated. The implications of these findings for suicide prevention are discussed briefly.

Kry

Suicide;

words:

Primary

major depression;

Depression

Introduction

It has been demonstrated that primary affective disorder is associated with a high risk of suicide. In comparisons with unipolar major depression, bipolar depressions have been reported to show increased (Dunner et al., 1976; Morrison, 1982) decreased (McGlashan, 1984; Martin et al., 1985) or similar (Pert% and D’Elia, 1966; Tsuang, 1978; Weeke and Vaeth, 1986) suicide rates.

Address Institute

for correspondence:

for Nervous

Dr. Zoltin

and Mental Diseases,

Rihmer, Budapest

National 27, Pf. 1,

1281 Hungary. 0165-0327/90/$03.50

0 1990 Elsevier Science

Publishers

subtypes;

Medical

contact;

Suicide prevention

Because specific subtypes of primary major affective disorder - unipolar, bipolar II and bipolar I - differ from both a clinical and a research perspective (Dunner et al., 1976; Rihmer, 1980; Rihmer et al., 1982; Endicott et al., 1985) it is logical to assume that each subgroup might have its own suicide risk. Where the subtype of bipolar II depression was not considered separately, this subgroup would probably be included with unipolar depression; thus a very interesting issue might be concealed. Unfortunately, only two studies have examined suicidality in unipolar, bipolar II and bipolar I depression separately (Dunner et al., 1976; Endicott et al., 1985). In both papers, the lifetime

B.V. (Biomedical

Division)

222

history of suicide attempts was highest in bipolar II and lowest in unipolar patients, while the bipolar I subgroup took an intermediate position. Using a different research strategy ~ retrospective psychiatric assessment of suicide completers ~ we also have found that the bipolar ILbipolar II-unipolar distinction may have great importance in suicide mortality. In this paper we report the diagnostic subclassification and some demographic and clinical features of 100 consecutive suicide victims with primary major depression. Method

Two hundred and seventeen consecutive cases of completed suicide in Budapest during the year 1985 were investigated using the life-time version of the Schedule for Affective Disorders and Schizophrenia (SADS; Spitzer and Endicott. 1978). Based on semistructured interviews with the closest family members or friends, the suicide victims were retrospectively classified according to Research Diagnostic Criteria (RDC; Spitzer et al., 1978) if applicable. Data on method of suicide, medical contact, treatment of the recent depression and communication of suicidal intent to family members were also obtained. In three cases the relatives refused to collaborate, and in a further 14 cases the information obtained was not sufficient to make a reliable diagnostic assessment. A detailed clinical analysis of the original sample (n = 200) has been reported previously (Arato et al., 1988). In this report we focus on those persons who had primary major depression at the time of suicide.

TABLE

1

DEMOGRAPHIC FEATURES AND DIAGNOSTIC SUBCLASSIFICATION OF THE 100 PERSONS WITH PRIMARY MAJOR DEPRESSION AT THE TIME OF THEIR SUICIDE Diagnostic subgroup

Number

Mean age (years)

Female Male

:

%of sample

(*SD) Non-bipolar (recurrent unipolar and first episode combined)

53

Bipolar

II

46

Bipolar

I

1

55.7 (16.1) 42.4 (13.6) 50.0

25:28

53

20:26

46

0:I

1

each diagnostic subgroup. Table 3 displays the method of suicide, medical contact during the last depressive episode, drug treatment of the depression. and communication of suicidal intent to family members in the three diagnostic subgroups. Discussion

The main finding of our study is that of the 100 persons with primary major depression at the time of their suicide, nearly half (46%) had bipolar II depression (Table 1). As the lifetime prevalence rates of definite and probable RDC diagnoses of bipolar I. bipolar II and primary major unipolar depressions have been reported to be 0.6%, 0.6%. and 17.2% respectively (Weissman and Myers, 1978), the relatively high rate of bipolar II depression (46%) compared to the other two subtypes in

Results

Of the 200 consecutive suicides (97 females and 103 males) 100 (50%: 45 females and 55 males) had RDC definite or probable primary (unipolar and bipolar) major depression at the time of their suicide. Of the 100 suicides with primary major depression, one person (1%) had bipolar I depression, 46 (46%) had bipolar II depression and 53 (53%) had non-bipolar (recurrent unipolar and first episode combined) depression (Table 1). Table 2 shows the distribution of violent/nonviolent methods of suicide according to sex in

TABLE

2

DISTRIBUTION OF VIOLENT/NON-VIOLENT METHODS OF SUICIDE ACCORDING TO SEX IN EACH DIAGNOSTIC SUBGROUP Non-bipolar

Bipolar

Females (n=45) Males (n = 55)

8/18

5/14

20,‘7

Total

28/25

II

Bipolar

I

Total

O/O

13,‘32

17/10

O/l

37/18

22/24

O/l

so/so

223 TABLE

3

METHOD OF SUICIDE. MEDICAL CONTACT, DRUG TREATMENT OF RECENT DEPRESSION AND TION OF SUICIDAL INTENT TO FAMILY MEMBERS IN THE THREE DIAGNOSTIC SUBGROUPS

Number

of persons

COMMUNICA-

Non-bipolar

Bipolar

53

46

1

100

19 8 1

8 12 2

0 0 0

27 20 3

25

24

1

50

14 19

2 23

0 1

16 43

6 13

11 20

1 0

18 33

10

7

1

18

II

Bipolar

I

Total

Method of suicide Violent Hanging Jumping Other a Non-violent Drug overdose



Medical contact Primary care only Secondary or tertiary Treatment Treatment

care ’

with antidepressants with anxiolytics and/or

Communication

of suicidal

sleeping pills only

intent to family members

a Train. shooting, arterial section. h Including three cases of carbon monoxide poisoning. ’ Secondary care: outpatient psychiatric department; tertiary

care: inpatient

psychiatric

department.

our sample shows a marked overrepresentation and suggests a very high risk of suicide in this subgroup. Unfortunately, no data are available on the prevalence of unipolar, bipolar II and bipolar

sions, it suggests that in Budapest - at least in hospitalized patients - bipolar II depression may be more prevalent then bipolar I disorder, but less frequent than unipolar depression. On the other

I depression in the population of Hungary. For this reason, we have cited the data of Weissman and Myers (1978) from New Haven (CT, U.S.A.), which are, to our knowledge, the only report on the prevalence of unipolar, bipolar II and bipolar I depression in the general population. We can only speculate about the rates of these three subtypes of primary major depression in Hungary, based on a re-analysis of our previous data on hospitalized patients with primary major depression. In our previous work we carried out dexamethasone suppression tests (DST) in 74 consecutively admitted female inpatients with primary major depression (Rihmer and Arato, 1984). Only patients who met the exclusion criteria for the DST were not included, i.e., no diagnostic preselection was made in this study. Of these 74 inpatients, 47% had unipolar depression, 38% had bipolar II depression and 15% had bipolar I disorder (Rihmer and Arato, 1984). Although this sample was not large enough to draw firm conclu-

hand, Endicott et al. (1985) reported from the U.S.A. that among 382 in- and outpatients with primary major depression 53% had unipolar, 15% had bipolar II and 32% had bipolar I depression. This indicates that, at least in a treated sample of primary depressives, in the United States the rate of unipolar depression may be the same, but the ratio of bipolar II to bipolar I disorder may be the opposite of that found in our country. If from these figures we conclude that bipolar II depression is about twice as prevalent in Hungary as in the United States, we may estimate that the frequency of bipolar II disorder is about 1.2% in the general population of Hungary. However, this postulated relatively higher prevalence of bipolar II depression in Hungary does not fully explain our results, and the extreme overrepresentation of bipolar II depression among our suicides might not be simply a reflection of the higher incidence of bipolar II disorder. Our findings are in agreement with previous

224

reports (Dunner et al.. 1976; Endicott et al., 1985) that suicidal behavior is more frequent in bipolar II than in bipolar I and unipolar depression. One possible explanation for this higher incidence of suicidality in the bipolar II subgroup is that these patients have been reported to have a higher comorbidity of alcoholism, personality disorders, migraine headache and (in females) premenstrual dysphoria than bipolar I and unipolar patients (Endicott et al.. 1985). Half of our depressed suicides (50/100 = 50%) chose violent methods, and males did so more frequently (37/55 = 67%) than females (13/45 = 29%) (Table 2). Sixteen patients (16%) had medical contact only at primary care level, while 43 persons (43%) were seen by psychiatrists either at outpatient or at inpatient psychiatric departments during their last depressive episode. Antidepressant pharmacotherapy (imipramine, maprotiline, amitriptyline, dibenzepin) was prescribed for only 18 persons (18%), including only two persons who were on lithium prophylaxis at the time of their suicide. Precise estimation of the dose of prescribed antidepressants was not possible in all cases, but in six patients the daily dose was lower than 125 mg. Thirty-three patients (33%) were treated with anxiolytics and/or sleeping pills only (Table 3). The fact that antidepressants were prescribed for only 18 patients (18%) indicates that in the majority of our depressed suicides the depression was undiagnosed. The facts that half (100/200 = 50%) of our consecutive suicides had primary major depression and that the depression was frequently undiagnosed, untreated or undertreated are similar to the findings of Barraclough et al. (1974) who collected their sample in the U.K. between 1966 and 1967. This extremely high degree of underdiagnosis of depression in Hungary was not completely unexpected, as we have previously shown that the officially registered number of patients with various forms of depression was about half that of the registered number of schizophrenic patients (Rihmer, 1982). In reality, the rate of primary major affective disorder to schizophrenia is clearly the opposite (Glass and Freedman, 1985). Our results support the opinion of Khuri and Akiskal (1983) that undiagnosed and inadequately

treated affective disorders are the leading cause of completed suicide. and that energetic treatment (acute and prophylactic management) of affective disorders might prove to be an effective method of preventing suicide. The number of persons living in Hungary is 10.5 million. About 5000 people kill themselves each year. At least 2500 of these might have primary major depression. The correct diagnosis and treatment of this population may substantially reduce the suicide mortality in Hungary, which is the highest in the world.

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