From: The nosological significance of Folie à Deux: a review of the literature
Diagnosis N (%) | Abnormal thoughts Type, N, (%) | Abnormal perceptions Type, N, (%) | |
---|---|---|---|
1942–1993 | |||
Total N | 54(88.5) | 54 (88.5) | 58 (95.0) |
Primary | Schizophrenia 24 (44.4) | Delusions: | Hallucinations: |
Mood disorders 7 (13.0) | Persecutory 46 (75.4) | Type clearly described 30 (52.6) | |
Delusional disorders 6 (11.1) | Grandiose 8 (13.1) | Not sufficient data 18 (47.4) | |
Secondary | Pure Shared delusional disorder 54 (88.5) | Delusions: | Hallucinations: |
Co-morbidity 48 (89.0): | No difference in type or quality reported. | Same type but less intense quality 17 (29.3) | |
Dementia | Only in the secondary 2 (3%) | ||
Depression | No sufficient data 39 (67.0) | ||
Mental retardation | |||
1993–2005 | |||
Total N | 45 (100) | 53 (87) | 25 (59.5%) |
Primary | Delusional disorder 15 (33.3) | Delusions: | Hallucinations: |
Schizophrenia 13 (28.9) Depression 3 (6.7) Bipolar affective disorder 3 (6.7) Induced delusional disorder 3 (6.7) Mixed affective disorder 1 (2.2) Psychosis (NOS) 1 (2.2) Mixed affective disorder 1(2.2) Mania 1 (2.2) OCD 1 (2.2) Cognitive impairment 1 (2.2) | Persecution 30 (35.3) Grandiose 13 (15.3) Erotomanic 4 (4.7) Somatic 3 (3.5) Infestation 1 (1.2) Capgras' 1 (1.2) Others: Obsessions and compulsions 1 (1.2) | Auditory 11 (45.8) Somatic 5 (20.8) Visual 4 (16.6) Tactile 3 (12.6) Olfactory 1 (4.2) | |
Secondary | Pure Induced delusional disorder 30 (71.4) Co-morbidity 12 (28.6): Schizophrenia 6 (14.3) Depression 3 (7.1) Cognitive impairment 1 (2.4) Bipolar affective disorder 2 (4.8) | Delusions: No difference in type between primaries and secondaries. The intensity of the experiences was also identical in 98% of cases. In the remaining 2% secondary had less intense abnormal thoughts. | Hallucinations: Same type but less intense quality 13 (52.0%) As primary 11 (44.0) Only in secondary 1 (4.0)* |