Puerperal Psychosis
Puerperal psychosis is a rare but severe psychiatric emergency occurring in 0.1-0.2% of deliveries, typically within the first 2 weeks postpartum, requiring urgent psychiatric admission to a Mother and Baby Unit.
Key Facts
Puerperal psychosis affects 1-2 per 1,000 deliveries (0.1-0.2%) Onset typically within first 2 weeks postpartum (often day 3-7), can be within hours Psychiatric emergency: requires urgent assessment and usually inpatient admission to a Mother and Baby Unit (MBU) Strong association with bipolar affective disorder (25-50% recurrence risk per pregnancy in women with bipolar) Features include confusion, delusions, hallucinations, mania, rapidly fluctuating mood Lithium is first-line mood stabiliser; antipsychotics (olanzapine, haloperidol) for acute psychosis Suicide is a leading cause of maternal death in the UK (MBRRACE-UK reports) Risk of recurrence: 25-57% in subsequent pregnancies; 50% if bipolar disorder diagnosed
Overview
Key Facts
Puerperal (postpartum) psychosis is the most severe form of postnatal mental illness. It is a psychiatric emergency with significant risk to both mother and baby, requiring prompt recognition and specialist treatment.
Epidemiology
- Incidence: 1-2 per 1,000 deliveries
- Onset typically within first 2 weeks postpartum (peak days 3-7)
- Up to 75% of cases in the first 4 weeks
- Suicide is a leading cause of direct maternal death in the UK (MBRRACE-UK)
- Infanticide risk: approximately 4% (uncommon but must be assessed)
Aetiology
- Bipolar affective disorder: strongest risk factor (25-50% recurrence risk per pregnancy)
- Previous puerperal psychosis (recurrence risk 25-57%)
- Family history of puerperal psychosis or bipolar disorder
- Primiparity
- Sleep deprivation
- Caesarean section (possibly through sleep disruption)
- Genetic factors: linkage to chromosome 16 in some families
Pathophysiology
- Exact mechanisms unclear; likely multifactorial
- Rapid postpartum hormonal changes (oestrogen, progesterone withdrawal) trigger episode in genetically vulnerable women
- Hypersensitivity of dopamine receptors in postpartum period
- Sleep deprivation may be a precipitating factor
- Immune system changes postpartum may contribute
- Strong genetic component: first-degree relative with puerperal psychosis increases risk 100-fold
Clinical Presentation
Typical Presentation
- Acute onset within days of delivery (often day 3-7)
- Rapidly fluctuating presentation with lucid intervals
- Confusion and perplexity (distinguishing feature from non-puerperal psychosis)
- Elated or irritable mood (manic features common)
- Delusions (often related to the baby - believing baby is divine, dead, or not theirs)
- Hallucinations (auditory or visual; may include command hallucinations regarding the baby)
- Agitation and bizarre behaviour
- Insomnia (beyond normal newborn sleep disruption)
Red Flags
- Any psychotic symptoms in the postpartum period
- Command hallucinations (particularly regarding the baby)
- Delusional beliefs about the baby
- Suicidal ideation or plans
- Thoughts of harming the baby
- Rapidly escalating symptoms
- Refusal to eat/drink or care for baby
- Previous bipolar or puerperal psychosis
Differential Diagnosis
| Diagnosis | Key Features | Investigation |
|---|---|---|
| Severe postnatal depression with psychotic features | Predominantly low mood with psychotic features | EPDS, psychiatric assessment |
| Bipolar disorder (manic episode) | History of bipolar, predominantly manic features | Psychiatric history |
| Delirium (organic cause) | Infection, metabolic disturbance, medications | FBC, U&Es, TFTs, cultures, CT head |
| Thyroid storm | Tachycardia, fever, agitation, thyroid history | TFTs |
| Eclampsia | Seizures, hypertension, proteinuria | BP, urinalysis, bloods |
| Substance misuse | Drug history, toxicology | Urine drug screen |
| Autoimmune encephalitis (anti-NMDA receptor) | New psychiatric symptoms, seizures, movement disorder | CSF antibodies, MRI |
Diagnosis / Investigation
Bedside
- Comprehensive mental state examination
- Risk assessment (suicide, infanticide, self-neglect)
- Physical examination (exclude organic causes)
- Vital signs including temperature
- Urinalysis
Bloods
- FBC, CRP (exclude infection/sepsis)
- U&Es, calcium (metabolic derangement)
- TFTs (thyroid dysfunction common postpartum)
- LFTs
- Blood glucose
- Blood cultures if pyrexial
- Urine drug screen
Imaging
- CT/MRI head if diagnostic uncertainty or focal neurology
- Not routinely required if classic presentation
Special Tests
- Electroencephalogram (EEG) if seizures suspected
- Autoimmune encephalitis antibodies if atypical presentation
- Lumbar puncture if meningitis/encephalitis suspected
Management
Non-pharmacological
- Urgent psychiatric assessment (ideally by specialist perinatal mental health team)
- Admission to Mother and Baby Unit (MBU): preferred setting (keeps mother and baby together with specialist supervision)
- If MBU unavailable: general psychiatric ward with arrangements for supervised baby contact
- One-to-one nursing observation
- Ensure baby safety (supervised contact, risk assessment)
- Involve partner/family in care plan
- Practical support with infant care
Pharmacological
- Antipsychotics (acute psychosis):
- Olanzapine 5-20mg OD (sedating, caution with breastfeeding)
- Haloperidol 2-10mg PO/IM (if breastfeeding preferred; lower milk transfer)
- Quetiapine 25-800mg OD (alternative)
- Mood stabilisers:
- Lithium (first-line for relapse prevention and acute treatment of manic symptoms; contraindicated in breastfeeding)
- Valproate (AVOID in women of childbearing potential - teratogenic)
- Benzodiazepines: short-term for agitation and insomnia (e.g., lorazepam 1-2mg PO/IM)
- Electroconvulsive therapy (ECT): effective for severe cases, rapid response, safe in postpartum period
Surgical/Interventional
- ECT: considered for severe, treatment-resistant cases; particularly effective for puerperal psychosis
Referral Criteria
- All cases: urgent referral to specialist perinatal mental health team
- MBU admission (national bed finder service available)
- If no MBU bed: general psychiatric admission with safeguarding plan for baby
- Community perinatal team for follow-up after discharge
- Preconception counselling for future pregnancies
- Genetic counselling if family history suggestive
Prognosis
- Majority recover fully from the acute episode (over weeks to months)
- Average inpatient stay: 6-8 weeks
- ECT provides rapid improvement in many cases
- Recurrence risk: 25-57% in subsequent pregnancies; higher (up to 50%) if underlying bipolar disorder
- 50% of women with puerperal psychosis are later diagnosed with bipolar affective disorder
- Risk of non-puerperal psychiatric episodes: 70-80% over lifetime
- With prophylactic treatment (lithium from third trimester/immediately postpartum): recurrence risk reduced to 10-20%
- Mother-infant bonding usually recovers fully with appropriate support
- Infanticide: rare (~4%) but must be actively risk-assessed
Other Relevant Information
Comparison of Postnatal Mental Health Conditions
| Feature | Baby Blues | PND | Puerperal Psychosis |
|---|---|---|---|
| Incidence | 50-80% | 10-15% | 0.1-0.2% |
| Onset | Day 3-5 | Weeks-months | Day 1-14 |
| Duration | <2 weeks | Weeks-months | Weeks (acute) |
| Key features | Tearfulness, lability | Low mood, anhedonia | Delusions, hallucinations, mania |
| Risk to baby | None | Impaired bonding | Potential harm |
| Treatment | Reassurance | CBT, SSRI | MBU, antipsychotics, lithium, ECT |
Prevention in High-Risk Women
| Risk Factor | Strategy |
|---|---|
| Previous puerperal psychosis | Preconception planning, lithium prophylaxis from 36 weeks or delivery |
| Bipolar disorder | Continue/start mood stabiliser, close perinatal monitoring |
| Family history | Specialist perinatal mental health input antenatally |