Nocturnal enuresis

Nocturnal enuresis refers to involuntary urination during sleep in children aged 5 years or older, occurring at a developmental stage when bladder control is expected. It is a common paediatric condition and is usually benign, with spontaneous resolution in many children as neurological and bladder maturation progresses.

Nocturnal enuresis is classified into:

• Primary nocturnal enuresis – child has never achieved sustained nighttime dryness.

• Secondary nocturnal enuresis – recurrence of bedwetting after at least 6 months of dryness, often suggesting underlying medical or psychological causes.

It is essential to differentiate nocturnal enuresis from daytime enuresis, which may indicate bladder dysfunction or neurological disease.

Secondary causes include:

• Diabetes mellitus

• Urinary tract infection

• Chronic kidney disease

• Constipation

• Physical or emotional stress or trauma

All patients require clinical evaluation and urine examination to exclude organic pathology.

Risk Factors

Biological Factors

• Delayed bladder maturation

• Reduced nocturnal antidiuretic hormone (ADH) secretion

• Small functional bladder capacity

• Deep sleep pattern

• Genetic predisposition (positive family history)

Medical Conditions

• Urinary tract infection

• Diabetes mellitus

• Chronic constipation

• Sleep disorders (e.g., obstructive sleep apnea)

• Neurodevelopmental disorders

Psychosocial Factors

• Emotional stress

• Family conflict

• School difficulties

• Major life changes (new sibling, relocation)

Signs and Symptoms

Typical Features

• Bedwetting during sleep

• Normal daytime continence (primary nocturnal type)

• Difficulty awakening when bladder is full

Associated Symptoms Suggesting Secondary Cause

• Daytime urinary frequency or urgency

• Dysuria

• Polyuria or polydipsia

• Constipation

• Behavioural or emotional changes

• Poor growth or weight loss

Diagnostic Criteria

Diagnosis is clinical and includes:

• Age ≥ 5 years

• Recurrent involuntary nighttime urination

• Occurring at least twice weekly for ≥ 3 monthsOR causing significant distress or social impairment

• Absence of congenital or neurological urinary tract abnormalities

Classification should determine:

• Primary vs secondary enuresis

• Monosymptomatic vs non-monosymptomatic enuresis

Investigations

Mandatory Investigation

• Urinalysis (all patients)

  • Infection

  • Glycosuria

  • Proteinuria

  • Haematuria

Additional Tests (If Indicated)

• Urine culture

• Blood glucose level

• Renal function tests

• Ultrasound kidney–ureter–bladder

• Post-void residual urine measurement

Further evaluation is required when:

• Daytime symptoms exist

• Recurrent infections occur

• Poor treatment response is noted

Management

Management depends on child age, severity, and psychosocial impact.

First-line treatment is education and behavioural therapy.

Non-Pharmacological Management

Counseling and Reassurance

• Explain that enuresis is common and not intentional.

• Avoid punishment or blame.

• Encourage family support.

Behavioural Measures

• Regular daytime voiding schedule

• Void before bedtime

• Limit excessive evening fluids

• Avoid caffeine-containing drinks

• Treat constipation if present

Motivational Therapy

• Reward systems (dry night charts)

• Positive reinforcement

Enuresis Alarm Therapy

• Most effective long-term treatment

• Conditions child to awaken when bladder is full

• Recommended for motivated families

Psychological Support

• Psychotherapy when emotional stress is suspected

Pharmacological Management

Medication is considered when:

• Behavioural therapy fails

• Significant psychological distress exists

• Short-term dryness is required (e.g., school camps)

1. Imipramine

• Imipramine 25 mg orally at night

• Duration: 1 month trial

⚠ Monitor for:

• Cardiotoxicity

• Mood changes

• Overdose risk

Use cautiously and avoid unsupervised access.

2. Oxybutynin

Indicated when bladder overactivity is suspected.

• Oxybutynin 5 mg orally every 8 hours for 1 month

Possible side effects:

• Dry mouth

• Constipation

• Facial flushing

(Note: Desmopressin is widely used internationally where available.)

Referral Indications

Refer to specialist if:

• Suspected systemic illness

• Chronic kidney disease

• Daytime (diurnal) enuresis

• Recurrent urinary tract infections

• Neurological abnormalities

• Failure of primary treatment

• Secondary enuresis without clear cause

Referral options:

• Paediatrician

• Paediatric nephrologist

• Urologist

Complications

Although medically benign, untreated enuresis may cause:

• Low self-esteem

• Social withdrawal

• Anxiety

• Family stress

• School avoidance

Prevention

• Early toilet training support

• Adequate hydration habits

• Management of constipation

• Early treatment of urinary infections

• Emotional support during stressful life events

• Routine paediatric follow-up

Patient and Parent Education

Parents should understand:

• Bedwetting is not laziness or misconduct.

• Most children outgrow the condition naturally.

• Punishment worsens outcomes.

• Consistency in behavioural strategies improves success.

• Medical review is needed if daytime symptoms develop.

Prognosis

Spontaneous annual resolution occurs in approximately 15% of affected children. Prognosis is excellent, especially in primary monosymptomatic nocturnal enuresis.