How should nocturnal enuresis (bedwetting) be evaluated and managed?

Management of Nocturnal Enuresis (Bedwetting)

Start with general lifestyle advice for all children, then choose between enuresis alarm (first-line for motivated families) or desmopressin (first-line for children with nocturnal polyuria), and do not begin active treatment before age 6 years. 1

Initial Evaluation

Mandatory Assessment Components

• History must specifically address: voiding frequency during the day, urgency, holding maneuvers (standing on tiptoe, pressing heel into perineum), interrupted micturition, weak stream, daytime incontinence patterns, and constipation symptoms 1

• Physical examination: Check for enlarged adenoids/tonsils, bladder distention, fecal impaction, genital abnormalities, and examine the back for spinal abnormalities 1

• Only required laboratory test: Urine dipstick (glycosuria requires immediate diabetes mellitus exclusion; proteinuria warrants kidney disease investigation) 1

• Frequency-volume chart: Measure fluid intake and voided volumes for at least 2 days, document enuresis episodes and bowel movements for at least 1 week—this identifies nocturnal polyuria and guides treatment selection 1

Key Distinction

Monosymptomatic enuresis (bedwetting only) versus non-monosymptomatic enuresis (bedwetting plus daytime urgency, frequency, or incontinence) requires different management approaches 2, 3

General Lifestyle Advice (For All Children)

Voiding Schedule

• Void regularly: Morning, twice during school, after school, dinner time, and immediately before sleep 1
• Children who sit to void should use optimal posture to relax pelvic floor muscles 1

Fluid and Diet Management

• Daytime: Liberal water and solute intake, especially morning and early afternoon 1
• Evening restriction: Maximum 200 ml (6 ounces) after dinner, then nothing until morning 1
• Minimize caffeinated beverages before bedtime 1

Constipation Treatment

• Goal: Soft, comfortable bowel movement daily, preferably after breakfast 1
• Polyethylene glycol as stool softener (grade Ia evidence) 1
• Constipation must be treated before starting other therapies as it decreases treatment success 1

Additional Measures

• Encourage physical activity 1
• Keep a calendar of dry/wet nights (has independent therapeutic effect, grade Ib evidence) 1
• Reassure family that bedwetting is neither the child's nor parents' fault 1
• Nighttime awakening by parents is allowed but not needed and only helps that specific night 1

First-Line Treatment Options

Option 1: Enuresis Alarm

Best for: Well-motivated families, children without nocturnal polyuria but with low voided volumes 1

• Success rate: 50-70% initially, with 66% achieving less than one wet night per month 1, 4
• Long-term success: More than half maintain dryness (significantly better than pharmacotherapy) 1
• Relapse rate: 41% (lower than pharmacologic interventions) 5
• Key to success: Written contract, thorough instructions, and enthusiastic presentation improve outcomes 1
• Conditioning is more effective than imipramine and desmopressin in comparative studies 1

Option 2: Desmopressin

Best for: Children with nocturnal polyuria (nighttime urine production >130% of expected bladder capacity) and normal bladder reservoir function (maximum voided volume >70% of expected bladder capacity) 1

Also indicated for: Alarm therapy failures or families unlikely to comply with alarm therapy 1

Dosing and Administration

• Oral tablets: 0.2-0.4 mg taken at least 1 hour before sleep 1
• Oral melt formulation: 120-240 μg taken 30-60 minutes before bedtime 1
• Dose not influenced by body weight or age 1
• Anti-enuretic effect is immediate 1

Efficacy

• 30% full responders, 40% partial responders (grade Ia evidence) 1
• Low curative potential 1
• May reduce wet nights by approximately 1.8 nights per week compared to placebo 6

Critical Safety Warning

• AVOID nasal spray formulation (higher risk of water intoxication; indication removed in many countries) 1
• Contraindication: Polydipsia 1
• Risk: Water intoxication with hyponatremia and convulsions if combined with excessive fluid intake 1
• Strict evening fluid restriction (≤200 ml) is mandatory 1
• Regular drug holidays every 3 months recommended to assess continued need 1

Treatment Algorithm Selection

Strategy 1: Present pros/cons of alarm versus desmopressin and let family choose 1

Strategy 2 (Preferred): Complete frequency-volume chart with nocturnal urine measurements, then:

• Nocturnal polyuria + normal voided volume → Desmopressin 1
• No polyuria or low voided volume → Enuresis alarm 1

If first-line therapy fails: Switch to the alternative first-line option 1

Therapy-Resistant Cases

Second-Line: Anticholinergics

• Indications: Failure of both alarm and desmopressin 1
• Prerequisites: Constipation must be excluded or treated first 1
• Options include oxybutynin, tolterodine, propiverine (availability varies by country) 1
• May be combined with desmopressin 1
• Combining desmopressin with anticholinergics may increase children achieving 14 consecutive dry nights (RR 1.53) 6

Third-Line: Imipramine

Only after anticholinergics fail and all safety issues addressed 1

Critical Safety Requirements

• Cardiotoxicity risk: Potentially fatal in overdose 1
• Must be locked away from younger siblings 1
• Mandatory screening: If history of palpitations, syncope, sudden cardiac death in family, or unstable arrhythmia, exclude long QT syndrome with prolonged ECG before prescribing 1
• Common side effects: mood changes, nausea, insomnia (often appear before benefits) 1

Combination Therapy Considerations

Desmopressin + Alarm:

• May reduce wet nights compared to alarm alone (uncertain evidence) 6
• May increase children achieving 14 consecutive dry nights compared to alarm alone 6
• Consider for therapy-resistant children, especially with nocturnal polyuria 1

Desmopressin + Anticholinergics:

• Probably more effective than desmopressin alone 4, 6
• Faster results compared to monotherapy 4

Special Considerations

Non-Monosymptomatic Enuresis

• Focus on treating daytime bladder symptoms first 2, 3
• Commonly requires anticholinergic medications and urotherapy 3
• May need psychological screening 1

Retry Strategies

• Alarm therapy can be reattempted even if failed 2 years prior—developmental maturation may improve success 1
• When retrying alarm, consider adding desmopressin if nocturnal polyuria present 1

Motivation and Follow-up

• Monthly follow-up with realistic goals sustains motivation and improves outcomes 1
• Child involvement in treatment decisions and bed-changing raises consciousness 1
• Treatment should not begin before age 6 years 1