Congenital rubella syndrome: anesthesia implications

1. Cardiovascular

• Define the cardiac lesions fully on recent echocardiography:
  • PDA size, shunt direction and magnitude
  • LV size/function and pulmonary overcirculation
  • Pulmonary artery pressures and pulmonary vascular resistance
  • Branch pulmonary artery stenosis, which is characteristic of CRS
  • Other associated congenital lesions
• Longstanding PDA may cause pulmonary hypertension. Avoid hypoxemia, hypercapnia, acidosis, hypothermia, high airway pressures, and sympathetic surges, all of which can increase PVR and may precipitate shunt reversal if pulmonary vascular disease is advanced.
• Preserve preload, myocardial contractility, and stable systemic vascular resistance. Sudden major changes in PVR are undesirable during PDA management. PDA anesthetic goals
• For device closure, anticipate potential acute hemodynamic changes following abolition of the left-to-right shunt. Monitor for reduced LV preload, altered ventricular loading, arrhythmia, device embolization or obstruction, and pulmonary hypertensive events where relevant.
• Meticulous air elimination from IV lines is appropriate in congenital heart disease, particularly if bidirectional/right-to-left shunting is possible.

2. Respiratory

• Assess for current or recent URTI, wheeze, reactive airway disease, chronic aspiration, impaired cough, and baseline oxygen saturation.
• If there is active wheeze or uncontrolled bronchospasm, optimize first when the procedure is elective. Poor control or wheeze at induction increases perioperative respiratory risk. Morgan and Mikhail’s Clinical Anesthesiology, p. 991.
• Ensure adequate depth before airway manipulation. Airway instrumentation is a frequent precipitant of reflex bronchospasm.
• A bronchodilator-friendly technique is reasonable in a child with reactive airways:
  • Continue prescribed inhaled therapy.
  • Consider pre-procedure inhaled beta-2 agonist when clinically indicated.
  • Avoid airway-irritating stimulation and avoid desflurane in a reactive airway.
  • Sevoflurane has bronchodilating properties; volatile anesthetics other than desflurane can reduce airway resistance. Miller’s Anesthesia, p. 2076.
• If bronchospasm occurs intraoperatively, exclude common mechanical and cardiopulmonary mimics first: tube kink/obstruction, endobronchial intubation, circuit obstruction, secretions, aspiration, pulmonary edema, pneumothorax, and anaphylaxis.

3. Eye, hearing, and neurologic implications

• Cataract/glaucoma/retinopathy: protect the eyes carefully during transfer and positioning. Record baseline visual impairment where possible.
• Hearing impairment: communication may be difficult. Use visual interaction, caregiver input, and clear recovery-room handover.
• Developmental delay or intellectual disability: assess cooperation, behavioral needs, seizure history and usual medications. Premedication and parental presence should be individualized.
• Consider aspiration risk if there is poor coordination, neuromuscular dysfunction, or feeding difficulty.

4. Hematologic, hepatic, endocrine, and infectious considerations

• Severe neonatal CRS can include thrombocytopenia, hepatosplenomegaly, hepatitis, and “blueberry muffin” lesions. In an older child, obtain targeted testing only if there is ongoing disease history or clinical evidence of bleeding/liver dysfunction.
• Review renal function, liver function, CBC/platelets, nutrition, and growth in children with significant multisystem disease.
• CRS virus shedding is principally an issue in infants, not generally a special isolation issue for a 10-year-old with established CRS. Follow institutional infection-control advice if active infection is suspected.

Important patient-specific point

• chronic cardiac failure/pulmonary overcirculation or pulmonary hypertension from PDA
• inadequate caloric intake, malabsorption, chronic illness, or syndromic developmental disability
• reduced respiratory reserve
• drug dosing based on actual weight, with attention to maximum doses and temperature/glucose management.

Why his bronchospasm matters

1. Timing: induction/intubation, after antibiotics, contrast administration, device deployment, emergence?
2. Ventilatory pattern: rising peak pressure, reduced tidal volume, capnogram “shark-fin”?
3. Associated features: hypotension, tachycardia, desaturation, rash/urticaria, facial edema.
4. Response: bronchodilator, deepening anesthesia, epinephrine, suctioning, tube repositioning.
5. Alternative diagnosis excluded: ETT obstruction/kink, endobronchial migration, aspiration, pulmonary edema from increased pulmonary flow, anaphylaxis, and pneumothorax.

• Bronchospasm immediately after intubation, without hypotension or rash, favors airway hyperreactivity or inadequate depth.
• Bronchospasm with hypotension, rash, or occurring shortly after an antibiotic, neuromuscular blocker, latex exposure, or contrast should be considered possible perioperative anaphylaxis until evaluated.
• Bronchospasm with pulmonary edema or worsening oxygenation in a child with a large PDA should raise concern for significant pulmonary overcirculation or cardiac dysfunction.

Practical plan for a future anesthetic

• Obtain the prior anesthesia chart and characterize the bronchospasm episode.
• Review recent echo for shunt direction, pulmonary pressures, ventricular function, and branch PA stenosis.
• Check for active respiratory symptoms; defer an elective procedure if active lower respiratory infection or wheeze is present.
• Optimize bronchodilator treatment if there is recurrent wheeze or a reactive-airway history. Morgan and Mikhail’s Clinical Anesthesiology, p. 991.
• Use a controlled, gentle airway plan with adequate anesthetic depth before instrumentation; have bronchodilator and anaphylaxis management immediately available.
• Maintain normoxia, normocapnia, normothermia, and avoid acidosis, especially if pulmonary hypertension is present.
• Plan post-procedure observation for recurrent bronchospasm, hypoxemia, pulmonary edema, and hemodynamic change after closure.

A 10-year-old, 13-kg child with congenital rubella syndrome and PDA has severe growth failure and a history of bronchospasm during transcatheter PDA closure. Future anesthetics require review of the prior event to distinguish airway hyperreactivity from mechanical airway obstruction, pulmonary edema, and perioperative hypersensitivity. Pre-anesthetic reassessment should focus on current respiratory status, pulmonary hypertension/shunt physiology, ventricular function, and nutrition.