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[Multifocal atrial tachycardia in infancy]
Insights
Multifocal atrial tachycardia (MAT) is a rare infant heart rhythm disorder. While often difficult to treat, it frequently resolves spontaneously within the first year of life.
Area of Science:
- Pediatric Cardiology
- Electrophysiology
- Neonatal Health
Context:
- Multifocal atrial tachycardia (MAT) is a rare supraventricular tachycardia in infants.
- Diagnosis relies on characteristic electrocardiogram (ECG) findings: ≥3 distinct P-waves, atrial rate >100 bpm, and variable intervals.
- MAT can occur in otherwise healthy infants or those with congenital heart defects like truncus arteriosus communis.
Purpose:
- To present a case series of four infants diagnosed with multifocal atrial tachycardia.
- To describe the clinical presentation, ECG characteristics, and treatment outcomes of these patients.
- To highlight the rarity and management challenges of MAT in infancy.
Summary:
- Four infants with MAT were analyzed, exhibiting typical ECG criteria.
- Onset varied from birth to 4 months; two infants were asymptomatic, while two showed cardiac enlargement and pulmonary congestion.
- Digoxin treatment was administered; two cases resolved, two persisted, indicating variable treatment response. MAT often resolves spontaneously within the first year.
Impact:
- This study underscores the diagnostic criteria and clinical spectrum of MAT in infants.
- It highlights the challenges in treating this rare arrhythmia and suggests a tendency for spontaneous resolution.
- Findings contribute to understanding the natural history and management of MAT in a pediatric population.
Abstract:
Four infants with multifocal atrial tachycardia are presented. They all displayed the typical ECG-findings of this particular form of supraventricular tachycardia: at least 3 different P-waves; varying atrial rate over 100 beats per minute; an isoelectric baseline between P-waves and a permanent variation of PP-, PR- and RR-intervals. One baby had a truncus arteriosus communis, the other 3 were healthy except for their rhythm disorder. In 2 of our patients, the multifocal atrial tachycardia was already present at birth, in the other 2 infants it became apparent at age 2 and 4 months respectively. Two children were asymptomatic, the other 2 had a slightly enlarged heart and some evidence of pulmonary venous congestion on chest roentgenogram. All 4 patients received digoxin. The tachycardia disappeared in 2 cases under but without definite causal relation to that treatment. In the 2 other cases the tachycardia persists in spite of treatment. Multifocal atrial tachycardia is a rare form of rhythm disturbance in infancy; it is difficult to treat but frequently resolves spontaneously within the first year of life.