PC.22 Outcome of narrow complex arrhythmias in infants: a six-year retrospective study

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Supraventricular tachycardia (SVT) is the most common arrhythmia in infants.


To study the clinical presentation and outcome of narrow complex cardiac arrhythmias in infants


All infants diagnosed with narrow complex arrhythmias in children less than 1 year of age between 2007 and 2013 at Addenbrooke’s hospital were included in the study.


35 infants diagnosed with narrow complex arrhythmias were identified. Nineteen (54%) infants presented within first 7 days after birth, 8 (23%) between 1–4 weeks and the remaining 8 (23%) presented after 4 weeks of age.


Only 3 infants had antenatal diagnoses of arrhythmia. SVT was diagnosed in 28 infants (80%). Other types of arrhythmias included atrial flutter (3), ectopic atrial tachycardia (3) and atrial tachycardia (1). Nine infants had underlying significant congenital heart disease.


Sixteen infants were excluded from study as 3 died of other serious underlying conditions, 5 tansferred to other hospitals and 8 did not require maintenance therapy.


Of the 19 infants diagnosed with SVT needing maintenance therapy, 6 (32%) are still on maintenance therapy while in 13 (68%) infants maintenance therapy was stopped. Ten had no recurrences after stopping maintenance while three had recurrences needing re-starting treatment.


The average duration of medical treatment was 8 months. Maintenance medications used included propranolol, flecainide and amiodarone. 63% cases had monotherapy while 37% needed multi-drug therapy.


Narrow complex tachycardia carries good prognosis in infants without any underlying morbidities. About two thirds infants are managed on single medication for an average duration of 8 months.

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