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Paroxysmal tachycardia in infancy has a decreasing recurrence rate up to age 10, with a slight increase in adolescence, and does not appear to reduce long-term physical working capacity.
A follow-up study of 47 individuals with paroxysmal tachycardia in infancy is reported. The incidence of recurrence decreases from 55% during infancy to 17% up to 10 years of age; a slight increase to 23% is then observed in adolescence. There is a higher incidence of paroxysm in cases with preexcitation in the ECG. Physical overexertion may be a triggering factor in recurrences, but exemption from school physical education and sports should only be granted exceptionally. No signs of reduced physical working capacity were found in this group. The results of maintenance therapy do not appear to have improved in the past decade.
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Åke Lundberg (1973) studied this question.
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