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Fallot's tetralogy - balanced shunt syndrome

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A variant of Fallot's tetralogy characterised by spells of intermittent cyanosis, hyperpnoea and syncope. Physical development normal. Pulmonic murmur longer and louder, frequently with thrill. Soft pulmonic component of second sound. Both sexes affected; detected weeks or months after birth. It is less frequent than the classic form.


  • J. K. Perloss:
    The Clinical recognition of Congenital Heart Disease.
    2nd edition, page 485; Philadelphia, W. B. Saunders, 1978.
  • J. W. Hurst:
    The Heart. 6th edition, pp 662-667. New York, McGraw-Hill, 1886.

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