Pediatric Cardiology

, Volume 4, Issue 2, pp 121–124 | Cite as

Q-T interval in congenital complete heart block

  • Eva Esscher
  • Magnus Michaëlsson


The rate-corrected Q-T interval (Q-Tc) was measured in 273 children with congenital complete heart block. Fifty-nine had prolonged Q-Tc and 50 of these had symptoms. All 10 with isolated complete heart block, prolonged Q-Tc and bundle branch block had symptoms. The ventricular rate (VR) was significantly lower in patients with prolonged Q-Tc than in their age-matched controls. The outcome is worse for children with low VR and long Q-Tc than for those with low VR and normal Q-Tc. In 11 children a prolonged Q-Tc preceded symptoms by more than 1 month. This suggests that prolonged Q-Tc in children with congenital complete heart block can be of prognostic significance.

Key words

Congenital complete heart block Q-T interval Bundle branch block 


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  1. 1.
    Abildskov JA (1976) Adrenergic effects on the QT interval of the electrocardiogram.Am Heart J 92:210–216PubMedGoogle Scholar
  2. 2.
    Bazett HC (1920) An analysis of the time-relations of electrocardiograms.Heart 7:353–370Google Scholar
  3. 3.
    Dessertenne F (1966) La tachycardie ventriculaire à deux foyers opposés variables.Arch Mal Coeur 59:263–272PubMedGoogle Scholar
  4. 4.
    Dupuis C, Bens J-L, Brevière G-M (1975) Les blocs auriculoventriculaires chez l'enfant.Praxis 64:787–795PubMedGoogle Scholar
  5. 5.
    Esscher E, Michaëlsson M: Bloqueo A-V completo congenito In Diagnostico y tratamiento de las arritmias cardiacas (Bayes A, Cosin J, eds). Barcelona, Doyma, 1978, p 618–624Google Scholar
  6. 6.
    Kissin M, Schwarzschild MM, Bakst H (1948) Nomogram for rate correction of QT interval in electrocardiogram.Am Heart J 35:990–992Google Scholar
  7. 7.
    Landtman B, Linder E, Hjelt L, Tuuteri L (1964) Congenital complete heart block I. A clinical study of 27 cases.Ann Paediatr Fenn 10:99–104PubMedGoogle Scholar
  8. 8.
    Lepeschkin E: Physiologic basis of the U wave. InAdvances in Electrocardiography (Schlant RC, Hurst JW, eds). New York, London: Grune & Stratton, 1972, p 437Google Scholar
  9. 9.
    Michaëlsson M, Engle MA (1972) Congenital complete heart block. An international study of the natural history.Cardiovasc Clin 4:86–101Google Scholar
  10. 10.
    Michaëlsson M, Swiderski J (1967) High degree atrioventricular block in children.Proc Ass Europ Paediatr Cardiol III:44–49Google Scholar
  11. 11.
    New York Heart Association: Nomenclature and criteria for diagnosis of disease of the heart and great vessels/the criteria committee of the New York Heart Association. Boston, Little Brown, 1973, p 232Google Scholar
  12. 12.
    Schwartz PJ, Wolf S (1978) QT interval prolongation as predictor of sudden death in patients with myocardial infarction.Circulation 57:1074–1077PubMedGoogle Scholar
  13. 13.
    Schwartz PJ, Periti M, Malliani A (1975) The long QT syndrome.Am Heart J 89:378–390PubMedGoogle Scholar
  14. 14.
    Susmano A, Graettinger JS, Carleton RA (1969) The relationship between QT interval and heart rate.J Electrocardiol 2 (3):269–274PubMedGoogle Scholar
  15. 15.
    Taussig HB: Congenital malformations of the heart. Vol II Specific malformations. Cambridge, Mass, Harvard University Press, 1960, p 1002Google Scholar
  16. 16.
    White PD, Mudd SG (1929) Observations on the effect of various factors on the duration of the electrical systole of the heart as indicated by the length of the QT interval of the electrocardiogram.J Clin Invest 7:387–435Google Scholar
  17. 17.
    Yater WM, Lyon JA, McNabb PE (1933) Congenital heart block.JAMA 100:1831–1837A0946014 00007 CS-SPJRNPDF [HEADSUP]Google Scholar

Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Eva Esscher
    • 1
  • Magnus Michaëlsson
    • 1
  1. 1.Department of PaediatricsUniversity HospitalUppsalaSweden

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