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High-Resolution Electrocardiography in Twins Affected by Situs Viscerum Specularis: Short Case Report

Published online by Cambridge University Press:  01 August 2014

S. Villatico Campbell ,
F. Di Maio ,
M.E. Silvotti ,
A. Sciacca ,
G. Brenci  and
L. Gedda
S. Villatico Campbell*
Affiliation:
Fourth Medical Clinic, University of Rome “La Sapienza”, Rome, Italy
F. Di Maio
Affiliation:
Fourth Medical Clinic, University of Rome “La Sapienza”, Rome, Italy
M.E. Silvotti
Affiliation:
Fourth Medical Clinic, University of Rome “La Sapienza”, Rome, Italy
A. Sciacca
Affiliation:
Fourth Medical Clinic, University of Rome “La Sapienza”, Rome, Italy
G. Brenci
Affiliation:
The Mendel Institute, Rome, Italy
L. Gedda
Affiliation:
The Mendel Institute, Rome, Italy
*
Via Stefano Iacini 16, 00191 Roma, Italy

Extract

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We previously studied a pair of MZ twins with situs viscerum inversus of the heart, liver and stomach, concordant with regard to all other factors normally utilized to diagnose zygosity [3]. We have now reexamined them after three years to evaluate the development of their cardiovascular system.

Our male MZ twins, now 17 years old, have been examined with high-resolution electrocardiography (HRE), treadmill stress test with Bruce protocol, tests stressing the cardiovascular system (cold pressure test, handgript test, arithmetic mental test), and single and two-dimensional dynamic echocardiography after holter monitoring.

Atriogram analysis is made possible by HRE, that shows individual morphological reproducibility. Such reproducibility is present in both twins. In the dextrocardiac twin it is also present with the electrode position inverted. The similarity of morphology in the cotwins is further confirmed, even if such similarity is only apparent, in view of the fact that the vectors are spatially of opposite orientation, thereby causing an inversion of the electrical field [1-4]. The H-V interval is normal, although in the dextrocardiac twin it is longer (30 ms) than in his cotwin (25 ms). As regards the echocardiographic and dynamic ECG examination, normal data were obtained for both twins which were pratically superposable to those obtained three years before.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 36 , Issue 4 , October 1987 , pp. 563 - 564
Copyright
Copyright © The International Society for Twin Studies 1987

References

REFERENCES

1. Bharati, S, Lev, M (1978): The course of the conduction system in dextrocardia. Circulation 57:1.CrossRefGoogle ScholarPubMed
2. Dickinson, DF, et al (1979): The cardiac conduction system in situs ambiguus. Circulation 59:5.CrossRefGoogle ScholarPubMed
3. Gedda, L, Sciacca, A, Brenci, G, Villatico Campbell, S, Bonanni, G, Gueli, N, Talone, C (1984): Situs viscerum specularis in monozysotic twins. Acta Genet Med Gemellol 33:81–85.Google ScholarPubMed
4. Perez, GL, Keith, L (1978): Electrocardiograms of twins. In Nance, WE (ed): Twin Research. Part C: Clinical Studies. New York: AR Liss, pp 33–47.Google Scholar