Heart 1998;80:327-329 ( October )
Spring coil retraction in coil occlusion of persistent ductus arteriosus
a Department of Paediatrics, Juntendo
University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113, Japan, b Department of Thoracic Surgery, Juntendo
University School of Medicine
Correspondence to: Dr T Ino, Department of Paediatrics, Kameda Medical Centre, 929 Higashi-cho, Kamogawa, Chiba 296-8602, Japan.
Accepted for publication 5 June 1998
Aims
To present the short and intermediate term
results of coil occlusion of persistent ductus arteriosus and the
results of radiographic measurements of spring coils implanted to treat
patent ducts.
Patients22 children underwent coil occlusion.
Their ages ranged from 2 years 9 months to 12 years 10 months (mean
(SD) age, 6.5 (3.6) years). The duct diameter ranged from 1.0 to 3.5 mm
at the narrowest point (mean 2.6 (0.7) mm). In 11 of the children
regular coils were implanted using the non-attached system, while in
the other 11 the detachable coil embolisation system was used.
Results12 children (55%) had no
significant residual leaks immediately after procedures involving a
single coil delivery. The remaining 10 (45%) had residual leaks
immediately after the procedure, although no patient with a
large duct showed residual leakage 18 months after the procedure.
Radiographic measurement of the coils showed that all implanted coils
retracted to 65-85% of their original size immediately after
occlusion. This retraction was more evident in patients showing
spontaneous closure of the residual shunt or having a coil 8 mm in diameter.
ConclusionsCoil embolisation is an acceptable
method for occluding persistent ductus arteriosus. Retraction of
implanted coils is common in the follow up period. Such retraction may
be related to spontaneous closure of residual shunt after embolisation.
© 1998 by Heart
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