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The spectrum of pulmonary input impedance in children with complete transposition after the arterial switch operation

Published online by Cambridge University Press:  19 August 2008

Tomoaki Murakami*
Affiliation:
Departments of Pediatric Cardiology and Pediatric Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan
Toshio Nakanishi
Affiliation:
Departments of Pediatric Cardiology and Pediatric Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan
Makoto Nakazawa
Affiliation:
Departments of Pediatric Cardiology and Pediatric Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan
Kazuo Momma
Affiliation:
Departments of Pediatric Cardiology and Pediatric Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan
Yasuharu Imai
Affiliation:
Departments of Pediatric Cardiology and Pediatric Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan
*
Tomoaki Murakami, M D. Department of Pediatrics, Hokkaido University, School of Medicine, N-15, W-7, Kita-ku, Sapporo 060, Japan Tel:81-11-716-1161 Fax.81-11-736-9267

Abstract

We evaluated the physical characteristics of the pulmonary trunk in 32 patients with complete transposition after the arterial switch operation, calculating the pulmonary input impedance. In 6 of the patients, the characteristic impedance was equal to, or less than, the value in patients with ventricular septal defect. In those patients with an intact ventricular septum, or those with a ventricular septal defect who had undergone the arterial switch operation or banding of the pulmonary trunk before 3 months age, the frequency of the first modulus minimum also agreed with the values obtained in patients with ventricular septal defect. The value was high, however, in patients with complete transposition with ventricular septal defect who had undergone an arterial switch operation or banding of the pulmonary trunk after 4 months of age. Our data suggest decreased distensibility of the proximal pulmonary trunk after the arterial switch operation, and mild changes in the pulmonary vasculature in patients with complete transposition with ventricular septal defect who had undergone either an arterial switch operation or banding of the pulmonary trunk after 4 months of age. Long-term follow-up is needed clarify whether or not these features affect right ventricular function by means of an increase in afterload.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1998

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