首页 | 本学科首页   官方微博 | 高级检索  
     


Maximal hemodynamic response after the Fontan procedure: Doppler evaluation during the treadmill test
Authors:R. G. S. Cortes  G. Satomi  M. Yoshigi  K. Momma
Affiliation:(1) Department of Pediatric Cardiology, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan;(2) Division of Cardiology, Nagano Children's Hospital, 3100 Toyoshina Toyoshina-machi, Minamiazumi-gun, 399-82 Nagano, Japan
Abstract:Summary After undergoing the Fontan procedure for congenital heart disease, 16 young patients performed a maximal treadmill test according to the Bruce protocol. The peak velocity of the blood flow in the ascending aorta, stroke index, and cardiac index were measured by continuous-wave Doppler echocardiography at rest and at each stage of the test. The results were compared with those from 18 normal children. The body surface area was similar in the two groups. The endurance time was 37% shorter in the Fontan group than in the control group. From the beginning of exercise until the sixth minute, the increase in stroke index was lower in the Fontan group (NS). After that point, the stroke index was maintained at a high level in the control group but decreased toward its original level in the Fontan group. The response of cardiac index to exercise in the two groups was comparable until the sixth minute, after which the Fontan group failed to maintain an ascending curve. All the hemodynamic values were significantly higher in the control group at maximal exercise; at this point the cardiac index had increased 79% in the Fontan group and 170% in the control group. The subnormal response of the stroke volume at submaximal exercise and the subsequent decrease at maximal exercise following the Fontan procedure are important hemodynamic findings.
Keywords:Cardiac index  Continuous-wave Doppler  Fontan procedure  Maximal exercise capacity  Stroke index  Treadmill exercise test
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号