To assess the cardiac functional changes in patients with dilated cardiomyopathy measured by a newly developed Doppler tissue imaging (DTI) and to compare the sensitivity and reliability of DTI with conventional function al indices.

• 探讨扩张型心肌病（DCM）的心功能变化，比较多普勒组织显像（DTI）与传统心功能指标的敏感性及可靠性。