Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Kaplan-Meier curves of patients subdivided by baseline QRS duration and dyssynchrony by the Yu Index showing probability of freedom from death, transplant, or ventricular assist device after cardiac resynchronization therapy (CRT). Significant dyssynchrony by the Yu Index before CRT was associated with a more favorable long-term outcome in patients with both wider and narrower QRS duration.
