ELECTION - The Electrode Configuration Cardiac Resynchronization Therapy (CRT) Study (ELECTION)

Inclusion Criteria: * Patients selected for a Guidant system, symptomatic heart failure, LV dysfunction, QRS width \> 120 ms, \> or = 18 yrs, able to understand the procedure, available for follow-up. Exclusion Criteria: * \< 18 years, life expectancy \< 6 months, expectation of heart transplantation during the study period, patients who have or are likely to receive a mechanical tricuspid valve, documented aortic stenosis, hypertrophic obstructive cardiomyopathy, inability or refusal to complete the follow-up at an approved centre, enrollment in another cardiovascular clinical investigation unless approved by the Manager of Clinical Studies, Guidant Canada, inability or refusal to sign consent.