The ACCF/AHA/HRS has updated their 2008 guidelines on indications for device therapy of rhythm abnormalities. Cardiac resynchronization therapy (CRT) Class I indications now include those with a LBBB and QRS >150 ms, and has been expanded to those with NYHA Class II CHF symptoms. Class IIa indications include those with EF<35%, LBBB with QRS 120-149 (or non-LBBB with QRS>150) and Class II-IV symptoms. They recommend against CRT in those with Class I-II symptoms, non-LBBB with QRS<150, or those with expected survival < a year. The full guidelines can be found at (site)
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