Comment on

• Cardiac resynchronization therapy in patients with a narrow QRS complex.

  Bleeker GB, Holman ER, Steendijk P, Boersma E, van der Wall EE, Schalij MJ, Bax JJ. Bleeker GB, et al. J Am Coll Cardiol. 2006 Dec 5;48(11):2243-50. doi: 10.1016/j.jacc.2006.07.067. Epub 2006 Nov 9. J Am Coll Cardiol. 2006. PMID: 17161254 Clinical Trial.
• Benefits of cardiac resynchronization therapy for heart failure patients with narrow QRS complexes and coexisting systolic asynchrony by echocardiography.

  Yu CM, Chan YS, Zhang Q, Yip GW, Chan CK, Kum LC, Wu L, Lee AP, Lam YY, Fung JW. Yu CM, et al. J Am Coll Cardiol. 2006 Dec 5;48(11):2251-7. doi: 10.1016/j.jacc.2006.07.054. J Am Coll Cardiol. 2006. PMID: 17161255