Comment on

• Sex-specific mortality risk by QRS morphology and duration in patients receiving CRT: results from the NCDR.

  Zusterzeel R, Curtis JP, Caños DA, Sanders WE, Selzman KA, Piña IL, Spatz ES, Bao H, Ponirakis A, Varosy PD, Masoudi FA, Strauss DG. Zusterzeel R, et al. J Am Coll Cardiol. 2014 Sep 2;64(9):887-94. doi: 10.1016/j.jacc.2014.06.1162. J Am Coll Cardiol. 2014. PMID: 25169173
• Some caveats about QRS duration in patients receiving cardiac resynchronization therapy.

  Madias JE. Madias JE. J Am Coll Cardiol. 2015 Feb 10;65(5):514-5. doi: 10.1016/j.jacc.2014.09.091. J Am Coll Cardiol. 2015. PMID: 25660933 No abstract available.