Intermittent intra-atrial block: its diagnosis, incidence and implications.

@article{Legato1974IntermittentIB,
  title={Intermittent intra-atrial block: its diagnosis, incidence and implications.},
  author={M. Legato and M. I. Ferrer},
  journal={Chest},
  year={1974},
  volume={65 3},
  pages={
          243-51
        }
}
Fifty-six cases of intermittent intra-atrial block (IIAB), were found among 4,500 consecutive routine electrocardiograms (1.2 percent). Intermittently, abnormally wide P waves occurring either every other sinus beat or slightly more irregularly during sinus rhythm were ascribed to intermittent functional block in the anterior internodal tract. Other forms of intra-atrial block (IAB) are discussed. The course and possible prognostic significance of IIAB are presented. 
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