Unexplained tachycardia in an elderly patient.

@article{Brennan1986UnexplainedTI,
  title={Unexplained tachycardia in an elderly patient.},
  author={Meagan Elizabeth Brennan and Hugh J. Morgan},
  journal={Journal of the Tennessee Medical Association},
  year={1986},
  volume={79 3},
  pages={158-9}
}