@misc{indiciaecb6f219d06d8,
  title = {Electrocardiographic R-wave changes during cardiac surgery.},
  author = {J B Mark and G L Chien and R A Steinbrook and T Fenton},
  year = {1992},
  doi = {10.1213/00000539-199201000-00005},
  url = {https://pubmed.ncbi.nlm.nih.gov/1734793/},
  note = {Source identifier: 1734793}
}