Detection of body position changes using the surface electrocardiogram

Magnus Åström, J Garcia, P Laguna, Olle Pahlm, Leif Sörnmo

Research output: Contribution to journalArticlepeer-review

16 Citations (SciVal)


A method for detecting body position changes that uses the surface vectorcardiogram (VCG) is presented. Such changes are often manifested as sudden shifts in the electrical axis of the heart and can erroneously be interpreted as acute ischaemic events. Axis shifts were detected by analysing the rotation angles obtained from the alignment of successive VCG loops to a reference loop. Following the rejection of angles originating from noise events, the detection of body position changes was performed on the angle series using a Bayesian approach. On a database of ECG recordings from normal subjects performing a predefined sequence of body position changes, a detection rate of 92% and a false alarm rate of 7% was achieved.
Original languageEnglish
Pages (from-to)164-171
JournalMedical & Biological Engineering & Computing
Issue number2
Publication statusPublished - 2003

Subject classification (UKÄ)

  • Other Medical Engineering


  • rotation angles
  • VCG loops
  • loop alignment
  • body position
  • ischaemia monitoring


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