In re Littmann et al. (2007)…
For background regarding EKG double counting and Littmann’s sign of hyperkalemia, see March, 2012.
The following was recorded from an 82 year-old female with lethargy and malaise; electrolyte status is unknown, as is any further clinical data.
This is a 10 second strip with 9 QRS complexes; the true heart rate is thus 54bpm. The GE-Marquette 12SL interpretation algorithm has counted 163bpm, (3 x 54 = 162). Assuming that this is a result of systematic error and not coincidence, both the mechanism and significance of triple counting remain unclear.