Application of an accelerometer in adjusting parameters and detecting characteristics in the pacemaker rate response.

To study the application of an accelerometer in adjusting the parameters, setting the sensor indicated rate (SIR) and detecting characteristics in the pacemaker (PM) rate response.Three-axis (GT9X Link-type) accelerometers were positioned on the waist and chest in 33 participants implanted with rate responsive PMs while wearing an ambulatory ECG recorder (Holter). During the walking test, by collecting vertical axis (Axis-1) activity intensity counts, Axis-1' metabolic equivalent of energy (MET) and its expected heart rate (HR) were calculated by the relevant equations, and on the basis of the HRas the target heart rate, the SIR was set by programming the rate response slope parameter.