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wabp attempts to locate arterial blood pressure (ABP) pulse waveforms in a continuous ABP signal in the specified record. The detector algorithm is based on analysis of the first derivative of the ABP waveform. The output of wabp is an annotation file (with annotator name wabp) in which all detected beats are labelled normal.
wabp can process records containing any number of signals, but it uses only one signal for ABP pulse detection (by default, the lowest-numbered ABP, ART, or BP signal; this can be changed using the -s option, see below). wabp is optimized for use with adult human ABPs. It has been designed and tested to work best on signals sampled at 125 Hz. For other ABPs, it may be necessary to experiment with the sampling frequency as recorded in the input record’s header file (see header(5) ).
wabp optionally uses the WFDB library’s setifreq function to resample the input signal at 125 Hz.
It may be necessary to set and export the shell variable WFDB (see setwfdb(1) ).
To mark ABP pulses in record slp60 of the slpdb
database, beginning 5 minutes from the start, ending 10 minutes and 35
seconds from the start, and using signal 1, use the command:
wabp -r slpdb/slp60 -f 5:0 -t 10:35 -s 1
The output annotations may be read using (for example):
rdann -r slpdb/slp60 -a wabp
Zong W, Heldt T, Moody GB, and Mark RG. An open-source algorithm to detect onset of arterial blood pressure pulses. Computers in Cardiology 30:259-262 (2003).
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Updated 28 May 2015