BioMed Research International / 2014 / Article / Tab 1

Research Article

Removal of Cardiopulmonary Resuscitation Artifacts with an Enhanced Adaptive Filtering Method: An Experimental Trial

Table 1

Estimated signal-to-noise ratio (SNR) for pulseless electrical activity (PEA), ventricular fibrillation (VF), and asystole (ASY) before and after filtering.

UnfilteredAdaptive filterHigh-pass filter

Medians (dB) (25/75 percentiles)
 VF−9.3 (−14.9/−3.6)△△0.2 (−5.1/4.5)**0.1 (−4.2/0.9)**
 PEA−6.2 (−9.0/−1.12)△△0.1 (−3.6/3.4)**−2.0 (−7.4/−0.6)**
 ASY−21.2 (−24.2/−18.5)△△−12.7 (−15.0/−4.4)**−7.1 (−10.7/−6.3)**
Range (dB) (min./max.)
 VF−26.1/9.6−18.2/20.0−19.7/20.4
 PEA−16.0/9.9−7.6/19.9−14.0/14.7
 ASY−31.6/−10.0−20.6/2.4−18.4/1.7

Compared with unfiltered signal, ; comparison among rhythm types, .