Med Biol Eng Comput - Evaluation of a morphological filter in mean cardiac output determination: application to left ventricular assist devices.

Tópicos

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Resumo

A morphological filter (MF) is presented for the determination of beat-to-beat mean rotary left ventricular assist device (LVAD) flow rate, measured using an implanted flow probe. The performance of this non-linear filter was assessed using LVAD flow rate (QLVAD) data sets obtained from in silico and in vivo sources. The MF was compared with a third-order Butterworth filter (BWF) and a 10-s moving average filter (MAF). Performance was assessed by calculating the response time and steady state error across a range of heart rates and levels of noise. The response time of the MF was 3.5 times faster than the MAF, 0.5?s slower than the BWF, and had a steady state error of 2.61?%. It completely removed pulsatile signal components caused by residual ventricular function, and tracked sharp transient changes in QLVAD better than the BWF. The use of a two-stage MF improved the noise immunity compared to the single-stage MF. This study showed that the good performance characteristics of the non-linear MF make it a more suitable candidate for embedded real-time processing of QLVAD than linear filters.

Resumo Limpo

morpholog filter mf present determin beattobeat mean rotari left ventricular assist devic lvad flow rate measur use implant flow probe perform nonlinear filter assess use lvad flow rate qlvad data set obtain silico vivo sourc mf compar thirdord butterworth filter bwf s move averag filter maf perform assess calcul respons time steadi state error across rang heart rate level nois respons time mf time faster maf s slower bwf steadi state error complet remov pulsatil signal compon caus residu ventricular function track sharp transient chang qlvad better bwf use twostag mf improv nois immun compar singlestag mf studi show good perform characterist nonlinear mf make suitabl candid embed realtim process qlvad linear filter

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