Reference : Correction of Pressure Waveforms Recorded by Fluid-Filled Catheter Recording Systems: A ...
Scientific journals : Article
Human health sciences : General & internal medicine
Correction of Pressure Waveforms Recorded by Fluid-Filled Catheter Recording Systems: A New Method Using a Transfer Equation
Lambermont, Bernard mailto [Centre Hospitalier Universitaire de Liège - CHU > > Frais communs médecine >]
Gérard, Paul mailto [Université de Liège - ULg > Département de mathématique > Statistique (aspects expérimentaux) >]
Detry, Olivier mailto [Centre Hospitalier Universitaire de Liège - CHU > > Chirurgie abdominale- endocrinienne et de transplantation >]
Kolh, Philippe mailto [Université de Liège - ULg > Département des Sciences biomédicales et précliniques > Service de biochimie et de physiologie humaines, normale et pathologique > >]
Potty, P. [> > > >]
D'Orio, Vincenzo mailto [Université de Liège - ULg > Département des sciences cliniques > Médecine d'urgence - bioch. et phys. hum. normales et path.]
Marcelle, Roland [Université de Liège - ULg > > Relations académiques et scientifiques (Médecine) >]
Acta Anaesthesiologica Scandinavica
Yes (verified by ORBi)
[en] BACKGROUND: Pressure measuring systems using fluid-filled catheters can result in the recording of distorted pressure waveforms. It results in phase delay, overestimation of systolic and, to a lesser extent, of diastolic pressure. We designed and evaluated a method to correct this pressure waveform distortion using an appropriate transfer equation obtained from the dynamic response of the fluid-filled catheter. This transfer equation is based on the principle that a fluid-filled catheter recording system is considered as an underdamped dynamic system fully characterized by its natural frequency (omega n) and damping ratio (zeta). METHODS: Pressure waveforms, simultaneously recorded in vitro or in vivo by a fluid-filled catheter (Pc) and a micromanometer-tipped catheter (Pref), were used to validate the method. Dynamic response of the catheter used was obtained from a fastflush test. The corrected signal (Ppred) was obtained using omega n, zeta and the following transfer equation: d2Pc/dt2 + 2 omega n zeta dPc/dt + omega n 2Pc = C Ppred (t) After correction of Pc, Ppred was compared, using a linear regression, with Pref taken as reference. RESULTS: Our results showed that Ppred was fitted to Pref with excellent coefficient correlation (0.99). The mean error and the standard error of estimate were respectively -1.16 mmHg and 1.4 mmHg. CONCLUSION: This new method can convert the distorted pressure waveforms transmitted by any fluid-filled catheters into high-fidelity signals. It suppresses the phase delay and the over-estimation of systolic pressure induced by fluid-filled catheters.

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