J Med Syst - Modeling and simulation of right ventricular volume measurement system during right heart catheterization.

Tópicos

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Resumo

Haemodynamic monitoring is necessary for the effective management of critically ill cardiac patients. Pulmonary artery catheterization has been used for monitoring the circulation, for measurement of intracardiac pressures and to estimate preload and afterload. However, pressures may not be accurate reflection of the circulation and simultaneous measurement of volumes would improve patient treatment. However, measurement of cardiac volumes especially of the right ventricle is difficult in everyday clinical practice In this work we propose the use of pulmonary artery catheter (PAC) with ultrasonic sensors built on it, to calculate the right ventricular end-diastolic (RVEDV) and end-systolic volume (RVESV). This is achieved by using the Ultrasonic (US) beam, to measure the distances between the transducers on the catheter and the RV walls. These distances, will be used as an input to a Volume calculating algorithm, which finally provides the RVEDV and RVESV, using a Neural Network (NN). For that reason, we have used cardiac Magnetic Resonance Imaging (MRI) and have modeled the catheter and the US transducers, to get as input the distances to the surface of the cavity. With these distances, and the known cardiac volumes (calculated using MR images) we trained and validated a NN for volume calculation. The results show that the algorithm accurately calculates the RVEDV. For the RVESV, greater deviations are observed between values calculated with our algorithm and cardiac MRI.

Resumo Limpo

haemodynam monitor necessari effect manag critic ill cardiac patient pulmonari arteri catheter use monitor circul measur intracardiac pressur estim preload afterload howev pressur may accur reflect circul simultan measur volum improv patient treatment howev measur cardiac volum especi right ventricl difficult everyday clinic practic work propos use pulmonari arteri cathet pac ultrason sensor built calcul right ventricular enddiastol rvedv endsystol volum rvesv achiev use ultrason us beam measur distanc transduc cathet rv wall distanc will use input volum calcul algorithm final provid rvedv rvesv use neural network nn reason use cardiac magnet reson imag mri model cathet us transduc get input distanc surfac caviti distanc known cardiac volum calcul use mr imag train valid nn volum calcul result show algorithm accur calcul rvedv rvesv greater deviat observ valu calcul algorithm cardiac mri

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