Pulsion Medical Systems Ag

Pulsion Medical Systems Se

Stephan Joeken

Oliver Goedje

Ulrich J Pfeiffer

Matthias Bohn

Marcus Veeck

Joerg Scheier

Matthias Fahle

Matthias F&auml;hle

Manu Malbrain

Jörg Scheier

The apparatus comprises a pressure sensor providing readings of a blood pressure of the patient and storage means for storing the readings as a pressure curve over time. Blood pressure is measured. The frequency difference between heart rate and breathing rate is used to separate the respiratory effect from the heart activity. In particular, the Fourier transform of the blood pressure and the spectral density are used to determine the contribution of each frequency. The respiratory and cardiac power spectra are determined. The ratio between both powers is calculated as the quotient of the integrals over the cardiac power spectrum and the respiratory power spectrum. A parameter usable to characterize volume responsiveness is determined using above ratio and a correction factor.

Apparatus and method for determining a physiologic parameter of a patient applying fourier transformation

The central venous sensor assembly comprises a catheter body with several proximal ports. The catheter portion placed in the vena cava superior is equipped with a proximal flux measurement unit, and the catheter portion placed in the vena cava inferior is equipped with a distal flux measurement unit. A first input channel supplies a measurement signal indicative of a flux vp to the evaluation unit from which the latter calculates a blood flow in the vena cava superior. Likewise, a second input channel supplies a measurement signal indicative of a flux vd to the evaluation unit from which the latter calculates a blood flow rate in the vena cava inferior. Due to continuity, the sum of the flow rates in the upper and lower central veins corresponds to the flow rate through the right heart and in the pulmonary artery and thus to cardiac output.

Central venous catheter assembly for measuring physiological data for cardiac output determination and method of determining cardiac output

From the global end-diastolic volume GEDV and the global ejection fraction GEF the patient monitor () determines a corrected global end-diastolic volume cGEDV according to/&#x192;()which is used as a novel parameter for volume responsiveness of the patient (). In the above formula, f(GEF) is a correction function depending on global ejection fraction GEF. Further, from the right ventricular end-diastolic volume RVEDV and the right ventricular ejection fraction RVEF the patient monitor () determines a corrected right ventricular end-diastolic volume cRVEDV according to()which is used as another novel parameter for volume responsiveness of the patient (). In the above formula, f(RVEF) is a correction function depending on right ventricular ejection fraction RVEF.

Patient monitoring apparatus and method for determining volume responsiveness of a monitored patient

Devices for in-vivo determination of the compliance function and the systemic blood flow of a living being

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Schopfheim, Germany

Stephan Joeken