Pressure artifacts are a common phenomenon that must be addressed whenever using pulse contour methods (PCMs) to estimate CO. In fact, different catheter–transducer systems for arterial waveform transmission could give different results in terms of measured pressures.5 PRAM analyses the arterial signal using a sampling frequency of 1000 Hz. The high-frequency sampling permits a better precision, which is of primary importance for the calculation of the arterial impedance and the correct measurement of pressures. Indeed, in case of an eventual resonance effect of the catheter–transducer system, the device allows to adapt its setting to maximize the signal-to-noise ratio. A pressure waveform altered by under-damping might affect both the amplitude and morphology of the signal evaluated by PRAM. If resonance occurs, dP/dtmax provided by PRAM is abnormally high, reflecting the poor quality of the arterial trace. In this situation, PRAM could likely overestimate systolic arterial pressure and stroke volume. Conversely, there could be under-estimation in the case of over-damped signals.
Scolletta, S., Taccone, F.s., Romagnoli, S., Landoni, G., Giomarelli, P. (2011). Pressure recording analytical method to measure cardiac output after cardiac surgery: some practical considerations. BRITISH JOURNAL OF ANAESTHESIA, 107(5), 814-815 [10.1093/bja/aer319].
Pressure recording analytical method to measure cardiac output after cardiac surgery: some practical considerations
SCOLLETTA, SABINO;
2011-01-01
Abstract
Pressure artifacts are a common phenomenon that must be addressed whenever using pulse contour methods (PCMs) to estimate CO. In fact, different catheter–transducer systems for arterial waveform transmission could give different results in terms of measured pressures.5 PRAM analyses the arterial signal using a sampling frequency of 1000 Hz. The high-frequency sampling permits a better precision, which is of primary importance for the calculation of the arterial impedance and the correct measurement of pressures. Indeed, in case of an eventual resonance effect of the catheter–transducer system, the device allows to adapt its setting to maximize the signal-to-noise ratio. A pressure waveform altered by under-damping might affect both the amplitude and morphology of the signal evaluated by PRAM. If resonance occurs, dP/dtmax provided by PRAM is abnormally high, reflecting the poor quality of the arterial trace. In this situation, PRAM could likely overestimate systolic arterial pressure and stroke volume. Conversely, there could be under-estimation in the case of over-damped signals.File | Dimensione | Formato | |
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https://hdl.handle.net/11365/12100
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