Objective of this survey was to compare a new algorithm for pulse contour measurement, which additionally considers the individual compliance of the aorta for calculating the cardiac output (CO), with the previously used algorithm for the same pulsion continuous cardiac output (PiCCO) device (Medical Systems, Munich, Germany). Measurements were carried out on the surgical intensive care unit H3A of the Munich University Hospital Großhadern in 47 patients that had undergone cardiac surgery. Reference measurements of CO were obtained by standard thermodilution technique using the pulmonary artery catheter all patients had received for a different indication by their doctor in attendance, who was not involved in the study. After calibrating the PiCCO device, three successive single measurements were carried out every hour for six consecutive hours. Pulse waves were recorded and later transferred to another PiCCO device, which was equipped with the new algorithm. This procedure enabled us to simulate identical hemodynamic conditions on both devices. A total of 287 single measurements was acquired and analyzed. Statistical methodes: regression analysis and Bland Altmann Blot [Bland, 1986 #3] For PCCO old vs. COpa was R² = 0,634 (r=0,796), for PCCO new vs. COpa R² = 0,7681 (r=0,8764). Bland Altmann Blot: PCCO old vs. COpa Bias = 0,01 l/min, 2SD = 2,25l/min; PCCO new vs. COpa Bias = 0,25 l/min, 2SD = 1,3 l/min. We conclude that the new algorithm for PiCCO is superior to the previous one and it´s application can be recommended. Furthermore we were able to demonstrate that PiCCO is at least equivalent to standard thermodilution technique with regard to accuracy, with the advantage of being less invasive. We suggest further prospective studies in order to confirm these findings for various groups of patients, especially those with high fluctuations of CO, SVR and MAP.
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Objective of this survey was to compare a new algorithm for pulse contour measurement, which additionally considers the individual compliance of the aorta for calculating the cardiac output (CO), with the previously used algorithm for the same pulsion continuous cardiac output (PiCCO) device (Medical Systems, Munich, Germany). Measurements were carried out on the surgical intensive care unit H3A of the Munich University Hospital Großhadern in 47 patients that had undergone cardiac surgery. Refer...
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