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Relation of the timelag between the calibrations and the difference of CIpc and CItd (r = ?.03; P = 0.13). Conclusion The PiCCO system allows a reliable continuous measurement of the cardiac index using the pulse contour analysis. In our study we could not find an increased difference of CIpc and CItd even with longer time periods between the calibrations using transpulmonary thermodilution. Becau