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01.12.2014 | Research article | Ausgabe 1/2014 Open Access

BMC Anesthesiology 1/2014

Pulmonary vascular permeability index and global end-diastolic volume: are the data consistent in patients with femoral venous access for transpulmonary thermodilution: a prospective observational study

Zeitschrift:
BMC Anesthesiology > Ausgabe 1/2014
Autoren:
Helena Berbara, Sebastian Mair, Analena Beitz, Benedikt Henschel, Roland M Schmid, Wolfgang Huber
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1471-2253-14-81) contains supplementary material, which is available to authorized users.

Competing interests

Wolfgang Huber collaborates with Pulsion Medical Systems Feldkirchen, Germany as member of the Medical Advisory Board. The other authors declare that they have no competing interest.

Authors’ contributions

HB performed the majority of measurements, participated in analysis of the data and in drafting the manuscript and finally approved the manuscript. SM performed parts of the measurement, participated in analysis of the data and in drafting the manuscript and finally approved the manuscript. AB performed parts of the measurement, participated in analysis of the data and in drafting the manuscript and finally approved the manuscript. BH performed parts of the measurement, participated in analysis of the data and in drafting the manuscript and finally approved the manuscript. RS substantially contributed to conception and design of the study, participated in the analysis of the data, participated in drafting the manuscript and finally approved the manuscript. WH performed conception and design of the study, analyzed the data, drafted the manuscript and finally approved the manuscript.

Abstract

Background

Transpulmonary thermodilution (TPTD) derived parameters are used to direct fluid management in ICU-patients. Extravascular lung water EVLW and its ratio to pulmonary blood volume (pulmonary vascular permeability index PVPI) have been associated with mortality. In single indicator TPTD pulmonary blood volume (PBV) is estimated to be 25% of global end-diastolic volume (GEDV). A recent study demonstrated marked overestimation of GEDV indexed to body-surface area (BSA; GEDVI) when using a femoral central venous catheter (CVC) for indicator injection due to the additional volume measured in the vena cava inferior. Therefore, a correction formula derived from femoral TPTD and biometric data has been suggested. Consequence, one of the commercially available TPTD-devices (PiCCO; Pulsion Medical Systems, Germany) requires information about CVC site. Correction of GEDVI for femoral CVC can be assumed. However, there is no data if correction also pertains to unindexed GEDV, which is used for calculation of PBV and PVPI. Therefore, we investigated, if also GEDV, PBV and PVPI are corrected by the new PiCCO-algorithm.

Methods

In this prospective study 110 triplicate TPTDs were performed within 30 hours in 11 adult ICU-patients with PiCCO-monitoring and femoral CVC. We analyzed if the femoral TPTD correction formula for GEDVI was also applied to correct GEDV. Furthermore, we compared PVPIdisplayed to PVPIcalculated which was calculated as EVLWdisplayed/(0.25*GEDVdisplayed).

Results

Multiplication of GEDVIdisplayed by BSA resulted in GEDVcalculated which was not significantly different to GEDVdisplayed (1459 ± 365 mL vs. 1459 ± 366 mL) suggesting that correction for femoral indicator injection also pertains to GEDVdisplayed. However, PVPIdisplayed was significantly lower than PVPIcalculated (1.64 ± 0.57 vs. 2.27 ± 0.72; p < 0.001). In addition to a bias of -0.64 ± 0.22 there was a percentage error of 22%. Application of the correction formula suggested for GEDVI to PVPIdisplayed reduced the bias of PVPIdisplayed compared to EVLW/PBV from -0.64 ± 0.22 to -0.10 ± 0.05 and the percentage error from 22% to 4%.

Conclusions

Correction for femoral CVC in the PiCCO-device pertains to both GEDVIdisplayed and GEDVdisplayed, but not to PVPIdisplayed. To provide consistent information, PVPI should be calculated based on GEDVcorrected in case of femoral CVC.
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