When to stop septic shock resuscitation: clues from a dynamic perfusion monitoring

Glenn Hernandez, Cecilia Luengo, Alejandro Bruhn, Eduardo Kattan, Gilberto Friedman, Gustavo A Ospina-Tascon, Andrea Fuentealba, Ricardo Castro, Tomas Regueira, Carlos Romero, Can Ince, Jan Bakker, Glenn Hernandez, Cecilia Luengo, Alejandro Bruhn, Eduardo Kattan, Gilberto Friedman, Gustavo A Ospina-Tascon, Andrea Fuentealba, Ricardo Castro, Tomas Regueira, Carlos Romero, Can Ince, Jan Bakker

Abstract

Background: The decision of when to stop septic shock resuscitation is a critical but yet a relatively unexplored aspect of care. This is especially relevant since the risks of over-resuscitation with fluid overload or inotropes have been highlighted in recent years. A recent guideline has proposed normalization of central venous oxygen saturation and/or lactate as therapeutic end-points, assuming that these variables are equivalent or interchangeable. However, since the physiological determinants of both are totally different, it is legitimate to challenge the rationale of this proposal. We designed this study to gain more insights into the most appropriate resuscitation goal from a dynamic point of view. Our objective was to compare the normalization rates of these and other potential perfusion-related targets in a cohort of septic shock survivors.

Methods: We designed a prospective, observational clinical study. One hundred and four septic shock patients with hyperlactatemia were included and followed until hospital discharge. The 84 hospital-survivors were kept for final analysis. A multimodal perfusion assessment was performed at baseline, 2, 6, and 24 h of ICU treatment.

Results: Some variables such as central venous oxygen saturation, central venous-arterial pCO2 gradient, and capillary refill time were already normal in more than 70% of survivors at 6 h. Lactate presented a much slower normalization rate decreasing significantly at 6 h compared to that of baseline (4.0 [3.0 to 4.9] vs. 2.7 [2.2 to 3.9] mmol/L; p < 0.01) but with only 52% of patients achieving normality at 24 h. Sublingual microcirculatory variables exhibited the slowest recovery rate with persistent derangements still present in almost 80% of patients at 24 h.

Conclusions: Perfusion-related variables exhibit very different normalization rates in septic shock survivors, most of them exhibiting a biphasic response with an initial rapid improvement, followed by a much slower trend thereafter. This fact should be taken into account to determine the most appropriate criteria to stop resuscitation opportunely and avoid the risk of over-resuscitation.

Keywords: Lactate; Microcirculation; Perfusion; Resuscitation; Septic shock.

Figures

Figure 1
Figure 1
Time-trend changes for selected perfusion parameters after normalization showing a biphasic recovery trend (see statistical analysis): A,lactate;B,capillary refill time (CRT);C,central venous-arterial pCO2gradient (P(cv-a)CO2).
Figure 2
Figure 2
Percentage of abnormal values for several perfusion and microcirculatory parameters in septic shock survivors. The evolution of these parameters at different time-points during the first 24 h of intensive care unit-based resuscitation is presented. PVD, perfused vessel density; PPV, proportion of perfused vessels; MFI, microvascular flow index; P(cv-a)CO2, central venous-arterial pCO2 gradient; CRT, capillary refill time.

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Source: PubMed

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