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01.12.2018 | Letter | Ausgabe 1/2018 Open Access

Critical Care 1/2018

Adjuvant vitamin C in cardiac arrest patients undergoing renal replacement therapy: an appeal for a higher high-dose

Zeitschrift:
Critical Care > Ausgabe 1/2018
Autoren:
Patrick M. Honore, David De Bels, Thierry Preseau, Sebastien Redant, Rachid Attou, Herbert D. Spapen
Abbreviations
CRRT
Continuous renal replacement therapy
RRT
Renal replacement therapy
Vit C
Vitamin C
We read with interest the excellent review of Spoelstra-de Man et al. which focused on the potential benefit of adjuvant vitamin C (vit C) therapy in ischemia-reperfusion injury [ 1]. Following an exhaustive in-depth analysis of the impressive experimental, clinical, and safety record of vit C, the authors plead for a randomized controlled clinical trial assessing the effect of early, high-dose (i.e., at least 3 g/day), intravenous vit C administration in post-cardiac arrest patients.
About half of the patients may develop acute kidney injury stage ≥ 1 within 2 days after cardiac arrest and 20 to 60% will require renal replacement therapy (RRT) [ 2]. Vit C has a molecular weight of 176 Dalton and is thus exposed to significant clearance during RRT. Intermittent hemodialysis as well as continuous RRT (CRRT) are indeed associated with a 50% reduction of plasma ascorbate and vit C levels [ 35]. Diffusion and convection account for two-thirds and one-third, respectively, of the vit C loss [ 3]. A 3 g daily vit C dose, therefore, is by no means guaranteed to cover the acute need in post-cardiac arrest patients initiated on (C)RRT. Vasopressor-dependent subjects in particular may benefit from increased dosing because vit C has been shown to support endogenous vasoactive catecholamine synthesis. Awaiting solid pharmacological data, we propose to supplement post-cardiac arrest patients not treated with CRRT with 6 g vit C daily. If CRRT is running, the dose should be increased to 12 g. We fully agree with Spoelstra-de Man et al. to administer vit C as early as possible (i.e., before intensive care admission) and to continue treatment for a short period of time.

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The authors declare that they have no competing interests.

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