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Electrolyte shifts across the artificial lung in patients on extracorporeal membrane oxygenation: interdependence between partial pressure of carbon dioxide and strong ion difference.

Abstract：

PURPOSE:Partial pressure of carbon dioxide (PCO2), strong ion difference (SID), and total amount of weak acids independently regulate pH. When blood passes through an extracorporeal membrane lung, PCO2 decreases. Furthermore, changes in electrolytes, potentially affecting SID, were reported. We analyzed these phenomena according to Stewart's approach. METHODS:Couples of measurements of blood entering (venous) and leaving (arterial) the extracorporeal membrane lung were analyzed in 20 patients. Changes in SID, PCO2, and pH were computed and pH variations in the absence of measured SID variations calculated. RESULTS:Passing from venous to arterial blood, PCO2 was reduced (46.5 ± 7.7 vs 34.8 ± 7.4 mm Hg, P < .001), and hemoglobin saturation increased (78 ± 8 vs 100% ± 2%, P < .001). Chloride increased, and sodium decreased causing a reduction in SID (38.7 ± 5.0 vs 36.4 ± 5.1 mEq/L, P < .001). Analysis of quartiles of ∆PCO2 revealed progressive increases in chloride (P < .001), reductions in sodium (P < .001), and decreases in SID (P < .001), at constant hemoglobin saturation variation (P = .12). Actual pH variation was lower than pH variations in the absence of measured SID variations (0.09 ± 0.03 vs 0.12 ± 0.04, P < .001). CONCLUSIONS:When PCO2 is reduced and oxygen added, several changes in electrolytes occur. These changes cause a PCO2-dependent SID reduction that, by acidifying plasma, limits pH correction caused by carbon dioxide removal. In this particular setting, PCO2 and SID are interdependent.

journal_name

J Crit Care

journal_title

Journal of critical care

authors

Langer T,Scotti E,Carlesso E,Protti A,Zani L,Chierichetti M,Caironi P,Gattinoni L

doi

10.1016/j.jcrc.2014.09.013

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

2-6

issue

1

eissn

0883-9441

issn

1557-8615

pii

S0883-9441(14)00391-8

journal_volume

30

pub_type

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