Scandinavian journal of trauma, resuscitation and emergency medicine · 2025
The association between arrival potassium and 30-day survival following resuscitation from out-of-hospital cardiac arrest: a retrospective cohort study.
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Byrne Christina, Krogager Maria Lukacs, Kragholm Kristian, Pareek Manan, Mohr Grimur Høgnason, Ringgren Kristian Bundgaard, Wissenberg Mads, Riddersholm Signe, Wolder Martin, Folke Fredrik, Gislason Gunnar, Køber Lars, Hassager Christian, Kjærgaard Jesper, Fordyce Christopher B, Torp-Pedersen Christian, Lip Gregory Y H, Barcella Carlo A
Аннотация
BACKGROUND: It is unknown whether there is an association between initial serum potassium level and short-term survival in out-of-hospital cardiac arrest (OHCA) survivors. The aim of this study was to describe potential associations between first recorded potassium level and 30-day survival in patients surviving OHCA.
METHODS: We identified 4,894 patients who had return of spontaneous circulation (ROSC) at hospital arrival, and a registered post-OHCA serum-potassium value, using Danish nationwide registry data from 2001-2019. Potassium values were divided into seven predefined levels: < 2.5, 2.5-2.9, 3.0-3.4, 3.5-4.6, 4.7-5.5, 5.5-6.0, > 6.0 mmol/L. Thirty-day survival was estimated using a multivariable Cox regression (reference normokalemia 3.5-4.6 mmol/L). The multivariable model included age, sex, Charlson comorbidity index (including chronic kidney disease), witnessed status, performance of bystander cardiopulmonary resuscitation (CPR) and first registered heart rhythm.
RESULTS: Over the 30-day follow-up period, survival rates in the seven strata were as follows: 25 (51.0%), 119 (53.6%), 512 (65.4%), 1,631 (57.9%), 220 (32.7%), 34 (22.8%), and 46 (22.7%), respectively. Thirty-day survival was significantly lower for all groups with hyperkalemia compared with normokalemia: 4.7-5.5 mmol/L: (average risk ratio (RR): 0.72, 95% confidence interval (95% CI): 0.66-0.78); 5.5-6.0 mmol/L: (average RR: 0.60, 95% CI: 0.47-0.73); > 6.0 mmol/L: (average RR: 0.56, 95% CI: 0.46-0.66). Survival did not differ significantly in patients with hypokalemia compared with normokalemia.
CONCLUSIONS: In OHCA survivors, hyperkalemia was associated with reduced 30-day survival compared with normokalemia, independent of age, sex, comorbidity burden and pre-hospital OHCA-characteristics. Conversely, hypokalemia was not associated with reduced 30-day survival.
METHODS: We identified 4,894 patients who had return of spontaneous circulation (ROSC) at hospital arrival, and a registered post-OHCA serum-potassium value, using Danish nationwide registry data from 2001-2019. Potassium values were divided into seven predefined levels: < 2.5, 2.5-2.9, 3.0-3.4, 3.5-4.6, 4.7-5.5, 5.5-6.0, > 6.0 mmol/L. Thirty-day survival was estimated using a multivariable Cox regression (reference normokalemia 3.5-4.6 mmol/L). The multivariable model included age, sex, Charlson comorbidity index (including chronic kidney disease), witnessed status, performance of bystander cardiopulmonary resuscitation (CPR) and first registered heart rhythm.
RESULTS: Over the 30-day follow-up period, survival rates in the seven strata were as follows: 25 (51.0%), 119 (53.6%), 512 (65.4%), 1,631 (57.9%), 220 (32.7%), 34 (22.8%), and 46 (22.7%), respectively. Thirty-day survival was significantly lower for all groups with hyperkalemia compared with normokalemia: 4.7-5.5 mmol/L: (average risk ratio (RR): 0.72, 95% confidence interval (95% CI): 0.66-0.78); 5.5-6.0 mmol/L: (average RR: 0.60, 95% CI: 0.47-0.73); > 6.0 mmol/L: (average RR: 0.56, 95% CI: 0.46-0.66). Survival did not differ significantly in patients with hypokalemia compared with normokalemia.
CONCLUSIONS: In OHCA survivors, hyperkalemia was associated with reduced 30-day survival compared with normokalemia, independent of age, sex, comorbidity burden and pre-hospital OHCA-characteristics. Conversely, hypokalemia was not associated with reduced 30-day survival.