Intensive Care Medicine

, Volume 38, Issue 11, pp 1834–1842 | Cite as

Association between hyperkalemia at critical care initiation and mortality

  • Gearoid M. McMahon
  • Mallika L. Mendu
  • Fiona K. Gibbons
  • Kenneth B. Christopher
Original

Abstract

Purpose

To investigate the association between potassium concentration at the initiation of critical care and all-cause mortality.

Methods

We performed a retrospective observational study on 39,705 patients, age ≥18 years, who received critical care between 1997 and 2007 in two tertiary care hospitals in Boston, Massachusetts. The exposure of interest was the highest potassium concentration on the day of critical care initiation and categorized a priori as 4.0–4.5, 4.5–5.0, 5.0–5.5, 5.5–6.0, 6.0–6.5, or ≥6.5 mEq/l. Logistic regression examined death by days 30, 90, and 365 post-critical care initiation, and in-hospital mortality. Adjusted odds ratios were estimated by multivariable logistic regression models.

Results

The potassium concentration was a strong predictor of all-cause mortality 30 days following critical care initiation with a significant risk gradient across potassium groups following multivariable adjustment: K = 4.5–5.0 mEq/l OR 1.25 (95 % CI, 1.16–1.35; P < 0.0001); K = 5.0–5.5 mEq/l OR 1.42 (95 % CI, 1.29–1.56; P < 0.0001); K = 5.5–6.0 mEq/l OR 1.67 (95 % CI, 1.47–1.89; P < 0.0001); K = 6.0–6.5 mEq/l OR 1.63 (95 % CI, 1.36–1.95; P < 0.0001); K > 6.5 mEq/l OR 1.72 (95 % CI, 1.49–1.99; P < 0.0001); all relative to patients with K = 4.0–4.5 mEq/l. Similar significant associations post multivariable adjustments are seen with in-hospital mortality and death by days 90 and 365 post-critical care initiation. In patients whose hyperkalemia decreases ≥1 mEq/l in 48 h post-critical care initiation, the association between high potassium levels and mortality is no longer significant.

Conclusions

Our study demonstrates that a patient's potassium level at critical care initiation is robustly associated with the risk of death even at moderate increases above normal.

Keywords

Potassium Intensive care Mortality 

Supplementary material

134_2012_2636_MOESM1_ESM.docx (171 kb)
Supplementary material 1 (DOCX 171 kb)

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Copyright information

© Copyright jointly held by Springer and ESICM 2012

Authors and Affiliations

  • Gearoid M. McMahon
    • 1
  • Mallika L. Mendu
    • 2
  • Fiona K. Gibbons
    • 3
  • Kenneth B. Christopher
    • 4
  1. 1.Renal DivisionBrigham and Women’s HospitalBostonUSA
  2. 2.Department of Internal MedicineBrigham and Women’s HospitalBostonUSA
  3. 3.Pulmonary DivisionMassachusetts General HospitalBostonUSA
  4. 4.The Nathan E. Hellman Memorial Laboratory, Renal DivisionBrigham and Women’s HospitalBostonUSA

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