What is the optimum strategy to manage potential hyperkalaemia associated with crush injury?
Date First Published:
July 17, 2026
Last Updated:
July 17, 2026
Report by:
Owen Williams, Emergency Medicine Trainee (Royal Centre for Defence Medicine, Academic Department of Military Emergency Medicine)
Search checked by:
Oliver Brown, Emergency Medicine Trainee
Three-Part Question:
In patients with crush injury what is the optimum management strategy for resulting hyperkalaemia?
Clinical Scenario:
A 23 year old farmer presents to the Emergency Department having trapped his legs by a piece of falling machinery. He is diagnosed with a crush injury of the lower limbs. Initial blood gas results show a potassium of 7mmol/L. You want to provide the optimum strategy for managing the hyperkalaemia.
Search Strategy:
For the complete search strategy please see:
http://tiny.cc/CrushBestBETsLitSearch
http://tiny.cc/CrushBestBETsLitSearch
Search Details:
A search was conducted on 2nd and 6th December 2022 and updated on 19th November 2024 to include and articles published in the intervening period. The databases searched:
Medline on EBSCO platform
CINAHL on EBSCO platform
EMBASE on Ovid platform
Medline on EBSCO platform
CINAHL on EBSCO platform
EMBASE on Ovid platform
Outcome:
40 articles identified for review
0 articles identified comparing treatments
Relevant findings summarised below
0 articles identified comparing treatments
Relevant findings summarised below
Author Commentary:
No papers were found which describe a treatment regime for the management of hyperkalaemia related to crush injury.
Although this literature search did not identify and treatment regimes for the management of hyperkalaemia secondary to crush injury, important information relating to hyperkalaemia in crush injury was found.
Multiple studies present the incidence of hyperkalaemia following crush injury. Despite heterogeneity in the definition of hyperkalaemia between studies, incidence is low nonetheless. In a study of 595 patients who presented with crush syndrome following the Maramara earthquake disaster in 1999, admission serum potassium was 5.3+/- 1.3 (range 2.4-13.3) mEq/L1. 176/595 were admitted with levels ≥6 mEq/L. Median serum potassium was higher in those requiring dialysis and in non-survivors, but no cut off point was identified to predict those who would require renal replacement therapy. A study of 9 patients presenting with crush syndrome following limb compression longer than 24 hours from the Sichuan earthquake of 2008 identified 5 patients with hyperkalaemia2. 3/9 patients underwent haemodialysis and alkalinisation. 2/9 patients had potassium levels >6 mEq/L Potassium levels were corrected to normal within days of ICU care. A retrospective study of 49 patients with crush injury found only one patient with a serum potassium of greater than 6mmol/L3. A further study of 135 patients with crush syndrome following the Bam earthquake in 2003 found a mean potassium concentration of 5.6 mEq/L +/- 1.3, with no patients having a potassium level greater than 6 mEq/L4.
It can be seen, therefore, that although a potential fatal complication of crush injury, hyperkalaemia is rare. Definitions of hyperkalaemia differ, but as the Resuscitation Council UK states, "hyperkalaemia is a continuum" and as the potassium concentration increases, so does the risk of adverse events and requirement for treatment5. The most common definition of hyperkalaemia amongst studies, including the Resuscitation Council’s guidelines, is of a serum potassium concentration greater than 5.5mmol/L. Given no study of hyperkalaemia in crush injury provides an evidence-based treatment regime, it would be prudent to follow the hyperkalaemia management guidance provided by the Resuscitation Council.
Although this literature search did not identify and treatment regimes for the management of hyperkalaemia secondary to crush injury, important information relating to hyperkalaemia in crush injury was found.
Multiple studies present the incidence of hyperkalaemia following crush injury. Despite heterogeneity in the definition of hyperkalaemia between studies, incidence is low nonetheless. In a study of 595 patients who presented with crush syndrome following the Maramara earthquake disaster in 1999, admission serum potassium was 5.3+/- 1.3 (range 2.4-13.3) mEq/L1. 176/595 were admitted with levels ≥6 mEq/L. Median serum potassium was higher in those requiring dialysis and in non-survivors, but no cut off point was identified to predict those who would require renal replacement therapy. A study of 9 patients presenting with crush syndrome following limb compression longer than 24 hours from the Sichuan earthquake of 2008 identified 5 patients with hyperkalaemia2. 3/9 patients underwent haemodialysis and alkalinisation. 2/9 patients had potassium levels >6 mEq/L Potassium levels were corrected to normal within days of ICU care. A retrospective study of 49 patients with crush injury found only one patient with a serum potassium of greater than 6mmol/L3. A further study of 135 patients with crush syndrome following the Bam earthquake in 2003 found a mean potassium concentration of 5.6 mEq/L +/- 1.3, with no patients having a potassium level greater than 6 mEq/L4.
It can be seen, therefore, that although a potential fatal complication of crush injury, hyperkalaemia is rare. Definitions of hyperkalaemia differ, but as the Resuscitation Council UK states, "hyperkalaemia is a continuum" and as the potassium concentration increases, so does the risk of adverse events and requirement for treatment5. The most common definition of hyperkalaemia amongst studies, including the Resuscitation Council’s guidelines, is of a serum potassium concentration greater than 5.5mmol/L. Given no study of hyperkalaemia in crush injury provides an evidence-based treatment regime, it would be prudent to follow the hyperkalaemia management guidance provided by the Resuscitation Council.
Bottom Line:
No specific strategy is required to manage the rare phenomenon of hyperkalaemia associated with crush injury. Local and national guidance for the management of hyperkalaemia should be followed.
Level of Evidence:
Level 3: Small numbers of small studies or great heterogeneity or very different population