European Resuscitation Council (ERC) and American Heart Association (AHA) guidelines emphasize a rapid administration of calcium chloride (10 ml 10 % CaCl2) to protect the myocardium in the hyperkalaemia algorithm. However, calcium chloride preparations available in European markets vary from country to country. In our opinion, the drug dose recommended in the guidelines should not raise questions about the volume and amount of calcium in the intravenous supply and should be unambiguous to minimize the risk of error. Calcium dose should be given in terms of mmol/L or mEq or mg of calcium ions.
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