[Hypokalemia with pseudo-hyperaldosteronism: Is it Lidl® syndrome?]

Introduction: Intoxication induced by glycyrrhizin is a common cause of hypokalaemia by pseudo-hyperaldosteronism.

Observation: We hereby present the observation of a 68-year old patient hospitalised following a full hip-prosthesis operation after a deep hypokalaemia at 2.5mM was observed, with ECG signs (flat T waves and appearance of U waves). The kaliuresis was not adapted at 8,4mmol/mmol of creatininuria. We noted a history of axonal and demyelinising polyneuropathy, of psoriasis and chronic ethylism.The evolution after intravenous potassic supplementation and then per os was favourable leading to a normalisation of the blood and urinary potassic concentrations. The blood concentrations of renin and of aldosterone upon admission were lower than the detection threshold and the tests carried out 7 days later were normal with a plasmatic renin of 35.2 pg/mL and a plasmatic aldosterone of 74 pg/mL, therefore indicating a toxic cause. It is the interview of the patient that allowed for the diagnosis, identifying a daily, prolonged and important consumption (around 1L every 2-3 days for several years) of a pastis produced by supermarket brand Lidl®. The composition of the drink mentions 'liquorice infusion' without giving any more information as regards to the real concentration; it was later estimated at 170 mg/L by the distributor.

Discussion: The consumption of glycyrrhizin is a well-known aetiology for pseudo-hyperaldosteronism. It is commonly mentioned amongst excessive consumers of liquorice or of non-alcoholic anise drinks. Drinks that are derived from original pastis contain varying levels of glycyrrhizin, which is used as a flavour enhancer and can become toxic in cases of prolonged and important consumption.