The potassium value is important to prevent cardiac arrhythmias and sudden cardiac death. In patients with renal failure, the potassium value is not stable and tends to raise. Until now there are no data available if the potassium value has a circadian rhythm and if there are individual changes from day to day.
Potassium and cystatin c is measured every 2 hours during 24 hours, twice. There are two groups of patients: Patients with eGFR \< 60 ml/min and patients with eGFR \> 60 ml/min
Study Type
OBSERVATIONAL
Enrollment
30
blood withdrawal every 2 hours during 24 hours
Clinical Research Unit, Department of Nephrology and Hypertension, University of Erlangen-Nürnberg
Erlangen, Germany
Potassium rhythm
15 persons with normal renal function are hospitalized for 24 hours. Blood samples are taken every 2 hours in order to investigate the potassium value. It is repeated with 5 persons after 2 days, with 5 persons after 4 and with 5 persons after 6 days.
Time frame: twice in 24 hours
Potassium value in renal failure
15 persons with renal failure (GFR \< 60 ml/min) are hospitalized for 24 hours. Blood samples are taken every 2 hours in order to investigate the potassium value It is repeated with 5 persons after 2 days, with 5 persons after 4 and with 5 persons after 6 days.
Time frame: twice in 24 hours
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