23rd June 2023

An 80-year-old man has bloods sent by his GP due to nausea and lethargy

An 80-year-old man has bloods sent by his GP due to nausea and lethargy, the results are below:

Result	Normal reference range
Urea 25mmol/L	2.5-7.0mmol/L
Creatinine 465μmol/L (baseline 110μmol/L)	60-100μmol/L
Potassium 5.8mmol/L	3.5-5.0mmol/l

He is referred to hospital, and clinical assessment shows normal observations, euvolaemia, and lower abdominal fullness. A bedside bladder scan shows a residual volume of 900ml, and a formal ultrasound shows bilateral hydronephrosis.

Which of the interventions below is the first step in management of this patient?

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