MSFinals-0403

MSFinals-0403

A senior citizen is referred to the Emergency Department by his General Practitioner, feeling generally unwell and with reduced urine output. Bloods tests show: Na+ 128 mmol/l, K+ 7.2 mmol/l, urea 42.6 mmol/l, creatinine 828 μmol/l.
An electrocardiogram (ECG) shows widespread tenting of T-waves.
Which of the following treatments should be given first?