A 12-year old boy with unremarkable previous medical history regularly vaccinated, was hospitalised two days ago with flu-like symptoms, abdominal pain and vomiting. His condition was gradually worsening with changes in, mentation (GCS initialty was 15 now is 12), rapid and noisy breathing arterial hypotension (BP 95/50 MmHg), oliguria (after initial polyuria), hyperthermia, with 38.8°C despite the antiviral (Oseltamivir) and the symptomatic therapy that were started initially. You run a blood and urine analysis and receive the following results: arterial blood pH 7.0, PaCO2 20 mmHg. BE (-16), [HCO3-] 10 mmol/L, blood glucose 2 mmol/L, [K+] 3.4 mmol/l, [Na+] 132 mmol/L, [Cl-] 90 mmol/L, and serum creatinine 60 μmol/l, urea 3 μmol/l, 4(+) glucose and 3(+) ketones in urine
What are the first therapeutic intervention you would start with in this case?
Select one of the following: