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A 33-year-old man attends the ED feeling unwell 24 hours after taking a novel psychoactive substance. He is diaphoretic and tachycardic but further examination is unremarkable. Investigations include: Na 130 mmol/L, K 7.5 mmol/L, HCO3 8 mmol/L, Ur 26 mmol/L, Cr 329 umol/L, arterial pH 7.27, base excess -6, lactate 3.5 mmol/L.
An ECG is an important early investigation. True or false?