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A 42-year-old man is brought to hospital 45 minutes after taking an unknown number of amitriptyline tablets. He is drowsy, has a blood pressure of 78/46 mmHg and a broad-complex rhythm; the ECG shows a QRS duration of 150 ms (less than 100 ms). Which one of the following should be administered immediately?

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TricyclicsSodium BicarbonateOverdose

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