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A 66-year-old man has had ninety minutes of central chest pain with sweating. His electrocardiogram shows 3 mm ST elevation in leads II, III and aVF with ST depression in I and aVL, and 1.5 mm ST elevation in lead V4R. His blood pressure is 88/56 mmHg and his heart rate is 56/min. The jugular venous pressure is elevated to the angle of the jaw and the lungs are clear on auscultation. Aspirin 300 mg and ticagrelor 180 mg have been given and the catheter laboratory has been activated. Which one of the following should he be given while transfer is arranged?
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