A 68-year-old man presents to the emergency department with large-volume haematemesis and melena. He is pale, diaphoretic and hypotensive at 85/50 mmHg with a pulse of 120 beats/min. What is the single most important initial management priority?AArrange urgent upper endoscopyBGive high-dose intravenous proton pump inhibitorCInsert a nasogastric tube for lavageDAggressive intravenous crystalloid resuscitation and blood product preparationEAdminister octreotide infusionCheck my answer