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EasyGastroenterologyUpper gastrointestinal bleedingca-mccqe1ca-rcpsc-em

A 68-year-old woman presents with melaena and dizziness. She takes daily naproxen for osteoarthritis. Blood pressure is 95/60 mm Hg and heart rate 110 beats/min. Hb is 80 g/L. After stabilisation with fluids and transfusion as needed, which investigation should be performed urgently to identify the bleeding source?

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