A 60-year-old man presents with new-onset fatigue and dyspnoea on exertion. Hb is 110 g/L, MCV 88 fL, creatinine 180 µmol/L (baseline 90), and urea 18 mmol/L. He started an NSAID for back pain 2 weeks ago. Blood pressure is 95/60 mm Hg, and jugular venous pressure is low. According to AKI principles, what is the most likely type of acute kidney injury?