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Hepatopulmonary syndrome screening, grading and follow-up algorithm for liver transplantation candidates. Adapted from Pastor et al[48]. SpO2: Hemoglobin oxygen saturation; HPS: Hepatopulmonary syndrome; PaO2: Partial pressure of oxygen; MELD: Model for end-stage liver disease; LT: Liver transplantation; 99mTc NAA: Technetium macroaggregated albumin.
