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Among patients with liver cirrhosis prior to liver transplantation, CO production as measured by blood carboxyhemoglobin (COHb) levels were noted to be even higher in patients with Hepato-pulmonary syndrome (HPS) compared to those who has not. Among patients without HPS, the mean COHb levels prior to transplant was 2.5% which decreased to 1.95% (p=0.0003) after transplant with mean delta change of 0.55. After liver transplant, COHb levels significantly decreased in all patients but much more so in patients with HPS compared to without HPS as shown by the substantial difference in delta change. [Extracted from the article]