Unintentional chronic acetaminophen poisoning during pregnancy resulting in liver transplantation.

INTRODUCTION: Acetaminophen (APAP) is a widely used medication in pregnancy and is considered safe. Unfortunately, APAP is also among the most commonly reported agents implicated in overdoses during pregnancy. We present a unique case of a pregnant patient with fulminant hepatic failure resulting in a liver transplant from repeated supratherapeutic ingestions of APAP. CASE REPORT: A 22 year pregnant female presented with abdominal pain and hepatotoxicity after taking supratherapeutic amounts of APAP to treat dental pain. The patient denied intentional or acute ingestion of APAP but did admit to taking approximately 8-9 grams of APAP per day for 10-14 days for dental pain. Other cause of hepatotoxicity, including acute fatty liver of pregnancy, were evaluated for and ruled out. She developed fulminant hepatic failure and required liver transplantation which was successful. The pregnancy remained viable through the operation but intrauterine fetal demise occurred 2 weeks later. An MRI of the fetus showed extensive peri-cerebral and intraventricular hemorrhage with extensive periventricular leukomalacia. DISCUSSION: The degree of morbidity from repeated supratherapeutic ingestions of APAP seen in this case is rare and poorly described in a pregnant patient. There are no prior reports describing the need for liver transplant after repeated supratherapeutic ingestions of APAP during pregnancy. Along with the typical cause of hepatotoxicy several unique pregnancy-related causes also had to be evaluated for. This case highlights the significant morbidity that can occur with even unintentional APAP toxicity and the need to educate patients, especially pregnant patients, of the risk of excessive APAP use.