Benzodiazepines and Hepatic Encephalopathy: Claims Cohort Findings Need Causal Caution

A large Medicare cohort associated benzodiazepine exposure with incident hepatic encephalopathy and related hospitalization in people with cirrhosis.

What the study estimated

Among 166,192 enrollees with cirrhosis, benzodiazepines were associated with incident encephalopathy after adjustment, with a hazard ratio of 1.24. The paper also reported an association with encephalopathy hospitalization. Several other medication classes and measures of liver disease severity were associated with incident disease.

A relative association is not an individual diagnosis

Claims-based exposure and outcomes do not capture every clinical detail, ingestion, or reason for prescribing. Underlying disease and indications can leave residual confounding despite adjustment. The hazard ratio is not a 24-percentage-point increase in absolute risk and does not prove that a benzodiazepine caused a specific episode. For an individual patient, examine liver disease, precipitating illness, medication timing, mental status, and competing explanations. The study identifies a clinically relevant association while leaving causation unresolved.

Source paper

Original analysis of the supplied journal article, identified as PMC6824059.

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