Polypharmacy and Clinical Outcomes in Hospitalized Patients With Acute Decompensated Heart Failure.
Neiko Ozasa, Takao Kato, Takeshi Morimoto and 12 others
PMID 35030108WHAT IT FOUND
Heart failure patients discharged on 12 or more medications had a 30% higher adjusted risk of death or readmission within one year compared to those on 5 or fewer.
This risk was not significant in patients aged 80 or older or those with anemia.
Key findings
01Patients in the highest medication quartile (12 or more drugs) had a significantly higher adjusted risk of the primary composite outcome (death or rehospitalization) compared to the lowest quartile (5 or fewer drugs).
02The association between high medication count and poor outcomes was not significant in patients aged 80 years or older, nor in those with anemia.
03Polypharmacy was highly prevalent, with 81.5% of the study population receiving prescriptions for more than 5 medications at discharge.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The study is observational, so residual confounding may influence the results; it cannot prove that the medications themselves caused the poor outcomes. Data on patient adherence to medications were not collected, so non-adherence could explain some outcomes. The study only counted oral medications at discharge and did not include injectables, eye drops, or over-the-counter medicines, potentially underestimating the true burden of polypharmacy. Doses and medication schedules were not analyzed, so the intensity of treatment was not accounted for. Detailed causes of readmission and death were not available, making it difficult to attribute outcomes specifically to medication-related adverse events.
Declared interests
The study was physician-initiated. Funding sources and specific conflicts of interest for the authors are not detailed in the provided text, though it notes support from non-U.S. government sources.
The easy way to misread this
Do not assume that reducing the number of medications will automatically lower risk. This is an observational study showing an association, not a causal link. Furthermore, the increased risk was not significant in patients aged 80 or older or those with anemia, so applying this finding uniformly to all elderly heart failure patients may be inappropriate.