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Renal Function Considerations for Stroke Prevention in Atrial Fibrillation.

John Fanikos1, Allison E Burnett2, Charles E Mahan3

  • 1Department of Pharmacy, Brigham and Women's Hospital, Boston, Mass.

The American Journal of Medicine
|May 16, 2017
PubMed
Summary

Direct oral anticoagulants (DOACs) offer a favorable risk-benefit profile for atrial fibrillation patients with mild to moderate renal impairment compared to warfarin. Careful monitoring is crucial due to varied renal elimination.

Keywords:
Atrial fibrillationDirect oral anticoagulants

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Area of Science:

  • Cardiology
  • Nephrology
  • Pharmacology

Background:

  • Renal impairment elevates risks of stroke, systemic embolism, and bleeding in atrial fibrillation (AF) patients.
  • Direct oral anticoagulants (DOACs) exhibit varying degrees of renal elimination, necessitating precise patient selection, dosing, and monitoring.
  • Warfarin has been the traditional anticoagulant, but its use requires frequent monitoring and dietary considerations.

Purpose of the Study:

  • To evaluate the efficacy and safety of DOACs compared to warfarin in nonvalvular atrial fibrillation (NVAF) patients with varying degrees of renal function.
  • To assess the risk-benefit profile of DOACs in NVAF patients experiencing declining renal function over time.
  • To highlight the importance of kidney function assessment in guiding anticoagulant therapy selection.

Main Methods:

  • Analysis of data from randomized controlled trials (RCTs) involving NVAF patients treated with DOACs versus warfarin.
  • Stratification of patients based on renal function (mild, moderate, severe impairment, and dialysis).
  • Comparison of key outcomes including stroke, systemic embolic events, and major bleeding between treatment groups.

Main Results:

  • DOACs demonstrated at least equivalent efficacy to warfarin in preventing stroke and systemic embolic events in NVAF patients.
  • DOACs were associated with significantly less bleeding compared to warfarin across all evaluated renal function categories.
  • DOACs showed a reduced risk of stroke, systemic embolic events, and major bleeding compared to warfarin in patients with mild or moderate renal impairment.

Conclusions:

  • DOACs represent a safer and effective alternative to warfarin for NVAF patients with mild to moderate renal impairment.
  • The risk-benefit profile of DOACs appears favorable in patients with decreasing renal function.
  • Further research is needed to establish the optimal use of DOACs in patients with severe renal impairment or on dialysis.