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Rate/rhythm control and stroke

In comparison with rate control therapy, the use of rhythm control therapy is associated with lower rates of stroke/transient ischaemic attack (TIA) among patients with atrial fibrillation (AF), in particular those with moderate and high risk of stroke, according to a study1 published recently in Circulation.

Researchers conducted a population-based observational study of Quebec patients ≥65 years with a diagnosis of AF during the period 1999 to 2007, with the use of linked administrative data from hospital discharge and prescription drug claims databases. They compared rates of stroke or TIA among patients using rhythm (class Ia, Ic, and III antiarrhythmics), versus rate control (β-blockers, calcium channel blockers, and digoxin) treatment strategies (either current or new users).

The cohort consisted of 16,325 patients who filled a prescription for rhythm control therapy (with or without rate control therapy) and 41,193 patients who filled a prescription for rate control therapy, with a mean follow-up of 2.8 years (maximum 8.2 years). A lower proportion of patients on rhythm control therapy than on rate control therapy had a CHADS2 (congestive heart failure, hypertension, age ≥75 years, diabetes mellitus, and previous stroke or TIA) score of ≥2 (58.1% versus 67.0%, p<0.001).

Treatment with any antithrombotic drug was comparable in the two groups (76.8% in rhythm control versus 77.8% in rate control group). Crude stroke/TIA incidence rate was lower in patients treated with rhythm control in comparison with rate control therapy (1.74 versus 2.49, per 100 person-years, p<0.001). This association was more marked in patients in the moderate- and high-risk groups for stroke according to the CHADS2 risk score.

In multivariable Cox regression analysis, rhythm control therapy was associated with a lower risk of stroke/TIA in comparison with rate control therapy (adjusted hazard ratio, 0.80; 95% confidence interval, 0.74, 0.87). The lower stroke/TIA rate was confirmed in a propensity score-matched cohort.

References

1. Tsadok MA, Jackevicius CA, Essebag V, et al. Rhythm versus rate control therapy and subsequent stroke or transient ischemic attack in patients with atrial fibrillation. Circulation 2012;126:2680–7. http://dx.doi.org/10.1161/​CIRCULATIONAHA.112.092494

Published on: December 20, 2012

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ENDORSED BY

  • ArrhythmiaAlliance
  • Stars
  • Anticoagulation Europe
  • Atrial Fibrillation Association
 

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