Initial atropine dose of 0.5 mg versus 1 mg in unstable bradycardia: A propensity score-matched retrospective cohort study
When managing unstable bradycardia, the data suggest that starting with 1.0 mg of atropine might offer a superior initial response compared to 0.5 mg, potentially sparing you from needing to escalate therapy quickly. However, remember this is observational data, so don't change your standard protocol based on this alone; keep an eye out for prospective studies confirming this dose difference.
This retrospective, propensity score-matched cohort study compared the initial dosing of atropine—specifically 0.5 mg versus 1.0 mg—in adults presenting with unstable bradycardia in the emergency department setting. The authors found that initiating therapy with the higher dose of 1.0 mg was associated with better outcomes, namely a higher rate of first-dose success and a reduced need for subsequent escalation of care compared to the lower 0.5 mg dose. While these findings are suggestive of a dose-dependent benefit, the authors rightly caution that the evidence is derived from a retrospective analysis, emphasizing the necessity of prospective, multicenter trials to solidify these conclusions.