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Modeling of Amiodarone Effect on Heart Rate Control in Critically Ill Patients with Atrial Tachyarrhythmias

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Abstract

Aims

Amiodarone is the gold-standard medication to control heart rate in critically ill patients with atrial tachyarrhythmias (ATs); however, effective doses and covariates influencing its efficacy remain unknown. We therefore performed pharmacodynamic modeling of heart rate reduction induced by amiodarone in these patients.

Methods and Results

This observational study included 80 consecutive severely ill patients receiving amiodarone to treat ATs. A total of 1348 time–heart rate observations with 361 amiodarone dose administrations were analyzed during a period of up to 6 days after hospital treatment initiation using a nonlinear mixed-effect model. Pretreatment with amiodarone before intensive care administration, paroxysmal versus persistent AT, catecholamine infusion, and fluid and magnesium loading were among the covariates assessed in the model. In case of paroxysmal AT in a patient not pretreated with amiodarone, a 300 mg intravenous loading dose combined with an 800 mg oral dose on the first day, followed by 800 mg/day orally for 4 days was effective in achieving a heart rate between 80 and 115 bpm within the first day, and to maintain it during the next 4 days. Corresponding doses were twice as high in patients with persistent AT. Use of intravenous magnesium (p < 0.02) and fluid loading (p < 0.02) was associated with an earlier and greater heart rate decrease, while use of dobutamine had an opposite influence (p < 0.05).

Conclusions

In critically ill patients with AT, the dose of amiodarone required to control heart rate is influenced by the type of AT and by other easily measurable conditions which may allow better individualization of amiodarone dosing.

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Correspondence to Joe-Elie Salem.

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No external funding was used in the preparation of this article.

Disclosures

Joe-Elie Salem, Maria El-Aissaoui, Margaux Alazard, Jean-Sébastien Hulot, Nadia Aissaoui, Jean-Yves Le-Heuzey, Christian Funck-Brentano, Christophe Faisy, and Saik Urien declare that they have no conflicts of interest.

Additional information

C. Faisy and S. Urien contributed equally to this work.

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Salem, JE., El-Aissaoui, M., Alazard, M. et al. Modeling of Amiodarone Effect on Heart Rate Control in Critically Ill Patients with Atrial Tachyarrhythmias. Clin Pharmacokinet 55, 991–1002 (2016). https://doi.org/10.1007/s40262-016-0372-9

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