Electrical cardioversion for persistent atrial fibrillation after treatment of thyrotoxicosis

Emery, Peter W.; Staffurth, J.

doi:10.1136/pgmj.58.686.746

Cited by 8 publications

(3 citation statements)

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“…The different recurrence rates in our study compared with others may be due to different AF durations and echocardiographic features. 21 - 24 A similar study has shown a risk of recurrence of 30% in the first year after cardioversion, which increased to 60 and 79% when the cardioversion was postponed to 12 and 36 months, respectively. 8 The risk of AF recurrence was lower in patients with hyperthyroidism when compared with those with euthyroidism, 8 although another study similar to ours found comparable rates in both groups.…”

Section: Discussionmentioning

confidence: 91%

“…A study conducted by Emery and Staffurth 24 has demonstrated that following a successful cardioversion, 45% of the patients maintain an SR during 2 years. This ratio decreased to 36% when the follow-up was longer (mean 7.4 years).…”

Section: Discussionmentioning

confidence: 99%

“…This ratio decreased to 36% when the follow-up was longer (mean 7.4 years). 24 Siu et al 8 have shown that AF recurrence rates 24 months after a successful cardioversion were 59% in patients with hyperthyroidism compared with 83% in those without thyroid dysfunction. 8 The risk of AF recurrence in our study was similar in patients with hyperthyroidism (14 patients, recurrence rate 43.8%) and euthyroidism (21 patients, recurrence rate 44.7%, p = 0.93).…”

Section: Discussionmentioning

confidence: 99%

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Predictors of Atrial Fibrillation Recurrence in Hyperthyroid and Euthyroid Patients

Gürdoğan¹,

Arı²,

Tenekecioğlu³

et al. 2016

Arquivos Brasileiros De Cardiologia

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BackgroundAtrial fibrillation (AF) is the most common arrhythmia in adults, and is encountered in 10-15% of the patients with hyperthyroidism. Unless euthyroidism is restored, pharmacological or electrical cardioversion is controversial in patients with AF who remain hyperthyroid.ObjectiveThe aim of this study was to assess the efficacy of electrical cardioversion and predictors of AF recurrence in hyperthyroid and euthyroid patients.MethodsThe study included 33 hyperthyroid (21 males) and 48 euthyroid (17 males) patients with persistent AF. The patients were sedated with intravenous midazolam before undergoing electrical cardioversion delivered by synchronized biphasic shocks. Rates of AF recurrence were recorded.ResultsMean follow-up was 23.63 ± 3.74 months in the hyperthyroid group and 22.78 ± 3.15 months in the euthyroid group (p = 0.51). AF recurred in 14 (43.8%) and 21 (44.7%) patients in each group, respectively (p = 0.93). Multivariate regression analysis in each group showed that AF duration was the only predictor of AF recurrence, with odds ratios of 1.38 (95% confidence interval [CI] = 1.05 - 1.82, p = 0.02) in the hyperthyroid group and 1.42 (95% CI = 1.05 - 1.91, p= 0.02) in the euthyroid group.ConclusionRates of long-term AF recurrence were similar in successfully cardioverted hyperthyroid and euthyroid patients. The only predictor of AF recurrence in both groups was AF duration.

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