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A pilot study investigating the effects of remote ischemic preconditioning in high-risk cardiac surgery using a randomised controlled double-blind protocol

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An Invited Editorial to this article was published on 20 March 2012

An Invited Editorial to this article was published on 18 March 2012

Abstract

The efficacy of remote ischemic preconditioning (RIPC) in high-risk cardiac surgery is uncertain. In this study, 96 adults undergoing high-risk cardiac surgery were randomised to RIPC (3 cycles of 5 min of upper-limb ischemia induced by inflating a blood pressure cuff to 200 mmHg with 5 min of reperfusion) or control. Main endpoints were plasma high-sensitivity troponin T (hsTNT) levels at 6 and 12 h, worst post-operative acute kidney injury (AKI) based on RIFLE criteria, and noradrenaline duration. hsTNT levels were log-normally distributed and higher with RIPC than control at 6-h post cross-clamp removal [810 ng/ml (IQR 527–1,724) vs. 634 ng/ml (429–1,012); ratio of means 1.41 (99.17% CI 0.92–2.17); P=0.04] and 12 h [742 ng/ml (IQR 427–1,700) vs. 514 ng/ml (IQR 356–833); ratio of means 1.56 (99.17% CI 0.97–2.53); P=0.01]. After adjustment for baseline confounders, the ratio of means of hsTNT at 6 h was 1.23 (99.17% CI 0.88–1.72; P=0.10) and at 12 h was 1.30 (99.17% CI 0.92–1.84; P=0.05). In the RIPC group, 35/48 (72.9%) had no AKI, 5/48 (10.4%) had AKI risk, and 8/48 (16.7%) had either renal injury or failure compared to the control group where 34/48 (70.8%) had no AKI, 7/48 (14.6%) had AKI risk, and 7/48 (14.6%) had renal injury or failure (Chi-squared 0.41; two degrees of freedom; P = 0.82). RIPC increased post-operative duration of noradrenaline support [21 h (IQR 7–45) vs. 9 h (IQR 3–19); ratio of means 1.70 (99.17% CI 0.86–3.34); P=0.04]. RIPC does not reduce hsTNT, AKI, or ICU-support requirements in high-risk cardiac surgery.

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Acknowledgments

This study was funded by unrestricted grants from the New Zealand Lotteries Commission and the National Heart Foundation of New Zealand.

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Correspondence to Paul Jeffrey Young.

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To this article two Invited Editorials are available at doi:10.1007/s00395-012-0258-4 and doi:10.1007/s00395-012-0259-3.

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Young, P.J., Dalley, P., Garden, A. et al. A pilot study investigating the effects of remote ischemic preconditioning in high-risk cardiac surgery using a randomised controlled double-blind protocol. Basic Res Cardiol 107, 256 (2012). https://doi.org/10.1007/s00395-012-0256-6

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  • DOI: https://doi.org/10.1007/s00395-012-0256-6

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