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Glycated Hemoglobin is Associated with Glycemic Control and 6-Month Neurologic Outcome in Cardiac Arrest Survivors Undergoing Therapeutic Hypothermia

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Abstract

Background

Glucose control status after cardiac arrest depending on chronic glycemic status and the association between chronic glycemic status and outcome in cardiac arrest survivors are not well known. We investigated the association between glycated hemoglobin (HbA1c) and 6-month neurologic outcome in cardiac arrest survivors undergoing therapeutic hypothermia (TH) and whether mean glucose, area under curve (AUC) of glucose during TH, and neuron-specific enolase (NSE) are different between normal and high HbA1c groups.

Methods

This retrospective single-center study included adult comatose cardiac arrest survivors who underwent TH from September 2011 to December 2017. HbA1c and glucose were measured after return of spontaneous circulation (ROSC), and normal or high HbA1c was defined using cutoff value of 6.4% of HbA1c. Blood glucose was measured at least every 4 h and treated with a written protocol to maintain the range of 80–200 mg/dL. Hypoglycemia and hyperglycemia were defined with glucose < 70 or > 180 mg/dL. Mean glucose during induction and rewarming phase and AUC of glucose during every 6 h of maintenance were calculated, and NSE at 48 h after cardiac arrest was recorded. The primary outcome was unfavorable neurologic outcome, defined as Glasgow Pittsburgh Cerebral Performance Category scale 3–5 at 6 months after cardiac arrest.

Results

Of 384 included patients, 81 (21.1%) had high HbA1c and 247 (64.3%) had an unfavorable neurologic outcome. Patients with high HbA1c were more common in the unfavorable group than in favorable group (27.5% vs 9.5%, p < 0.001), and the unfavorable group had significantly higher HbA1c level (5.8% [5.4–6.8%] vs 5.6% [5.3–6.0%], p = 0.007). HbA1c level was independently associated with worse neurologic outcome (odds ratio 1.414; 95% confidence interval 1.051–1.903). High HbA1c group had higher glucose after ROSC, glucose AUC during maintenance, and rewarming phase than normal HbA1c group. High HbA1c group had significantly higher incidence of hyperglycemia throughout the TH, while normal HbA1c group had significantly higher incidence of normoglycemia. However, no glucose parameter remained as an independent predictor of neurologic outcome after adjustment, irrespective of HbA1c level. NSE showed good prognostic performance (area under curve 0.892; cutoff value 26.3 ng/mL). Although NSE level was not different between HbA1c groups, high HbA1c group had higher proportion of patient having NSE over cutoff.

Conclusions

Higher HbA1c was independently associated with unfavorable neurologic outcome. Glycemic status during TH was different between normal and high HbA1c groups.

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Acknowledgements

This work was approved by Chonnam National University Hospital Institutional Review Board (Protocol No. CNUH-2018-207).

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Authors and Affiliations

  1. Department of Emergency Medicine, Chonnam National University Hospital, 42 Jebong-ro, Dong-gu, Gwangju, Republic of Korea

    Byung Kook Lee, Dong Hun Lee & Kyung Woon Jeung

  2. Department of Emergency Medical Technology, Namseoul University, 91 Daehak-ro, Sebuk-gu, Cheonan, Republic of Korea

    Seong-Woo Yun

  3. Department of Emergency Medicine, University of Pittsburgh School of Medicine, Iroquois Building Suit 400A, 3600 Forbes Avenue, Pittsburgh, PA, 15213, USA

    Clifton W. Callaway & Jon C. Rittenberger

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  1. Byung Kook Lee
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  5. Clifton W. Callaway
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Contributions

BK Lee contributed to project development, data analysis, data interpretation, and manuscript writing; JC Rittenberger contributed to data interpretation and manuscript writing; DH Lee contributed to data collection and manuscript edition; SW Yun contributed to data collection and manuscript edition; KW Jeung contributed to data analysis and manuscript edition; CW Callaway contributed to data interpretation and manuscript edition.

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Correspondence to Jon C. Rittenberger.

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12028_2019_758_MOESM1_ESM.tif

Supplemental figure. Receiver operating characteristics of HbA1c for neurologic outcome and mortality. (A) HbA1c showed an area under curve of 0.583 (95% confidence interval, 0.532–0.633; p = 0.004) for unfavorable neurologic outcome and the cutoff value by Youden index was 6.3% (sensitivity, 30.4%; specificity, 89.8%). (B) HbA1c showed an area under curve of 0.593 (95% confidence interval, 0.542–0.642; p = 0.001) for 6-month mortality and the cutoff value by Youden index was 6.3% (sensitivity, 32.9%; specificity, 88.5%) (TIFF 536 kb)

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Lee, B.K., Lee, D.H., Jeung, K.W. et al. Glycated Hemoglobin is Associated with Glycemic Control and 6-Month Neurologic Outcome in Cardiac Arrest Survivors Undergoing Therapeutic Hypothermia. Neurocrit Care 32, 448–458 (2020). https://doi.org/10.1007/s12028-019-00758-9

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