Cited by 111Diabetes Management and ResearchCardiac electrophysiology and arrhythmiasDiabetes and associated disorders

Diurnal differences in risk of cardiac arrhythmias during spontaneous hypoglycemia in young people with type 1 diabetes

Novodvorsky, Peter, Bernjak, Alan, Chow, Elaine, Iqbal, Ahmed, Sellors, Lianne, Williams, Scott, Fawdry, Robert A., Parekh, Bhavin +4 more·2017·Diabetes Care

Abstract

OBJECTIVE Hypoglycemia may exert proarrhythmogenic effects on the heart via sympathoadrenal stimulation and hypokalemia. Hypoglycemia-induced cardiac dysrhythmias are linked to the “dead-in-bed syndrome,” a rare but devastating condition. We examined the effect of nocturnal and daytime clinical hypoglycemia on electrocardiogram (ECG) in young people with type 1 diabetes. RESEARCH DESIGN AND METHODS Thirty-seven individuals with type 1 diabetes underwent 96 h of simultaneous ambulatory ECG and blinded continuous interstitial glucose monitoring (CGM) while symptomatic hypoglycemia was recorded. Frequency of arrhythmias, heart rate variability, and cardiac repolarization were measured during hypoglycemia and compared with time-matched euglycemia during night and day. RESULTS A total of 2,395 h of simultaneous ECG and CGM recordings were obtained; 159 h were designated hypoglycemia and 1,355 h euglycemia. A median duration of nocturnal hypoglycemia of 60 min (interquartile range 40–135) was longer than daytime hypoglycemia of 44 min (30–70) (P = 0.020). Only 24.1% of nocturnal and 51.0% of daytime episodes were symptomatic. Bradycardia was more frequent during nocturnal hypoglycemia compared with matched euglycemia (incident rate ratio [IRR] 6.44 [95% CI 6.26, 6.63], P < 0.001). During daytime hypoglycemia, bradycardia was less frequent (IRR 0.023 [95% CI 0.002, 0.26], P = 0.002) and atrial ectopics more frequent (IRR 2.29 [95% CI 1.19, 4.39], P = 0.013). Prolonged QTc, T-peak to T-end interval duration, and decreased T-wave symmetry were detected during nocturnal and daytime hypoglycemia. CONCLUSIONS Asymptomatic hypoglycemia was common. We identified differences in arrhythmic risk and cardiac repolarization during nocturnal versus daytime hypoglycemia in young adults with type 1 diabetes. Our data provide further evidence that hypoglycemia is proarrhythmogenic.

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Crossref · 10.2337/dc16-2177

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  • A1C has been used as the primary endpoint for many CGM studies.

    “A1C is currently recognized as the key surrogate marker for the development of longterm diabetes complications in people with type 1 and type 2 diabetes and has been used the primary endpoint for many CGM studies (1; 3; 4; 6; 32; 33).”

    From Clinical Targets for Continuous Glucose Monitoring Data Interpretation: Recommendations From the International Consensus on Time in Range (2019) · cites this paper as [32]

    The Baseline Assessment section says HbA1c was measured at the start of this study, while Research Design and Methods identifies arrhythmia-related measures as its outcomes. Searches for A1C as a primary endpoint in CGM studies found no passage in our copy addressing that claim; page numbers were not available. (LLM, conf=0.72)

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  • A1C is currently recognized as the key surrogate marker for the development of long-term diabetes complications in people with type 1 and type 2 diabetes.

    “A1C is currently recognized as the key surrogate marker for the development of longterm diabetes complications in people with type 1 and type 2 diabetes and has been used the primary endpoint for many CGM studies (1; 3; 4; 6; 32; 33).”

    From Clinical Targets for Continuous Glucose Monitoring Data Interpretation: Recommendations From the International Consensus on Time in Range (2019) · cites this paper as [32]

    The Baseline Assessment section says HbA1c was measured at the start of monitoring, but does not describe it as a surrogate marker for long-term complications. The Research Design and Methods section examines arrhythmias during hypoglycemia, not A1C as a primary endpoint in CGM studies. Searches for the surrogate-marker and primary-endpoint claims found no supporting passage in our copy. (LLM, conf=0.76)

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Authors
Novodvorsky, P., Bernjak, A., Chow, E., Iqbal, A., Sellors, L., Williams, S., Fawdry, R. A., Parekh, B., Jacques, R. M., Marques, J. L. B., Sheridan, P. J., & Heller, S. R.
Affiliations
  • Department of Oncology and Metabolism, University of Sheffield, Sheffield, U.K.
  • Insigneo (GB)
  • Sheffield Teaching Hospitals NHS Foundation Trust (GB)
  • University of Sheffield (GB)
Corresponding author
Heller, Simon R.
Venue
Diabetes Care
Published
2017-02-17
Volume
40
Issue
5
Pages
655-662
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
OpenAlex
W2588258146
Cited by
111
References
43
Citations by year
2026: 6 · 2025: 12 · 2024: 9 · 2023: 14 · 2022: 11 · 2021: 13 · 2020: 8 · 2019: 15 · 2018: 13 · 2017: 9
FWCI
9.72
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetes Care (publishedVersion)
  • PubMed (publishedVersion)
  • White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
Funders
  • National Institute for Health and Care Research (NF-SI-0515-10079, ACF-2014-04-002, BRF-2011-004)
  • Medical Research Council (MR/M00371X/1)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
type 1 diabetes, hypoglycemia, cardiac arrhythmias, nocturnal hypoglycemia, diurnal variation, bradycardia, cardiac repolarization, QTc prolongation, heart rate variability, asymptomatic hypoglycemia, youth
MeSH terms
Adult, Arrhythmias, Cardiac, Circadian Rhythm, Diabetes Mellitus, Type 1, Electrocardiography, Female, Heart Conduction System, Heart Rate, Humans, Hypoglycemia, Male, Risk Factors

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