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Online Letters: Observations

Prevalence of Muscle Cramps in Patients With Diabetes

  1. Hans Katzberg1⇑,
  2. Seint Kokokyi1,
  3. Elise Halpern2,
  4. Eric Lovblom2,
  5. Carolina Barnett1,
  6. Drew Hume2,
  7. Vera Bril1 and
  8. Bruce Perkins2
  1. 1Division of Neurology, University Health Network, Toronto, Ontario, Canada
  2. 2Division of Endocrinology, Mount Sinai Hospital, Toronto, Ontario, Canada
  1. Corresponding author: Hans Katzberg, hans.katzberg{at}utoronto.ca.
Diabetes Care 2014 Jan; 37(1): e17-e18. https://doi.org/10.2337/dc13-1163
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There are limited epidemiological studies addressing the prevalence of muscle cramps in the general population and diseases like diabetes (1). Common long-term complications of diabetes, such as neuropathy and nephropathy, have been associated with higher rates of muscle cramps (2).

We aimed to determine the prevalence and characteristics of muscle cramps in patients with diabetes compared with healthy volunteers. Frequency, severity (using visual analog scale [VAS]), duration, and disability due to muscle cramps were evaluated, as is standard in clinical trials. Information about each patient’s clinical status was collected, including patient demographics, neuropathy (diagnosed using established clinical and electrophysiological criteria and quantitated using the Toronto Clinical Neuropathy Score) (3), diabetes complications, duration and type of diabetes, concurrent cramp-inducing (β-blockers, diuretics, statins) and cramp-protecting (quinine, calcium channel blockers, antiepileptics) medications, and markers of glycemic control (HbA1c).

Baseline demographics and cramp characteristics for 269 patients with diabetes (type 1 diabetes, n = 87; type 2 diabetes, n = 144) or healthy volunteer (n = 38) status are presented in Table 1. The age-adjusted prevalence of cramps was higher in patients with type 2 diabetes (65.2 vs. 45.5%; P = 0.009) but not type 1 diabetes (61.2 vs. 45.5%; P = 0.13) compared with healthy volunteers. Patients with type 1 diabetes (5.8 vs. 3.8 out of 10 on VAS; P = 0.006) and type 2 diabetes (6.7 vs. 3.8 out of 10 on VAS; P < 0.001) had more severe cramps than healthy volunteers. More type 2 diabetes patients reported that cramps were disabling compared with healthy volunteers (33.3 vs. 0%; P = 0.0008). In patients with diabetes, neuropathy (odds ratio, 3.34; 95% CI 1.62–7.11; P = 0.0009) and type of diabetes (odds ratio, 2.80; 95% CI 1.29–6.24 in type 2 vs. type 1 diabetes; P = 0.0095) were independent predictors of muscle cramps, while age, sex, and nephropathy were not.

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Table 1

Demographics and cramp characteristics in healthy volunteers, type 1 diabetes, and type 2 diabetes

Studies evaluating prevalence of neuropathy in diabetes have come from observational studies or treatment trials where there has not been characterization of cramps or adjustment for confounders (1,4). The unadjusted prevalence of cramps in our patients was consistent with these reports: 75.5% in type 2 diabetes (range, 45–78%) and 57.5% in type 1 diabetes (range, 24–34%). Neuropathy, a risk factor for development of cramps on the basis of peripheral nerve hyperexcitability (5) was found to be the most important factor determining development of cramps in our diabetic cohort. Nephropathy, which also occurs at a high rate in diabetes and has been associated with cramps, was not an independent predictor in our cohort. Limitations include lack of a validated questionnaire for cramps, younger control group, and lack of data on factors relevant to cramps such as pregnancy, hepatic dysfunction, arterial hypertension, vitamin levels, and electrolyte status. In spite of these limitations, the current study shows that muscle cramps are prevalent, severe, and disabling in patients with type 2 diabetes. Muscle cramps do not appear to be more prevalent or disabling in patients with type 1 diabetes; however, more studies are needed to confirm these findings and evaluate mechanisms underlying the development of cramps in diabetes. We recommend that treatment trials in patients with diabetes include muscle cramps as an outcome measure.

Acknowledgments.

The authors thank Emily Yeung (Division of Neurology, University Health Network, Toronto, Ontario, Canada) and Rachel Yang (Division of Neurology, University Health Network, Toronto, Ontario, Canada) for their work in recruiting patients, conducting electromyography, and collecting data.

Duality of Interest. No potential conflicts of interest relevant to this article were reported.

Author Contributions. H.K. created the questionnaire evaluating the frequency, severity, and duration of muscle cramps and disability due to muscle cramps; contributed to the statistical analyses; and wrote the manuscript. S.K. and C.B. contributed to the statistical analyses and edited the manuscript. E.H. maintained the database and edited the manuscript. E.L. maintained the database, helped with the statistical analyses, and reviewed the manuscript. D.H. maintained the database and reviewed the manuscript. V.B. contributed to the study design and edited the manuscript. B.P. contributed to the study design, overlooked the study, took responsibility for financial/funding support, and edited the manuscript. H.K. is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

  • © 2014 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

References

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    . The prevalence of symptoms of sensorimotor and autonomic neuropathy in Type 1 and Type 2 diabetic subjects. J Diabetes Complications 2004;18:27–31
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    . Muscle cramps. Muscle Nerve 2005;32:431–442
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    . Validation of the Toronto Clinical Scoring System for diabetic polyneuropathy. Diabetes Care 2002;25:2048–2052
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Prevalence of Muscle Cramps in Patients With Diabetes
Hans Katzberg, Seint Kokokyi, Elise Halpern, Eric Lovblom, Carolina Barnett, Drew Hume, Vera Bril, Bruce Perkins
Diabetes Care Jan 2014, 37 (1) e17-e18; DOI: 10.2337/dc13-1163

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Prevalence of Muscle Cramps in Patients With Diabetes
Hans Katzberg, Seint Kokokyi, Elise Halpern, Eric Lovblom, Carolina Barnett, Drew Hume, Vera Bril, Bruce Perkins
Diabetes Care Jan 2014, 37 (1) e17-e18; DOI: 10.2337/dc13-1163
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