Tools for Practice Outils pour la pratique


#3 Glucose Self-Monitoring in Type 2 Diabetics Not Using Insulin: Is it Bitter Sweet?


CLINICAL QUESTION
QUESTION CLINIQUE
What are the pros and cons of self-monitoring blood glucose for Type 2 diabetics not using insulin?


BOTTOM LINE
RÉSULTAT FINAL
Routine self-monitoring of blood glucose in Type 2 diabetics who do not use insulin has no clinical benefits, is not cost-effective, and may reduce quality of life.



CFPCLearn Logo

Reading Tools for Practice Article can earn you MainPro+ Credits

La lecture d'articles d'outils de pratique peut vous permettre de gagner des crédits MainPro+

Join Now S’inscrire maintenant

Already a CFPCLearn Member? Log in

Déjà abonné à CMFCApprendre? Ouvrir une session



EVIDENCE
DONNÉES PROBANTES
An individual-patient-level meta-analysis1 of six Randomized Controlled Trials (RCTs) with 2,552 patients managing their Type 2 diabetes without insulin: 
  • Mean HbA1c at baseline 8.3% (~1/4 had baseline HbA1c >9%). 
  • Self-monitoring of blood glucose reduced HbA1c by: 
    • 0.2% at six months. 
    • 0.35% at one year. 
    • This is below the minimum difference thought to be clinically important (>0.5%).2 
Systematic review3 of 12 RCTs (3,259 patients) also found: 
  • No difference in: 
    • Overall wellbeing or quality of life. 
    • Symptomatic hypoglycemic episodes. 
  • HbA1c reduced by 0.3%. 
RCT of 1,024 patients with median baseline HbA1c 7.3% 
  • Self-monitoring blood glucose weekly lowered HbA1c by only 0.12% compared to monitoring twice yearly.  
    • Despite highly-motivated patients and intensive follow-up in these RCTs, only one-third to one-half of patients adhered to the self-monitoring protocol over 12 months.4-7  
Context:  
  • Other systematic reviews8,9 and RCTs with more intensively-structured self-monitoring plans7 show similar, clinically insignificant differences. 
  • Trials thus far have been underpowered to evaluate the effect on clinical outcomes 
    • The achieved 0.2-0.35% HbA1c reduction would be expected to reduce clinical outcomes related to diabetes by a mere relative 3-8%.10 
    • Some RCTs6,11 and supporting studies12 show worsening depressive symptoms6,12 and negative impact on quality of life11,12 with self-monitoring. 
    • Regular self-monitoring is not cost-effective.11 
    • Eight public drug plans are spending $247 million/year on test strips,13 so the total Canadian expenditure would be far more. 
    • While regular self-monitoring in Type 2 diabetics not on insulin appears unnecessary, this population should still know how to test their blood glucose in case they have symptoms of hypoglycemia, they are feeling ill, or they are interested in seeing the impacts of lifestyle behaviors. 
Reviewed: August 19, 2016 by Ricky


Latest Tools for Practice
Derniers outils pour la pratique

#359 Topical corticosteroids for atopic dermatitis - More than skin deep

What are the benefits/harms of topical corticosteroids for atopic dermatitis in adults/children?
Read Lire 0.25 credits available Crédits disponibles

#358: Any berry good solutions to preventing UTIs: Cranberries?

Do cranberry products prevent recurrent urinary tract infections (UTIs)?
Read Lire 0.25 credits available Crédits disponibles

#357: Overcoming Resistance: Antipsychotics for difficult to treat depression

In patients with treatment-resistant depression, is adding an atypical antipsychotic to current therapy safe and effective?
Read Lire 0.25 credits available Crédits disponibles

This content is certified for MainPro+ Credits, log in to access

Ce contenu est certifié pour les crédits MainPro+, Ouvrir une session


Author(s)
Auteur(s)
  • Christina Korownyk MD CCFP
  • G. Michael Allan MD CCFP

1. Farmer AJ, Perera R, Ward A, et al. BMJ. 2012; 344:e486.

2. Type 2 diabetes mellitus, NICE guidelines. 2016. Available for download at: https://www.nice.org.uk/advice/ktt12/chapter/evidence-context. Last accessed: November 8, 2016.

3. Malanda UL, Welschen LMC, Riphagen II, et al. Cochrane Database Syst Rev. 2012; 1:CD005060.

4. Bosi E, Scavini M, Ceriello A, et al. Diabetes Care. 2013; 36:2887-94.

5. Farmer A, Wade A, Goyder E, et al. BMJ. 2007; 335:132-40.

6. O’Kane MJ, Bunting B, Copeland M, et al. BMJ. 2008; 336:1174-7.

7. Polonsky WH, Fisher L, Schikman CH, et al. Diabetes Care. 2011; 34:262-7.

8. Clar C, Barnard K, Cummins E, et al. Health Technol Assess. 2010; 14(12):1-140.

9. McIntosh B, Yu C, Lal A, et al. Open Medicine. 2010; 4:E102.

10. Stratton IM, Adler AI, Neil AW, et al. BMJ. 2000; 321:405-12.

11. Simon J, Gray A, Clarke P, et al. BMJ. 2008; 336:1177-80.

12. Franciosi M, Pellegrini F, De Berardis G, et al. Diabetes Care. 2001; 24:1870-7.

13. Cameron C, Virani A, Dean H, et al. Can J Diabetes. 2010; 34:34-40.

Authors do not have any conflicts of interest to declare.

Les auteurs n’ont aucun conflit d’intérêts à déclarer.