Dissanayake A, Vandal AC, Boyle V, Park D, Milne B, Grech R, Ng A. Does intensive glycaemic control promote healing in diabetic foot ulcers? - a feasibility study.
BMJ Open 2020;
10:e029009. [PMID:
31964660 PMCID:
PMC7044945 DOI:
10.1136/bmjopen-2019-029009]
[Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
INTRODUCTION
One in four diabetes patients will develop a foot ulcer over their lifetime. The role of glycaemic control in the healing of foot ulcers in diabetes patients is not supported by randomised controlled trial (RCT) data.
OBJECTIVES
To determine the feasibility of an RCT of glycaemic control with intensive insulin therapy in diabetic foot ulcer, by assessing: entry criteria, fasting capillary blood glucose (FCBG) medication satisfaction and sensitivity of different ulcer-healing endpoints to glycaemic control.
DESIGN
Two substudies: one cross-sectional and one single-arm prospective.
SETTING
Single-centre secondary care diabetic foot clinic in New Zealand.
PARTICIPANTS
Substudy 1: 78 participants consisting of all people ≥18 years with a diabetic foot ulcer presenting to the clinic over 35 weeks in 2015.Substudy 2: 15 participants from Substudy 1 consenting to intensive insulin therapy.
INTERVENTION
Substudy 1: None.Substudy 2: Intensive insulin therapy with standard podiatry care over 24 weeks.
OUTCOME
Substudy 1: Proportion of participants satisfying potential RCT entry criteria; medication satisfaction (Diabetes Medication Satisfaction).Substudy 2: FCBG, index ulcer healing time, index ulcer size, health-related quality of life (HRQoL; EuroQol 5 Dimensions 5 Levels and Diabetic Foot Ulcer Scale-Short Form).
RESULTS
Proportion in Substudy 1 satisfying all entry criteria was 31% (95% CI 21 to 42). FCBG values decreased between baseline and study end (difference -3.7 mmol/L, 95% CI -6.5 to -0.8); 83% (95% CI 44 to 95) of ulcers healed by 24 weeks. FCBG correlated negatively with medication satisfaction. Ulcer area logarithm was most sensitive to FCBG changes, displaying significant negative correlation with HRQoL outcomes. Detecting a 30% between-group difference in this outcome (80% power, α=5%) requires 220 participants per arm, achievable within 1 year with 15 centres similar to study setting.
CONCLUSIONS
An adequately powered RCT requires cooperation between a large number of centres. Ulcer area logarithm should be primary endpoint.
TRIAL REGISTRATION NUMBER
ANZCTR ACTRN12617001414303.
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