Insulin-Related Lipohypertrophy: Ultrasound Characteristics, Risk factors, and Impact of Glucose Fluctuations
Abstract BackgroundLipohypertrophy (LHT) has been suggested as an outcome of adipogenic effects of insulin injection-related tissue trauma. It is common clinically, but the current understanding of LHT by medical staff and diabetic patients is still insufficient, and it has not attracted attention as a research topic.ObjectiveThe aim of this study was to investigate the ultrasound characterization of LHT, to identify factors associated with the development of LHT by assessing the prevalence of LHT compared to both clinical palpation and ultrasound detection methods, and to further evaluate the possible impact of LHT on patients' blood glucose fluctuations.MethodA cross-sectional study was established, in which 120 patients with type 2 diabetes were selected. General information was registered in the form of a questionnaire, and the patients were evaluated for LHT by ultrasonography and clinical palpation of the abdomen. Patients were instructed to inject equal amounts of insulin in LHT and normal adipose tissue (NAT) on a non-consecutive 2 d in a selected week, and the possible effect of LHT on patients' blood glucose fluctuations was assessed using a continuous glucose monitoring system. .ResultsLHT has special ultrasonic signs. We found a high rate of missed clinical palpation of LHT compared with ultrasonography (P < 0.05). The duration of insulin treatment, whether to rotate the injection site, frequency of needle use, and number of insulin injections per day were the main factors influencing the development of LHT (P < 0.05). Compared to NAT, LHT resulted in elevated largest amplitude of glycemic excursion, mean blood glucose, standard deviation of blood glucose, and postprandial glucose excursion, and large fluctuations in blood glucose (P < 0.05).ConclusionUltrasonography can detect more LHT than can clinical palpation. The development of LHT is related to many factors and can lead to significant blood glucose fluctuations; thus, LHT should be given sufficient attention.