An observational study comparing continuous subcutaneous insulin infusion (CSII) and insulin glargine in children with type 1 diabetes

Insulin Pump Therapy

BACKGROUND

Advances in pump technology have increased the popularity of this treatment modality among patients with type 1 diabetes and recently also among patients with type 2 diabetes.

AREAS OF UNCERTAINTY

Four decades after the incorporation of the insulin pump in clinical use, questions regarding its efficacy, occurrence rate of short-term complications as hypoglycemia and diabetes ketoacidosis, timing of pump initiation, and selected populations for use remain unanswered.

DATA SOURCES

A review of the literature was performed using the PubMed database to identify all articles published up till December 2018, with the search terms including insulin pump therapy/continuous subcutaneous insulin delivery. The Cochrane database was searched for meta-analysis evaluating controlled randomized trials. Consensuses guidelines published by the International Society for Pediatric and Adolescent Diabetes, American Diabetes Association, and Advanced Technologies and Treatments for Diabetes year books were additionally reviewed for relevant cited articles.

THERAPEUTIC ADVANCES

Insulin pump therapy offers flexible management of diabetes. It enables adjustment of basal insulin to daily requirements and circadian needs, offers more precise treatment for meals and physical activity, and, when integrated with continuous glucose monitoring, allows glucose responsive insulin delivery. The ability to download and transmit data for analysis allow for treatment optimization. Newer pumps are simple to operate and increase user experience. Studies support the efficacy of pump therapy in improving glycemic control and reducing the occurrence of hypoglycemia without increasing episodes of diabetes ketoacidosis. They also improve quality of life. Recent evidence suggests a role for pump therapy in reducing microvascular and macrovascular diabetes-related complications.

CONCLUSIONS

Insulin pump therapy appears to be effective and safe in people with T1D regardless of age. Future advancements will include incorporation of closed loop and various decision support systems to aid and improve metabolic control and quality of life.

Efficacy and Safety of Continuous Subcutaneous Insulin Infusion vs. Multiple Daily Injections on Type 1 Diabetes Children: A Meta-Analysis of Randomized Control Trials

OBJECTIVE

This meta-analysis was performed to evaluate the efficacy and safety of continuous subcutaneous insulin infusion (CSII) vs. multiple daily injections (MDI) in children with type 1 diabetes.

METHODS

A literature search was conducted on databases including PubMed and Embase up to June 2017. The pooled weighted mean difference or risk ratio as well as 95% confidence intervals were calculated using RevMan 5.3 software.

RESULTS

Eight studies involving 310 children with type 1 diabetes were included. Results showed that HbA1c (%) was significantly lower (p=0.007) after CSII compared with MDI in children with type 1 diabetes. In addition, there was no significant difference between groups in HbA1c (%) change, total daily insulin doses, change of total daily insulin doses and incidence of ketoacidosis and severe hypoglycemia. However, subgroup analyses indicated that age, treatment duration and study design were influenced the efficacy of CSII and MDI in children with type 1 diabetes.

CONCLUSION

CSII is associated with lower HbA1c levels in children with type 1 diabetes but appears to have no effect on insulin requirement or incidence of ketoacidosis and severe hypoglycemia.

Continuous subcutaneous infusion of insulin lispro in children and adolescents with type 1 diabetes mellitus

OBJECTIVE

To provide a comprehensive review of insulin lispro administered by continuous subcutaneous insulin infusion (CSII) in children and adolescents.

METHODS

We performed PubMed literature searches to identify clinical studies of insulin lispro administered via CSII within pediatric and adolescent populations.

RESULTS

Twenty-six studies involving 2521 pediatric patients with type 1 diabetes mellitus met inclusion criteria. Of these, 10 were randomized controlled trials (RCTs), 6 of which compared insulin lispro CSII with multiple daily injection (MDI) therapy. We identified 7 additional prospective, nonrandomized studies and 9 retrospective studies. Within the RCTs, endpoint hemoglobin A1c levels ranged from 6.3% to 8.5% for insulin lispro CSII therapy and from 6.2% to 8.7% for those trials with MDI comparator arms. In those trials that compared insulin lispro CSII with MDI, the endpoint hemoglobin A1c achieved with insulin lispro was similar or improved compared with observations in the MDI treatment arm. In the RCTs, severe hypoglycemia rates of 0.1 to 0.3 episodes/patient per year were reported for insulin lispro CSII therapy; those trials with MDI comparator arms reported relatively similar severe hypoglycemia rates (0.1 to 0.5 episodes/patient per year). Events of diabetic ketoacidosis (DKA) were rare. Where reported, insulin lispro CSII and MDI therapy demonstrated a similar occurrence of DKA and incidence of severe hypoglycemia. Prospective and retrospective studies demonstrated results similar to the RCT findings.

CONCLUSIONS

In 26 studies of more than 2500 pediatric and adolescent patients with type 1 diabetes, with more than 1000 patients specifically receiving insulin lispro CSII, insulin lispro CSII therapy consistently demonstrated similar or improved efficacy and safety vs studied comparators.

[Benefits of subcutaneous continuous insulin infusion in type 1 diabetic patients with high glycemic variability]

BACKGROUND

Hypoglycemia limits the efficacy of intensive insulin therapy, especially in patients with great glucose variability. The extent to which continuous subcutaneous insulin infusion (CSII) overcomes this limitation is unclear. Our aim was to determine whether CSII is helpful for decreasing glucose variability and hypoglycemia, mainly in patients with the greatest variability.

METHOD

Twenty-four patients with type 1 diabetes wore a continuous glucose monitoring system sensor for three days before starting therapy with CSII and 6 months later. Glucose variability (SD, MAGE, M) and hypoglycemia duration (area under the curve (AUC) <70mg/dL) were compared in all patients and in those with the greatest MAGE (highest quartile).

RESULTS

At 6 months, a decreased glucose variability was seen, as measured by MAGE, M, and SD (median: -28mg/dL (interquartile range, -48 to 1), p=0.03; -22(-40 to 0), p=0.04; -11(-23 to 0), p=0.009; respectively). Patients with the greatest initial glucose variability (MAGE quartile 4) showed a greater decrease in both MAGE (-47mg/dL (-103 to -34) vs -20 (-36 to 17), p=0.01) and AUC <70 (-10.7mg/dL x day (-15 to 0) vs -1.1 (-4.7 to 3.8), p=0.03) as compared to all others. Patients with longer initial hypoglycemia (AUC quartile 4) achieved a greater reduction in AUC <70 (-9.7mg/dL x day(-15 to -6.5) vs -0.08 (-2.9 to 3.8), p=0.003). A correlation was found between ΔMAGE-ΔAUC (r 0.4, p=0.03).

CONCLUSIONS

During CSII, glucose variability significantly decreased, especially in patients with the greatest initial variability. Hypoglycemia was also markedly less in patients with greater variability, with the greatest reduction occurring in those who experienced more marked hypoglycemia with CSII.

Past, present, and future of insulin pump therapy: better shot at diabetes control

With the advent of continuous subcutaneous insulin infusion therapy and the findings of the Diabetes Control and Complications Trial, the management of type 1 diabetes has changed drastically. Over the past 30 years since its development, the effectiveness of continuous subcutaneous insulin infusion has been assessed in comparison with other modes of intensive treatment. Additionally, improvements in pump delivery systems have been made. Here, the findings of the studies on pump therapy are reviewed. Selection criteria of patients for pump use and how to initiate pump therapy are presented. Finally, newer findings on continuous glucose sensors are discussed as the next era of pump therapy continues to focus on the goal of developing an artificial pancreas.

Treatment of diabetes mellitus using an external insulin pump: the state of the art

The aim of diabetes treatment is to achieve tight glucose control to avoid the development of chronic diabetic complications while reducing the frequency of hypoglycaemic episodes. Continuous subcutaneous insulin infusion (CSII) using an external pump is an intensive diabetes therapy recognized to improve metabolic control and glycaemic instability, and to reduce the frequency of severe hypoglycaemia. For years, the theoretical advantages of the insulin pump (constancy of basal delivery, adjustable basal rates, and low insulin depots allowing the reduction of glycaemic variability) have contributed to its reported superiority compared with multiple daily injections (MDI). However, insulin pump therapy is now challenged by new MDI regimens based on long-acting insulin analogues that could replace the use of CSII. As a consequence, health professionals now have to determine which patients are likely to benefit the most from CSII. Recently, several studies reported that children and adolescents, and patients whose blood glucose imbalance was initially the most pronounced with basal-bolus regimens, would particularly benefit from CSII. Other indications were also proposed in marginal clinical situations with highly selected patients in whom a significant improvement of blood glucose was demonstrated. Finally, the use of CSII in type 2 diabetic patients now appears to be a good alternative to the ineffective MDI regimens observed in some of these patients. However, past experience with CSII indicates that candidates for insulin pump therapy must be carefully selected and strongly motivated to improve their glucose control. Use of CSII also requires strict medical supervision by physicians and a regular programme of patient education by paramedical teams, to ensure optimal responsible use of this technique by healthcare professionals.

Effects of insulin pump vs. injection treatment on quality of life and impact of disease in children with type 1 diabetes mellitus in a randomized, prospective comparison

OBJECTIVE

Effects of pump treatment vs. four times daily injections were explored in children with diabetes with regard to quality of life and impact of disease as well as adverse effects and parameters of metabolic control.

METHODS

An open, parallel, randomized controlled prospective comparative study lasting 14 months was completed by 38 type 1 children with diabetes (age 4-16 yr) following a 3.5-months run-in phase. Standardized quality-of-life Pediatric Quality of life Inventory (PedsQL) and impact of disease scores were obtained every 3.5 months as well as regular medical parameters. Parallel treatment group data and longitudinal within-patient data were analysed for each treatment modality.

RESULTS

Within-patient comparisons of the two treatment modalities showed significant improvement in PedsQL and impact scores after pump treatment. Treatment group comparisons did not show significant improvement. Pump treatment resulted in decreased symptomatic hypoglycaemia and lowered haemoglobin A1c by 0.22% after run in.

CONCLUSIONS

Within-patient comparison suggests that metabolic control, frequency of severe hypoglycaemia (a threefold decrease), quality of life and impact of disease scores are improved by pump treatment in comparison to regular treatment with four daily insulin injections.

Severe hypoglycaemia and glycaemic control in Type 1 diabetes: meta-analysis of multiple daily insulin injections compared with continuous subcutaneous insulin infusion

AIMS

Continuous subcutaneous insulin infusion (CSII) is a recommended treatment for reducing severe hypoglycaemia in Type 1 diabetes, but the change in hypoglycaemia compared with multiple daily insulin injections (MDI) is unclear. We therefore conducted a meta-analysis comparing severe hypoglycaemia and glycaemic control during CSII and MDI.

METHODS

Databases and literature (1996-2006) were searched for randomized controlled trials (RCTs) and before/after studies of > or = 6 months' duration CSII and with severe hypoglycaemia frequency > 10 episodes/100 patient years on MDI.

RESULTS

In 22 studies (21 reports), severe hypoglycaemia during MDI was related to diabetes duration (P = 0.038) and was greater in adults than children (100 vs. 36 events/100 patient years, P = 0.036). Severe hypoglycaemia was reduced during CSII compared with MDI, with a rate ratio of 2.89 (95% CI 1.45 to 5.76) for RCTs and 4.34 (2.87 to 6.56) for before/after studies [rate ratio 4.19 (2.86 to 6.13) for all studies]. The reduction was greatest in those with the highest initial severe hypoglycaemia rates on MDI (P < 0.001). The mean difference in glycated haemoglobin (HbA(1c)) between treatments was less for RCTs [0.21% (0.13-0.30%)] than in before/after studies [0.72% (0.55-0.90%)] but strongly related to the initial HbA(1c) on MDI (P < 0.001).

CONCLUSIONS

The severe hypoglycaemia rate in Type 1 diabetes was markedly less during CSII than MDI, with the greatest reduction in those with most severe hypoglycaemia on MDI and those with the longest duration of diabetes. The biggest improvement in HbA(1c) was in those with the highest HbA(1c) on MDI.

Basal insulin supplementation in Type 1 diabetic children: a long-term comparative observational study between continuous subcutaneous insulin infusion and glargine insulin

No long-term data are available on the efficacy of glargine insulin in comparison with continuous sc insulin infusion (CSII) in children and adolescents affected by Type 1 diabetes (T1D). Our aim was to compare the 2-yr efficacy of the 2 insulin approaches, in order to know how to best supply basal insulin in these patients. Thirty-six 9 to 18-yr-old consecutive children with at least 3 yr previous T1D diagnosis were enrolled. As part of routine clinical care, the patients consecutively changed their previous insulin scheme (isophane insulin at bedtime and human regular insulin at meals) and were randomly selected in order to receive either multiple daily injections (MDI) treatment with once-daily glargine and human regular insulin at meals, or CSII with aspart or lispro insulin. Both groups showed a significant decrease in glycosylated hemoglobin (HbA1c) values during the 1st year of therapy, though only in the CSII treated children was the decrease also observed during the 2nd year. The overall insulin requirement significantly decreased only in the CSII group and exclusively during the 1st year, while no significant differences were observed concerning body mass index SD score, severe hypoglycemic episodes and basal insulin supplementation. The work illustrates the first long-term study comparing the efficacy of CSII to MDI using glargine as basal insulin in children. Only with CSII were better HbA1c values obtained for prolonged periods of time, so that CSII might be considered the gold standard of intensive insulin therapy also for long-term follow-ups.

Assessing glycemia in type 1 diabetic patients using a microdialysis system for continuous glucose monitoring

BACKGROUND

Continuous glucose monitoring systems can monitor moment-to-moment changes in blood glucose concentration, which cannot be detected by intermittent self-monitoring. Continuing monitoring systems may lead to improved glycemic control. We evaluated a microdialysis technique for improving glycemic control in type 1 diabetes patients treated by different means of basal insulin substitution.

PATIENTS AND METHODS

Fifty-two type 1 diabetic patients on twice daily NPH and pre-meal aspart insulin were randomized in two groups: the continuation of NPH (n=26) (group 1) or once daily glargine (n=26) (group 2). 48-hour GlucoDay registrations were started at the beginning and after 4 months.

RESULTS

At baseline, time spent in the euglycemic range (glucose between 3.9 and 8.0 mmol/L) was 37.96+/-6.81% for the NPH group and 35.83+/-6.24% for the glargine group. At endpoint, time in the euglycemic range increased in both groups (51.02+/-7.22% and 57.29+/-10.27%, P<0.001 vs. before treatment for both groups). Time spent in the hypoglycemic range (glucose <3.9 mmol/L) was 9.+/-2.57% for the first group and 10.24+/-3.55% for the second group at baseline. At endpoint, time in the hypoglycemic range decreased in both groups (8.00+/-2.13% and 6.59+/-2.04%, P<0.001 vs. before treatment for both groups).

CONCLUSION

The analysis of the GlucoDay data gave us information about glycemia other than HbA1c and self-monitoring of blood glucose, such us a peakless activity profile and the lower percentage of time spent in the hypoglycemic range in the glargine-treated group.

[Insulin glargine in intensively-treated type 1 diabetes mellitus]

OBJECTIVES

To evaluate the use of insulin glargine in intensively-treated children and adolescents. To assess the degree of patient and parent satisfaction with this treatment.

PATIENTS AND METHODS

We studied 42 patients with type 1 diabetes. There were 27 girls and 15 boys. The mean age at diagnosis was 6.8 years (range 1.2-13.2), the mean age at initiation of glargine therapy was 12.8 years (range 7.0-17.7), and the mean duration of diabetes was 6.1 years (range 2.0-11.9). Glargine indications were poor metabolic control or frequent hypoglycemia with multiple daily injections of NPH insulin, which were substituted by one dose of glargine. Patient and parent satisfaction with diabetes treatment was assessed with the scale published by Boot. ANOVA, Student's t test, Mann-Whitney and Fisher tests were applied.

RESULTS

Variables are reported as mean 6 standard deviation. After 18 months, glargine reduced hemoglobin A1c levels (7.65 % +/- 0.74 vs. 8.03 % +/- 0.69; p = 0.001), with no significant changes in insulin dose (1.03 +/- 0.19 U/kg/day vs. 1.08 +/- 0.21; p = 0.052) or body mass index SDS (standard deviation score) (+0.51 +/- 0.96 vs. 10.61 +/- 1.02; p = 0.11). Glargine also increased patient satisfaction (+44.5 +/- 18.8 points vs. -9.9 +/- 26.8; p < 0.001) and parent satisfaction (+42.0 +/- 17.9 points vs. -20.8 +/- 29.1; p < 0.001) with diabetes treatment.

CONCLUSIONS

1. Glargine insulin improves metabolic control in intensively-treated children and adolescents with type 1 diabetes. 2. Glargine also improves patient and parent satisfaction with diabetes treatment.

Current practice of insulin pump therapy in children and adolescents - the Hannover recipe

Increasing evidence points to the importance of achieving low blood glucose variability and also a low hemoglobin A1c (HbA1c) to prevent diabetic late complications. Continuous subcutaneous insulin infusion (CSII) is associated with lower blood glucose variability in children. Frequent indications for starting CSII in youth are recurrent hypoglycemia, need for increased flexibility, poor glycemic control, dawn phenomenon, or needle phobia. At our center, about one-third of all patients across all age groups are currently on CSII. Although the average glycemic control is not very different from those on multiple daily injections, fewer patients are seen in the segment of very high and very low HbA1c with CSII. Across centers, the 'recipes' tailoring CSII treatment to individual patients and cultures are based more on experience than on evidence. However, several typical pediatric features have been identified. Patterns of the hourly basal rate and prandial insulin requirements vary with age. While many adolescents have increased requirements at dawn and dusk, young children show increasing needs in the second half of the day. Low insulin requirements, particularly in neonates, may need insulin dilution. The selection of catheters and needles has to be appropriate for the age. The opportunity to have an electronic memory read-out of all entries and alarms offers new possibilities of therapeutic monitoring, particularly in those youth not keeping good logbooks. This feature can be helpful, if a trustful relationship between the diabetes team and the family is established.

An Update on the Long-Acting Insulin Analogue Glargine

For both type 1 and type 2 diabetes, tight glycaemic control is vital to reduce the risk of long-term complications. However, this must be achieved with minimal risk of hypoglycaemia. Glargine is a new long-acting insulin analogue with an action profile designed to overcome this and has now been in clinical use for a number of years. In many countries glargine is widely used. Here we present an update on the clinical information available on glargine with respect to glycaemic control, the risk of hypoglycaemia and quality of life in both type 1 and type 2 diabetes.

Insulin analogues in children and teens with type 1 diabetes: advantages and caveats

This article reviews the advantages to and caveats of the use of newer insulin formulations (insulin analogues) and regimens in children and teens who have type 1 diabetes, their affect on glycemic control, frequency of hypoglycemic events, daily insulin requirements, and adverse affects such as excessive weight gain, which provides a further major challenge in adolescents. We also address briefly the use of adjunctive agents in the treatment of type 1 diabetes in children and teens.

A cross-sectional international survey of continuous subcutaneous insulin infusion in 377 children and adolescents with type 1 diabetes mellitus from 10 countries

OBJECTIVE

To document current practices using continuous subcutaneous insulin infusion (CSII) by downloading electronically the 90-d pump data held within the pump memory and relating that to clinical data from children and adolescents in different pediatric diabetes centers from Europe and Israel.

METHODS

Data of patients (1-18 yr) treated with CSII in 23 centers from nine European countries and Israel were recorded with the encapture software (PEC International, Frankfurt, Germany). The number of patients who participated was 377 (48% female; mean diabetes duration +/- SD: 6.8 +/- 3.7 yr; age: 12.9 +/- 3.8 yr, preschool n = 33; prepubertal n = 95; adolescent n = 249; CSII duration: 1.6 +/- 1.2 yr; local HbA1c: 8.1 +/- 1.2%).

RESULTS

The total insulin dose was lower than previously reported for injection therapy (0.79 +/- 0.20 U/kg/d). Covariance coefficient of daily total insulin was high in all age groups (adolescents 19 +/- 9%, prepubertal 18 +/- 8 and preschool 17 +/- 8). The distribution of basal insulin infusion rates over 24 hr (48 +/- 12% of total dose) varied significantly between centers and age groups. The number of boluses per day (7 +/- 3) was not significantly different between the age groups (average daily bolus amount: 0.42 +/- 0.16 U/kg). The rate of severe hypoglycemia (coma/convulsions) was 12.4 episodes per 100 patient-years and the number of diabetes-related hospital days was 124 per 100 patient-years.

DISCUSSION

Pediatric CSII patients show a high variability in their insulin therapy. This relates both to age-dependent differences in the distribution of basal insulin as to the age-independent day-to-day variation in prandial insulin.