Evaluation of diabetic patients after three month use of continuous subcutaneous insulin infusion, dispensed by a protocolled form at outpatient reference clinic of Taguatinga Regional Hospital

Abstract

Objective

To evaluate the data of continuous subcutaneous insulin infusion protocol (CSII) for diabetics waived by the Health State Secretariat of Distrito Federal (HSSDF) and therapeutic responses three months after the transfer of multiple daily injections regimen for CSII.

Subjects and methods

Eighty patients (49 female) took part in this experimental study, mean age and disease duration were 27.9 years and 13 years, respectively; 96% patients had type 1 diabetes mellitus.

Results

The entire sample (ECO) and 3 subgroups (group 1 – A1c decrease, group 2 – A1c stable, and group 3 – A1c increase), stratified according to a ≥ 0.5% change in A1c, were analyzed. Group 1 involved 64% of the patients. The ECO showed a significant A1c decrease: MDI 8.1 ± 1.4% vs. CSII 7.3 ± 0.9%, p < 0.0001 (0.8% difference pro CSII therapy). Group 1 demonstrated an A1c decrease from 8.7% to 7.3% (1.4% difference). Group 2 mean A1c was 7.1%. Rate of hypoglycemia (< 50 mg/dL) decreased 61% in the ECO and 79% in Group 2.

Conclusion

This study reinforces the safety and efficacy of CSII with a robust A1c reduction and hypoglycemia. The pioneer care HSSDF ambulatory attests to be achievable the free dispensing by Unified Health System (UHS) following a protocol, and this approach results in less wastage to the patient and represents a rational policy of therapy with CSII for UHS. Arch Endocrinol Metab. 2015;59(1):23-8

Type 1 diabetes mellitus; multiple daily injections; insulin pump; continuous subcutaneous insulin infusion; hypoglycemia; Unified Health System (UHS-SUS)

INTRODUCTION

The need to maintain glucose as close to normal as possible in diabetic is a crucial condition to prevent chronic complications associated with the disease. Thus, the fundamental of treatment management of diabetes mellitus type 1 (DM1) is the “physiological replacement of insulin”, and the main examples are therapy with multiple daily injections (MDI) and the continuous subcutaneous insulin infusion (CSII) (¹).

One parameter of the goals of glycemic control is glycosylated hemoglobin (A1c) less than 7% (¹). However, this goal was not easy achieved in DM1 previous studies: only 7% of 4,750 patients in Scotland (²), 13% in Australia (³) and 11.6% in Brazil (⁴). Thus, several specialty societies recognize that CSII is an effective therapeutic option in the treatment of DM1 and particular cases of type 2 diabetes (DM2) (⁵,⁶).

Besides the failure to obtain good control with MDI (A1c ≤ 7.0%) or poor secondary control to the presence of recurrent Ketoacidosis (⁶), other indications of CSII are severe hypoglycemia characterized by loss of consciousness, seizures or need assistance from others; unrecognized hypoglycemia (dysautonomia) in which the patient does not recognize the symptoms of hypoglycemia by lack of noradrenergic response; unstable glycemic control, with extreme swings in blood glucose with MDI, for example, before autonomic gastroparesis (⁶).

The CSII can be discontinuous if there were sustained improvement in A1c concentrations, improvement in the frequency and severity of hypoglycemia, psychiatric contraindications and recurrent skin infections or if the patient decides to return to MDI therapy. However, in most centers, the discontinuation rate is low, around 5% (¹).

The CSII has been using at the Endocrinology Unit (Endo) of the Taguatinga Regional Hospital (HRT) since 2008, the year the CSII outpatient clinic was set up. This was a pioneering initiative of the public health system of Brazil – Unified Health System (UHS-SUS), initially for clinical evaluation of diabetics who managed the equipment CSII using legal action.

In 2009, during a workshop regarding the CSII implementation use in Brasilia, the Coordination of Education Program and Control of Diabetes (CEPCD) of the Health State Secretariat of Distrito Federal (HSSDF), currently the Coordination Center of Diabetes (CCD), presented to coordinators of regional CEPCD of HSSDF the Protocol CSII based on HRT experience (⁷). The Protocol, in its initial phase at that time, showed impressive results: the reduction of the legal actions with exclusion rate of 33% for medical indications inadequate, among other causes (⁷).

One of the duties of scientific and specialty societies is to establish standards and procedures for the proper use and guide the provision in public health as well, taking into account the real indications, safety and efficacy of devices and systems for therapy among diabetic people which include CSII. In this scenario, the CCD has emerged nationally as a pioneer in the CSII provision to its users in accordance to the guidelines of the Brazilian Diabetes Society – SBD (2008) (⁸) and American Diabetes Association – ADA (2004) (⁹).

The aim of this study was to evaluate protocol data of CSII dispensation for diabetics in HSSDF, in outpatients treated in Endo/HRT, and therapeutic responses three months after the transfer scheme from MDI to CSII, in relation to frequency of episodes of severe hypoglycemia and total, and metabolic control with the analysis of glycosylated hemoglobin.

SUBJECTS AND METHODS

This is a prospective, experimental study. Data was evaluated in the treatment of patients with DM before and after three months of change MDI scheme for CSII. All patients using the CSII which were treated at outpatients reference clinic for CCD/HSSDF, in Endo/HRT were included.

Anthropometric, laboratory, and capillary glucose data were collected from patient previous forms of inclusion and/or follow-up to use the CSII or by attendance at the assessment or reassessment three months after beginning therapy with CSII. The following data were collected: clinical history, age, laboratory tests, weight, height, body mass index (BMI), and blood pressure (BP). Before starting the CSII therapy, the diabetic was evaluated according to the protocol for the use of CSII/HSSDF, for A1c, total hypoglycemia and severe hypoglycemia with MDI therapy.

Evaluations of A1c (HPLC method, Bio-Rad, Brazil) after venous blood samples and following the reference values of 4.0% to 6.5%. The A1c results after the implementation of CSII were compared to those obtained with the MDI by analysis of three groups: A1c decrease above 0.5%; A1c stable, with a variation of less than 0.5%; and A1c increase.

Diabetic patients were also divided into two groups according to A1c concentrations before using CSII: group A – A1c equal to or greater than 8.0% and group B with A1c basal low than 8.0%, to determine the benefits of CSII therapy.

The total number of hypoglycemic events (< 70 mg/dL), severe events (< 50 mg/dL), and the number of self-monitoring of blood glucose (SMBG) were obtained via software management with the diabetes Accu-Chek 360°^® (Roche Diagnostics) or by analysis of the glucose meters when the glucose meters in use was not been by standardized model for HSSDF.

The inclusion criteria were patients using the CSII who have been treated in outpatients reference clinic for CCD/HSSDF in Endo/HRT. Patients presenting with any one of the following criteria have been excluded: 1) CSII use before inclusion in the protocol; 2) inability to understand the nature, scope and possible consequences of the study and/or evidence of uncooperative attitude; 3) any condition that increases the risk of the patient or decrease the chance of obtaining satisfactory data to achieve the objectives of the study; and 4) not performing the measurement of A1c in the study period.

Statistical analysis has been performed with SAS version 9.2. Data has been expressed as mean ± standard deviation (SD). We used the paired Student t test for comparison of variables before (MDI) and after CSII therapy. To observe specific behaviors, the Wilcoxon nonparametric test has been applied in stratified subgroups (A1c decreased, stable or increased). The analysis of variance (ANOVA) was performed to compare the mean baseline characteristics between groups stratified (age, time since diagnosis, and BMI) and gender (time of diagnosis, BP and SMBG) and the Tukey test was applied too. The level of significance has been set at p ≤ 0.05.

RESULTS

Eighty-eight patients were evaluated; however, eight were excluded because they have been already using CSII before inclusion in the protocol. Regarding the 80 included patients, seventy (88%) received CSII treatment by simple internal application by the counsel of HSSDF and 10 (13%) via legal actions though court orders.

The patient attended came from both public and private care with the referral of a specialist. Referrals are only accepted from patients followed by endocrinologists and appropriate treatment like regimen of MDI in use of insulin analogues and carbohydrate counting.

As shown in table 1, the majority of patients (96%) had DM1, two (2.5%) had DM secondary to pancreatitis and one (1.5%) had DM2. Females predominated (61.2%), aged between 2 and 72 years and the time of diagnosis of DM ranged from 2 to 43 years, with no statistical difference between genders. The BMI ranged from underweight and class 1 obesity (16.9 to 33.2 kg/m²). The majority of patients had normal blood pressure and the frequency of SMBG (average/month/day) at the analysis moment was 5.37 ± 2.0, similar between genders for both parameters.

Table 1
Characteristics of diabetic patients included in the program of continuous subcutaneous insulin infusion

Characteristics	Female (%)	Male (%)	Total (%)
Diabetics n(%)	49 (62)	31 (38)	80 (100)
Type 1 diabetes n(%)	47	30	77 (96)
Secundary diabetes n(%)	1	1	2 (2,5)
Type 2 diabetes n(%)	1	0	1 (1,5)
Age – years (mean ± SD)	29.7 ± 14	25.1 ± 17	27.9 ± 15.4
Time since diagnostic – years (mean ± SD)	14.8 ± 8.8	11.6 ± 9.1	13.6 ± 9.1
Body mass index – kg/m2 (mean ± SD)	22.7 ± 3.6	22 ± 3.7	22.6 ± 3.7
Systolic blood pressure – mmHg (mean ± SD)	114.8 ± 16	117.9 ± 20	116.1 ± 18
Diastolic bood pressure – mmHg (mean ± SD)	70.6 ± 10	67.2 ± 14	69.3 ± 12
Self-monitoring – mean/day/month (mean ± SD)	5.38 ± 1.6	5.34 ± 1.9	5.37 ± 2.0

• Basal characteristics between the genders (time since diagnosis, blood pressure and self-monitoring) were not statistically significant.
• Data obtained from the Central coordination of diabetes – HSSDF – Program of therapy and monitoring.
• Diabetic patients after continuous subcutaneous insulin infusion

The average of A1c decreased significantly: 0.8% after three months of change to CSII therapy. Table 2 shows the sample behavior in the analysis of A1c after CSII use. The groups showed no significant difference in age, DM duration and BMI.

Table 2
Reviews of blood concentrations of glycosylated hemoglobin (A1c) in response to treatment with the continuous subcutaneous insulin infusion (CSII)

	Total	Decrease (decrease A1c ≥ 0.5%)	Stable (decrease A1c < 0.5%)	Increase (increase A1c)
Diabetics n(%)	80	51 (63,7%)	15 (18,7%)	14 (17,5%)
Age – years (mean ± SD)	27.9 ± 15.4	28.2 ± 15.6	28.9 ± 14	25.9 ± 16.6
Gender female/ male (n)	49/31	31/20	9/6	9/5
Time since diagnostic – years (mean ± SD)	13.6 ± 9.1	13.5 ± 8.8	15 ± 9.9	12.5 ± 9.7
Body mass index – kg/m2 (mean ± SD)	22.6 ± 3.7	22.5 ± 3.9	23.5 ± 4.0	22.3 ± 3.2
A1c (%) in MDI (mean ± SD)	8.1 ± 1.4	8.7 ± 1.33	7.3 ± 0.8	6.8 ± 0.8
A1c (%) in CSII† (mean ± SD)	7.3 ± 0.9a	7.3 ± 0.9b	7.1 ± 0.7c	7.5 ± 0.6d
Diabetics with hypoglycemia (n)	66	39	14	13
Hypoglycemia‡ – MDI (mean ± SD)	18.7 ± 16.4	13.4 ± 12	24.6 ± 16.9	28.6 ± 21.7
Hypoglycemia‡ – CSII (mean ± SD)	11.9 ± 7.9e	11.8 ± 8f	14.3 ± 7.3g	9.8 ± 7.6h
Severe hypoglycemia§ – MDI (mean ± SD)	5.3 ± 8.8	4.1 ± 5.8	7.6 ± 15.4	6.5 ± 6.6
Severe hypoglycemia§ – CSII (mean ± SD)	2.1 ± 3.0i	2.4 ± 3.5j	1.57 ± 1.6k	1.7 ± 2.7l

• Baseline characteristics (age, time since diagnostic and BMI) were no statistically significant between groups. P values representing the comparison between MDI and CSII to A1c: ^a p < 0.0001, ^b p < 0.0001, ^c p = 0.21, ^d p = 0.02; ^‡ total hypoglycemia (mean/month) (< 70 mg/dL): ^e p = 0.001, e ^f p = 0.44, ^g p = 0.04, ^h p = 0.004 e ^§ severe hypoglycemia (≤ 50 mg/dL): ⁱ p = 0.001, ^j p = 0.008, ^k p = 0.03, ^l p = 0.001.

Table 2 also presents the frequency of hypoglycemic events. Fourteen individuals (17.5%) were excluded due to improperly configured glucometer at baseline and/or inability of the analysis by the software. A reduction of 37% was observed with a significant difference (p = 0.001) for total hypoglycemia and 61% for severe hypoglycemia (p = 0.001). In group with stable A1c, there was an improvement of overall hypoglycemia (42%, p = 0.04) and severe (79%, p = 0.03), and in the group that increase A1c, there was a robust reduction of total hypoglycemic (66%, p = 0.004) and severe (74%, p = 0.001).

Regarding the analysis of groups according to A1c above or below 8.0% before CSII. Thirty-nine (49%) patients had baseline A1c greater than or equal to 8.0% (group A) and showed a significant reduction of A1c (1.4%) after three months of use of CSII, decreased from 9.0% to 7.6% (p = 0.0001). The forty-one patients (51%) who had baseline A1c lower of 8.0% (group B) showed a decrease in A1c after three months of CSII, from 0.16% with an average reduction from 7.1% to 7.0% with no statistical significance (p = 0.24).

As shown in table 3, regarding to hypoglycemic events in MDI group, there was significant reduction for severe hypoglycemia (62% – p = 0.05). In CSII group, the total reduction of hypoglycemia was higher (47% – p = 0.001) as well as severe hypoglycemia (60% – p = 0.001).

Table 3
Hypoglycemic episodes per month during multiple daily injections (MDI) regimen and continuous subcutaneous insulin infusion (CSII)

Events	MDI group	CSII group	p
Hypoglycemia (< 70 mg/dL)
A1c initial < 8.0%	23 ± 17.8	12.1 ± 8.5	0.001
A1c initial ≥ 8.0%	14.7 ± 1	11.6 ± 7.5	0.20
Severe hypoglycemia (≤ 50 mg/dL)
A1c initial < 8.0%	5.2 ± 5.4	2.1 ± 3.4	0.001
A1c initial ≥ 8.0%	5.5 ± 11.2	2.1 ± 2.7	0.05

• Data presented as mean ± SD.

DISCUSSION

As it can be seen in the present results, starting the CSII use and keeping it for three months had large beneficial effects in relation to previous use of MDI. The most important benefit were the significant mean reduction in A1c of 0.8% (p < 0.0001). That probably occurs because A1c decreased or remained stable in 82.4% of patients and increased only in 17.6% of them. The decrease in A1c was more significant in patients with reduced control prior, in other words, patients with A1c equal to or greater than 8.0%. In addition, total events and serious hypoglycemic events decreased significantly with the use of CSII with respect to the time of MDI.

These CSII results are consistent with those observed in meta-analysis (¹⁰,¹¹) and prior comparing studies with multiple daily injections (¹²,¹³). However, in a literature review, it was found that A1c and average glucose levels are slightly lower or similar between CSII and MDI (¹⁴).

A meta-analysis that included 52 studies involving 1,547 patients showed improvements in glycemic control with reduced A1c and blood glucose levels with the CSII, compared with the traditional conventional insulin therapy or MDI (¹⁰). In another meta-analysis of RCTs regarding DM1 (¹¹), 301 patients were selected for use CSII and 299 for insulin injections. The difference in A1c was 0.51%, and the mean glucose was more favorable for diabetics with CSII. Although the difference was small, the authors concluded that this could help to reduce the risk of vascular complications (¹¹).

In the present study, we compared the assessment of A1c between previous use of MDI and CSII. A previous case-control study showed that the average A1c was lower with CSII use as described herein and that the sustained improvement after one year of treatment was more difficult to be achieved with the MDI (¹²). The results of the present study were similar to result of another previous study (¹³). There was a decrease of -0.51% in A1c for the total cohort comparing to the previous use of MDI, but this result was more evident in prepuberal (-0.48%) and young adults (-0.76%) than in adolescents (-0.26%) (¹³).

We observe that the response of A1c is more pronounced in those with CSII than in those diabetics patients with poor prior control of their disease. That is, most DM patients with A1c of 8.0% had a significant reduction (p = 0.0001), but those with lower A1c had not had a significant effect (p = 0.24) on A1c. This is in agreement with other studies that showed better control of A1c in diabetic patients with a history of poor glycemic control (¹³,¹⁵).

The effectiveness of intensive treatment, which includes the CSII, seems to decrease with the lowest frequency of SMBG and dose adjustments (¹⁶). In this sense, in a multicenter, randomized, controlled crossover, it was found that the continuous monitoring of glucose was associated with a decrease of A1c in DM1 that are using CSII. This is probably due to the adjustment of insulin therapy (¹⁷). Diabetic patients in this study underwent an average of 2.0 ± 5.37 times/day. This was similar to some authors (¹⁶) but higher than others that only used the measure of 13 times per week (¹⁸).

Hypoglycemia is a cause of stress and anxiety which can affect wellbeing and worsen the quality of life of patients with DM1: 35-40% who have a regular episode of severe hypoglycemia requiring others’ assistance (¹). Hypoglycemia limits the effectiveness of intensive insulin therapy (¹⁹). The results of this study showed an average reduction of 37% of total hypoglycemia and 61% in severe hypoglycemic events. This reduction was more evident in group 2 (79%) that had A1c stable and group 3 (74%) who had worsening of A1c. These results can be considered excellent since the American Diabetes Association considered satisfactory reduction of 10 to 20% of severe hypoglycemia (²⁰).

Hypoglycemia is less common with CSII compared to MDI (¹⁰,¹⁴). The reduction of hypoglycemic events was significantly (p = 0.01) in nearly 50% in the patients using the CSII compared to MDI (¹²). It was reported that the frequency of severe hypoglycemic events decreased with CSII compared to MDI from 138 to 22 events per 100 patient-years during the first year and remained significantly lower during the four-year follow-up (¹⁵).

However, other studies showed no difference between the frequencies of hypoglycemic episodes. In a meta-analysis evaluating the frequency of hypoglycemia between CSII and MDI authors found no significant difference in severe or night hypoglycemia, in adolescents and adults, but in children there was a higher frequency of hypoglycemia (¹⁹). Glycemia below the amount considered hypoglycemic collected by control glucometers and symptomatic hypoglycemia were not different between the two methods (²¹). However, five patients who had frequent episodic hypoglycemic improved with CSII (²¹).

In studies with DM2, the use of CSII was associated with better metabolic control, and the rate of hypoglycemia was similar to the use of three daily injections of lispro and NPH (²²). The improvement in A1c was also observed with greater intensity in type 2 diabetics with poor control and persisted during the six years of use CSII (²³). However, other studies have shown that the use of MDI over the CSII no significant difference A1c and episodes of hypoglycemia in type 2 diabetes (¹⁸,²⁴).

The normoglycemia is associated with reduced risk of macrovascular and microvascular complications in DM1 (²⁵). However, despite the considerable efforts of patients and health professionals, only a minority of patients can achieve A1c concentrations within the target range (²,³,⁴). The use of the CSII therapy reduces A1c without an increase in hypoglycemic events compared with the MDI (²⁶), and is recommended for the improved metabolic control (²⁷).

The vast majority of diabetic patients treated at the CSII clinic of Endo/HRT received equipment and inputs via simple internal application directly on the HSSDF without the need for legal action. This latter is usually accompanied without adequate specialized assessments (²⁸,²⁹). This fact fills one with the official guidelines recommended by SBD, for the profile of the ideal candidate for therapy (³⁰). In principle, it is considered a good candidate for therapy with that motivation to achieve tight glycemic control and financial resources available for the use of this technology or access to government programs that provide coverage for this feature. Other requirements would be motivation to learn the general principles of self-control of diabetes, ability to perform carbohydrate counting and proportional adjustments of insulin doses, and willingness and ability to operate correctly the equipment and adhere to strict recommendations on its use (³⁰).

It appears that the HSSDF filed the assessment, benefited the local population, and optimized the use of resources allocated for this purpose. The results of this study obtained at the CSII outpatient reference clinic of HSSDF, highlighted by the robust reduction of A1c concentrations and the number of severe hypoglycemia cases assure these facts. These parameters are critical and of great relevance to consolidate the current protocol based on national and international guidelines. They also confirm the success of the pioneering activity of first CSII outpatient clinic in the country which, by means of a proper protocol and selection, has proved the access to therapy with CSII in the Brazilian UHS be possible to achieve with positive results and benefits to the population.

Acknowledgements

We would like to thank all participating patients and health care team at the Taguatinga Regional Hospital for their ongoing commitment to quality care for our patients.

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• Financial source: none.

Publication Dates

• Publication in this collection
  Feb 2015

History

• Received
  1 Oct 2013
• Accepted
  24 Nov 2014