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Blood Glucose Monitoring: Use of Automated Bolus Calculators for Diabetes Management

Published Online: August 28th 2013 European Endocrinology, 2013;9(2):92–5 DOI: http://doi.org/10.17925/EE.2013.09.02.92
Authors: Frank L Schwart, Cynthia R Marling
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Fewer than 30 % of patients with diabetes who are on insulin therapy achieve target glycated haemoglobin (HbA1C) levels. Automated bolus calculators (ABCs) are now almost universally used for patients on insulin pump therapy to calculate pre-meal insulin doses. Use of ABCs in glucose monitors and smart phone applications have the potential to improve glucose control in a larger population of individuals with diabetes on insulin therapy by overcoming the fear of hypoglycaemia and assisting those with low numeracy skills.

Acknowledgements:  The authors gratefully acknowledge the following sources of funding: National Science Foundation, Medtronic, Ohio University Russ College Biomedical Engineering Fund, JO Watson, DO Endowed Diabetes Research Chair of the Osteopathic Heritage Foundation, Ohio University Heritage College of Osteopathic Medicine Research and Scholarly Affairs Committee, and the Ohio University Diabetes Research Initiative.


Automated bolus calculators, glucose algorithms, blood glucose measurement, continuous glucose monitoring, glycaemic control


Automated Bolus Calculators

Automated Bolus Calculators
Insulin dosing algorithms have been used for years by healthcare providers to improve glucose control in patients with diabetes. With the development of insulin pumps and their increased use in the early 1980s, and with the publication of the results from the Diabetes Control and Complications Trial (DCCT) in the early 1990s demonstrating the benefits of intensive glucose control in preventing the long-term complications of diabetes, both the capacity and need to achieve intensive glucose control occurred.1–4 The first technology to assist patients in calculating meal insulin boluses, which was developed to improve post-prandial glucose control, was in a personal digital assistant (PDA), reported by Gross et al.5 in 2003. This became the prototype for the meal ‘bolus wizard’ developed by Medtronic MiniMed (Northridge, CA) for use in their insulin pumps. Currently, all commercially available insulin pumps have some form of automated bolus calculator (ABC) algorithm software built into them, although the parameters for each ABC vary.6 Over the last few years, glucose meters have begun incorporating ABCs (e.g. ACCU-CHEK® Aviva Expert® and FreeStyle InsuLinx® Blood Glucose Monitoring System) to assist with pre-meal insulin dosing for patients using basal/bolus insulin regimens other than pumps (insulin syringes, pens or spring-loaded insulin delivery devices such as the V-Go®). With the increasing use of smart phone technology to support diabetes self-management it is only a matter of time before applications with ABCs are incorporated into them.7 This paper reviews the current use of ABCs to calculate insulin dosages and discusses the potential future software innovations which could hopefully help healthcare providers and their patients more safely achieve intensive glucose control and improve disease outcomes.

Barriers to Intensive Glucose Control
There are multiple barriers facing patients with diabetes and their healthcare providers as they attempt to achieve optimal glucose control. First, hypoglycaemia and/or fear of hypoglycaemia are the major limiting factors to intensive glucose control8,9 for patients, their families and healthcare providers. In reality, less than 50 % of patients with diabetes achieve target glucose or glycated haemoglobin (HbA1C) levels and less than 30 % of patients who take diabetes medications reach recommended target levels.10 From a patient’s perspective, additional barriers range from the cost of medications, durable medical products and medical care, to the complexity and time requirements of intensive self-management, social time demands, and, in some cases, the lack of family support or personal motivation.11,12 From a provider’s perspective, the time requirements (and lack of reimbursement) to analyse voluminous glucose records (data overload) and make frequent insulin or medication adjustments during and also between office visits are significant barriers to intensive management.13,14 This has been called the clinical inertia of diabetes care.15

Basics of Meal Bolus Calculators
Insulin meal bolus calculators have been shown to improve post-prandial glucose control, reduce dosing errors, allay fears of hypoglycaemia and improve confidence in self-management in individuals with diabetes of all ages that use them.16–20 Meal bolus insulin dose calculations are based on [1] the target blood glucose level, [2] the current glucose level, [3] the carbohydrate-to-insulin ratio (CIR), [4] total grammes of carbohydrate (CHO) to be consumed in the meal, and [5] an insulin sensitivity factor (ISF) (see Table 1). Each of these factors is different for each patient and each must be determined and individualised by the provider for each patient based on frequent glucose testing and insulin adjustments over time. Built into most ABC algorithms is also an insulin correction algorithm designed to adjust the bolus dose additionally for pre-meal glucose levels which are out of the patient’s target range (either high or low glucose levels). The correction algorithm automatically adds or subtracts insulin from the meal bolus calculation based on the pre-meal glucose level when it is out of target range. This same insulin correction algorithm can also be used to correct glucose levels anytime they are above a given target range. ABCs used by insulin pumps also factor in the “active insulin on board” (IOB) which includes the basal insulin continuously being infused as well as the insulin remaining from previous insulin boluses. These IOB insulin correction adjustments are based on mathematical modeling of insulin kinetics for insulin that is injected subcutaneously.21–23 The IOB estimations are to prevent the “stacking” of multiple insulin boluses which can result in hypoglycaemia.24 Finally, the shape of a bolus infusion can be varied to adjust for the composition of the food (glycaemic index) or the duration of a particular meal (e.g. 3 courses versus 7).25 The most common bolus forms are the standard single wave, an extended dual wave and an extended square wave bolus26,27 and are exhibited in Figure 1. Using advanced computer algorithms, the bolus may also be reduced by a temporal amount to prevent hypoglycaemia.26,28 A recent meta-analysis review of 6 papers including 354 patients revealed less frequent hypoglycaemia, better post prandial glucose controls, good patient acceptance and satisfaction but no real improvement in HbA1C levels.18 The use of ABCs is now widely accepted by patients and has been shown to contribute to improved glucose control18,29 and reduced glycaemic variability.19,30,31

Implications of Expanded Use of ABCs in Glucose Meters (and Smart Phones) to the General Diabetes Population The incorporation of ABCs into standard glucose meters (e.g. ACCUCHEK Aviva Expert and FreeStyle InsuLinx Blood Glucose Monitoring System) has been intended to assist patients not on insulin pumps but who are using basal/bolus insulin regimens with pre-meal insulin dosing. Early studies on the effectiveness and patient acceptance of their use have been very favourably reported31,32 and reviewed.13,33 Expanding the use of meters (and smart phone applications) with embedded ABCs to the general diabetes population will increase access to these automated dosing algorithms and should help overcome two major barriers to intensive glucose control in this large population of patients: low numeracy skills; and the time requirements for intensive self-management.7 Low numeracy skills are common in patients with diabetes34 and often result in difficulty reading and understanding nutrition labels,35 counting calories and carbohydrates and calculating insulin bolus doses,35 contributing to poor glycaemic control.34,36 The meter-embedded ABCs can help to mitigate this problem, especially if coupled with smart phone nutrition applications for reading food labels and counting calories and carbohydrates (as of June 2013 there were at least 84 such applications featured in the Apple iTunes® Store). The meterembedded bolus advisors are also effective at overcoming fear of hypoglycaemia, increasing confidence in meal-time insulin dosing and improving glucose control and they are considered easy to use and are associated with high patient satisfaction.27,28 Potential time savings, while likely, are not as clear cut, as the time required to use the new technology is significant. The use of ABC embedded glucose meters is a positive development and the potential benefit of their general use in large numbers of patients with both type 1 and type 2 diabetes to improve self-management and overcome clinical inertia is exciting. However, their expanded use will require additional individual patient diabetes education about meal calorie and carbohydrate counting so that the information fed into these algorithms is accurate.

Limitations of Current Meal Bolus Insulin Algorithms
The major difficulties with current insulin dosing algorithms are: (1) they require accurate carbohydrate counting for each meal, which is a major source of inaccuracy in the entire system;37,38 (2) they are based primarily on the carbohydrate content of food rather than factoring in the glycaemic index of the carbohydrates or the effects of fat and protein content in a meal; and (3) they require considerable calibration based on empirical observation of each individual patient, which still remains very labour intensive for both the patient and healthcare provider. For example, dietary fat and fatty acids in meals can delay gastric emptying,39,40 increase hepatic glucose production41 and increase peripheral insulin resistance,42 all potentially contributing to higher postprandial glucose levels.43 In addition, there are individual differences in rates of gastric emptying, rates of nutrient absorption, rates of insulin absorption (site, ambient temperature, etc.), as well as differences in tissue sensitivity to the absorbed insulin, which can also vary in the same individual from day to day. The second difficulty lies in having to iteratively refine the values of the carbohydrate-to-insulin ratio and insulin sensitivity factor through trial and error for each patient in order to achieve accurate dosing. We believe that the incorporation of case-based reasoning software into these algorithms will enhance the patient-specificity of ABCs by “remembering” the effects of different meal components on post-prandial glucose excursions.14,44

What About Automated Basal Insulin Algorithms?
Basal insulin algorithms are also commonly used in the management of both type 145,46 and type 2 diabetes.47–49 Basal insulin algorithms are indicated whenever patients are being converted to basal bolus regimens or demonstrate chronic morning hyperglycaemia. The most common approach is to increase the nighttime dose of glargine [rDNA origin] or insulin detemir [rDNA origin] by 2–3 units every 4–5 days if the fasting glucose level is greater than 180 mg/dl until the fasting glucose level is between 120–150 mg/dl, then only increase the basal insulin by 1–2 units every 4–5 days until fasting glucose level is between 100 and 120 mg/dl. At present, there are no meters or smart phone applications with automated basal insulin algorithms for individual patient use.

Future Approaches to Automated Decision Support Software for Diabetes Management
The current status of bolus calculator decision support software was also recently reviewed by David Klonoff.50 We believe that decision support software can potentially be expanded to all phases of diabetes insulin dosage advice, including both bolus and basal insulin adjustments. “Sensor augmented insulin pumps”51,52 using CGM-based algorithms have been shown to improve postprandial glycaemia both in silico and clinically when compared to standard ABCs.53 However, even the most sophisticated permutation of these controllers, the “iBolus,” cannot yet overcome the unpredictability of individual glycaemic responses.53 The continued development of a fully integrated closed-loop artificial pancreas is progressing rapidly with improvements in the computer controller algorithms, remote monitoring and control capacity and size of the devices, which is really exciting as well;54–56 however, post-prandial glucose control is still a major challenge in these systems. This is not surprising, given our experience with case-based reasoning software to develop the 4 Diabetes Support System™ (4DSS), where we have observed that individual patients with type 1 diabetes on insulin pumps typically have unique, but consistent, glycaemic responses to meals of similar composition.14,57 Incorporating “learned or remembered” individual glycaemic responses to previous meals could potentially improve sensor augmented ABC algorithms. We are currently using machine learning techniques (similar to those used to predict the stock market) attempting to predict future glucose levels 30–60 minutes beyond a current CGM value based on the individual’s past CGM data. Figure 2 illustrates how sensor augmented insulin pump controllers capable of predicting future glucose excursions (30–60 minutes in advance) could help modulate an insulin pump bolus algorithm as well as suspend the pump for a predicted hypoglycaemic reaction. In addition to automated meal bolus algorithms (ABCs), devices which automate glucose pattern analysis are also in development.57,58 For example, LifeScan OneTouch Verio IQ® glucose meter alerts patients and/or healthcare providers about abnormal patterns of glucose control (e.g. high or low glucose levels in AM). This is the first commercial device which facilitates self-assessment of abnormal glucose patterns;58 however, there are no automated basal or bolus dosage suggestions on the device. The 4DSS™ is designed to scan large volumes of insulin pump, CGM and life-event data, detect recurrent problems of glycaemic control and indicate potential causes.52 Since it also “remembers” recurrent individual problems for each patient, we are currently trying to automate patient-specific reminders for different life-events (meals, exercise, etc).

Technology is rapidly transforming our capacity to help manage patients with diabetes. ABCs are widely accepted by physicians and their patients who are in intensive treatment programmes with insulin pumps.18,29 Expanded use of this technology to glucose meters and smart phone applications for use in the general diabetes population and all forms of diabetes is possible and could be implemented with enhanced provider and patient education. If we are to overcome the clinical inertia of our current diabetes management, this new technology should be adopted as soon as possible. Within the near-term, our capacity to monitor insulin pump data, CGM output and the life-events data of our patients remotely and essentially “live” via smart phones and the cloud will be a reality. We look forward to additional advances in automated bolus and basal insulin dosage calculators, as well as automated glucose pattern analysis, to further enhance diabetes management and improve patient outcomes and quality of life.

Article Information:

The software and methodology implemented in the 4 Diabetes Support System have been submitted to the US patent office, application number US60/901,703, and rights are co-owned by the Ohio University Technology Transfer Office, Cynthia R Marling and Frank L Schwartz.


Frank L Schwartz, Professor of Endocrinology, JO Watson Chair for Diabetes Research, The Diabetes Institute, Ohio University Heritage College of Osteopathic Medicine, 331 Academic Research Center, Athens, OH 45701, US. E: schwartf@ohio.edu




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