Most children and young people (CYP) with type 1 diabetes present with the classic symptoms of polyuria, polydipsia, lethargy and weight loss. However, healthcare professionals do not always consider diabetes in the context of childhood, and many parents may suspect diabetes but delay seeking medical help because they do not want to believe this could happen to their child (Lowes et al, 2005). This is problematic, particularly considering the subsequent outcome of diabetic ketoacidosis, and potential death, if diabetes is untreated.
There are particular difficulties in diagnosing young children, particularly those under 2 years of age. Parents may have concerns that the child is fretful, restless or irritable, but questioning will reveal a story of increased or constant milk feeding and heavy, soaking nappies. Older children may present with secondary nocturnal enuresis. Ketoacidosis will cause Kussmaul breathing, leading to a diagnosis of chest infection, or abdominal pain that may be mistaken for an acute surgical emergency. Urine testing for glucose and ketones is easy in most children (if they have diabetes, they will be polyuric). If the urine test is positive and/or a random capillary blood glucose is >11.1 mmol/L, urgent discussion with the local paediatrician should take place (Alberti et al, 2004).
A number of other forms of diabetes are increasingly being diagnosed. Table 1 highlights the differential diagnosis of glucose intolerance in childhood and the likely clinical presentation (Porter and Barrett, 2004). Secondary diabetes related to cystic fibrosis or high-dose steroid replacement is well recognised. Genetic forms of diabetes such as maturity-onset diabetes of the young (MODY) can present in childhood: correct diagnosis is important as management may be affected. A useful resource is the website www.diabetesgenes.org (accessed 22.01.14), which contains information on genetic forms of diabetes and a MODY risk calculator.
Of great concern is the increasing incidence of type 2 diabetes in childhood, especially in areas with high proportions of ethnic minorities. However, the numbers are still relatively small, and the UK does not seem to have the high prevalence seen in North America or Japan (D’Adamo and Caprio, 2011). The clinical presentation of CYP with type 2 diabetes can be similar to that of CYP with type 1 diabetes, and cases with ketosis have been described, although this is often mild (Fagot-Campagna et al, 2000; see also Table 1).
The majority of children with type 2 diabetes in the UK are from south Asian backgrounds and have a strong family history of type 2 diabetes (Haines et al, 2007). Making a confident diagnosis of type 2 over type 1 diabetes can be a challenge, even for an experienced paediatrician. The most pragmatic approach in case of any doubt is to give insulin therapy (Rosenbloom et al, 2011). This is likely to be necessary where blood glucose levels are in double figures or significant ketonaemia is present, even in an individual with type 2 diabetes. Once the child is safely on treatment and stabilised, the precise diagnosis can then be reviewed regularly in the relative safety of the diabetes clinic. A good overview on management of type 2 diabetes in childhood is provided in the Global IDF/ISPAD Guideline for Diabetes in Childhood and Adolescence (Rosenbloom et al, 2011).
Cases of delayed or missed diagnosis of diabetes are regularly observed (Ali et al, 2011). About 30% of children with new-onset diabetes have had at least one related medical visit before being diagnosed (Bui et al, 2010). At best, children can still be relatively well at presentation; at worst, they can die before they reach hospital. Where there is any concern about the possibility of diabetes in a child or young person, it is essential to discuss the individual with a senior paediatrician as soon as possible.
Nutrition and weight management for overweight children with diabetes
Most children with type 1 diabetes do not have a significant weight problem. However, the inability to deliver insulin in a physiological manner means that most will be over-insulinised (Holl et al, 1998; 2003), except perhaps those on insulin pump therapy, and thus will be heavier than their counterparts without diabetes.
There have been a number of changes to the nutritional management of people with type 1 diabetes over the years. The emphasis is on healthy eating. A healthy diet, as recommended by the International Society for Pediatric and Adolescent Diabetes (Smart et al, 2011), is composed of: 50–55% carbohydrate, of which sucrose can be up to 10% of total daily energy intake; 30–35% fat, with <10% coming from saturated or trans-fatty acid sources; and 10–15% protein. Salt intake should be <6 g per day.
These dietary recommendations apply across the paediatric age range, but a flexible approach will be necessary for younger children, particularly toddlers. Frequent small meals, or “grazing”, are typical of young children, and it will be easier to adapt the insulin regimen to fit the child rather than ask the parents to make drastic changes to the diet of their young children, who already provide a number of challenges.
Studies have examined the diet of different age groups of CYP (Smart et al, 2011). There are methodological problems with examining dietary patterns in a group of people who have been given a lot of information on how to eat. Food diaries, often used as a gold standard for assessment, are also an effective deterrent to “normal” eating. However, clinical experience does suggest that people with diabetes are no different from the general population in terms of what may be called dietary “indiscretions”. Ideally these would be infrequent, and although blood glucose levels can be controlled by carbohydrate counting and adjusting insulin dosage, the extra calories can lead to significant weight gain, which can be difficult to lose.
It is likely that most people with type 2 diabetes will be either overweight or obese; however, it is beyond the scope of this article to describe in detail the approaches to weight management for childhood obesity. A number of studies have been performed in CYP, varying from lifestyle adjustments to weight loss medication such as orlistat and sibutramine, and have been the subject of a Cochrane review (Oude Luttikhuis et al, 2009). NICE (2006) guidance is also available. Sibutramine is no longer available in the UK and orlistat is an over-the-counter preparation but has an indication only in adults. The majority of these studies had small sample sizes, and were of short duration, with many showing little effect on weight change (Oude Luttikhuis et al, 2009).
There do not appear to have been any studies that have specifically assessed weight management strategies in CYP with type 2 diabetes, but there is no reason to suspect that generic weight management approaches would not be appropriate. Children and their families will need to be motivated and engaged for any weight loss strategy to be effective. Data suggest that this can be very difficult. Studies also show that families struggle to recognise that their child may have a significant weight problem (Etelson et al, 2003; Eckstein et al, 2006). This may be because many parents compare their child’s physique with that of other children in the playground; however, with 20% of children entering primary school overweight or obese in the UK, such playground comparisons may provide false reassurance to parents (Etelson et al, 2003; Eckstein et al, 2006).
Worryingly, it has been shown that even adolescents with type 2 diabetes and their parents underestimate the severity of the weight problem (Skinner et al, 2008). In one study, the mean BMI of 104 adolescents with diabetes was 36.4 kg/m2; 87% were classed as overweight by North American guidelines (Barlow and Dietz, 1998). Yet 40% of parents whose child had a BMI >95th percentile felt that their child’s weight was “about right”, and 55% of adolescents with a BMI >95th percentile were unconcerned by their weight.
There was consistency in weight estimation between adolescents and their parents. Parents and adolescents who underestimated their weight problems had poorer dietary and physical activity behaviours than those who were more aware of the weight issues (Skinner et al, 2008). Adequate explanation of the importance of weight management for people with type 2 diabetes is therefore paramount.
Management of children with type 1 diabetes
Management of CYP with diabetes will depend on a number of factors, including age, weight, developmental stage, cognitive ability and family support.
Insulin requirement
As in most areas of paediatrics, doses of medication, in this case insulin, are initially based on body weight. Doses prescribed at diagnosis are informed “estimates” of likely need. Most centres are likely to start doses at the lower end of the estimated range to avoid provoking hypoglycaemia soon after diagnosis. Most CYP will be quite insulin resistant for the first few weeks (approximately 4–8 weeks) after diagnosis, owing to the preceding persistent hyperglycaemia causing glucose toxicity just before diagnosis, and doses may need to be increased quite rapidly in the early stages. It is suggested that the total daily insulin requirement will vary from 0.7 to 1.0 unit/kg/day for prepubertal children (Bangstad et al, 2011).
For young people going through puberty, insulin requirement may be as high as 1.5–2.0 units/kg/day during the rapid growth phase – usually mid-to-late puberty (Bangstad et al, 2011). The increase in insulin requirement during the pubertal growth spurt is thought to be due to increases in growth hormone released during puberty resulting in insulin resistance (Dunger, 1992).
In addition, the insulin deficiency of type 1 diabetes leads to abnormalities in the growth hormone/insulin-like growth factor-1 (IGF-1) feedback mechanism and pubertal children over-secrete growth hormone, making puberty a time of marked insulin resistance for children with the condition (Dunger, 1992).
Total daily doses of insulin are likely to be very high during puberty as young people also significantly increase their calorie intake to fuel normal growth (a 60 kg boy could need up to 120 units/day), causing anxiety for these individuals and their carers. Despite these large doses of insulin, even adolescents who are very engaged with their diabetes management can struggle to achieve tight glycaemic control.
The 20th anniversary of the DCCT (Diabetes Control and Complications Trial) is approaching, but the findings are still relevant and highlight the difficulties for adolescents. A total of 195 adolescents aged between 13 and 17 years participated in the trial (DCCT Research Group, 1994). Although the beneficial effect of improved glycaemic control was still evident, adolescents found it more difficult to achieve lower HbA1c levels than their adult counterparts (64 ± 1.4 mmol/mol [8.06 ± 0.13%] versus 54 ± 0.03 mmol/mol [7.12 ± 0.03%], respectively; P<0.001), yet they had a greater tendency to develop severe hypoglycaemia (85.7 events per 100 person-years versus 56.9 events per 100 person-years in the adult cohort; DCCT Research Group, 1994).
Insulin injections
Young children with diabetes are likely to need shorter needles than adolescents and adults. However, this will need to be assessed for each individual – some teenagers can be very slim and the author has often used short (4 mm) needles in this group at diagnosis where there has been significant weight loss. All children are advised to rotate injection sites both throughout the day and from day to day to avoid the development of lipohypertrophy, although in my clinical experience there are a small number of people who appear to be particularly prone to this complication, even with good site rotation.
Insulin regimen
Few studies have examined the optimum diabetes regimen for children at different ages in a structured experimental fashion (Spinks et al, 2007). As a result, the choice of regimen and insulin type is likely to be a negotiation between child, family and their healthcare team (Bangstad et al, 2011).
Many clinical teams are recommending intensive insulin regimens, either multiple daily injections (MDI) or insulin pump therapy, for all CYP with diabetes (Gosden et al, 2010). This will involve carbohydrate counting and dose adjustment of mealtime rapid-acting insulin. These are likely to be the best regimens for very young children (under 5 years), who may eat unpredictably with respect to both timing and quantity of food. Rapid-acting insulin can be given after food for these children, so the dose can be tailored to the amount of food actually eaten rather than the amount of food offered.
MDI are a good way of managing food refusal in any age of child without having to worry about the risk of hypoglycaemia. This is also a very good regimen for adolescents, who will have much less structure to their lives and will want to go out and socialise with friends at varying times. However, these regimens do involve a high treatment burden and require a great deal of individual and family engagement to work well – during adolescence it can be very difficult to achieve this degree of adherence to treatment. Many outpatient consultations with adolescents will involve negotiations about how to fit diabetes around the life of someone who would prefer to believe it was not there.
Some families will struggle with these regimens. Carbohydrate counting and insulin dose adjustment based on ambient glucose, food and physical activity are likely to require a reasonable level of understanding, and can be extremely challenging for families with special educational needs (either in the child or supporting family) or problems with literacy or numeracy. Support is available, often from the specialist nurse within the local diabetes team, but some families are still left with little confidence. In the end, people with diabetes have to make decisions about their diabetes management almost continuously, and no diabetes care team can provide this level of input.
Data suggest that families will benefit from much more intensive support, but this can prove difficult where diabetes teams are stretched already; alternative means of support do need to be developed (Brink et al, 2002). In the meantime, a conventional insulin regimen of twice-daily mixed insulin or an MDI regimen with long-acting background insulin and predetermined, fixed doses of rapid-acting insulin with meals, rather than carbohydrate-counted adjusted doses, may be a suitable compromise for these families.
Insulin pump therapy
Insulin pump therapy has been approved by NICE for use in childhood (NICE, 2008). The NICE guideline states that a child under 12 years of age will qualify for insulin pump therapy if an MDI regimen is considered impractical or inappropriate, which could include all children under 12 years of age. Children over the age of 12 would need to fulfil adult criteria (NICE, 2008). In areas where insulin pump provision has been unproblematic, some services are starting children on insulin pumps at diagnosis, but there are many centres where this is not possible for a number of reasons.
Data suggest that there is some benefit to be gained from insulin pump therapy in childhood, mainly with respect to avoidance of hypoglycaemia (Pickup and Sutton, 2008). Also, emerging data suggest that a combination of an insulin pump and continuous glucose monitoring (CGM; worn continuously) can improve glycaemic control. The STAR 3 (Sensor-Augmented Pump Therapy for A1c Reduction) study examined the use of sensor-augmented insulin pump therapy. The results suggest that this can lead to improvements in HbA1c levels in both children and adults, without an increased risk of hypoglycaemia (Bergenstal et al, 2010). CGM may be particularly useful in hypoglycaemia avoidance. A study of people with good glycaemic control (HbA1c level <53 mmol/mol [<7.0%]) showed that control could be improved even in these individuals and without hypoglycaemia (Juvenile Diabetes Research Foundation [JDRF] CGM Study Group, 2009).
In contrast, a study examining continuous rather than focused use of glucose sensors showed a benefit in adults over 25 years of age, but not in CYP. This may have been related to a lower rate of continuous use of the glucose sensor in younger people: CGM use for 6 days or more per week was 83% in those over 25 years of age, 30% in those aged 15–24 years and 50% in those aged 8–14 years (JDRF CGM Study Group et al, 2008).
Some studies have examined the benefits of self-monitoring of blood glucose (SMBG). Findings suggest that four or more blood glucose tests per day is associated with a 13 mmol/mol (1.2%) reduction in HbA1c (Levine et al, 2001). In these studies it is difficult to ascertain whether it is the people who are most engaged with their diabetes who benefit the most from frequent blood glucose monitoring: doing six blood tests a day just to document them in a glucose diary is likely to be of limited therapeutic value. However, CYP taking MDI regimens will be asked to perform four blood tests per day, whereas CYP using pump therapy will be asked to perform a minimum of four to six tests per day.
Hypoglycaemia
Recurrent hypoglycaemia can be a significant barrier to achieving tight glycaemic control in adults and children with type 1 diabetes. Fear of hypoglycaemia is well described and clinical experience suggests that some CYP keep blood glucose levels high to avoid episodes of hypoglycaemia. Yet no strong link between fear of hypoglycaemia and sub-optimal diabetes control has been demonstrated (Gonder-Frederick et al, 2011).
Of importance are recent changes to the regulations concerning diabetes, driving and hypoglycaemia. These will be relevant to young people with diabetes, many of whom will ask their GP to provide a “medical” reference. The regulations now state that people on insulin must have awareness of hypoglycaemia and must not have had an episode of severe hypoglycaemia in the last 12 months (Driver and Vehicle Licensing Agency, 2013). While few data have been published in this area, impaired awareness of hypoglycaemia has been described in up to 29% of CYP with diabetes (Ly et al, 2009). Detailed discussions about the regulations for driving with diabetes need to be had with young people who are planning to learn to drive.
Management of diabetes at school
The management of any child with a chronic condition in school can be challenging; dealing with blood tests and injections can prove even more so. With an increasing emphasis on intensive insulin regimens, schools are being asked to do more for children with diabetes, especially primary school children who are unable to do their own injections or, at the very least, need some adult supervision.
Although schools have a duty of care towards children with all sorts of medical needs, there is no legislation in the UK – or in many other countries globally – that specifies the supportive role of school staff (Diabetes UK, 2008). Studies of parents and children have shown that negative experiences are not uncommon in school. A number of children use the school toilets to do injections and blood glucose testing, and there are concerns that school staff lack even a basic understanding of diabetes; consequently children rely on peers and not teaching staff for help (Newbould et al, 2007; Amillategui et al, 2009).
Data from Spain suggest that 44% of parents have had to rearrange their work schedules to support their children at school (Amillategui et al, 2007) and UK data show that if children were unable to administer their own insulin, 70% of schools expected a parent to come and give the injection (Diabetes UK, 2009). However, the difficulties for schools and teaching staff should not be underestimated, and expectations of a high level of knowledge and understanding of diverse medical conditions, from epilepsy through congenital heart disease to diabetes, are significant.
Adolescence
Adolescence is the period of transition from childhood to adulthood. It is a time of great change in biological, social and psychological terms. The impact of puberty on diabetes and the associated increased insulin requirement has already been discussed. If SMBG is performed regularly yet readings are often high because of the insulin resistance of puberty, this will be demoralising for adolescents. If high doses of insulin are given to overcome insulin resistance, frequent hypoglycaemia may ensue, which can be very embarrassing for adolescents, or could lead to unacceptable weight gain (especially in girls). It is not surprising that adolescents find it hard to keep up with the management of their diabetes.
In addition, having a chronic condition such as diabetes at a time when fitting in with peers is of paramount importance is potentially very challenging. It is known that diabetes control deteriorates during this time: insulin doses may be omitted and clinic attendance can be erratic. A number of different approaches have been tried in an attempt to improve adolescent engagement with diabetes management, but there is no easy answer. Family support is crucial at this time and comprises “behaviours that foster, in an individual, feelings of comfort and belonging, and that he or she is basically accepted and approved of as a person by the parents and family” (Skinner et al, 2005).
Research shows a bell-shaped response to family support, with both those getting too little and those getting too much tending to do less well in terms of diabetes management (Gustafsson et al, 1987). Recurrent diabetic ketoacidosis is a significant risk, especially in girls, and those from lower socioeconomic backgrounds or with pre-existing psychosocial issues (Chapman et al, 1988).
Risk taking is part of what may be considered normal adolescent behaviour – testing out the boundaries as a phase of personal development. These risks will have a variable impact on health, but are likely to have a greater impact in those with an underlying chronic condition and may also be more prevalent in these younger people. In the UK, data suggest that 11% of 13- to 14-year-olds have smoked cigarettes, with 4% smoking every day, 17% have been drunk at least once and 11% have tried some type of recreational drug (Office for Standards in Education, Children’s Services and Skills, 2008).
A large study from a multicentre collaboration across Germany and Austria showed that the prevalence of smoking in CYP with diabetes increased from 0.1% in children under 11 years of age to 28.4% in those aged 15–20 years (Hofer et al, 2009). Smokers had poorer glycaemic control (HbA1c, 76 mmol/mol [9.1%] in smokers versus 64 mmol/mol [8.0%] in non-smokers; P<0.0001) and there were also negative effects on diastolic blood pressure and lipid profile. However, this may reflect a group of individuals struggling to engage with their diabetes management in general. The long-term risks of micro- and macrovascular disease in people with type 1 diabetes are well described, and so all adolescents should be informed of the dangers and offered smoking cessation support as and when available.
The UK has the highest rate of teenage pregnancies in Europe: five times the rate in the Netherlands and twice that in France (United Nations Statistics Division, 2010). Teenage pregnancies are associated with poorer health outcomes for both mother and child (Chen et al, 2007), but this may in part reflect the poorer socioeconomic status of the young women who become pregnant during adolescence. There do not appear to be any studies examining pregnancy rates and outcomes in adolescents with diabetes, although pregnancies do occur.
UK data from studies of adult women with diabetes are quite sobering. A study conducted by the Confidential Enquiry into Maternal and Child Health (CEMACH, 2007) found that only 41% of pregnancies were planned, 28% of women smoked (compared with 35% of the general maternity population) and only 27% took folic acid before pregnancy. The preterm delivery rate was 36%, with a caesarean section rate of 67%, compared with 7% and 22%, respectively, in the general population. Women with diabetes also had a five-fold increased risk of stillbirth, a three-fold increased risk of perinatal mortality and a two-fold increased risk of fetal congenital anomaly.
Information and support for young girls and women with diabetes is vital to prevent unplanned pregnancies. Yet the correct methods and timing of providing such information to young girls remain unclear, both for girls with diabetes and those in the general population (CEMACH, 2007). Adolescent girls will have a lot of exposure to healthcare – time that could be used for education with the cooperation and encouragement of parents or carers, especially about detrimental lifestyle behaviours and the need to take folic acid 5mg/day if pregnancy is anticipated.
Transition of care from paediatric to adult services is a recognised challenge for all groups of young people with chronic medical conditions (American Academy of Pediatrics et al, 2011). “Transition is the purposeful, planned movement of adolescents and young adults with chronic physical and medical conditions from child-centred to adult-oriented health care systems” (Blum et al, 1993). The National Service Framework (NSF) for Children and Young People (DH, 2004) recommends that transition be seen as a guided, educational, therapeutic process, rather than merely an administrative event. Although the majority of models of transitional care consider joint working between adult and paediatric secondary care, many of these young people do not come to clinic at all. It is likely that the role of the primary care team could become paramount for these young people, and more work is needed in this area.
Diabetes review
In 2012–13, a mandatory Best Practice Tariff was introduced to provide an annual payment for the treatment of every child and young person under 19 years of age with diabetes (Randell, 2012). This is in recognition of the increasingly complex nature of paediatric diabetes care, involving a multidisciplinary team of specialised personnel. Funding will be given provided that a number of criteria are met. These include 3-monthly outpatient reviews, structured education, 24-hour access to specialist diabetes advice and annual screening for complications as recommended by NICE (2004). Service commissioners will monitor compliance with the tariff criteria, which are likely to undergo further review in the near future. Readers should note that this is a hospital tariff rather than a GP one.
Also relevant are the GP requirements under the Quality and Outcomes Framework (QOF):
- DM001 – the contractor establishes and maintains a register of all patients aged 17 or over with diabetes mellitus.
- DM010 – the percentage of patients with diabetes, on the register, who have had influenza immunisation.
NICE (2004) guidance recommends that all children over 12 years of age have an “annual review” with screening for microvascular complications. Young people need to have their blood pressure checked, retinal screening, urine screening for microalbuminuria and a blood test for assessment of renal function. Children under 12 years of age will have annual blood tests to screen for autoimmune thyroiditis, which occurs in up to 10% of those with type 1 diabetes. Coeliac disease is also more prevalent in this patient group. It is recommended that this is tested for at diagnosis of diabetes, and future testing reconsidered if symptoms of coeliac disease develop (NICE, 2004).
Conclusion
Childhood diabetes is a complex medical condition that requires healthcare professionals to have a large number of clinical, educational and psychological skills for successful management. There is no doubt that joint working with children and their families is as rewarding as it can be challenging. This is an area where joint working with primary care is still underdeveloped but could lead to improved outcomes for children and their families.
Scotland-wide advice to inform the process of making injectable weight management drugs available and to prevent variation between Health Boards.
14 Nov 2024