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Feature Articles

Misdiagnosis and Diabetic Ketoacidosis at Diagnosis of Type 1 Diabetes: Patient and Caregiver Perspectives

  1. Cynthia Muñoz1,2,
  2. Anna Floreen3,
  3. Colleen Garey4,
  4. Tom Karlya5,
  5. David Jelley6,
  6. G. Todd Alonso7 and
  7. Alicia McAuliffe-Fogarty4
  1. 1University of Southern California (USC) Keck School of Medicine, Los Angeles, CA
  2. 2USC UCEDD & Endocrinology, Children’s Hospital Los Angeles, Los Angeles, CA
  3. 3College Diabetes Network, Boston, MA
  4. 4T1D Exchange, Boston, MA
  5. 5Diabetes Research Institute Foundation, Hollywood, FL
  6. 6Harold Hamm Diabetes Center, University of Oklahoma School of Community Medicine, Tulsa, OK
  7. 7Barbara Davis Center, University of Colorado, Aurora, CO
  1. Corresponding author: Alicia McAuliffe-Fogarty, amcauliffefogarty{at}t1dexchange.org
Clinical Diabetes 2019 Jul; 37(3): 276-281. https://doi.org/10.2337/cd18-0088
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Abstract

IN BRIEF Diabetic ketoacidosis (DKA) is a life-threatening complication that frequently occurs at diagnosis of type 1 diabetes, occurs more commonly when a patient is misdiagnosed, is the leading cause of death in children with type 1 diabetes, and is associated with worse long-term outcomes. Our retrospective online survey found that 25% of all participants were misdiagnosed and that misdiagnosis was associated with an 18% increased risk for DKA compared to those correctly diagnosed. Adult providers should consider type 1 diabetes when diagnosing type 2 diabetes, and pediatric providers should rule out type 1 diabetes when a patient reports nonspecific viral symptoms.

Type 1 diabetes is an autoimmune disease with an estimated incidence of 21.7/100,000 youths in the United States; a reliable estimate for the incidence of type 1 diabetes in adults is not available. Multiple studies indicate that the incidence of type 1 diabetes continues to rise globally (1–4).

Diabetic ketoacidosis (DKA) is a life-threatening complication of type 1 diabetes that occurs in a significant number of patients at diagnosis (5–9). The large, multisite SEARCH for Diabetes in Youth study has reported that DKA is present in 30% of youth with new-onset type 1 diabetes. Known risk factors for DKA at diagnosis are young age, ethnic minority status, limited or lack of health insurance, lower parent education, lower family income, existing mental disorders, lower BMI, puberty, and preceding infection (8–15). Other risk factors for DKA at diagnosis are the misdiagnosis and delayed treatment of hyperglycemia-related symptoms (16,17).

Misdiagnosis is correlated with increased rates of DKA (13,16). Patients may be misdiagnosed or overlooked at disease onset because the initial symptoms of type 1 diabetes may be nonspecific (2). Many children who are newly diagnosed with type 1 diabetes have seen health care providers (HCPs) within the previous 4 weeks, suggesting that hyperglycemia is initially missed in some patients (2,11,18). Among adults, a misdiagnosis of type 2 diabetes is more common. This presumably occurs secondary to a low index of suspicion, difficulty distinguishing diabetes subtypes based on clinical phenotype, and slower progression to insulin deficiency compared to children (19–24).

DKA at diagnosis is associated with higher initial A1C levels, a lower frequency of partial remission, and less residual β-cell function (5,8,25). Moreover, DKA is the leading cause of death in children and young adults with type 1 diabetes (5,6,10,26). Other consequences of DKA are prolonged recovery, morphologic and functional brain changes associated with adverse neurocognitive outcomes, lengthier hospital stays, and high health care expenses (15,17,27,28).

In the United States, we have been unable to leverage the modifiable risk factors to reduce the incidence of DKA at type 1 diabetes onset (5,12,27). In fact, the rate appears to be increasing (3,29). There are very limited data describing the experience of type 1 diabetes diagnosis from the adult patient and pediatric caregiver perspectives. Furthermore, very little information exists regarding differences in type 1 diabetes diagnosis associated with symptom onset and age. The aim of this study is to report the prevalence of missed diagnosis of type 1 diabetes and DKA as reported by patients and caregivers in the United States.

Design and Methods

Participants

Adults with type 1 diabetes and parents of children with type 1 diabetes were invited to complete an online questionnaire about their diagnosis experiences. Participants were contacted through the T1D Exchange clinic registry and the T1D Exchange online patient community (myGlu.org). T1D Exchange connects researchers, clinicians, funders, and innovators and offers them real-world and clinical data to inform type 1 diabetes product development, clinical care, and innovation. An e-mail invitation was sent to individuals who had previously agreed to be contacted for research purposes. Participants were also recruited through T1D Exchange-Glu social media accounts.

Eligible respondents were >18 years of age and either had type 1 diabetes or were the parent or guardian of a child with type 1 diabetes. Respondents who did not report age or year of diagnosis or who were not diagnosed in the United States were excluded from analysis.

Measures

The survey used in this study was developed by a multidisciplinary research team, including clinicians, researchers, patient advocates, and individuals with type 1 diabetes. Items targeted the type 1 diabetes diagnosis experience and were presented using a multiple-choice format. Regarding diagnosis, respondents were asked, “Were you/w

Was your child misdiagnosed with another condition before being diagnosed with type 1 diabetes?” All study materials were approved by the institutional review board at the Jaeb Center for Health Research in Tampa, Fla. Each participant provided informed consent before completing the survey. Participants completed the survey from their own electronic devices between 20 June 2016 and 9 February 2017.

Analyses

Statistical analyses were completed using R, version 3.4.1 Single Candle software (R Foundation for Statistical Computing, Vienna, Austria) (30). Comparison testing included t tests, analysis of variance (ANOVA), χ2 tests, and risk ratios. Analyses focused on comparing experiences between patients who were diagnosed at <18 years of age and those who were diagnosed as adults.

Results

Demographics

Eighty-three percent of the 3,030 participants who completed the survey met the inclusion criteria. Twenty-two percent identified as a parent or guardian of someone with type 1 diabetes.

Additional demographics can be found in Table 1.

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TABLE 1.

Participant Demographics

Symptoms at Diagnosis

Polydipsia (excessive thirst) (88.1%), polyuria (excessive urination) (82.0%), and fatigue (74.8%) were the most common symptoms at diagnosis for both children and adults with type 1 diabetes. There were notable differences in the prevalence of other symptoms between children and adults (Table 2). Participants diagnosed as adults reported blurred vision, delayed healing of sores, tingling hands and feet, changes in gums, urinary tract infection, and vaginal yeast infection more frequently than respondents diagnosed during childhood. Conversely, participants diagnosed during childhood endorsed polyuria, bedwetting, excessive thirst, stomach pain, nausea or vomiting, and flu-like symptoms more frequently.

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TABLE 2.

Symptoms Present at Diagnosis

Misdiagnosis

Twenty-four percent of participants reported being misdiagnosed with another condition before being diagnosed with type 1 diabetes. The diagnosis was missed in 16% of those who were diagnosed at <18 years of age and in 38.6% of those who were diagnosed at ≥18 years of age (χ2[1] = 137.2, P <0.001). Across seven age-groups (ages 0–6, 7–12, 13–17, 18–29, 30–39, 40–49, and ≥50 years), rates of missed diagnosis of type 1 diabetes rose as individuals got older, with the exception of the 7–17 years age-group (χ2[6] = 183.78, P <0.001) (Figure 1). Fifteen percent of those diagnosed before 1985 reported being misdiagnosed, compared to 20.4% of people diagnosed between 1985 and 1999, and 29.5% of people who were diagnosed after 2000 (χ2[2] = 47.7, P <0.001).

FIGURE 1.
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FIGURE 1.

Percentage of patients misdiagnosed, by age-group.

People ≥18 years of age whose type 1 diabetes diagnosis was missed were most likely to be initially diagnosed with type 2 diabetes (76.8%), whereas those <18 years of age were more likely to be diagnosed with the flu or other viral infection (53.7%) (Table 3).

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TABLE 3.

Misdiagnosed Conditions

DKA at Diagnosis

At diagnosis, 66.1% were hospitalized, and 40.9% experienced DKA. Of the participants who were in DKA, 38.1% reported vomiting, and 89.2% required intravenous (IV) fluids. Not surprisingly, those in DKA at diagnosis also reported higher blood glucose levels compared to those who did not experience DKA at diagnosis (t[1411.1] = 16.86, P <0.001).

Pediatric patients were more likely to be in DKA (48.0 vs. 28.1%; relative risk [RR] 1.71, 95% CI 1.51–1.93, P <0.001) and more likely to need IV fluids (92.9 vs. 78.4%; RR 1.18, 95% CI 1.10–1.28, P <0.001).

A two-way ANOVA was conducted to assess the impact of age at diagnosis and the influence of DKA on blood glucose values at diagnosis. There was a main effect of age (F[6, 1,772] = 24.78, P <0.001), a main effect of DKA (F[1, 1,772] = 242.23, P <0.001), but no interaction effect of these variables on blood glucose (F[6, 1,772] = 1.2, P >0.05).

Patients with a missed diagnosis of type 1 diabetes were at a 17.6% increased risk for DKA compared to those who were correctly diagnosed at onset (45.2 vs. 38.4%; RR 1.176, 95% CI 1.05–1.32, P <0.05). However, this relationship was only found for those <18 years of age at diagnosis. Sixty-eight percent of children with a missed type 1 diabetes diagnosis experienced DKA compared to 42.8% of children whose diagnosis was not missed (RR 1.58, 95% CI 1.41–1.77, P <0.001). There was no difference in the rate of DKA between those whose type 1 diabetes diagnosis was missed and those who were correctly diagnosed with type 1 diabetes as adults.

Twenty-one percent of all study participants reported being admitted to an intensive care unit (ICU) while in the hospital. The majority of those admitted to the ICU were in DKA (83.4%). One-fourth (25.0%) of those admitted to the ICU were unconscious.

Discussion

This study evaluated self-reported data from 2,526 individuals with type 1 diabetes or caregivers of children with type 1 diabetes surrounding their experience at the time of type 1 diabetes diagnosis. Initial symptoms differed between the adult and pediatric groups and were consistent with previous reports (11,15,23,29,31).

Type 1 diabetes was initially missed in a staggering 39% of patients diagnosed as adults, with more than three-fourths of those adults receiving an incorrect diagnosis of type 2 diabetes. Although type 1 diabetes and type 2 diabetes share some similarities, the phenotypes and treatments are different. People with type 1 diabetes must take insulin, whereas people with type 2 diabetes can often be treated successfully by other means. Misdiagnosis of type 1 diabetes as type 2 diabetes therefore often triggers a treatment algorithm without insulin, resulting in prolonged hyperglycemia and the risk of unfavorable outcomes, including DKA. Fortunately, missed diagnoses of type 1 diabetes in adults in this study were not associated with an increased risk of DKA. The fact that adults typically have a slower decline in insulin production than children may be a protective factor because this slower decline may result in longer symptomatic periods before the onset of DKA and overall lower rates of DKA at onset (19–24). Genetic screening and monitoring for β-cell autoimmunity at diagnosis, which has demonstrated decreased severity of illness and frequency of DKA, may be beneficial (29,31,32).

Because type 2 diabetes is nearly 20 times more prevalent than type 1 diabetes in adults, there is frequently a diagnosis bias in which type 1 diabetes is misdiagnosed as type 2 diabetes. Type 1 diabetes should be considered as a possible diagnosis in adults presenting with hyperglycemia, especially in those who do not match the phenotype of coexistent obesity, hyperlipidemia, and signs of insulin resistance (12,22,33–35).

The diagnosis of type 1 diabetes was missed in fewer patients with type 1 diabetes onset during childhood or adolescence than in their adult counterparts, but unlike the adults, there was a strong association between misdiagnosis and the likelihood of DKA in this group. In addition to the dangers and hospital costs of DKA, this condition is also associated with a lower frequency of partial remission and poorer long-term glycemic management (36). As previously noted, DKA is the leading cause of death in youth with type 1 diabetes (5,31,35). In a recent analysis from the Virginia Health Information database, it was noted that the cost of DKA was >$12,000 per episode (37). Therefore, a timely diagnosis of type 1 diabetes among youth is vital to improve outcomes.

The most common alternate diagnoses in children and adolescents were infectious diseases. Viral and bacterial infections are common in these age-groups and may be the family’s chief concern for seeking medical attention. Many symptoms of viral illnesses are nonspecific and may overlap with new-onset type 1 diabetes. Awareness campaigns focusing on symptoms more specific to type 1 diabetes, including polyuria, polydipsia, and recent onset of bedwetting have proved successful in significantly reducing the DKA rate in new-onset type 1 diabetes (17,27,38). Global campaigns that target HCPs, educators, and families and focus on the most common early symptom of type 1 diabetes (i.e., polyuria) through clear and concise communication may be one way to reduce the incidence of incorrect or delayed diagnosis and to reduce DKA during this period (17,27,39).

Based on the information reported by study participants, adult HCPs should consider type 1 diabetes when diagnosing type 2 diabetes, and pediatric HCPs should rule out type 1 diabetes as a possible diagnosis when a patient reports nonspecific symptoms. Improved diagnostics that will result in timely and accurate type 1 diabetes diagnoses and clinical classification of diabetes subtype are crucial. It is currently unknown whether electronic health record functionalities and interoperability between institutions could offer emergency and primary care clinicians decision support to increase the likelihood of identifying new-onset type 1 diabetes. For example, weight loss in a growing child could trigger alerts suggesting inexpensive glucose testing, and a diagnosis of type 2 diabetes in a nonobese adult could similarly offer the option to check diabetes antibodies.

Analogous to recent work to raise awareness of missed diagnosis or misdiagnosis of heart disease in women, it is important to raise awareness among HCPs regarding the frequency of type 1 diabetes being misdiagnosed as type 2 diabetes in adults. Education and quality improvement efforts to increase HCP awareness and highlight differences between adult and pediatric symptom presentation is key. Furthermore, it is important to build public awareness programs to increase awareness and promote early diagnosis for type 1 diabetes and prevent DKA. Collaboration with medical communities, health organizations, local hospitals, and community clinics, as well as school-based health centers, will be crucial to maximize the implementation, coordination, and success of these public health efforts to save lives and health care dollars.

Strengths

Although type 1 diabetes accounts for a small percentage of all people with diabetes, recent evidence suggests that >40% of patients with autoimmune diabetes are diagnosed after 30 years of age (35). Our results emphasize the importance of improving diagnostic pathways for adults with new-onset diabetes.

Self-reports allowed for inclusion of the patient voice on a first-person basis. The inclusion of first-person reports allowed the research team and readers to become familiar with and appreciate the diagnosis experience of >2,500 people who are navigating the daily demands of type 1 diabetes. Social media and computer-based methods provided a low-cost opportunity to recruit a large number of individuals relatively quickly.

Limitations

Although self-reported data provide an important, first-person account of the type 1 diabetes experience by patients or their caregivers, the retrospective nature of the study introduced the possibilities of ascertainment and recall biases. The consent process and surveys were completed online; therefore, individuals who participated in this study may represent a more highly educated or technology-savvy sample than the general population of people with type 1 diabetes. In addition, our sample did not include an ethnically diverse population, possibly reflecting a self-selection bias for Caucasian ethnicity.

Future Directions

Future studies should collect additional data to obtain a more comprehensive understanding of the diagnosis and DKA experience of individuals with type 1 diabetes. For example, information about treatment-seeking behaviors and the psychological impact of the DKA experience resulting from delayed diagnosis or misdiagnosis could be insightful regarding the impact of patient factors on the diagnosis and treatment process. Given known disparities in diabetes, assessing the DKA experience among a diverse group of individuals is important (38,40). In addition, gathering data on health insurance information would be beneficial given previous findings that lack of adequate health insurance coverage can negatively affect health-seeking behaviors (38).

Acknowledgments

Duality of Interest

D.J. has received institutional grants from AstraZeneca, Boehringer Ingelheim, and Novo Nordisk for center participation in multicenter pharmacology trials. G.T.A. has been a paid speaker for Roche Diabetes Care. No other potential conflicts of interest relevant to this article were reported.

Author Contributions

C.M. wrote the manuscript; A.F. wrote the survey for data collection and reviewed/edited the manuscript; C.G. analyzed data and reviewed/edited the manuscript; and T.K., D.J., G.T.A., and A.M.-F. contributed to the discussion and reviewed/edited the manuscript. A.M.-F. is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

  • © 2019 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See www.diabetesjournals.org/content/license for details.

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Clinical Diabetes: 37 (3)

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July 2019, 37(3)
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Misdiagnosis and Diabetic Ketoacidosis at Diagnosis of Type 1 Diabetes: Patient and Caregiver Perspectives
Cynthia Muñoz, Anna Floreen, Colleen Garey, Tom Karlya, David Jelley, G. Todd Alonso, Alicia McAuliffe-Fogarty
Clinical Diabetes Jul 2019, 37 (3) 276-281; DOI: 10.2337/cd18-0088

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Misdiagnosis and Diabetic Ketoacidosis at Diagnosis of Type 1 Diabetes: Patient and Caregiver Perspectives
Cynthia Muñoz, Anna Floreen, Colleen Garey, Tom Karlya, David Jelley, G. Todd Alonso, Alicia McAuliffe-Fogarty
Clinical Diabetes Jul 2019, 37 (3) 276-281; DOI: 10.2337/cd18-0088
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