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Prevalence and risk factors of the metabolic syndrome in young adults with childhood-onset hypopituitary growth hormone deficiency

Volume 53(10); October

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Article Contents

Clin Exp Pediatr > Volume 53(10); 2010
Lim, Kang, Yun, Lee, Shin, and Yang: Prevalence and risk factors of the metabolic syndrome in young adults with childhood-onset hypopituitary growth hormone deficiency

Abstract

Purpose

This study evaluated the prevalence of the metabolic syndrome (MetS) and risk factors for metabolic derangement in young adults with childhood-onset hypopituitary growth hormone deficiency (ACOHGHD).

Methods

Thirty patients with ACOHGHD who were treated with hormone-replacement therapy, aged 18 to 29 years, who visited the Seoul National University Children's Hospital between September 2009 and February 2010 were enrolled. Height, weight, waist circumference, hip circumference, and blood pressure were measured, and the clinical and hormonal features were reviewed retrospectively. We evaluated measures of metabolic derangement in the enrolled patients and in the data of healthy adults aged 20 to 29 years taken from the 2005 Korean National Health and Nutrition Examination Survey (KNHANES) as part of the National Cholesterol Education Program-the Adult Treatment Panel III.

Results

Compared with the KNHANES participants, patients with ACOHGHD had significantly large waist circumference (men and women), high systolic blood pressure (BP) (women) and diastolic BP (men), and high serum triglyceride levels (women). The duration of illness correlated significantly with central obesity (r2=0.546, P=0.003). The prevalence of MetS was 10% in patients with ACOHGHD and 2.3% in KNHANES participants. The prevalence of central obesity and MetS was higher in patients with ACOHGHD than in KNHANES participants (P<0.001 and P=0.042, respectively).

Conclusion

Abdominal obesity correlated with the duration of illness in patients with ACOHGHD. Waist circumference should be measured in the clinic to prevent MetS, particularly in patients with a long history of ACOHGHD, regardless of age or sex.

Introduction

Adults with hypopituitarism have shorter life expectancy compared with the general population. Growth hormone deficiency (GHD) may contribute to the 1.5- to fourfold increase in cardiovascular mortality and 2.5- to threefold increase in cerebrovascular mortality observed in these patients1-3). Growth hormone (GH) replacement can improve body composition and cardio- and cerebrovascular risk factors associated with GHD3, 4). In children and adolescents with GHD, the primary role of GH is to promote linear growth. In adults, after achieving their final adult height, GH replacement in adults with persistent GHD prevents metabolic imbalances such as those associated with obesity, osteoporosis, and fatty liver5, 6). The components of the metabolic syndrome (MetS) are central obesity, high blood pressure (BP), high serum triglyceride (TG) level, low serum high density lipoprotein cholesterol (HDLC), and impaired fasting glucose tolerance7, 8). GH replacement in patients with GHD may increase BP and insulin and glucose levels, referred to as the insulin-antagonistic effect9), or may decrease central obesity. Johannsson and Bengtsson10) noted that the adult GHD phenotype shares features such as abdominal obesity, dyslipidemia, and insulin resistance with the MetS, which represents a cluster of risk factors for cardiovascular disease and type 2 diabetes7, 11). A recent report showed that the prevalence of the MetS in adult patients with GHD is unaffected by GH replacement, but that baseline MetS status and obesity are strong predictors of the development of the MetS after GH treatment12). However, little is known about metabolic derangements in adult patients with childhood-onset hypopituitary growth hormone deficiency (ACOHGHD) being treated with pituitary hormone replacement including GH.
The aims of this study were to evaluate the prevalence of the MetS and to analyze the risk factors for metabolic abnormalities in patients with ACOHGHD being treated with hormone-replacement therapy (HRT), and to compare relevant variables between patients with ACOHGHD being treated with HRT and healthy young adults.

Materials and methods

1. Patients

The total subject pool was 109 patients (63 men, 46 women) with ACOHGHD being treated with HRT, who visited Seoul National University Children's Hospital between September 2009 and February 2010. Fifty-six of these patients completed the test for MetS during this time, and 30 patients (15 men, 15 women) who met the following criteria were enrolled. The inclusion criteria were that: 1) the patient had achieved a final height confirmed by epiphyseal fusion on wrist x-ray, 2) the patient was 18 to 29 years of age, 3) the patient was deficient in pituitary hormone and was taking replacement therapy, and 4) ACOHGHD was confirmed by a GH provocation test and the patient was being treated with an adult dose of GH. The exclusion criteria were that: 1) the patient had not been treated with GH from the diagnosis of pituitary GHD, and 2) the patients had chromosomal anomalies or inborn error of metabolism. We used and based on the control data, 639 adults aged 20 to 29 years (264 males, 375 females) from the 2005 Korean National Health and Nutrition Examination Survey (KNHANES).

2. Methods

The patients' medical records were examined retrospectively, and the following variables were recorded: age, sex, underlying diseases, treatment methods for underlying diseases, deficient pituitary functions and hormones, and the use of HRT. We measured height, weight, waist circumference, hip circumference, waist-to-hip ratio (WHR), BP, and fasting laboratory values such as the serum concentrations of total cholesterol (TC), TG, HDLC, low-density lipoprotein cholesterol (LDLC), fasting blood glucose (FBG), insulin, C-reactive protein (CRP), uric acid, aspartate aminotransferase (AST), alanine aminotransferase (ALT), and total bilirubin. Body mass index (BMI) was calculated as the weight (kg) divided by the height (m) squared and is expressed as kg/m2. Compliance with HRT was evaluated by measuring the serum level of insulin-like growth factor-1 (IGF-1), free thyroxine, follicle-stimulating hormone, luteinizing hormone, and testosterone or estradiol. The various components of the MetS were assessed in both the ACOHGHD patients treated with HRT and in the 2005 KNHANES participants. According to the criteria formulated by the National Cholesterol Education Program - the Adult Treatment Panel III (NCEP-ATP III) - the MetS was diagnosed if three or more of the following symptoms were present: 1) central obesity according to the Asian definition (waist circumference ≥90 cm in men or ≥80 cm in women), 2) elevated TG level (≥150 mg/dL), 3) low HDLC level (<40 mg/dL in men or <50 mg/dL in women), 4) elevated BP (systolic BP ≥130 mmHg and/or diastolic BP ≥85 mmHg), and 5) increased FBG level (≥100 mg/dL using the 2006 cutoff of the International Diabetes Federation (IDF)7, 8).
We defined the cutoff points between thin (BMI <23), overweight (23≤BMI<25), and obesity (BMI ≥25) using the proposed Asian Pacific Island population cutoff points according to the World Health Organization and the International Obesity Task Force13, 14). Waist circumference was measured to the nearest 0.1 cm at the narrowest point between the lowest rib and the uppermost lateral border of the right iliac crest. BP was measured after the subject had rested for 5 minutes in a sitting position and was recorded as the mean of two measurements. The homeostasis model assessment-insulin resistance (HOMA-IR) index and the quantitative insulin-sensitivity check index (QUICKI) for insulin resistance and sensitivity were calculated using the following equations:
  • HOMA-IR=[fasting glucose (mmol/L)×fasting insulin (mg/dL)]/22.5

  • QUICKI=1/[log(I0)+log(G0)], where I is fasting insulin concentration (µU/mL) and G0 is FBG concentration (mg/dL).

3. Statistics

The patients' age, sex, and duration of illness are presented as mean and standard deviation. The data for underlying diseases and multiple pituitary hormone deficiencies were analyzed using frequency analysis. The Kruskal-Wallis test was used to analyze the changes in the components and related laboratory results of the MetS in subjects categorized by BMI. Components of the MetS were compared between patients and KNHANES participants using an independent t test or the Mann-Whitney U test. Spearman's correlational analysis and univariate and multivariate linear regression analyses were used to identify the causative factors for central obesity. The relative risk and 95% confidence interval were analyzed using Fisher's exact test to compare the prevalence of metabolic abnormalities between patients and KNHANES participants. The data were analyzed using SPSS version 12.0 for Windows (SPSS Inc., Chicago, IL, USA), and a P value <0.05 was considered significant.

Results

1. Clinical information for patients with ACOHGHD

The mean age was 23.1 years and this did not differ between men and women. The mean age of onset of the underlying disease was 9.6 years. The median of BMI was 24.0 kg/m2 (range, 18.9-39.8). The mean duration of hypopituitary GHD was 15.7 years, and the mean duration of GH treatment was 10.1 years. The underlying diseases of GHD included a germ cell tumor in 10 patients (33.3%), craniopharyngioma in seven patients (23.3%), medulloblastoma in four patients (13.3%), and idiopathic disease in three patients (10.0%). Before and after the treatment for underlying diseases, 13 patients (43.4%) developed all form of pituitary dysfunction, such as GHD, hypothyroidism, hypogonadism, hypocortisolism, and diabetes insipidus; seven patients (23.3%) showed GHD plus one other pituitary hormone deficiency; and three patients (10.0%) had isolated GHD (Table 1).

2. Correlation between parameters of the MetS and BMI

Three groups (thin, overweight, and obese) were classified according to BMI. Of the various metabolic parameters tested, including waist circumference, hip circumference, WHR, BP, and levels of TC, TG, HDLC, FBG, fasting insulin, CRP, uric acid, AST, ALT, TB, and IGF-1, only WHR correlated significantly with BMI (P=0.002). The level of uric acid (P=0.078) and the ALT (P=0.052) were not significant, but they were associated with BMI. The number of abnormal components of the MetS according to the NCEP-ATP III criteria showed a significant increase according to elevated BMI (P=0.030) (Table 2).

3. The number of abnormal components of the MetS according to the NCEP-ATP III criteria

In men, waist circumference was significantly higher in patients with ACOHGHD than in KNHANES participants, and diastolic BP and TG level were significantly lower in patients. In women, waist circumference, systolic BP, and serum TG level were significantly higher in ACOHGHD patients than in KNHANES participants. HDLC and FBG levels did not differ between ACOHGHD patients and KNHANES participants. Diastolic BP in men (P<0.001) and TG level in women (P<0.001) differed the most between ACOHGHD patients and KNHANES participants (Table 3).

4. Risk factors for central obesity in ACOHGHD patients

Correlational analysis was used to determine whether waist circumference was related to components of the MetS, related laboratory blood tests for the MetS, age, and the duration of illness. Waist circumference correlated significantly with the levels of uric acid and ALT, the number of MetS components, and the duration of illness. However, after controlling for the mutual relationships between variables including age, only the duration of GHD correlated significantly with waist circumference (r2=0.546, P=0.003) (Fig. 1).

5. Prevalence of individual metabolic risk factors and the MetS (NCEP-ATP III criteria and the 2006 IDF cutoff) in ACOHGHD patients and 2005 KNHANES participants

The prevalence of central obesity was higher in ACOHGHD patients than in KNHANES participants (P<0.001). Other components did not differ significantly between groups, but hypertension was associated with ACOHGHD (P=0.054). The prevalence of the MetS was significantly higher in ACOHGHD patients than in KNHANES participants (10% vs 2.3%, respectively, P=0.042) (Table 4).

Discussion

This study showed that the prevalence of the MetS was higher in ACOHGHD patients treated with an appropriate dose of HRT including GH than in the age-matched general population (10% vs 2.3%, respectively, P=0.042). The prevalence of central obesity was significantly higher in the patients than in the general population (P<0.001). Multivariate linear analysis showed a significant correlation between central obesity and the duration of hypopituitarism (r2=0.546, P=0.003).
Obesity is a cardinal feature of the MetS. Insulin resistance can be caused by central obesity and can lead to metabolic complications7). Previous reports show that in the general population, the prevalence of the MetS increases with age in parallel with age-related increases in the prevalence of obesity and, in particular, central obesity15-17). The HOMA-IR and QUICKI are methods to quantify insulin resistance and sensitivity, respectively18). In this study, central obesity was the most prominent feature that differed between the ACOHGHD patients treated with HRT and the KNHANES participants. However, HOMA-IR, QUICKI, and HDLC and FBG levels did not differ significantly between groups. In the ACOHGHD patients, the severity of central obesity correlated positively with the duration of hypopituitary GHD but not with age. These results suggest the existence of an additional, unidentified cause of the MetS in ACOHGHD patients. Attanasio et al12) suggested that patients exhibit metabolic abnormalities caused by GHD and possibly inadequate replacement therapy in addition to preexisting, GHD-independent conditions, notably obesity and its consequences. They suggested that it is difficult to establish to what extent the MetS in an individual patient is caused by GHD alone or by preexisting obesity or both. Two recent studies reported no effect of GH replacement on the prevalence of MetS defined by NCEP-ATP III criteria in GHD patients19, 20). In longitudinal population-based cohort studies, the persistence of the MetS was found to be variable and to be influenced by factors such as aging, new treatment interventions, and intraindividual variability of laboratory measurements21). However, a significant reduction in central obesity, as shown by reduced waist circumference, may reflect the effect of GH treatment22). In patients with hypopituitarism, HRT cannot provide perfect physiological hormone regulation or balance. The difference (mean interval of 5.6 years in our study) between the duration of illness and the duration of GH treatment may influence adverse metabolic consequences such as metabolic syndrome. The MetS may be influenced by the underlying disease itself, drugs such as anticancer agents, antibiotics, immune modulators, radiation therapy, related hypothalamic conditions, and multiple pituitary hormone deficiencies. We hypothesized that the central obesity in ACOHGHD patients with HRT developed because of accumulation of the effects mentioned above and that there would be minimal differences in relation to illness duration. However, in this study, waist circumference or the MetS did not correlate significantly with the underlying diseases, treatment, duration of GH use, or the extent of pituitary dysfunction, although we did not study preexisting obesity.
In the general population, the age-adjusted prevalence of the MetS differs somewhat between women and men, but the direction of that difference is inconsistent between cohorts7, 12, 23, 24). In contrast to the general population, the women in the present GHD cohort had a higher relative risk for the MetS. Such higher risk in women has been reported in adult hypopituitary GHD patients. A recent study of 750 adult Swedish GHD patients found an increased prevalence of type 2 diabetes mellitus in women compared with men, suggesting that aspects related specifically to GHD or hypopituitarism contribute to this difference9, 12, 25). The 2005 KNHANES data showed that the prevalence of the MetS in people in their 20s was 4.7% of men and 1.2% of women (The results did not described in Table 3). In our study, systolic BP, diastolic BP, TG level, and the prevalence of the MetS differed between men and women (Table 3). The prevalence of the MetS in the GH-treated ACOHGHD patients aged 18-29 years was 6.7% in men and 13.3% in women (The results did not described in Table 3). The higher prevalence of the MetS in women with ACOHGHD might be associated with higher TG levels in these patients than in the KNHANES participants (P<0.001) or in men with ACOHGHD. However, it is unclear whether the higher TG level was an effect of GH treatment or why TG level was higher in women than in men in our study.
A few reports found that the adult-onset form GHD is more likely to be associated with the MetS than is childhood-onset GHD26-28). These reports suggested that one major reason for this may be the difference in the age ranges of patients in the two onset groups because of the developmental nature of their condition. Childhood-onset GHD patients are exposed to the consequences of GHD or hypopituitarism from childhood and may accumulate metabolic risks. However, the childhood-onset GHD patients' thresholds for abnormaities of the individual MetS components may not be similar to normal adult populations. In this respect, these reports noted that there are limited and inconsistent data on the morbidity and mortality of adult patients with childhood-onset GHD.
We found a significant relationship between waist circumference and the duration of illness, suggesting that they may be important factors when assessing the risk of the MetS in ACOHGHD patients with HRT. The current primary goal in the treatment of hypopituitary GHD patients with HRT is to maintain the normal range of pituitary hormone levels. Our data suggest that the patient's waist circumference, an indicator of central obesity, should also be checked as part of the strategy in the prevention of and early intervention for the MetS and related complications, especially in patients with a long history of GHD or hypopituitary illness.
Our study has some limitations. It used a retrospective cross-sectional design with a small number of young patients. We did not correct for other possible contributors to the MetS, such as nutrition, physical inactivity, alcohol intake, smoking, socioeconomic status, family history. Long-term follow-up studies of larger groups are needed to understand the changes in metabolic derangement after childhood in these patients.

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Fig. 1
Correlation between waist circumference and duration of hypopituitarism. Multivariate linear analysis showed that the severity of central obesity correlated positively with the duration of hypopituitary growth hormone deficiency.
kjped-53-892-g001.jpg
Table 1
The Clinical Characteristics of the Patients (N=30)
kjped-53-892-i001.jpg

*Mean (SD)

Others include Langerhan's cell histiocytosis, optic glioma, pilocytic astrocytoma, primitive neuroectodermal tumor, agenesis of septum pallucidum, mycobacterial meningitis.

Abbreviations : GHD, growth hormone deficiency

Table 2
Prevalence of the Metabolic Syndrome according to Body Mass Index
kjped-53-892-i002.jpg

*P-valuse was calculated by Kruskal-Wallis Test

This result represents mean±SD

This result means median (range)

Abbreviations : WHR, waist to hip ratio; ALT, alanine aminotransferase

Table 3
Comparison of Metabolic Components Between ACOHGHD Patients and 2005 KNHANES Participants
kjped-53-892-i003.jpg

*This results were analyzed using independent t test

This results were analyzed using Shapiro-Wilk test and Mann-Whitney U test

Abbreviations : ACOHGHD, young adults with childhood-onset hypopituitary growth hormone deficiency; KNHANES, Korean National Health and Nutrition Examination Survey; WC, waist circumference; SBP, systolic blood pressure; DBP, diastolic blood pressure; TG, triglyceride; HDLC, high density lipoprotein cholesterol; FBG, fasting blood glucose

Mean (SD)

Table 4
Prevalence of Metabolic Abnormalities (NCEP-ATP III Criteria) in ACOHGHD Patients and 2005 KNHANES Participants
kjped-53-892-i004.jpg

*This results were analyzed using Fisher's exact test

Abbreviations : ACOHGHD, young adults with childhood-onset hypopituitary growth hormone deficiency; KNHANES, Korean National Health and Nutrition Examination Survey; NCEP-ATP III, National Education Cholesterol Program-Adult Treatment Panel III, HDL, high density lipoprotein; CI, confidence interval

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