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Adrenal suppression from high-dose inhaled fluticasone propionate in children with asthma

D. Sim, A. Griffiths, D. Armstrong, C. Clarke, C. Rodda, N. Freezer
European Respiratory Journal 2003 21: 633-636; DOI: 10.1183/09031936.03.00306302
D. Sim
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A. Griffiths
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D. Armstrong
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C. Clarke
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C. Rodda
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N. Freezer
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Abstract

This cross-sectional study was designed to examine the prevalence of adrenocortical suppression in children with asthma treated with high-dose inhaled fluticasone propionate (FP).

Children and adolescents (n=50) with asthma, treated with inhaled FP at a dose of ≥1,000 mg a day for ≥6 months, were enrolled. Early morning serum cortisol was performed. Subjects with a serum cortisol of <400 nmol·L−1 had a tetracosactrin stimulation test.

Fifty subjects of mean age 13.1 yrs were treated with a mean dose of 924.7 µg·m−2·day−1 FP for a mean duration of 2 yrs. Of the 50 subjects, 36 (72%) had serum cortisol levels of <400 nmol·L−1 and underwent tetracosactrin stimulation test. Of these, 6 (17%) demonstrated a less than two-fold increase in serum cortisol from baseline and peak cortisol level of ≤550 nmol·L−1 at 30 or 60 min poststimulation. There was a significant negative correlation between the dose of FP·m−2 and stimulated peak cortisol level.

Biochemical evidence of adrenocortical insufficiency was demonstrated in 12% of the subjects, indicating that high-dose fluticasone propionate use may be associated with dose-dependent adrenocortical suppression.

  • adrenal suppression
  • asthma
  • children
  • flixotide

Inhaled corticosteroids are an important part of asthma management in children with frequent episodic or persistent asthma symptoms. Their use allows for a reduction in oral glucocorticoid use, better control of asthma and improved quality of life 1–3. However, inhaled corticosteroids are known to be associated with dose-related systemic effects, and potential effects on the hypothalamic pituitary adrenal (HPA) axis, bone mineralisation and growth have been reported 4–6.

Fluticasone propionate (FP) is the most recent addition to the range of inhaled corticosteroids available in Australia. FP may produce greater dose-related adrenal suppression than budesonide or beclomethasone 3. This observation has been explained by FP's high glucocorticoid receptor affinity and high lipophilicity, which result in greater tissue distribution, prolonged pulmonary receptor occupancy and longer plasma half-life 4, 7–10. After repeated doses, FP demonstrates a moderate degree of accumulation 8, 9. It has been suggested that such accumulation may play a more important role in HPA axis suppression than peak plasma concentrations 10, 11.

HPA axis suppression over a prolonged period of time can result in adrenal cortical atrophy 4. This condition can predispose a person to life-threatening acute adrenal insufficiency if the adrenal cortex is unable to generate an adequate endogenous cortisol response to a stressful condition or when corticosteroid therapy is abruptly ceased.

Data from adult studies suggest that FP in doses of >750 µg·day−1 is associated with suppression of the HPA axis 4. Paediatric studies suggest that FP in doses of ≤400 µg·day−1 does not produce significant systemic adverse effects 4, 11–13.

The effects of higher doses of inhaled FP in children with asthma are unclear. Published case reports have described FP-induced growth retardation 14, Cushing's syndrome 15 and adrenal suppression 14, 16 in children with asthma receiving doses ranging 250–2,250 µg·day−1. There have been few studies examining HPA axis suppression in children with asthma treated with FP at high doses and the prevalence rate of such adverse effects at these high doses of FP is unclear.

Measures of HPA axis function are a sensitive method of assessing the systemic effects of inhaled corticosteroid therapy 10. In addition, measuring the cortisol response to a stimulation test allows evaluation of the adrenal reserve, hence the risk of adrenal insufficiency during periods of illness or stress.

The aim of this cross-sectional study was to determine the prevalence of HPA axis suppression in children with asthma on long-term treatment with high-dose inhaled prophylactic FP.

Materials and methods

Study subjects

Children and adolescents with asthma were recruited from asthma clinics at Monash Medical Centre, Melbourne, Australia, from August 1999–August 2000. Inclusion criteria were subjects with chronic asthma with a dose of FP titrated to a minimum effective dose of ≥1,000 µg·day−1 for a duration of ≥6 months prior to enrolment. Subjects were excluded if they had another chronic illness, were known to be nonadherent with asthma therapy or had received oral or systemic steroids during the study period or within 2 weeks of enrolment. All subjects were on a twice-daily dosage regimen, used either a metered-dose inhaler (MDI) with spacer device or Accuhaler® (GlaxoSmithKline, Melbourne, Australia) delivery system, and had been routinely instructed to mouth rinse after FP administration. The study was approved by the Southern Health Care Network Human Research and Ethics Committee and informed consent was obtained from all subjects and their legal guardian.

Study design

A baseline early morning serum cortisol specimen was obtained from all subjects between 08:00–10:00 h. Those subjects with a morning serum cortisol level <400 nmol·L−1 underwent a short tetracosactrin stimulation test to evaluate their adrenal reserve.

Methods

In the paediatric population, significant interpatient variability exists in the normal endogenous activity of the HPA axis 17. Published reference ranges for normal serum cortisol levels in children are wide 18, 19 and there has been uncertainty about what levels of early morning serum cortisol would unequivocally indicate normal HPA function 20. For the purposes of this study, a threshold level of 400 nmol·L−1 for early morning serum cortisol was selected, based on the reference range in clinical use by the pathology laboratories at the authors' institution 18.

All subjects were withheld from FP therapy for ≥30 h prior to collection of early morning serum cortisol specimens. All specimens were collected by venepuncture between 08:00–10:00 h. Subjects with a morning serum cortisol level of ≥400 nmol·L−1 were deemed to have normal adrenal function.

Subjects with morning serum cortisol levels <400 nmol·L−1 underwent a short tetracosactrin stimulation test involving the intramuscular injection of 250 µg tetracosactrin (Synacthen; Novartis Pharmaceuticals Australia Ltd, Sydney, Australia) with serum cortisol samples taken at 0, 30 and 60 min by venepuncture, following the application of a eutectic mixture of local anaesthetic cream (Astrazeneca Pty Ltd, Sydney, Australia). A normal response was defined as achieving a stimulated cortisol value of ≥550 nmol·L−1 with a two-fold or greater increase from baseline cortisol value 21. The serum cortisol specimens were assayed at the Biochemistry Unit of the Department of Pathology, Southern Health Care Network (Melbourne, Australia) using an Immulite immunoassay (Diagnostic Products Corporation, Los Angeles, CA, USA).

Adherence to medication was assessed indirectly by subject and parent interview, serial forced expiratory volume in one second measurements, and clinic and hospital attendance records. Symptoms suggestive of adrenal insufficieny (fatigue, unexpected weight loss, anorexia, faints, prolonged recovery from intercurrent illnesses) were sought in the interviews.

Statistical analysis

This cross-sectional study determined the prevalence of adrenal suppression in a population of children with asthma treated with high-dose FP. The results were examined to determine whether a significant dose/effect correlation existed. Pearson's product moment correlation coefficient (r) was obtained. As some of the data was nonparametric, Spearman's coefficient was also calculated. The null hypothesis was rejected if statistical significance, defined as a p<0.05, was obtained.

Results

Potential subjects (n=69) were identified from clinic records and 50 were enrolled. Nineteen children were excluded for reasons of coexisting endocrine condition (two subjects), recent oral steroid therapy (six subjects), self-declared poor adherence to prophylactic asthma therapy (four subjects), recent reduction in dose of FP to <1,000 µg·day−1 (four subjects) and refusal to consent to tetracosactrin stimulation test (three subjects). None reported any symptoms suggestive of adrenal insufficiency.

The subjects were of median age 13.5 yrs (range 4–20 yrs) and had been treated with a mean FP dose of 1,280 µg·day−1 or 924.7 µg·m−2·day−1 (range 476–2,985 µg·m−2·day−1) for a mean duration of 2 yrs (range 0.5–5 yrs).

Early morning serum cortisol levels were obtained from all of the 50 enrolled subjects. The mean level was 318 nmol·L−1 (median 256 nmol·L−1, range 27–927 nmol·L−1). Baseline early morning serum cortisol levels <400 nmol·L−1 were demonstrated by 36 subjects (72%).

All 36 subjects who demonstrated a low early morning cortisol level underwent a short tetracosactrin stimulation test. The mean stimulated peak cortisol level was 681 nmol·L−1 (median 725 nmol·L−1, range 89–1,063 nmol·L−1). Six subjects (17%) demonstrated a stimulated peak serum cortisol level of <550 nmol·L−1 or a less than two-fold increase from baseline level and therefore demonstrated biochemical evidence of adrenal insufficiency. Of these subjects, three had a baseline serum cortisol of <100 nmol·L−1 and were thus commenced on hydrocortisone replacement therapy (10–15 mg·m−2·day−1) for ≥2 months before the dose was weaned over a period of 3 months.

A negative correlation between the absolute dose of FP received and stimulated peak cortisol level of −0.35 (p=0.034) was demonstrated. This correlation improved to −0.42 (p=0.010) when the dose of FP was corrected for body surface area (fig. 1⇓). Spearman's correlation coefficient reduced the effect of the outlier (rs=−0.33, p=0.08) but did not eliminate it completely. The correlation between the baseline early morning serum cortisol level and the absolute FP dose received (r=−0.099, p=0.493) was not statistically significant. This correlation strengthened slightly (r=−0.134, p=0.353) when the FP dose was corrected for body surface area but still failed to reach statistical significance.

Fig. 1.—
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Fig. 1.—

Peak stimulated cortisol levels. FP: fluticasone propionate.

Discussion

This study suggests that a significant number of paediatric patients receiving high-dose inhaled FP have biochemical evidence of adrenal suppression. This finding has implications for the management of intercurrent illnesses in these patients as well as their asthma.

This study demonstrated a significant negative correlation between the absolute dose of FP and the peak stimulated cortisol level. Statistically, this relationship improved when the dose of FP was corrected for body surface area. A similar dose/effect relationship was previously demonstrated by Priftis et al. 5 in children receiving beclomethasone.

There was no significant correlation between the dose of FP and the baseline early morning serum cortisol level. It was previously suggested that early morning cortisol levels are less sensitive in screening for adrenal suppression 22. It was observed that up to a three-fold difference in cortisol levels may occur within an individual between 08:00–10:00 h 17. These findings would suggest that an adrenal stimulation test is required to make a diagnosis of adrenal insufficiency.

The results of this study support the findings of Fitzgerald et al. 23, who found that 67% of children receiving 750 µg·day−1 of FP for 12 weeks had subnormal low-dose synacthen-stimulated peak serum cortisol levels. Kannisto et al. 24 concluded that 23% of their study cohort treated with 500 µg·day−1 FP or 800 µg·day−1 budesonide had subnormal cortisol responses after a low-dose adrenocorticotrophic hormone (ACTH) stimulation test. Using a similar low-dose ACTH test, Broide et al. 25 found that 35% of children treated with a mean dose of 500 µg·m−2·day−1 of budesonide or bethamethasone had a subnormal cortisol response.

The systemic bioavailability of FP may differ when various delivery devices are compared and other authors suggest that the risk of adverse systemic side-effects is proportional to the total body dose received. Newman and coworkers 26, 27 have shown that in asthmatic patients, the total body dose of a drug delivered by MDI and spacer is approximately one-half that from a dry-powder inhaler (DPI) or MDI without a spacer (38% MDI plus spacer versus 86% DPI, 90% MDI alone). As the lung deposition from the delivery devices is similar (15–25%), the difference is primarily the high oral deposition of the drug inhaled from DPIs or MDIs alone (72% DPI, 81% MDI versus 17% MDI plus spacer). Although the present study's numbers were too small to allow stratification of results by device, all patients with MDIs were instructed to use a spacer, and all patients were instructed to mouth rinse and spit out to reduce oral deposition and therefore total body dose received.

Self-reported adherence with FP was satisfactory in this study (mean 91.4%). Noncompliance with medications is still a potential confounder, which may have led to underestimation of the effect of FP on adrenal function in this study. However, given that almost one-quarter of the patients were on >1,000 µg·day−1, many would still meet the study inclusion criteria despite some reduction in adherence.

This study may have underestimated the number of subjects with impaired adrenal function by the use of a conventional dose (250 µg), short synacthen stimulation test (SST). It has been suggested that the low-dose (0.5–1.0 µg·1.73 m body surface area−2) short synacthen test (LDSST) may be more sensitive than the SST in revealing cases of mild adrenal insufficiency 20, 25, 28–30. However, Abdu et al. 31 found that using the LDSST alone to diagnose adrenal insufficiency lacked specificity with an 11% false-positive rate. The present authors chose to use the SST for this study as it is the standard clinical screening test for adrenal insufficiency in the paediatric population at the hospital, thus maintaining consistency with their current clinical practice. Moreover, the validity of the SST as a screening investigation has been reaffirmed by recent studies where it has been compared with the reference standard insulin tolerance test 22, 31–33.

In summary, the results of this study indicate that significant dose-related adrenal suppression may occur with high-dose inhaled FP used over a period of ≥6 months. An early morning serum cortisol level of <400 nmol·L−1 suggests the presence of adrenal suppression and an adrenal stimulation test is required for diagnosis. In the absence of stressful stimuli, these children would probably not report any clinical symptoms of adrenal insufficiency. Those who have a very low baseline serum cortisol (<100 nmol·L−1) may require maintenance hydrocortisone replacement therapy with a two-to three-fold dose increase for 48–72 h during periods of stress, fever or illness to minimise the risk of an adrenal crisis.

The risk of adrenal insufficiency from high-dose inhaled corticosteroids may be minimised by following the asthma management guidelines of the National Asthma Council 1 and British Thoracic Society 2. Both recommend using the minimum effective dose of inhaled corticosteroids to control a patient's asthma, administering inhaled steroids via an age-appropriate delivery system and the routine use of mouth-rinsing following each dose in older children and adolescents, particularly if dry-powder inhalers or metered-dose inhalers without spacers are used.

  • Received January 3, 2002.
  • Accepted May 25, 2002.
  • © ERS Journals Ltd

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Adrenal suppression from high-dose inhaled fluticasone propionate in children with asthma
D. Sim, A. Griffiths, D. Armstrong, C. Clarke, C. Rodda, N. Freezer
European Respiratory Journal Apr 2003, 21 (4) 633-636; DOI: 10.1183/09031936.03.00306302

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Adrenal suppression from high-dose inhaled fluticasone propionate in children with asthma
D. Sim, A. Griffiths, D. Armstrong, C. Clarke, C. Rodda, N. Freezer
European Respiratory Journal Apr 2003, 21 (4) 633-636; DOI: 10.1183/09031936.03.00306302
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