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Systemic effects of intratympanic dexamethasone therapy
Eva Novoa1, Marcel Gärtner2, Christoph Henzen2
1Department of OtorhinolaryngologyHead and Neck SurgeryClinic of EndocrinologyDiabetology and Clinical Nutrition, Department of Internal Medicine, Kantonsspital Luzern, CH-6000 Luzern 16, Switzerland eva.novoa@gmail.com.
Endocrine Connections
|July 25, 2014
Summary
Intratympanic dexamethasone (IT-Dex) did not affect the hypothalamic-pituitary-adrenal (HPA) axis, inflammation, or bone metabolism in patients. This study confirms IT-Dex is safe for systemic effects.
Area of Science:
- Otolaryngology
- Endocrinology
- Bone Metabolism
Background:
- Intratympanic dexamethasone (IT-Dex) is used for inner ear diseases.
- Systemic effects of IT-Dex on the hypothalamic-pituitary-adrenal (HPA) axis, inflammation, and bone metabolism are not well understood.
Purpose of the Study:
- To evaluate the systemic effects of IT-Dex on the HPA axis, inflammation, and bone metabolism.
- To assess the safety profile of IT-Dex regarding endocrine and metabolic functions.
Main Methods:
- Prospective cohort study of 30 adult patients receiving 9.6 mg IT-Dex over 10 days.
- Measured plasma and salivary cortisol, white blood cell count, and bone turnover biomarkers (osteocalcin, bone-specific alkaline phosphatase) before and after IT-Dex therapy.
- Collected additional bone turnover data 5 months post-therapy.
Main Results:
- IT-Dex was well tolerated with no significant impact on HPA axis function (stimulated cortisol levels).
- No changes were observed in bone turnover biomarkers (osteocalcin, BSAP) post-treatment or at 5 months.
- Peripheral white blood cell counts remained stable, indicating no significant inflammatory response.
Conclusions:
- Intratympanic dexamethasone therapy does not interfere with endogenous cortisol secretion.
- IT-Dex treatment does not appear to negatively impact bone metabolism or systemic inflammation.
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