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The Effect of Curative Treatment on Hyperglycemia in Patients With Cushing Syndrome
Justine Herndon1, Ravinder Jeet Kaur2, Mark Romportl1
1Division of Endocrinology, Diabetes and Nutrition, Mayo Clinic, Rochester, Minnesota 55905, USA.
Insights
Curative procedures significantly improve hyperglycemia in Cushing syndrome (CS) patients. Two-thirds experienced resolution or improvement, highlighting the need for monitoring during recovery.
Area of Science:
- Endocrinology
- Metabolic Disorders
- Surgical Outcomes
Background:
- Hyperglycemia is a frequent complication of Cushing syndrome (CS).
- Effective management of hyperglycemia in CS is crucial for patient outcomes.
Purpose of the Study:
- To evaluate the impact of curative procedures on hyperglycemia and its treatment in patients with Cushing syndrome.
- To identify factors associated with hyperglycemia improvement post-treatment.
Main Methods:
- Retrospective longitudinal cohort study of adult patients with endogenous CS and hyperglycemia (2000-2019).
- Assessed changes in glycated hemoglobin A1c (HbA1c), hyperglycemia therapy intensity, and overall improvement.
- Analyzed outcomes based on CS subtype and hypercortisolism severity.
Main Results:
- Following curative procedures, 21% of patients achieved hyperglycemia resolution, and 47% showed improvement.
- HbA1c levels decreased by 0.84% (P < .001), and insulin dosage reduced by 30 units (P < .001).
- Severe hypercortisolism and non-adrenal CS subtypes were associated with better hyperglycemia improvement.
Conclusions:
- Curative procedures offer significant benefits for hyperglycemia in a majority of Cushing syndrome patients.
- Close monitoring and adjustment of hyperglycemia therapy are essential during the recovery phase after CS treatment.
Context:
Hyperglycemia is a common complication of Cushing syndrome (CS).
Objective:
We aimed to determine the impact of curative procedure on hyperglycemia and its management in patients with CS.
Methods:
This retrospective longitudinal cohort study took place 2000 to 2019 in a referral center among adults with endogenous CS and hyperglycemia. Main outcome measures included glycated hemoglobin A1c (HbA1c), intensity of hyperglycemia therapy, and improvement of hyperglycemia.
Results:
In 174 patients with CS (pituitary in 106, ectopic in 25, adrenal in 43), baseline median HbA1c was 6.9% (range, 4.9-13.1), with 41 (24%) patients not on any therapy for hyperglycemia, 93 (52%) on oral medications, and 64 (37%) on insulin (median daily units of 58; range, 10-360). Following CS remission, at the end of follow-up (median 10.5 months), 37 (21%) patients demonstrated resolution of hyperglycemia, 82 (47%) demonstrated improvement, and 55 (32%) had no change or worsening in hyperglycemia. At the end of follow-up, HbA1c decreased by 0.84% (P < .001) and daily insulin dose decreased by a mean of 30 units (P < .001). Biochemical hypercortisolism severity score (severe vs moderate/mild: odds ratio [OR] of 2.4 [95% CI, 1.1-4.9]), and CS subtype (nonadrenal vs adrenal: OR of 2.9 [95% CI, 1.3-6.4]), but not type of hyperglycemia (diabetes vs prediabetes: OR of 2.1 [0.9-4.9]) were associated with hyperglycemia improvement at the end of follow-up.
Conclusion:
Two-thirds of patients with CS and hyperglycemia demonstrate resolution or improvement of hyperglycemia after a curative procedure. Close monitoring during CS recovery is needed to ensure appropriate therapy modification.
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