open access

Vol 45, No 4 (2011)
ARTYKUŁ ORYGINALNY
Submitted: 2010-12-14
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The impact of transsphenoidal surgery on glucose homeostasis and insulin resistance in acromegaly

Maria Stelmachowska-Banaś, Grzegorz Zieliński, Piotr Zdunowski, Jan Podgórski, Wojciech Zgliczyński
DOI: 10.1016/S0028-3843(14)60103-1
·
Neurol Neurochir Pol 2011;45(4):328-334.

open access

Vol 45, No 4 (2011)
ARTYKUŁ ORYGINALNY
Submitted: 2010-12-14

Abstract

Background and purpose

Impaired glucose tolerance and overt diabetes mellitus are frequently associated with acromegaly. The aim of this study was to find out whether these alterations could be reversed after transsphenoidal surgery.

Material and methods

Two hundred and thirty-nine acromegalic patients were studied before and 6–12 months after transsphenoidal surgery. Diagnosis of active acromegaly was established on the basis of widely recognized criteria. In each patient, glucose and insulin concentrations were assessed during the 75 g oral glucose tolerance test (OGTT). To estimate insulin resistance, we used homeostasis model assessment (HOMA-IR) and the quantitative insulin sensitivity check index (QUICKI).

Results

At the moment of diagnosis, diabetes mellitus was present in 25% of the acromegalic patients. After surgery, the prevalence of diabetes mellitus normalized to the level present in the general Polish population. We found a statistically significant reduction after surgery in plasma glucose levels both fasting (89.45 ± 13.92 mg/dL vs. 99.12 ± 17.33 mg/dL, p < 0.001) and during OGTT. Similarly, a prominent reduction in insulin secretion was found after surgery compared to the moment of diagnosis (15.44 ± 8.80 mIU/mL vs. 23.40 ± 10.24 mIU/mL, p < 0.001). After transsphenoidal surgery, there was a significant reduction in HOMA-IR (3.08 vs. 6.76, p < 0.0001) and a significant increase in QUICKI (0.32 vs. 0.29, p < 0.001). There were no statistically significant differences after surgery in fasting glucose and insulin levels between patients with controlled and inadequately controlled disease.

Conclusions

We conclude that in acromegalic patients glucose homeostasis alterations and insulin sensitivity can be normalized after transsphenoidal surgery, even if strict biochemical cure criteria are not fulfilled.

Abstract

Background and purpose

Impaired glucose tolerance and overt diabetes mellitus are frequently associated with acromegaly. The aim of this study was to find out whether these alterations could be reversed after transsphenoidal surgery.

Material and methods

Two hundred and thirty-nine acromegalic patients were studied before and 6–12 months after transsphenoidal surgery. Diagnosis of active acromegaly was established on the basis of widely recognized criteria. In each patient, glucose and insulin concentrations were assessed during the 75 g oral glucose tolerance test (OGTT). To estimate insulin resistance, we used homeostasis model assessment (HOMA-IR) and the quantitative insulin sensitivity check index (QUICKI).

Results

At the moment of diagnosis, diabetes mellitus was present in 25% of the acromegalic patients. After surgery, the prevalence of diabetes mellitus normalized to the level present in the general Polish population. We found a statistically significant reduction after surgery in plasma glucose levels both fasting (89.45 ± 13.92 mg/dL vs. 99.12 ± 17.33 mg/dL, p < 0.001) and during OGTT. Similarly, a prominent reduction in insulin secretion was found after surgery compared to the moment of diagnosis (15.44 ± 8.80 mIU/mL vs. 23.40 ± 10.24 mIU/mL, p < 0.001). After transsphenoidal surgery, there was a significant reduction in HOMA-IR (3.08 vs. 6.76, p < 0.0001) and a significant increase in QUICKI (0.32 vs. 0.29, p < 0.001). There were no statistically significant differences after surgery in fasting glucose and insulin levels between patients with controlled and inadequately controlled disease.

Conclusions

We conclude that in acromegalic patients glucose homeostasis alterations and insulin sensitivity can be normalized after transsphenoidal surgery, even if strict biochemical cure criteria are not fulfilled.

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Keywords

acromegaly, insulin resistance, impaired fasting glucose, impaired glucose tolerance, diabetes mellitus, transsphenoidal surgery

About this article
Title

The impact of transsphenoidal surgery on glucose homeostasis and insulin resistance in acromegaly

Journal

Neurologia i Neurochirurgia Polska

Issue

Vol 45, No 4 (2011)

Pages

328-334

DOI

10.1016/S0028-3843(14)60103-1

Bibliographic record

Neurol Neurochir Pol 2011;45(4):328-334.

Keywords

acromegaly
insulin resistance
impaired fasting glucose
impaired glucose tolerance
diabetes mellitus
transsphenoidal surgery

Authors

Maria Stelmachowska-Banaś
Grzegorz Zieliński
Piotr Zdunowski
Jan Podgórski
Wojciech Zgliczyński

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