Volume 66, Issue 5 pp. 619-625

N-terminal pro-B-type natriuretic peptide in patients with growth hormone disturbances

Mikkel Andreassen

Mikkel Andreassen

Department of Endocrinology and Internal Medicine J106, Copenhagen University Hospital Herlev, Denmark

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Jens Faber

Jens Faber

Department of Endocrinology and Internal Medicine J106, Copenhagen University Hospital Herlev, Denmark

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Henrik Vestergaard

Henrik Vestergaard

Department of Endocrinology and Internal Medicine J106, Copenhagen University Hospital Herlev, Denmark

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Caroline Kistorp

Caroline Kistorp

Department of Endocrinology and Internal Medicine J106, Copenhagen University Hospital Herlev, Denmark

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Lars Østergaard Kristensen

Lars Østergaard Kristensen

Department of Endocrinology and Internal Medicine J106, Copenhagen University Hospital Herlev, Denmark

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First published: 13 February 2007
Citations: 11
Mikkel Andreassen, Endocrine Laboratory 54o4, KAS Herlev, Herlev ringvej 75, 2730 Herlev, Denmark. Tel.: + 45 44883420; Fax: + 4544884838; E-mail: [email protected]

Summary

Background Acromegaly is associated with hypertrophic cardiomyopathy, hypertension and subsequent congestive heart failure. Impairment of cardiac function has also been associated with growth hormone deficiency (GHD). B-type natriuretic peptides (BNPs) have emerged as strong diagnostic and prognostic risk markers. They are cardioprotective hormones that compensate heart disease by promoting natriuresis and modulation of cardiac hypertrophy in response to volume expansion and ventricular wall stretch.

Objective To investigate N-terminal pro-BNP (NT-proBNP) in patients with GH disturbances before and after treatment, and in healthy gender- and age-matched controls.

Subjects and methods Ten acromegalic patients (age 48 ± 12 years) and 10 patients with GHD (age 41 ± 14 years) were studied. None had symptoms or signs of cardiovascular disease except for hypertension. Serum NT-proBNP was measured before and 3, 6, 12 and 24 months after treatment.

Results Baseline NT-proBNP was lower in acromegalic patients [median (interquartile range) 24·3 (17·8–33·0) pg/ml] than in 20 healthy matched controls [57·9 (35·4–92·2) pg/ml; P < 0·001]. NT-proBNP increased during treatment (P = 0·002), concomitant with a decrease in IGF-I (P < 0·001). After 3 months of treatment NT-proBNP peaked, with a fourfold increase to 96·4 (57·8–113·2) pg/ml. NT-proBNP did not differ in patients with GHD compared with controls (P = 0·19), and did not change during treatment (P = 0·39).

Conclusion Untreated patients with acromegaly had low NT-proBNP levels that increased fourfold after treatment. This is in contrast to other conditions with cardiac hypertrophy. Further studies are required to determine the significance of this novel finding in relation to acromegalic cardiac disease.

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