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Physiopathology, Diagnosis, and Treatment of Functional Pituitary Dysfunction

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Hypothalamic-Pituitary Diseases

Part of the book series: Endocrinology ((ENDOCR))

Abstract

Neuroendocrine signals are integrated by the hypothalamus. Both hypothalamic and peripheral hormone signals are executed in the pituitary. Functional hypothalamic-pituitary changes may develop as a result of chronic stress, energy imbalance (both positive-obesity and negative-anorexia nervosa), and critical illness. Abnormalities of the endocrine system include increased activity of hypothalamic-pituitary-adrenal axis (HPA), impaired growth hormone axis, gonadal and thyroid dysfunction, and alteration in prolactin secretion. These hormonal alterations may also contribute to the development of underlying condition. A skillful use of dynamic tests together with careful clinical evaluation and follow-up are necessary to establish the correct diagnosis. Some of these changes are viewed as adaptive, and improvement in pituitary dysfunctions is expected with reversal of causation.

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Abbreviations

ACTH:

Adrenocorticotropic hormone

AgRP:

Agouti-related-peptide

aMSH:

Alpha-melanocyte-stimulating hormone

AN:

Anorexia nervosa

ATP:

Adenosine tri-phosphate

AVP:

Arginine vasopressin

BMD:

Bone mineral density

BMI:

Body mass index

CFS:

Chronic fatigue syndrome

CRH:

Corticotropin-releasing hormone

CS:

Cushing’s syndrome

DM:

Diabetes mellitus

E2:

Estradiol

FFA:

Free fatty acids

FGF-21:

Fibroblast growth factor-21

FHA:

Functional hypothalamic amenorrhea

FM:

Fibromyalgia

FSH:

Follicle-stimulating hormone

fT3:

Free tri-iodothyronine

fT4:

Free thyroxine

GC:

Glucocorticoid

GH:

Growth hormone

GHD:

Growth hormone deficiency

GHRH:

Growth hormone releasing hormone

GnRH:

Gonadotropin-releasing hormone

GR:

Glucocorticoid receptors

HPA:

Hypothalamo-pituitary-adrenal axis

HPG:

Hypothalamo-pituitary-gonadal axis

HPO:

Hypothalamo-pituitary-ovary

HPT:

Hypothalamo-pituitary-thyroid

ICU:

Intensive care unit

IGF-1:

Insulin-like growth factor 1

IGFBP:

Insulin-like growth hormone binding protein

IHH:

Idiopathic hypogonadotropic hypogonadism

IL:

Interleukin

ITT:

Insulin tolerance test

LH:

Luteinizing hormone

MCH:

Melanine-concentrating hormone

MR:

Mineralocorticoid receptors

MRI:

Magnetic resonance imaging

NEFA:

Non-esterified fatty acids

NPY:

Neuropeptide Y

NTIS:

Non-thyroidal illness syndrome

OSAS:

Obstructive sleep apnea syndrome

PCOS:

Polycystic ovary syndrome

PCS:

Pseudo- Cushing`s syndrome

PRL:

Prolactin

PTSD:

Posttraumatic stress disorder

RAI:

Relative adrenal insufficiency

rT3:

Reverse tri-iodothyronine

SHBG:

Sex hormone binding globulin

T3 :

Tri-iodothyronine

T4:

Thyroxine

TNFa:

Tumor necrosis factor alpha

TRH:

Thyrotropin-releasing hormone

TSH:

Thyroid-stimulating hormone

UFC:

Urinary free cortisol

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Acknowledgments

This work was supported by the Serbian Ministry of Science (project number 17503).

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Miljic, D., Pekic, S., Stojanovic, M., Popovic, V. (2018). Physiopathology, Diagnosis, and Treatment of Functional Pituitary Dysfunction. In: Casanueva, F., Ghigo, E. (eds) Hypothalamic-Pituitary Diseases. Endocrinology. Springer, Cham. https://doi.org/10.1007/978-3-319-38681-2_6-1

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