Hypothalamic-Pituitary Diseases pp 161-200 | Cite as
Physiopathology, Diagnosis, and Treatment of Functional Pituitary Dysfunction
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.
Keywords
Obesity Amenorrhea Eating disorders Thyroid Pseudo-Cushing’sList of 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
Notes
Acknowledgments
This work was supported by the Serbian Ministry of Science (project number 17503).
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