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The Pituitary Gland

The Pituitary Gland

The pituitary is a small endocrine organ in the sphenoid bone under the hypothalamus. Primarily, the pituitary in adults has two distinct anatomical and functional regions— the anterior and posterior lobes. During human fetal development, a third pituitary gland region called the pars intermedia atrophies and disappears. However, some of its cells migrate and exist adjacent to the anterior pituitary in adults.

Major Hormones and Their Functions

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.

Hyperthyroidism I: Introduction

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

Hypothyroidism II: Pathophysiology

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

Cushing Syndrome II: Pathophysiology

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

Hypoglycemia

Hypoglycemia

Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...

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Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis

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Published on: December 17, 2010

El hipotituitarismo es el hipotituitarismo.

Harald Jörn Schneider¹, Gianluca Aimaretti², Ilonka Kreitschmann-Andermahr³

¹Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Turin, Turin, Italy; Clinical Neuroendocrinology Group, Max Planck Institute of Psychiatry, Munich, Germany.

Lancet (London, England)

|May 1, 2007

Resumen

El hipopituitarismo, una afección que afecta la función de la glándula pituitaria, es más común de lo que se pensaba, especialmente en pacientes con lesiones cerebrales. El reconocimiento temprano por parte de los médicos generales es crucial para el diagnóstico y la gestión oportunos.

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Área de la Ciencia:

Endocrinología Endocrinología.
Neurología Neurología.

Sus antecedentes:

El hipopituitarismo se caracteriza por síntomas inespecíficos, pero puede provocar graves consecuencias para la salud y un aumento de la mortalidad.
El diagnóstico preciso se basa en pruebas de estimulación para las deficiencias de hormona del crecimiento y corticotropina, junto con los niveles basales de hormonas y la evaluación clínica.

Objetivo del estudio:

Para resaltar la prevalencia poco reconocida de hipopituitarismo, particularmente en pacientes con daño cerebral.
Para enfatizar la necesidad de que los médicos generales reconozcan el hipopituitarismo como una condición no rara.

Principales métodos:

Revisión de los criterios de diagnóstico actuales para el hipopituitarismo.
Análisis de la incidencia y prevalencia del hipopituitarismo.
Examen de la asociación entre lesiones cerebrales y hipopituitarismo.

Principales resultados:

Las tasas estimadas de incidencia y prevalencia de hipopituitarismo son de 4,2 por cada 100.000 personas al año y 45,5 por cada 100.000, respectivamente.
Los pacientes con lesión cerebral traumática o hemorragia subaracnoidea se enfrentan a un alto riesgo de desarrollar hipopituitarismo.
La verdadera prevalencia de hipopituitarismo es probablemente más alta de lo que sugieren las estimaciones actuales.

Conclusiones:

El hipopituitarismo no es una enfermedad rara y requiere un mayor reconocimiento por parte de los médicos generales.
Los avances en la terapia de reemplazo hormonal ofrecen opciones de tratamiento convenientes y fisiológicas.
El diagnóstico y el tratamiento rápidos del hipopituitarismo son esenciales para prevenir eventos que amenazan la vida.