FARMACOLOGÍA S6-4
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The discussion delves into the effects of cortisol deficiency, particularly in individuals with adrenal destruction, and touches on diseases like Addison's.
Effects of Cortisol Deficiency
- Cortisol deficiency can lead to weakness, fatigue, vomiting, hypotension due to sodium and water retention decrease, reduced vascular reactivity, and skin pigmentation.
- Primary diseases caused by cortisol deficiency include autoimmune destruction of adrenal glands or secondary causes like tumors or surgical interventions.
- Symptoms of cortisol deficiency include fatigue, skin changes, weight loss, nausea, abdominal pain, salt cravings, and electrolyte imbalances.
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This part discusses additional symptoms and manifestations related to cortisol deficiency.
Additional Symptoms of Cortisol Deficiency
- Other symptoms may include changes in personality traits, heightened senses of taste and smell but decreased pubic hair growth in women.
- Radiographic evidence can show heart enlargement due to cortisol deficiency.
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The conversation shifts towards the chemical structure of corticosteroids and their synthesis process from cholesterol.
Chemical Structure and Synthesis Process
- Corticosteroids have a specific chemical structure with essential components for glucocorticoid activity.
- The presence of certain groups in the structure determines the type of corticosteroid activity.
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This segment explores the synthesis pathway of corticosteroids from cholesterol through various enzymatic reactions.
Synthesis Pathway
- Corticosteroids are synthesized from cholesterol via several enzymatic steps involving intermediates like pregnenolone and progesterone.
Corticosteroids Mechanism of Action and Effects
In this section, the discussion revolves around the mechanism of action of corticosteroids in inflammation and immune system regulation.
Corticosteroid Inhibitors
- Corticosteroids like ketoconazole are used in situations of inflammation or excessive immune activity.
- Trilostane inhibits the formation of 17-hydroxyprogesterone, a precursor to cortisol.
- Inhibitors like trilostane and dipyrone affect testosterone inhibition and aldosterone formation.
Effects of Synthetic Corticosteroids
This part delves into the effects and equivalencies of synthetic corticosteroids compared to natural corticosteroids.
Synthetic Corticosteroid Equivalencies
- Different synthetic corticosteroids have varying glucocorticoid and mineralocorticoid activities.
- Examples include hydrocortisone with balanced activities, prednisolone mainly glucocorticoid, and fludrocortisone mostly mineralocorticoid.
Systemic Effects of Cortisol
The systemic effects of cortisol administration via different routes are discussed here.
Systemic Effects
- Administering corticosteroids systemically leads to various effects such as increased gluconeogenesis, muscle catabolism, and immunosuppression.
- Other effects include increased lipolysis, central nervous system stimulation, and elevated blood pressure.
Actions on Carbohydrates and Fats
This segment focuses on how corticosteroids impact carbohydrate metabolism, lipid mobilization, and anti-inflammatory actions.
Impact on Metabolism
- Cortisol affects carbohydrate metabolism by increasing blood glucose levels through various mechanisms including insulin suppression.
- It also stimulates gluconeogenesis while promoting protein catabolism and fat mobilization.
Anti-Inflammatory Properties
The discussion shifts towards the anti-inflammatory properties of corticosteroids.
Anti-Inflammatory Actions
- Corticosteroids exhibit anti-inflammatory properties by reducing capillary permeability, vasodilation facilitation, lymphocyte activity suppression, and altering immunity responses locally.
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The discussion revolves around the restricted use of systemic corticosteroids in children due to their impact on growth, particularly focusing on asthmatic patients and the challenges associated with corticosteroid usage.
Corticosteroid Use in Children
- Asthmatic patients commonly use corticosteroids, but it is crucial to differentiate between systemic and inhaled corticosteroids to minimize adverse effects.
- Inhaled corticosteroids have been instrumental in addressing growth-related concerns in pediatric asthma management, especially for children aged 6 to 19 years, reducing the risk of osteoporosis and fractures.
- Prolonged and high-dose systemic corticosteroid therapy can lead to pathological fractures, aseptic necrosis of the femoral head, and other complications observed predominantly in autoimmune diseases like arthritis and lupus.
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This segment delves into the diverse physiological effects of corticosteroids on various bodily systems beyond growth concerns, emphasizing implications for surgeons and healthcare providers.
Physiological Effects of Corticosteroids
- Corticosteroids can impact lipid metabolism by sensitizing tissues to lipolytic enzymes, leading to fat redistribution that manifests as characteristic physical changes like moon facies or buffalo hump.
- Corticosteroids influence electrolyte balance by promoting sodium retention and potassium excretion, potentially causing hypokalemia, impairing vitamin D absorption, and affecting calcium homeostasis.
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This section explores cardiovascular and renal effects induced by corticosteroid therapy while highlighting strategies to mitigate these adverse outcomes through tailored medication selection.
Cardiovascular and Renal Implications
- Different types of corticosteroids vary in their cardiovascular impact; some may increase cardiac output positively while others affect muscle function negatively through mechanisms such as myopathy.
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The focus shifts towards gastrointestinal repercussions associated with corticosteroid use, particularly their ulcerogenic potential and interactions within the gastric mucosa environment.
Gastrointestinal Effects of Corticosteroids
In-depth Analysis of Corticosteroids Effects
This section delves into the immunological responses and effects of corticosteroids on various bodily functions.
Effects on Immunological Responses
- Corticosteroids decrease gastric response, affect immune system function, and impact blood components.
- They play a crucial role in autoimmune diseases, rheumatologic conditions, and allergic reactions.
Mechanism of Action
- Corticosteroids inhibit a range of inflammation mediators such as autacoids and immune cells, exerting inhibitory effects on inflammatory and immune responses.
- These medications suppress cytokines like interleukin 1 and 6, tumor necrosis factor-alpha, granulocyte colony-stimulating factors, interferon-gamma, among others.
Delayed Effects and Gene Regulation
- The effects of corticosteroids are not immediate due to their intracellular mechanism of action involving gene expression regulation.
- Their impact requires protein gene expression modulation by binding to cytoplasmic receptors that regulate genes coding for cytokines and enzymes like collagenase.