Diagnostic Test For Endocrine System Ppt

[Roman Bayramdurdiyev]

Weknow it can be alarming to learn that you have an endocrine disorder, but most can be treated with medications, surgery or other approaches. Any time you have questions or concerns about your hormonal health, your Mercy physicians are ready to help. Mercy offers the following types of tests to diagnose endocrine disorders.

The hormone cortisol helps your body handle physical stress from illness, injury or another cause. Both your pituitary glands and adrenal glands help produce cortisol. Mercy doctors use a cortisol blood test to measure the amount of cortisol in your blood and help diagnose potential problems with these glands.

Prolactin is a hormone made by your pituitary gland that helps regulate reproductive functions in both women and men. Prolactin disorders can lead to infertility, erectile dysfunction and other issues. If you have symptoms of a prolactin disorder, your doctor may order a prolactin blood test to check your hormone levels.

The endocrine system is a network of glands that produce and release hormones. These hormones help control many important body functions, including the body's ability to change calories into energy that powers cells and organs. The endocrine system affects how your heart beats, how your bones and tissues grow, and even your ability to make a baby.

Disorders of the endocrine system happen if your hormone levels are too high or too low, or if your body doesn't respond to hormones in the expected way. You may develop diabetes, thyroid disease, growth disorders, sexual dysfunction, and a host of other hormone-related disorders.

The endocrine feedback system helps control the balance of hormones in the bloodstream. If your body has too much or too little of a certain hormone, the feedback system signals the proper gland or glands to correct the problem. A hormone imbalance may occur if this feedback system has trouble keeping the right level of hormones in the bloodstream, or if your body doesn't clear them out of the bloodstream properly.

Most endocrine tumors and nodules (lumps) are noncancerous. They usually don't spread to other parts of the body. However, a tumor or nodule on the gland may interfere with the gland's hormone production.

The symptoms of an endocrine disorder vary widely and depend on the specific gland involved. However, most people with endocrine disease complain of fatigue and weakness. Certain symptoms may make you think you have a different disease or disorder. Some symptoms that are worth talking to your doctor about include:

Adrenal insufficiency. The adrenal gland releases too little of the hormone cortisol and sometimes, aldosterone. Symptoms include fatigue, stomach upset, dehydration, and skin changes. Addison's disease is a type of adrenal insufficiency.

Cushing's disease. The overproduction of a pituitary gland hormone leads to an overactive adrenal gland. A similar condition called Cushing's syndrome may occur in people, particularly children, who take high doses of corticosteroid medications.

Hyperthyroidism. The thyroid gland produces too much thyroid hormone, leading to weight loss, fast heart rate, sweating, and nervousness. The most common cause for an overactive thyroid is an autoimmune disorder called Grave's disease.

Hypothyroidism. The thyroid gland does not produce enough thyroid hormone, leading to fatigue, constipation, dry skin, and depression. The underactive gland can cause slowed development in children. Some types of hypothyroidism are present at birth.

Hypopituitarism. In this condition, the pituitary gland releases little or no hormones. It may be caused by several different diseases. Women with this condition may stop getting their periods.

Multiple endocrine neoplasia type 1 and 2 (MEN1 and MEN2). These rare, genetic conditions are passed down through families. They cause tumors of the parathyroid, adrenal, and thyroid glands, leading to overproduction of hormones.

Polycystic ovary syndrome (PCOS). The overproduction of androgens interferes with the development of eggs and their release from the female ovaries. PCOS is a leading cause of infertility.

Treatment of endocrine disorders can be complicated, as a change in one hormone level can throw off another. Your doctor or specialist may order routine blood work to check for problems or to determine if your medication or treatment plan needs to be adjusted.

Your endocrine system releases hormones that affect how your body develops and functions. An endocrine system malfunction, caused by genetics, infection, or other factors, can result in various disorders such as diabetes, hyperthyroidism, and polycystic ovarian syndrome (PCOS). If you have fatigue or weakness regularly, it could be a sign of an endocrine disorder, so consult your doctor so that they can diagnose and treat your condition.

In addition, AVP-induced TBW expansion translates into plasma-solute dilution leading to hyponatremia. Thereby, plasma osmolality (OSM) is decreased given the fact that sodium strongly determines OSM according to the following equation:

Besides AVP actions on OSM, AVP also enhances endothelial-cell synthesis and the release of von-Willebrand Factor, thereby affecting hemostasis (4). This AVP effect on hemostasis is therapeutically used in bleeding disorders involving Factor VIII or von-Willebrand factor deficiency (5, 6).

SIADH may be viewed as a primary central-nervous system dysregulation of OSM and/or thirst. The etiology still is incompletely understood. Alternatively, SIADH may relate to baroreceptor unloading due to clinically inapparent hypovolemia or, hypothetically, to carotid-artery atherosclerosis affecting baroreflex regulation (7). This alternative route of increased AVP release may ultimately translate into the clinical picture of SIADH. Generally, less wall distension of the carotid arterial walls and/or the aortic arch may lead to a decrease of arterial baroreceptor-related afferent autonomic nerve traffic to the rostral ventrolateral medulla and nucleus tractus solitarii (NTS) translating into less sympathoinhibition (sympathoexcitation) and to an increased release of AVP (8) (Figure 2).

Baroreflex regulation and SIADH: arterial hypotension lowers baroreflex-mediated afferent nerve traffic to the nucleus tractus solitarii leading to an elevated efferent sympathetic nerve activity and increased AVP release.

Lastly, hypovolemia-related cardiopulmonary (CP) reflex deactivation mediated by less wall distension of the right atrial wall and pulmonary veins may increase plasma AVP leading to SIADH (9, 10). Conversely, CP reflex activation mediated by more right-atrial wall distension e.g. after body immersion in water is able to decrease plasma AVP (11).

Both moderate and especially severe hyponatremia (Na Clearly, symptoms of hyponatremia depend on the time elapsed since the start of hyponatremia development. Hyponatremia developing in less than 48 hours may already present with severe symptoms which are mainly caused by cerebral edema and a high intracranial pressure. These include epileptic convulsions, a pronounced somnolence or coma, vomiting and/or a compromised respiratory regulation. Symptoms like headache or modest nausea generally reflect a rather moderate severity.

In patients with acute hyponatremia, a brief patient history and a physical examination should be performed (Table 1). In cases of a rather slowly developing or chronic hyponatremia, intracellular regulations such as decreased uptake of taurin aim to adapt to the decreased extracellular osmolality. Therefore, those patients may show very subtle or even no clinical alterations. Taurin is an endogenous amino acid that mediates cellular adaptation to hyperosmotic stress (15).

As an important step in the approach to the hyponatremic patient is to determine volume status. Accordingly, a state of overhydration characterized by the presence of peripheral edema needs to be ruled out. Hyponatremia accompanied by peripheral edema, anasarca, jugular vein distension in absence of a significant tricuspid-valve regurgitation, dyspnea, and/or signs of a lung fluid or pulmonary edema on the chest radiograph are not consistent with the diagnosis of SIADH. Here, underlying diseases such as chronic heart failure should be diagnosed and addressed. Likewise, hyponatremia in a state of hypovolemia needs to be excluded. In exsiccosis, e.g., due to diuretics, both water and solutes may be lost. Hypovolemia triggers sympathoactivation via CP and baroreflex leading to an appropriate ADH release.

As a diagnostic cornerstone of SIADH diagnosis, determination of fractional uric-acid excretion has recently emerged (SIADH increased). Fenske et al. (19) confirmed earlier reports demonstrating fractional uric-acid excretion (cut-off greater than 12%) to rule out hyponatremic states with reduced extracellular fluid volume, e.g. due to diuretics (Figure 4).

There is sometimes debate on whether measurements of AVP in the plasma are helpful or not for diagnosis of SIADH or other hyponatremic circumstances. There are, however; multiple obstacles rendering AVP determination and interpretation difficult. Only a few laboratories provide tests with good sensitivity, since AVP is very unstable when isolated from plasma and binds to other structures. A potential alternative is the more stable copeptin, also called C-terminal proarginine vasopressin, which is generated by enzymatic cleavage of the vasopressin prohormone. Strikingly, SIADH patients were shown to have an elevated plasma copeptin (20). As an additional way to diagnose SIADH, correlation of plasma copeptin with changes in plasma osmolality (step 2, step 3) can be used (21). Furthermore, a hypertonic (3%) saline test has been proposed for SIADH (20). However, this test strategy still needs to be validated.

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