Primary hypoparathyroidism is a condition characterized by hypocalcemia and hyperphosphatemia resulting from the primary absence or deficiency of parathyroid hormone (PTH) or from the secretion of biologically inactive PTH. Continue reading
Diabetes insipidus is a disease in which large volumes of dilute urine (polyuria) are excreted due to vasopressin (AVP) deficiency [central diabetes insipidus (CDI)], AVP resistance [nephrogenic diabetes insipidus (NDI)], or excessive water intake (primary polydipsia). Polyuria is characterized by a urine volume in excess of 2 l/m2/24 h or approximately 150 ml/kg/24 h at birth, 100–110 ml/kg/24 h until the age of 2 years and 40–50 ml/kg/24 h in the older child and adult. Continue reading
In overt hyperthyroidism, serum levels of free T4 and triiodothyronine (T3) or levels of T3 alone are elevated, and serum thyrotropin (TSH) levels are suppressed. In subclinical hyperthyroidism, levels of free T4 and T3 are normal, thyrotropin levels are suppressed, and thyroid hormone levels are usually in the middle to upper range of normal. Continue reading
The updated American College of Cardiology/American Heart Association (ACC/AHA) Guideline on the Treatment of Blood Cholesterol (GTBC) has been long-awaited since the latest update of the Adult Treatment Panel III (ATP III) guidelines in 2004. The updated GTBC recommends a significant paradigm shift in lipid-loweringdrug therapy for atherosclerotic cardiovascular disease (ASCVD) risk reduction, which has led to questions regarding their content and their implementation.
Paget’s disease of bone (also known as osteitis deformans) is a nonmalignant disease involving accelerated bone resorption followed by deposition of dense, chaotic, and ineffectively mineralized bone matrix.
As defined by the American Thyroid Association’s task force on the management of thyroid nodules and differentiated thyroid cancer, a thyroid nodule is a discrete lesion within the thyroid gland that is radiologically distinct from the surrounding thyroid parenchyma.
The finding of hypercalcemia on routine biochemical testing or in the evaluation of postmenopausal women with osteoporosis is typically the initial clue to the diagnosis of primary hyperparathyroidism. The total serum calcium level, which combines both the free and albumin-bound components of circulating calcium, should be adjusted for the level of albumin. Measurement of ionized calcium may be useful in selected cases, such as in patients with hyperalbuminemia, thrombocytosis, Waldenström’s macroglobulinemia, and myeloma; these patients may have elevated levels of total serum calcium, but normal levels of ionized serum calcium (artifactual hypercalcemia).
Clinical hyperthyroidism, also called thyrotoxicosis, is caused by the effects of excess thyroid hormone and can be triggered by different disorders. Etiologic diagnosis influences prognosis and therapy.
The evaluation of patients with suspected Cushing’s syndrome (CS) is complex and expensive, and the diagnosis is often a challenge for clinicians. Most patients initially suspected of having CS will not have this condition, and therefore efficient screening procedures are needed to identify the few patients who will need additional investigation in specialized centers.
In contrast to macroadenomas, for which therapy is routinely indicated, microadenomas do not always require treatment. For patients with microadenomas who do not have these indications, symptoms and prolactin levels can be monitored, and MRI can be used to follow the size of the tumor.