Active clinical trials for "Dwarfism, Pituitary"

This is an exploratory trial with four cross-over arms measuring the pharmacokinetic and pharmacodynamic profiles of growth hormone using two different modes of growth hormone administration (subcutaneous infusion into the abdomen or subcutaneous bolus injection in the thigh) in 8 adult male or female patients with growth hormone deficiency during interval exercise or in supine rest. The order of dosing regimen within the groups and between the groups will be randomised. All patients will go through four different treatment sessions:A/B Single subcutaneous bolus injection, supine rest without/with interval exercise, sessions C/D: Continuous subcutaneous infusion, supine rest without/with interval exercise. Hypotheses: 1) There is day-to-day variation of exogenous growth hormone, 2)Concentration of growth hormone decreases due to exercise compared to supine rest, 3)There is a circadian variation in pharmacokinetics of exogenous growth hormone infused subcutaneously

This trial is conducted in Europe. Growth Hormone in young adults with growth hormone deficiency in childhood. This trial compares a treated group of patients with an untreated group of patients.

This study will determine whether adding more calories to the diet helps boys with growth problems grow better while being treated with Nutropin, a growth hormone that is used to help children grow taller. The Food and Drug Administration has approved Nutropin for use in children who are very short. This study will examine whether giving nutritional supplements in addition to Nutropin can help children grow better than with Nutropin alone. Boys between 7 and 10 years of age who are very short and below average in weight, but are otherwise healthy may be eligible for this study. Candidates must qualify for Nutropin treatments to boost their growth. Boys will be recruited for the study from the Nemours Children's Clinic in Jacksonville, FL, and from the National Institutes of Health in Bethesda, MD. Participants are randomly assigned to one of two treatment groups. One group is observed for 6 months and then receives a Nutropin injection every day for 12 months. The second group drinks 8 ounces of a high-calorie beverage called Pediasure every day for 6 months and then receives Nutropin plus Pediasure every day for 12 months. In addition to treatment, participants undergo the following tests and procedures at the schedule indicated: Baseline, 3, 6, 9, 12, 15 and 18 months Clinical examination Height measurement Body composition assessment: Skin-fold thickness calipers are used in four places on the body to estimate body fat Bioelectric impedance: A small amount of electrical current is used to calculate the percentage of body fat. Baseline, 6, 12, and 18 months Blood tests Bone age x-ray: x-ray of the left hand to measure growth potential DEXA (dual energy x-ray absorptiometry) scan: x-ray scan to measure body fat, muscle, and bone mineral content. The subject lies on a flat table during the scan. Baseline, 6, and 12 months Record of dietary intake: Parents are asked to write down everything the child eats and drinks for 3 days. Using this record, a dietitian calculates the daily caloric intake. Total energy expenditure: This test determines how much energy the child uses. For the test, the child drinks water labeled with harmless isotopes (heavy oxygen and heavy hydrogen). For the next 10 days he collects urine in plastic tubes at home. At the end of the 10 days, the parents bring the urine to the clinic for analysis to determine how fast the labeled water leaves the body. This information is used to calculate how much energy the child expends each day. Participants' weight is measured at 2 and 4 weeks, and then monthly for the remainder of the 18-month study.

The purpose of this study is to evaluate the pharmacokinetics of Syntropin (a human growth hormone) and to determine the serum concentration of IGF-1 after Syntropin injection.

To assess the predictive value of the short term IGF-1 stimulation test, based on IGF-1 changes, on the 24 months growth response to 2 different doses of GH in patients with conventional GH deficiency.

This protocol will assess the cardiovascular risk associated with growth hormone deficiency in adults. We will use multiple modalities to assess risk for heart attacks or strokes including blood work, ultrasound, MRI and endothelial cell biopsies in both patients who are growth hormone deficient and in patients with normal growth hormone secretion. We hypothesize that adults with growth hormone deficiency will have results suggestive of an increased risk for cardiovascular disease.

Approximately 50% of middle-aged patients with severe AGHD have a normal age-related serum IGF-I. It remains unclear if in these individuals serum IGF-I is GH dependent or independent. This study compared the relationship between GH and serum IGF-I in two cohorts of male patients with severe AGHD; one with normal and the other with subnormal age-related serum IGF-I values. The GH receptor antagonist - pegvisomant was be used to specifically inhibit GH action and the changes in markers of the GH axis, such as serum IGF-I, IGFBP-3, GH and GHBP were measured.

Data about the impact of growth hormone treatment on insulin sensitivity in children are quite controversial, due to the different surrogate indexes that have been used, like Homa-IR, QUICKI, ISI-Matsuda or adipokine levels. The investigators aimed to evaluate insulin sensitivity through the euglycemic hyperinsulinemic clamp, considered the gold standard technique, in children affected by growth hormone deficiency and to compare the M-value with the most commonly used surrogate indexes of insulin sensitivity.

The purpose of this study is to find out if the Glucagon Stimulation Test (GST) is a reliable alternative to the Insulin Tolerance Test (ITT) for diagnosis of Growth Hormone Deficiency (GHD) and adrenal insufficiency. In some patients the accuracy of the GST for evaluation of adrenal insufficiency is compared to the adrenocorticotropin hormone (ACTH ) stimulation test.

The Macimorelin Growth Hormone Stimulation Test (GHST) will be compared with the Insulin Tolerance Test (ITT) in an open-label, randomized, 2-way crossover Trial. The trial will include subjects suspected to have adult growth hormone deficiency (AGHD) and a group of healthy control subjects.