Oral Magnesium Pidolate, Hemoglobin SC Disease, MG Pidolate
|First Received Date ICMJE||June 26, 2002|
|Last Updated Date||November 15, 2012|
|Start Date ICMJE||January 2001|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||Evaluation of whether treatment with oral Mg pidolate decreases the number of painful crises. [ Time Frame: 64 weeks ] [ Designated as safety issue: No ]
The difference in frequency of painful episodes between the 2 treatment modalities will be calculated for each patient. The goal is to decrease the frequency of painful episodes by at least 50%.
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT00040456 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Oral Magnesium Pidolate, Hemoglobin SC Disease, MG Pidolate|
|Official Title ICMJE||The Effect of Oral Magnesium Pidolate on Incidence of Painful Crises in Patients With Hemoglobin SC Disease|
Subjects have a form of sickle cell disease, called hemoglobin SC disease. This results in abnormally shaped red blood cells that get 'stuck' in blood vessels and then results in episodes of severe pain (pain crises). Patients with the more common form of sickle cell disease, called hemoglobin SS disease, also suffer from pain crises. Treatment with the drug hydroxyurea is available to help prevent the pain crises in hemoglobin SS disease, but there is no good treatment to help prevent the pain crises in hemoglobin SC disease.
It has been shown that one of the reasons for the formation of the abnormally shaped red blood cells in patients with SC disease is the fact that these cells do not contain enough water; they are dehydrated. Drinking more water will not increase the amount of water in the cells. Certain salts and minerals can however have an effect on the amount of water in the red blood cells. One of the most important minerals influencing this is called magnesium. Magnesium is present in food and also in certain medications used to treat heartburn. Magnesium has been used successfully both in animals and people to increase the amount of water in the red blood cells and is very well tolerated by most people.
Investigators are using a new form of magnesium known as magnesium pidolate because this form of magnesium may help with the symptoms of disease without causing diarrhea (a common side effect of magnesium products).
Purpose The purpose of this study is to find out whether treatment with magnesium pidolate will increase the amount of water in the red blood cell and result in fewer painful crises in patients with hemoglobin SC disease while not causing diarrhea.
The study will last for about 64 weeks (about 16 months).
This is a placebo-controlled study which means that the effectiveness of the magnesium medication (the chemical form of which is known as Mg pidolate) will be compared to placebo. A placebo looks like the drug that is being studied (in this case magnesium) but does not contain any active drug of any kind. Comparing magnesium with placebo will help decide whether magnesium is better than treatment with placebo.
The study lasts for 64 weeks (about 16 months) and is divided into 2 parts, each part lasting for 32 weeks (8 months). During the first part study medication (magnesium or placebo) will be taken twice daily for 24 weeks (about 6 months), followed by no study medication for 8 weeks. These 8 weeks are called a washout period, during which time the effects of the study medication are 'washed-out' of the body. After the washout 8 weeks, patients will enter the second part of the study. During this second part, the study medication (magnesium or placebo) will again be taken twice daily for 24 weeks. During the second part of the study participants will receive whichever study medication that was not taken during the first part of the study. Following the second 24 weeks, there will be an observation period of 8 weeks (during which time no study medication is taken). The study is completed at the end of the 8-week observation period. Participants will take magnesium for 24 weeks and placebo for 24 weeks. The decision whether participants will receive magnesium or placebo first will be made randomly by a computer. This is a double-blind study which means that neither the participant nor the study doctor will know which study medication is taking during each part of the study. However, the study may be unblinded for safety issues if necessary.
If the participant responds to the study medication, it can be continued after completion of the 24 weeks.
The study medication is in the form of a liquid, taken two times a day (morning and evening) with the actual amount taken depending on the participant's weight.
During this study the participant will be seen in clinic on a regular basis; initially every 2 weeks, later once a month. There will be a total of 21 clinic visits during the study. Three of these are clinic visits that would normally take place in the routine management of this disease. The other 18 visits are required for this study. At each visit participants will have blood tests to measure the amount of magnesium in the blood, especially the red blood cells, but also to look for any other changes that might occur. The total amount of blood collected during the 16 month study is 120 ml (24 teaspoons), which is a safe amount. Three ml (half teaspoon) will be drawn at 13 visits, 5ml (1 teaspoon) at 4 visits, and 15ml (3 teaspoons) at a further 4 visits. At 4 of the clinic visits a urine test will be performed.
During the study participants will be asked to keep a record of all episodes of pain, or any other changes that are noticed, in the form of a diary.
|Study Type ICMJE||Interventional|
|Study Phase||Phase 2|
|Study Design ICMJE||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Treatment
|Condition ICMJE||HEMOGLOBIN SC DISEASE|
|Study Arm (s)||
|Publications *||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Terminated|
|Completion Date||May 2006|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
This protocol is open to male and female patients of all races with a diagnosis of severe sickle hemoglobinopathy providing they also satisfy the following eligibility criteria:
|Accepts Healthy Volunteers||No|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT00040456|
|Other Study ID Numbers ICMJE||H9251 MG Pidolate, MG Pidolate|
|Has Data Monitoring Committee||Yes|
|Responsible Party||Brigitta Mueller, Baylor College of Medicine|
|Study Sponsor ICMJE||Baylor College of Medicine|
|Information Provided By||Baylor College of Medicine|
|Verification Date||November 2012|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP