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T2* in Transfusion Dependant Anemia, MI, LVF, Normal Patients

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ClinicalTrials.gov Identifier: NCT00520559
Recruitment Status : Completed
First Posted : August 24, 2007
Last Update Posted : April 16, 2019
Information provided by:
Imperial College London

Tracking Information
First Submitted Date August 23, 2007
First Posted Date August 24, 2007
Last Update Posted Date April 16, 2019
Study Start Date January 2007
Primary Completion Date Not Provided
Current Primary Outcome Measures Not Provided
Original Primary Outcome Measures Not Provided
Change History
Current Secondary Outcome Measures Not Provided
Original Secondary Outcome Measures Not Provided
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title T2* in Transfusion Dependant Anemia, MI, LVF, Normal Patients
Official Title Incidence of Cardiac Complications in Patients With Cardiac Siderosis During 1 Year Follow-up and the Normal T2* Ranges in LVF, MI and Normal Population.
Brief Summary The purpose of this study is to provide accurate prognostic data linking cardiac complications to myocardial T2* values (A measure of iron levels in the heart using MRI)in patients predisposed to heart iron overload.
Detailed Description

Key Definitions Myocardial siderosis - Iron deposition that occurs in the heart, usually in relation to recurrent blood transfusions and red cell breakdown.

Thalassaemia - A hereditary form of anaemia leading to recurrent blood transfusions and iron overload.

Cardiomyopathy - Disease of the heart leading to heart failure. In the case of cardiac siderosis it is entirely reversible.

Chelation - Drug used to remove iron from the heart T2* CMR - Cardiac Magnetic Resonance Imaging. A specialised scan that uses a large magnet to image the heart. As iron has magnetic properties we can use this scan to determine the amount of iron within the heart. T2* is a value that relates to the level of iron loading in the heart. A T2* of less than 10 relates to severe heart iron loading, a T2* of 10-20 relates to mild/moderate heart iron loading and a T2* of greater than 20 relates to no significant iron loading in the heart.

Heart failure - Disease in which the myocardium (heart muscle) weakens and can not pump blood efficiently. Fluid accumulates in the lungs, hands, ankles, or other parts of the body. The mortality from heart failure is very high.

Heterozygotes - An individual with one normal and one abnormal thalassaemia gene. They are carriers of the thalassaemia gene with milder clinical manifestations.

Homozygotes - An individual who has inherited both abnormal thalassaemia genes producing a more severe form of the disease.

Question Response Although a rare disease in the UK, thalassaemia is the commonest genetic disorder worldwide, with approximately 94 million heterozygotes for beta thalassaemia and 60,000 homozygotes born each year.

In the United Kingdom, despite relatively easy access to healthcare, approximately 50% of patients with thalassaemia major die before reaching the age of thirty five. Of those deaths, over 60% are a result of heart failure. The cardiomyopathy is reversible if chelation is commenced early but diagnosis is often delayed due to the late onset of symptoms and measurable LV dysfunction.

This study will provide strong evidence that a myocardial T2* <10ms represents a high risk of developing cardiac complications. Derived risk ratios will provide sound guidance as to when life saving chelation is required.

A database will be produced containing clinical data and T2* values on 665 thalassaemia patients from 1998-2006.

A diagnosis of heart failure will be made if the patient has had an ejection fraction of less than 55% (measured by CMR or echocardiography) and symptoms as per NHYA classification within 1 year of their CMR scan.

A diagnosis of arrhythmia was made if the patient had documented ECG evidence within 1 year of their CMR scan.

This information will be gathered retrospectively by access to outpatient clinic letters, hospital notes, CMR/ echo reports and clinical details recorded in a proforma at the time of the CMR scan. Some of the clinical data would be obtained from other hospitals.

Patient scans will only be used if between the dates of 1999-2005. As all other data is in respect to the year immediately post scan then no further data will be required on any patient post 2006.

Logistic regression will be used to determine whether T2* is predictive of cardiac complications in the 12 months after a patient's CMR scan. Since some patients will have more than 1 scan, a mixed model logistic regression will be used to take account of any within-patient correlation that may occur.

The data will be analysed by Dr Michael Roughton (Medical Statistician, Royal Brompton Hospital)

The results will be disseminated through peer review journals

Study Type Observational
Study Design Time Perspective: Retrospective
Target Follow-Up Duration Not Provided
Biospecimen Not Provided
Sampling Method Not Provided
Study Population Not Provided
Condition Thalassemia
Intervention Not Provided
Study Groups/Cohorts Not Provided
Publications *

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status Completed
Actual Enrollment
 (submitted: August¬†23,¬†2007)
Original Actual Enrollment Same as current
Actual Study Completion Date August 2007
Primary Completion Date Not Provided
Eligibility Criteria

Inclusion Criteria:

  • Thalassaemia Major
  • Patient must have had a cardiac MRI scan between 1999 and 2006

Exclusion Criteria:

  • Other structural heart disease such as valvular abnormalities, MI, congenital heart disease
Sexes Eligible for Study: All
Ages Child, Adult, Older Adult
Accepts Healthy Volunteers Yes
Contacts Contact information is only displayed when the study is recruiting subjects
Listed Location Countries Not Provided
Removed Location Countries  
Administrative Information
NCT Number NCT00520559
Other Study ID Numbers 07/MRE04/32
Has Data Monitoring Committee No
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement Not Provided
Current Responsible Party Not Provided
Original Responsible Party Same as current
Current Study Sponsor Imperial College London
Original Study Sponsor Same as current
Collaborators Not Provided
Principal Investigator: Dudley Pennell, MA, MD Imperial College London
PRS Account Imperial College London
Verification Date April 2019