We hypothesize that with Gd-MRI inhomogeneity of lung perfusion can be readily identified and that these areas match areas of trapped air as visualized by proton MRI and CT.
ID
Bron
Verkorte titel
Aandoening
1. Cystic Fibrosis in children;
2. Gd-MRI;
3. Lung hypoperfusion.
Ondersteuning
Onderzoeksproduct en/of interventie
Uitkomstmaten
Primaire uitkomstmaten
The main study parameter will be the ability of the radiologist and CF-team to determine whether hypo perfusion of the lung is present in the Gd-MRI and whether this matches the area of trapped air on the proton-MRI image. And secondly whether the radiologist and CF-team can determine whether there is progression of peripheral airway disease as evaluated on Gd-MRI relative to the CT made in the previous year. This will be rated by the radiologist and the physician using a standardized evaluation form. <br>
To evaluate whether this clinical practice is reproducible, MRI, Gd-MRI and CT scans will be scored in random order by two experienced independent observers. These observers will score independently of each other and they will be blinded as to patient characteristics. The scoring will be done using a semi-quantitative scoring system to estimate the volume% of trapped air and hypo perfusion. The volume% of trapped air on the proton-MRI will be compared to the volume% of hypo perfusion on the Gd-MRI. In addition, volume% of trapped air on the proton-MRI and hypo perfusion on the Gd-MRI will be compared to the volume% of trapped air on the chest CT made in the previous year.
Achtergrond van het onderzoek
Rationale: CF lung disease starts mostly in the first year of life. Traditionally, pulmonary function tests (PFTs) have an important place in the monitoring of CF lung disease. A major disadvantage of PFTs is that they are not very sensitive to localized structural changes. CT is the most sensitive technique to detect structural lung changes in CF. In over 50% of the patients there was discordance between longitudinal changes obtained from CT and from the PFTs. The most relevant information obtained from CT is the detection and progression of bronchiectasis. The second important early morphological change that can be observed on CT is trapped air. A major disadvantage of CT is that is exposes the patient to ionising radiation. Therefore, the use of CT in CF is restricted to one examination every two years. Proton-Magnetic Resonance imaging (proton-MRI) was introduced in the Sophia in 2006 to fill in the gap between the bi-annual CT evaluations. With proton-MRI central bronchiectasis and atelectasis can be well tracked. Unfortunately, the detection of peripheral bronchiectasis and trapped air is of relatively poor quality. Fortunately, trapped air on proton–MRI of the chest can be visualized by looking at lung perfusion since persisting hypoventilation of areas of the lung result in matched hypo perfusion. Hypo perfusion is an even more relevant finding than trapped air since it identifies areas of the lung that do not contribute to gas diffusion. Lung perfusion can be visualized by MRI using intravenously injected contrast agent Gadolinium (Gd). Gd is considered a safe contrast agent that has been used on a large scale since the early nineties. For this reason it has been introduced in the routine follow up in CF patients.
Objective:
Primary Objective:
To asses whether Gd-MRI is a feasible and sensitive technique to monitor the distribution and volume of lung hypo perfusion in patients with CF and to compare the distribution and volume of hypo perfusion on expiratory contrast enhanced Gd-MRI to the areas of trapped air on the routine proton MRI. When this is the case Gd-MRI will be added as a routine to the MRI protocol used in CF patients.
Secondary objectives:
To compare the distribution and volume of hypo perfusion on expiratory Gd-MRI with the distribution and volume of trapped air on expiratory chest CT made in the previous year.
To compare the distribution and volume of hypo perfusion on expiratory contrast enhanced Gd-MRI to PFTs parameters of peripheral airway disease (FEF75, FEF25-75, LCI).
Hypothesis: We hypothesize that with Gd-MRI inhomogeneity of lung perfusion can be readily identified and that these areas match areas of trapped air as visualized by proton-MRI and CT.
Study design: This will be a two-year cohort study. Patients who are scheduled for their routine bi-annual proton-MRI will be informed about the study at least 3 weeks before the annual examination. Informed consent will be requested. Instruction of the routine breathhold maneuvers will be exercised during the routine visit 3 months prior to the MRI. On the day of the MRI breath hold maneuvers will be shortly rehearsed. The routine annual blood withdrawal will be done after insertion of a peripheral catheter. Next the peripheral catheter will be flushed using a low strength heparin solution. Finally, the patient will have their routine proton-MRI and a Gd-MRI.
Study population: A cohort of 30 consecutive patients with CF between 6 and 18 years of age who are scheduled for their routine annual proton-MRI.
Intervention (if applicable): All patients will have an infusion of the contrast agent Gd.
Main study parameters/endpoints: The ability of the radiologist and CF team to identify areas of the lung that are hypo perfused on the Gd-MRI relative to the proton-MRI.
Secondary study parameters/endpoints.
The distribution and volume of hypo perfused lung on the expiratory Gd-MRI will be compared to the distribution of trapped air on the expiratory proton-MRI and with the expiratory chest CT made in the previous year. This will be done using a semi-quantitative scoring system. The hypo perfusion score on expiratory contrast enhanced Gd-MRI will be correlated to the score for trapped air on the MRI, to the CT of the year before and to lung function parameters sensitive to peripheral airway disease (FEF75, FEF25-75, LCI).
In addition, the feasibility of the Gd-MRI protocol will be evaluated. Indicators will be total duration of examination time. Number of completed Gd-MRI examinations as percentage of total number of performed Gd-MRI examinations. Number of successful venous catheter insertions. Side-effects of Gd infusion in this CF patient group especially incidence of complications such as allergic reactions.
Doel van het onderzoek
We hypothesize that with Gd-MRI inhomogeneity of lung perfusion can be readily identified and that these areas match areas of trapped air as visualized by proton MRI and CT.
Onderzoeksproduct en/of interventie
After informed consent children with CF scheduled (for annual check up) for a proton MRI will also undergo a Gadolinium-MRI.
Algemeen / deelnemers
Room Sb2778
Wytemaweg 80
E. Wiel van der
Rotterdam 3015 CN
The Netherlands
+31(0)10 4636797
e.vanderwiel@erasmusmc.nl
Wetenschappers
Room Sb2778
Wytemaweg 80
E. Wiel van der
Rotterdam 3015 CN
The Netherlands
+31(0)10 4636797
e.vanderwiel@erasmusmc.nl
Belangrijkste voorwaarden om deel te mogen nemen (Inclusiecriteria)
1. Age between 6-18 years old;
2. Diagnosis CF confirmed;
3. Stable condition;
4. Ability to perform lung function tests and breath hold tests;
5. CT can made in the year before the MRI;
6. Signed written informed consent;
7. Able to comply with the protocol requirements.
Belangrijkste redenen om niet deel te kunnen nemen (Exclusiecriteria)
1. Inability to follow instructions of the investigator;
2. Current respiratory tract infection;
3. Requiring iv antibiotics;
4. Pulmonary complications;
5. Claustrofobia;
6. History of anaphylactic reaction on contrast agent;
7. Any clinical condition which, according to the treating physician, might put the patient at risk;
8. Severe astma and/or severe allergies as determined by physician.
Opzet
Deelname
Opgevolgd door onderstaande (mogelijk meer actuele) registratie
Geen registraties gevonden.
Andere (mogelijk minder actuele) registraties in dit register
Geen registraties gevonden.
In overige registers
| Register | ID |
|---|---|
| NTR-new | NL1027 |
| NTR-old | NTR1059 |
| Ander register | : METC 2007-289 |
| ISRCTN | ISRCTN wordt niet meer aangevraagd |
Samenvatting resultaten
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