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BICYCLE trial.

- candidate number14083
- NTR NumberNTR3746
- ISRCTNISRCTN wordt niet meer aangevraagd.
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR10-dec-2012
- Secondary IDs2012-004067-41 METC AMC
- Public TitleBICYCLE trial.
- Scientific TitleBosentan in exercise induced pulmonary arterial hypertension in congenital heart disease.
- hypothesisIn adult congenital heart disease patients with exercise-induced pulmonary arterial hypertension, treatment with bosentan lowers the mean pulmonary arterial pressure, which may result in improvement of the cardiopulmonary circulation, cardiopulmonary exercise capacity and quality of life.
- Healt Condition(s) or Problem(s) studiedPulmonary arterial hypertension, Congenital heart defects, Exercise induced, Cardiopulmonary exercise test
- Inclusion criteriaIn order to be eligible to participate in this study, a subject must meet all of the following criteria:
1. Adult (>18 years) and mentally competent;
2. Open or closed septal defect (ASD I/II, VSD, AVSD);
3. Open or closed systemic-to-pulmonary shunt (PDA);
4. Presence of X-PAH:
A. One of the following criteria, at peak exercise:
i. mPAP > 34 mmHg with CO ≤ 10 l/min;
ii. mPAP > 40 mmHg with CO ≤ 15 l/min;
iii. mPAP > 45 mmHg with CO ≤ 20 l/min;
iiii. mPAP > 50 mmHg with CO ≤ 30 l/min.
B. And a PVR (slope pressure/flow plot) of > 2.5 mmHg/l/min.
- Exclusion criteriaA potential subject who meets any of the following criteria will be excluded from participation in this study:
1. Incapable of giving informed consent;
2. Pregnancy or lactation (a pregnancy test is offered to every female patient within fertile age);
3. Women of child-bearing age who are sexually active without practising reliable methods of contraception;
4. Substance abuse (alcohol, medicines, drugs);
5. Subjects who are not able to perform cardiopulmonary exercise testing;
6. Any cardiac operation < 6 months before inclusion;
7. PAH of any aetiology other than the one specified in the inclusion criteria;
8. Impairment of organic function (renal, hepatic);
9. Arterial hypotension (systolic blood pressure < 85mmHg);
10. Anaemia (Hb < 10g/L, or <6.21 mmol/L);
11. Significant valvular disease, other than tricuspid or pulmonary regurgitation;
12. Chronic lung disease or total lung capacity < 80% predicted value;
13. History of significant pulmonary embolism;
14. Other relevant diseases (HIV infection, Hep B/C infection);
15. Subjects with known intolerance to bosentan or their constituents;
16. Prohibited medication: Any medication listed below which has not been discontinued at least 30 days prior to inclusion:
A. Unspecified or other significant medication (glyburide or immunosuppression);
B. PAH therapy (endothelin receptor antagonists, PDE-5 inhibitors, prostanoids);
C. Medication which is not compatible with bosentan or interferes with its metabolism (inhibitors of CYP2C9, CYP3A4) or medication which may interfere with bosentan treatment according to the investigator.
- mec approval receivedno
- multicenter trialno
- randomisedyes
- masking/blindingDouble
- controlPlacebo
- groupParallel
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-jan-2013
- planned closingdate1-jan-2015
- Target number of participants40
- InterventionsWhen all baseline procedures have been performed and the investigator has observed that all inclusion and none of the exclusion criteria apply, patients are randomised by the investigator using a computerized randomisation tool. Randomisation is performed by the investigator after informed consent has been contained. Eligible patients are randomly assigned to one of the following treatment arms:
1. 6 months of treatment with bosentan 125 mg twice a day;
2. 6 months of treatment with placebo twice a day.
The starting dosage of bosentan is 62,5 mg twice a day. Trial medication is doubled after 4 weeks to reach study dose, after checking liver parameters.
- Primary outcomeThe primary objective of this study is to determine change in mean pulmonary arterial pressure at peak exercise in adult congenital heart disease patients with exercise-induced pulmonary arterial hypertension before and after treatment with bosentan, compared to patients treated with placebo.
- Secondary outcomeTo determine:
1. Cardiopulmonary exercise capacity: i.e. peak oxygen consumption, VE/VCO2 ratio, O2 pulse;
2. Pulmonary hemodynamics: i.e. systolic pulmonary arterial pressure, pulmonary vascular resistance, pressure-flow relationships during and at peak exercise;
3. Right ventricular function: i.e. TAPSE, TEI index, TDI-S, right ventricular dimensions;
4. Laboratory parameters:
i.e. NT-pro BNP, troponin T;
5. NYHA functional class;
6. Quality of life: assessed by TAAQOL-CHD, SF-36 and Minnesota CHD-HF questionnaire.
- TimepointsPatients are requested to visit the outpatient clinic at baseline, at 3 and 6 months follow-up.
- Trial web site
- statusplanned
- Sponsor/Initiator Academic Medical Center (AMC), Amsterdam
- Funding
(Source(s) of Monetary or Material Support)
Academic Medical Center (AMC), Amsterdam
- PublicationsN/A
- Brief summaryRationale:
Pulmonary arterial hypertension (PAH) can be a rapidly progressive disorder and is associated with a high mortality rate, despite medical intervention. With the availability of effective therapy, early disease detection is an important strategic objective to improve treatment outcomes. Resting echocardiography is currently the recommended screening modality for high-risk population groups. However, it is clear that abnormalities in resting hemodynamics (and symptoms) are late sequelae of the pathobiological processes that begin in the distal pulmonary arteries. Exercise stress may unmask early pulmonary vascular dysfunction, however the definition, clinical significance, and natural history of ‘exercise PAH’ remain undefined. However, based on clinical experience and literature the prevalence is estimated at ~ 20%.Treatment with endothelin receptor blockers has shown a beneficial influence on the clinical performance in patients with exercise induced PAH due to systemic sclerosis and primary pulmonary hypertension. Whether endothelin receptor blockers decrease pulmonary pressures and improve clinical outcome in patients with exercise induced pulmonary arterial hypertension due to congenital heart disease is unknown.

Identify congenital heart disease patients with exercise-induced pulmonary arterial hypertension. Analyze changes in pulmonary arterial pressures at peak exercise in patients with exercise induced pulmonary arterial hypertension before and after treatment with bosentan, compared to placebo.

Study design:
Randomized placebo controlled trial with a study period of 26 weeks.

Study population:
Adult congenital heart disease patients with exercise induced pulmonary arterial hypertension (n=40) from the Academic Medical Centre, Amsterdam.

After randomization one group (n=20) receives a 125 mg tablet of Bosentan twice daily for 6 months. The other group (n=20) receives placebo for 6 months.

Main study parameters/endpoints:
To determine wether bosentan (endothelin receptor inhibitor) decreases mean pulmonary arterial pressure at peak exercise in adult congenital heart disease patients with exercise induced pulmonary arterial hypertension. Furthermore the change in cardiopulmonary exercise capacity and right ventricular function will be investigated.

Nature and extent of the burden and risks associated with participation, benefit and group relatedness:
All investigations, blood analysis excepted, are non-invasive and free of risk. The burden for the patients mainly consists of the time that is consumed by the investigations, namely: history taking + physical examination (15 min); Quality-of-Life- score (15 min); laboratory tests (electrolytes, creatinine, urea, albumin and neurohormones, troponin T); 12 lead electrocardiogram (10 min); exercise echocardiography (30 min); cardiovascular exercise testing (30 min).
The trial medication has a potential risk of liver damage, which will be monitored regularly by laboratory testing of liver transaminases.
- Main changes (audit trail)
- RECORD10-dec-2012 - 3-jan-2013

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