Clinical trial NCT03997097: Efficacy of Phosphodiesterase-type 5 Inhibitors in Patients With Univentricular Congenital Heart Disease
Official title: Phosphodiesterase-type 5 Inhibitors in Adult and Adolescent Patients With Univentricular Heart Disease: a Multi-center, Randomized, Double Blind Phase III Study
Study type: INTERVENTIONAL
Overall status: WITHDRAWN
Phase: PHASE3
Conditions: Single-ventricle
Pulmonary Hypertension
Univentricular Heart
Keywords: Congenital heart defect
single ventricle
Pulmonary hypertension
sildenafil
pulmonary vasodilator
Eexercise capacity
Lead sponsor: University Hospital, Montpellier
Sponsor class: OTHER
First posted: 2019-06-25
Enrollment: 0
Sex: ALL
Minimum age (years): 15
Maximum age (years): 80
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: In univentricular hearts, selective lung vasodilators such as phosphodiesterase type 5 (PDE5) inhibitors would decrease pulmonary resistance and improve exercise tolerance. However, the level of evidence for the use of PDE5 inhibitors in patients with a single ventricle (SV) remains limited. the investigators present the SV-INHIBITION study rationale, design and methods.The SV-INHIBITION trial is a nationwide multicentre, randomised, double blind, placebo-controlled, phase III study, aiming to evaluate the efficacy of sildenafil on the ventilatory efficiency during exercise, in teenagers and adult patients (\>15 y.o.) with a SV. Patients with pulmonary arterial hypertension (mean pulmonary arterial pressure (mPAP) \> 15 mmHg and trans-pulmonary gradient \> 5 mmHg) measured by cardiac catheterisation, will be eligible. The primary outcome is the variation of the VE/VCO2 slope, measured by a cardiopulmonary exercise test, between baseline and 6 months of treatment. A total of 50 patients are required to observe a decrease of 5 ± 5 points in the VE/VCO2 slope, with a power of 90% power and an alpha risk of 5%. The secondary outcomes are: clinical outcomes, 6 minute walk test, SV function, NT Pro BNP, VO2max, stroke volume, mPAP, trans-pulmonary gradient, SF36 quality of life score, safety and acceptability. This study aims to answer the question whether PDE5 inhibitors should be prescribed in patients with a SV. This trial has been built focusing on the 3 levels of research defined by the WHO: disability (exercise tolerance), deficit (SV function), and handicap (quality of life).

Detailed description: 50 Patients with a single ventricle (e.g. univentricular heart), as defined by the ACC-CHD classification, with a mean pulmonary arterial pressure (mPAP) \> 15 mmHg and a trans-pulmonary gradient (TPG) \> 5 mmHg, and aged 15 years old and above, will be prospectively recruited in the participating centres during their regular follow-up.

Patients wil be randomised into 2 groups:

* Patients randomised in the group 1 will receive sildenafil in 3 oral doses of 20 mg per day (t.i.d.), as defined in the marketing authorization indicated for PAH in adolescent and adult patients, and for a period of 6 months.
* Patients in the group 2 will receive a placebo (t.i.d.), for the same period of 6 months. To guarantee the double blind, capsules will be similar in size and colour and will be differentiated only by a vial number regarding to the randomization list. The clinical trials unit of the sponsor's pharmacy will centralize treatment allocation and supply to the participating centres. Drug management (reception, storage, delivery and traceability) will be ensured by the pharmacies of the participating centres.

After the 6 month-treatment period, patients will be followed for 3 months, and undergo at least 2 safety visits (1 and 3 months after intervention, and if necessary, any supplementary unscheduled visits). In accordance with the recommendations of the drug notice, the treatment will be suspended progressively over 1 week (20 mg b.i.d for 3 days, then 20 mg q.d. for 4 days, and then stopped) with a reinforcement of the surveillance. Patients will be able to contact an emergency number during this period and the investigator may decide to continue open treatment with sildenafil if clinically justified.

The study will be conducted in compliance with the Good Clinical Practices protocol and Declaration of Helsinki principles. It was approved by a drawn National Ethics Committee (CPP) and by the French National Agency of Medicine and Health Products Safety (ANSM). Informed consent will be obtained from all patients and their parents or legal guardians for minors.

Eligibility criteria: Inclusion Criteria:

1. 15 years of age and over.
2. Patient's weight over 20 kg
3. Patients with CHD with a single ventricular type defined by the classification of congenital heart diseases in Orphanet (53).
4. PAH defined by diagnostic catheterization with mean PAP \> 15 mmHg and a trans-pulmonary gradient \> 5 mmHg, performed as part of the usual follow-up. No definition of PAH in SV is available as a result of a particular physiology. Therefore, we chose the 15mmHg cut-off, which is used in clinical routine to allow or contra-indicate the Fontan procedure \[50,51\].
5. Appropriate written informed consent (adult patients, legal parents for teenagers), and formal assent (teenagers), should to be provided.
6. Beneficiary of a health insurance.

Exclusion Criteria:

1. Patient who is unable to perform a cardio-pulmonary exercise test.
2. Cardiac surgery planned during the trial.
3. Patient treated by any pulmonary arterial vasodilator drug, as defined in the 2015 PH guidelines (52), within 6 months before inclusion, regardless the duration and the type(s) (oral, intravenous, subcutaneous, inhaled) of administration.
4. Patient treated by Sildenafil or any other type of phosphodiesterase-type 5 inhibitor (such as tadalafil) within 6 months before inclusion, regardless the duration of administration.
5. Interventional cardiac catheterization planned during the trial (collateral occlusion, fenestration occlusion, stenting, angioplasty, ablation of rhythm disorder), other than during the screening.
6. Participation in another clinical trial or administration of an off-label drug in the 4 weeks preceding the screening.
7. Pregnancy, desire for pregnancy, absence of contraception during the study period.
8. Severe hepatic insufficiency (Child-Pugh C class).
9. Hypersensitivity to the active substance or to any of the excipients of the tablet:

   microcrystalline cellulose, calcium hydrogen phosphate anhydrous, croscarmellose sodium, stearate of magnesium, hypromellose, titanium dioxide (E171), monohydrate lactose, glycerol triacetate.
10. Combination with products called "nitric oxide donors" (such as amyl nitrite) or with nitrates in any form, due to the hypotensive effects of nitrates.
11. Concomitant administration of PDE5 inhibitors, such as Sildenafil, with guanylate cyclase stimulators, such as Riociguat.
12. Combination with the most potent inhibitors of CYP3A4 (eg ketoconazole, itraconazole, ritonavir).
13. Disposition to priapism, sclerosis of corpora cavernosa, disease of La Peyronie, sickle cell anemia, multiple myeloma, leukemia.
14. Uncontrolled hypotension or risk of hypotension: water depletion, obstruction to ejection of the left ventricle, dysfunction of the autonomic nervous system, patient under alpha-blocker.
15. Severe cardiovascular events, recent (\<3 months) or not stabilized: myocardial infarction, unstable angina, sudden cardiac death, ventricular arrhythmia, cerebrovascular hemorrhage.
16. Active hemorrhagic disorders.
17. Active gastro-duodenal ulcer.
18. Patients with loss of vision of an eye due to non-arteritic anterior ischemic optic neuropathy (NAION), whether or not this event has been associated with previous exposure to a PDE5 inhibitor.

Primary outcomes:
measure: ventilatory efficiency M0
timeFrame: Month 0
measure: ventilatory efficiency M6
timeFrame: Month 6
Secondary outcomes:
measure: VO2 max M0
timeFrame: Month 0
measure: VO2 max M6
timeFrame: Month 6
measure: ventilatory anaerobic threshold M0
timeFrame: Month 0
measure: ventilatory anaerobic threshold M6
timeFrame: Month 6
measure: oxygen pulse M0
timeFrame: Month 0
measure: oxygen pulse M6
timeFrame: Month 6
measure: OUES M0
timeFrame: Month 0
measure: OUES M6
timeFrame: Month 6
measure: NYHA functional class M0
timeFrame: Month 0
measure: NYHA functional class M6
timeFrame: Month 6
measure: blood pressure M0
timeFrame: Month 0
measure: blood pressure M6
timeFrame: Month 6
measure: oxygen saturation SaO2
timeFrame: Month 0
measure: oxygen saturation SaO2
timeFrame: Month 6
measure: 6-minute walk test (6MWT)
timeFrame: Month 0
measure: 6-minute walk test (6MWT)
timeFrame: Month 6
measure: Health-related quality of life
timeFrame: Month 0
measure: Health-related quality of life
timeFrame: Month 6
measure: Systemic blood flow
timeFrame: Month 0
measure: Systemic blood flow
timeFrame: Month 6
measure: SV systolic ejection fraction
timeFrame: Month 0
measure: SV systolic ejection fraction
timeFrame: Month 6
measure: 2D strain SV function
timeFrame: Month 0
measure: 2D strain SV function
timeFrame: Month 6
measure: Systemic blood flows in phase contrast
timeFrame: Month 0
measure: Systemic blood flows in phase contrast
timeFrame: Month 6
measure: Pulmonary blood flows in phase contrast
timeFrame: Month 0
measure: Pulmonary blood flows in phase contrast
timeFrame: Month 6
measure: SV systolic ejection fraction
timeFrame: Month 0
measure: SV systolic ejection fraction
timeFrame: Month 6
measure: SV systolic ejection volume
timeFrame: Month 0
measure: SV systolic ejection volume
timeFrame: Month 6
measure: NT Pro BNP
timeFrame: Month 0
measure: NT Pro BNP
timeFrame: Month 6
measure: forced expiratory volume in 1 s (FEV1 )
timeFrame: month 0
measure: forced expiratory volume in 1 s (FEV1 )
timeFrame: month 6
measure: Forced vital capacity FVC
timeFrame: month 0
measure: Forced vital capacity FVC
timeFrame: month 6
measure: FEV1%
timeFrame: month 0
measure: FEV1%
timeFrame: month 6
measure: DEMM25/75
timeFrame: month 0
measure: DEMM25/75
timeFrame: month 6
measure: Capillary lung volume
timeFrame: month 0
measure: Capillary lung volume
timeFrame: month 6
measure: Cardiac catheterization
timeFrame: month 0
measure: Cardiac catheterization
timeFrame: month 6
measure: percentage of patients compliant at 6 months of study treatment
timeFrame: month 6
measure: AE
timeFrame: month 6
measure: SAE
timeFrame: month 6
Other outcomes:
Locations:
Study officials:
affiliation: University Hospital, Montpellier
name: Pascal AMEDRO, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Amedro P, Gavotto A, Abassi H, Picot MC, Matecki S, Malekzadeh-Milani S, Levy M, Ladouceur M, Ovaert C, Aldebert P, Thambo JB, Fraisse A, Humbert M, Cohen S, Baruteau AE, Karsenty C, Bonnet D, Hascoet S; SV-INHIBITION study investigators. Efficacy of phosphodiesterase type 5 inhibitors in univentricular congenital heart disease: the SV-INHIBITION study design. ESC Heart Fail. 2020 Apr;7(2):747-756. doi: 10.1002/ehf2.12630. Epub 2020 Mar 9.