A 48-week Study of the Effect of Dual Therapy (Inhaled Treprostinil and Tadafafil) Versus Monotherapy (Tadalafil).

Stanford University

Status and phase: Completed; Phase 4

Conditions: Hypertension, Pulmonary

Treatments: Drug: treprostinil inhalations; Drug: tadalafil

Study type: Interventional

Funder types: Other

Identifiers

NCT01305252

IRB protocol # 18305

SU-07152010-6565

Details and patient eligibility

About

The Study Hypothesis:

Aggressive, upfront, dual therapy for treatment-naïve NYHA I/II/III PAH is superior to a traditional "step-up" approach.

The study will evaluate:

1. Impact of dual, upfront, therapy on cardiovascular parameters in PAH as gauged by cardiac magnetic resonance imaging (cMRI) at 24 weeks and event free survival at outcome at 48 weeks.
2. Value of novel biomarkers (NT-pro BNP, Mts1/S100A4, and insulin resistance) and cutting-edge imaging technologies (cardiac MRI) as newer endpoints for clinical trials in PAH.
3. Utility of longer clinical trial design with the use of combined clinical events as time to clinical worsening surrogate

Full description

This is a 48 week interventional study evaluating the effect of Dual therapy ( Treprostinil inhalations and Tadalafil) versus Mono therapy (Tadalafil). The impact of the therapy on cardiovascular parameters in PAH measured at 24 weeks and event free survival outcome at 48 weeks.

Enrollment: 21 patients

Sex: All

Ages: 18 to 69 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Age 18 and < 75 years at baseline visit.

2. Diagnosis of Idiopathic PAH, Heritable PAH (including Hereditary Hemorrhagic Telangiectasia), Associated PAH (including collagen vascular disorders, drug+toxin exposure, repaired congenital heart disease repaired > 5 years, portopulmonary disease, and human immunodeficiency virus (HIV) infection not on protease inhibitor).

3. PAH treatment naïve including any prostacycline, endothelin receptor antagonist, or phosphodiesterase inhibitors within 12 months prior to enrollment.

4. Previous Right Heart Catheterization that documented:

   1. Mean PAP; 25 mmHg.
   2. Pulmonary capillary wedge pressure < 15 mmHg.
   3. Pulmonary Vascular Resistance; 3.0 Wood units or 240 dynes/sec/cm5 5.6MW distances; 150 m and < 450 meters.

5. WHO functional class II or III as judged by principal investigators.

Exclusion criteria

Exclusion criteria:

1. Group II - V pulmonary hypertension.

2. PAH with unrepaired congenital heart defect.

3. Current or prior PAH treatments within the last 6-12 months including experimental PAH therapies (including but not limited to tyrosine kinase inhibitors, rho-kinase inhibitors, phosphodiesterase inhibitors, prostacycline, or cGMP modulators).

4. TLC < 60% predicted; if TLC b/w 60 and 70% predicted, high resolution computed tomography must be available to exclude significant interstitial lung disease.

5. FEV1 / FVC < 70% predicted and FEV1 < 60% predicted

6. Significant left-sided heart disease (based on pre-trial Echocardiogram):

   1. Significant aortic or mitral valve disease
   2. Diastolic dysfunction ; Grade II C.LV systolic function < 45%

   d. Pericardial constriction e. Restrictive cardiomyopathy f. Significant coronary disease with demonstrable ischemia

7. Chronic renal insufficiency defined as an estimated creatinine clearance < 30 ml/min (by MDRD equation)

8. Current atrial arrhythmias

9. Uncontrolled systemic hypertension: SBP > 160 mm or DBP > 100mm

10. Severe hypotension: SBP < 80 mmHg.

11. Pregnant or breast-feeding

12. Psychiatric, addictive, or other disorder that compromises patient's ability to provide informed consent, follow study protocol, and adhere to treatment instructions

13. Co-morbid conditions that would impair a patient's exercise performance and ability to assess WHO functional class, including but not limited to chronic low-back pain or peripheral musculoskeletal problems.

14. Contraindications for magnetic resonance imaging, including significant claustrophobia, implanted metallic objects, or others as per Appendix X).

15. Known allergy to treprostinil or tadalafil.

16. Active oral nitrate use.

17. Diabetes mellitus.

18. Planned initiation of cardiac or pulmonary rehabilitation during period of study.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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21 participants in 2 patient groups

tadalafil alone

Active Comparator group

Description:

tadalafil 40mg QD(Tadalafil 20 mg QD PO increasing to 40 mg QD as tolerated).

Treatment:

Drug: tadalafil

tadalafil and treprostinil inhalations

Active Comparator group

Description:

Treprostinil inhalation QID starting at 3 breaths per inhalation \& gradually increasing to 9 breaths.Each breath provides approximately 6 mcg of treprostinil.Tadalafil 20 mg QD PO increasing to 40 mg QD as tolerated.

Treatment:

Drug: treprostinil inhalations

Drug: tadalafil