Ambrisentan in Patients With Porto-pulmonary Hypertension A Multicenter Open Label Trial

Status:Active, not recruiting
Conditions:High Blood Pressure (Hypertension)
Therapuetic Areas:Cardiology / Vascular Diseases
Age Range:18 - Any
Start Date:March 2010
End Date:October 2018

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This is an Open Label, Multicenter, pilot clinical trial to assess the efficacy and safety of
an oral selective Endothelin Receptor Antagonist (ambrisentan) in patients with
portopulmonary hypertension.

Preliminary evidence suggests that ambrisentan is safe and effective in patients with
portopulmonary hypertension. The goal of therapy for these patients is to improve symptoms of
dyspnea and to improve pulmonary hemodynamics to a mean pulmonary artery pressure <35 mm Hg
in order to make patients eligible for liver transplantation. Therefore, the primary
endpoints for this study will include 6 minute walk distance (6MWD) and pulmonary vascular
resistance (PVR).

Eligible subjects will receive 5 mg ambrisentan once-daily for the first 4 weeks. After the
initial 4-week period, investigators will increase study drug dose to 10 mg once daily (both
5 mg and 10 mg doses are FDA approved). If 10 mg is not tolerated in the opinion of
investigator, then the investigator may decrease the dose back to 5 mg once daily. Primary
outcome is a change in both the 6MWD and in PVR from baseline to Week 24. Subjects will be
monitored with liver function tests (LFT) every 2 weeks for the first 8 weeks, then every 4
weeks thereafter. These safety laboratory tests may be performed at a local phlebotomy
laboratory or at the Investigator clinic. In addition, the Investigator will assess each
subject for safety and efficacy at Week 4, Week 12, and Week 24. Following Week 24, subjects
will be assessed for safety and efficacy every 12 weeks. Patients will be followed for a
total of 1 year. After 1 year, if the Investigator feels that continuing the treatment will
be beneficial to the patients, they will be provided with ambrisentan by Gilead
Pharmaceuticals, free of charge.

Inclusion Criteria:

Subjects need to fulfill all of the following 4 criteria:

1. Evidence of portal hypertension (by hemodynamic measurement, or by Doppler flow of
portal circulation, or by clinical evidence of portal hypertension such as esophageal
or gastric varices, as evidenced by prior upper endoscopy).

2. Evidence of pulmonary arterial hypertension by right heart catheterization (all three
criteria need to be present) Right heart catheterization may have been performed up to
30 days prior to screening

- Mean PAP (pulmonary artery pressure) >25 mm Hg, and

- PVR (pulmonary vascular resistance) >240 dynes/s/cm5, and

- TPG (transpulmonary gradient = meanPAP -PAWP) >12 mm Hg

3. Baseline AST, ALT < 5 times the upper limit of normal, total Bili < 3.0 mg/dl, and
mild liver impairment with Child -Pugh class A or B

4. Ages 18 years and above

Exclusion Criteria:

1. Presence of any other etiology of pulmonary arterial hypertension (HIV, connective
tissue disease, sickle cell, left heart failure, chronic thromboembolic PH, etc)

2. Treatment with prostacyclins, other ERAs, or PDE5 inhibitors within 30 days of

3. Moribund state or anticipated death within 1 month.

4. AST or ALT ≥ 5 times upper limit of normal

5. Total bilirubin ≥ 3.0 mg/dl

6. Significant lung disease (obstructive lung disease with FEV1 < 1L, or FEV1/FVC <50%;
or restrictive lung disease with Total Lung Capacity < 60% predicted). PFTs may have
been performed up to 6 months prior to enrollment.

7. Pregnancy

8. Age <18 years

9. Child -Pugh class C
We found this trial at
4500 San Pablo Rd S
Jacksonville, Florida 32224
(904) 953-2000
Mayo Clinic Florida Thousands of people come to Mayo Clinic in Jacksonville, Fla., annually for...
Jacksonville, FL
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800 Washington St
Boston, Massachusetts 02111
(617) 636-5000
Principal Investigator: Ioana Preston, MD
Phone: 617-636-1334
Tufts Medical Center Tufts Medical Center is an internationally-respected academic medical center – a teaching...
Boston, MA
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Chapel Hill, North Carolina 27599
(919) 962-2211
Principal Investigator: James Ford, MD
Phone: 919-966-2531
Univ of North Carolina Carolina’s vibrant people and programs attest to the University’s long-standing place...
Chapel Hill, NC
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Columbus, Ohio 43210
Principal Investigator: Namita Sood, MD
Phone: 614-366-2287
Columbus, OH
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2201 Inwood Rd
Dallas, Texas 75235
(214) 645-8300
Principal Investigator: Megan Devine, MD
Phone: 214-645-7148
U.T. Southwestern Medical Center The story of UT Southwestern Medical Center is one of commitment...
Dallas, TX
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La Jolla, California 92093
Principal Investigator: David S. Poch, MD
Phone: 858-657-7122
La Jolla, CA
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