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The Effects of Sildenafil on Exercise Function and Capacity in Patients With Fontan Circulation

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified July 2010 by Penn State University.
Recruitment status was:  Recruiting
Children's Miracle Network
Information provided by:
Penn State University Identifier:
First received: August 21, 2009
Last updated: July 21, 2010
Last verified: July 2010
The study will test the hypothesis that a single dose of sildenafil can increase the exercise capacity of pediatric patients with a Fontan Circulation.

Condition Intervention Phase
Fontan Circulation
Drug: sildenafil
Other: placebo
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double Blind (Participant, Care Provider, Investigator)
Primary Purpose: Treatment
Official Title: The Effects of Sildenafil on Exercise Function and Capacity in Patients With Fontan Circulation

Resource links provided by NLM:

Further study details as provided by Penn State University:

Primary Outcome Measures:
  • An increase in exercise capacity for patients administered sildenafil [ Time Frame: From 1 to 6 months from the date of the baseline stress test ]

Estimated Enrollment: 30
Study Start Date: August 2009
Estimated Study Completion Date: August 2011
Estimated Primary Completion Date: August 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Sildenafil
Sildenafil dosage will be 0.5mg/kg (max 20mg)
Drug: sildenafil
oral suspension, 0.5mg/kg, taken once prior to exercise stress test
Other Name: Viagra
Placebo Comparator: placebo
Patient will receive a look-alike placebo
Other: placebo
Patient will receive a look-alike placebo
Other Name: Composition of the placebo will be Ora-sweet and Ora-plus (1:1 ratio).


Ages Eligible for Study:   6 Years to 17 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Age 6-17 years
  • Male or female
  • Possess Fontan Circulation

Exclusion Criteria:

  • Severe heart failure (New York Heart Ass. functional class IV)
  • Evidence of Fontan pathway obstruction
  • History of exercise-induced severe arrhythmias
  • Pregnancy (known or suspected)
  • Orthopedic limitations that prevent ambulation on a treadmill
  • Use of nitroglycerin
  • Herbal medications
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00964782

Contact: Devyani Chowdhury, MD 717-531-6847
Contact: Matthew S. Dean, MS 717-531-1847

United States, Pennsylvania
Penn State Hershey Medical Center Recruiting
Hershey, Pennsylvania, United States, 17033
Contact: Chowdhury   
Principal Investigator: Devyani Chowdhury, MD         
Sub-Investigator: Stephen E Cyran, MD         
Sub-Investigator: Matthew S. Dean, MS         
Sponsors and Collaborators
Penn State University
Children's Miracle Network
Principal Investigator: Devyani Chowdhury, MD Milton S. Hershey Medical Center
  More Information

Responsible Party: Devyani Chowdhury/MD, Penn State Hershey Medical Center Identifier: NCT00964782     History of Changes
Other Study ID Numbers: 31171
Study First Received: August 21, 2009
Last Updated: July 21, 2010

Keywords provided by Penn State University:
exercise capacity
Patients with Fontan Circulation

Additional relevant MeSH terms:
Sildenafil Citrate
Vasodilator Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Urological Agents processed this record on April 28, 2017