Effects of Pulmonary Vasodilation Upon VA Coupling in Fontan Patients

Congenital Heart Disease Clinical Trial

Official title:

The Effect of Selective Pulmonary Vasodilation on Ventricular Afterload and Ventricular-arterial Coupling in Patients With Fontan Physiology and Validation of Echocardiographic Measures of Systolic and Diastolic Function.

Clinical Trial Details — Status: Withdrawn

Administrative data

• NCT number: NCT01607983
• Other study ID #: 11-06070
• Status: Withdrawn
• Phase: Phase 3
• Start date: June 2012
• Est. completion date: December 2017

Study information

• Verified date: May 2018
• Source: University of California, San Francisco
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The study involves documenting the effects of inhaled nitric oxide upon ventricular-arterial coupling in patients with congenital heart disease and passive pulmonary blood flow. Consenting patients undergoing a clinically-indicated cardiac catheterization will be given inhaled nitric oxide for 10 minutes while intraventricular pressure-volume analysis will be make via conduction catheters.

Description:

Patients with complex congenital heart disease and single ventricle physiology typically undergo a staged surgical palliation to a situation where the single ventricle is recruited as the systemic pumping chamber and some (following a Glenn surgery) or all (following a Fontan surgery) systemic venous return flows passively to the lungs. While this physiology eliminates ventricular volume loading and normalizes systemic arterial oxygen saturations, there remain a number of physiologic burdens that limit functional capacity and life expectancy. Evidence suggests that this surgical imposition of the systemic and pulmonary vascular beds in series results in ventricular loading conditions that adversely affect ventricular function. At present, there exist limited means by which to mitigate these burdens, however, new therapies directed at reducing total pulmonary resistance may favorably affect patients with this physiology by reducing systemic venous pressures and improving both ventricular preload and afterload. One such therapy is inhaled nitric oxide (iNO), which is a selective pulmonary vasodilator that has been shown to reduce total pulmonary resistance and improve systemic venous pressures in this patient population. However limited data exist regarding the affects of pulmonary vasodilators like iNO on ventricular loading and ventricular-arterial coupling. This study proposes to assess the effects of pulmonary vasodilator therapy upon ventricular loading and ventricular-arterial coupling in single ventricle patients with passive pulmonary blood flow presenting for elective cardiac catheterization. The study components include obtaining routine (they would be obtained as a part of the clinically-indicated catheterization) hemodynamic measurements with hi-fidelity catheters rather than standard fluid-filled catheters, as well as simultaneous additional measurements with the same catheters at rest and during administration of iNO.

Recruitment information / eligibility

• Status: Withdrawn
• Enrollment: 0
• Est. completion date: December 2017
• Est. primary completion date: December 2017
• Accepts healthy volunteers: No
• Gender: All
• Age group: 4 Years to 60 Years

Eligibility

Inclusion Criteria:

• All consecutive patients with single ventricle hearts having passive pulmonary blood flow presenting to the cardiac catheterization laboratory for clinically indicated cardiac catheterization.

Exclusion Criteria:

• Patients with coarctation of the aorta or known bilateral femoral arterial obstruction

• Patients with known severe systemic venous/Fontan obstruction

• Patients already receiving sildenafil or other vasodilator therapy

Related Conditions & MeSH terms

• Congenital Heart Disease
• Fontan
• Heart Defects, Congenital
• Heart Diseases

Intervention

Drug:
• inhaled nitric oxide
20 parts per million (ppm) of inhaled nitric oxide

Locations

Country	Name	City	State
United States	University of California, San Francisco	San Francisco	California

Sponsors (1)

Lead Sponsor	Collaborator
University of California, San Francisco

Country where clinical trial is conducted

United States, 

References & Publications (5)

Cai J, Su Z, Shi Z, Zhou Y, Xu Z, Xu Z, Yang Y. Nitric oxide and milrinone: combined effect on pulmonary circulation after Fontan-type procedure: a prospective, randomized study. Ann Thorac Surg. 2008 Sep;86(3):882-8; discussion 882-8. doi: 10.1016/j.athoracsur.2008.05.014. — View Citation

Senzaki H, Masutani S, Ishido H, Taketazu M, Kobayashi T, Sasaki N, Asano H, Katogi T, Kyo S, Yokote Y. Cardiac rest and reserve function in patients with Fontan circulation. J Am Coll Cardiol. 2006 Jun 20;47(12):2528-35. Epub 2006 May 30. — View Citation

Senzaki H, Masutani S, Kobayashi J, Kobayashi T, Sasaki N, Asano H, Kyo S, Yokote Y, Ishizawa A. Ventricular afterload and ventricular work in fontan circulation: comparison with normal two-ventricle circulation and single-ventricle circulation with blalock-taussig shunts. Circulation. 2002 Jun 18;105(24):2885-92. Retraction in: Circulation. 2012 Jun 12;125(23):e1020. — View Citation

Szabó G, Buhmann V, Graf A, Melnitschuk S, Bährle S, Vahl CF, Hagl S. Ventricular energetics after the Fontan operation: contractility-afterload mismatch. J Thorac Cardiovasc Surg. 2003 May;125(5):1061-9. — View Citation

Tanoue Y, Sese A, Imoto Y, Joh K. Ventricular mechanics in the bidirectional glenn procedure and total cavopulmonary connection. Ann Thorac Surg. 2003 Aug;76(2):562-6. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Effective arterial elastance (Ea)	Patients will undergo hemodynamic evaluation while receiving inhaled nitric oxide. After the measurements are made the nitric oxide will be discontinued. The primary outcome is the change in effective arterial elastance, a value obtained from ventricular pressure-volume assessment, before and while receiving nitric oxide.	Acute, approximately 10-15 minutes