Body Volume Regulation in Pulmonary Arterial Hypertension With Right Ventricular Failure - Full Text View

Purpose

Secondary hyperaldosteronism and the non-osmotic release of arginine vasopressin (AVP) are the major factors in sodium and water retention in pulmonary arterial hypertension with right ventricular failure. Natriuretic doses of mineralocorticoid antagonist and aquaretic doses of V2 receptor antagonist will attenuate the sodium and water retention respectively, and be associated with clinical improvement.

Condition	Intervention
Right Heart Failure Pulmonary Hypertension	Drug: Spironolactone and conivaptan


Study Type:	Interventional
Study Design:	Allocation: Randomized Intervention Model: Parallel Assignment Masking: Open Label Primary Purpose: Treatment
Official Title:	Body Volume Regulation in Pulmonary Arterial Hypertension With Right Ventricular Failure

Resource links provided by NLM:

Genetics Home Reference related topics: pulmonary arterial hypertension

Drug Information available for: Spironolactone Conivaptan hydrochloride Conivaptan

Genetic and Rare Diseases Information Center resources: Pulmonary Arterial Hypertension

U.S. FDA Resources

Further study details as provided by University of Colorado, Denver:

Primary Outcome Measures:

Cross sectional study [ Time Frame: 18 months ]
Correlation between severity of pulmonary hypertension and neurohumoral activation, Regional Blood Flow (RBF) & Transcatheter Pulmonary Valve (TPV). Acute study:electrolyte-free water and sodium excretion. Cohort Study: Composite of Cardiac index (CI),brain natriuretic peptide (BNP) and Right Atrial Pressure (RAP)

Secondary Outcome Measures:

Cross-sectional Study [ Time Frame: 18 months ]
Correlations between mean pulmonary artery pressure, pulmonary vascular resistance; and neurohumoral activation, glomerular filtration rate (GFR) and Transcatheter Pulmonary Valve (TPV). Acute study:correlation between response to drug and severity of disease.


Enrollment:	0
Study Start Date:	January 2009
Study Completion Date:	December 2010
Primary Completion Date:	July 2010 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
No Intervention: Usual care Group II
Experimental: Spironolactone and conivaptan Group I	Drug: Spironolactone and conivaptan Tablet, 50 mg to 200 mg, daily, orally 20 mg intravenously one time over 30 minutes

Detailed Description:

Much has been learned about the pathophysiological state that underlies the development of increased total body volume and edema in left ventricular failure. Very little, however, is known about the mechanism underlying systemic hypervolemia in patients with isolated right ventricular dysfunction. Patients with pulmonary arterial hypertension (PAH) represent a model of isolated right ventricular dysfunction in which these mechanisms may be elucidated. Aldosterone has now been shown to have many properties that are likely to be detrimental in congestive heart failure (CHF) and that are not shared by angiotensin II. Aldosterone blockade has been associated with improved mortality in patients with left ventricular failure, already receiving an angiotensin converting enzyme inhibitor. But its role in isolated right ventricular failure has not been elucidated. The plasma arginine vasopressin levels are disproportionately elevated for the degree of serum osmolarity in patients with heart failure and result in water retention and hyponatremia. Conivaptan, a vasopressin receptor antagonist, appears to reduce body weight and improve signs of left heart failure, though there is no study to evaluate its role in right ventricular failure with edema.

This study will examine the role of spironolactone and conivaptan in patients with right ventricular failure and pathophysiology of sodium and water retention in these patients.

Eligibility


Ages Eligible for Study:	18 Years to 75 Years (Adult, Senior)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

1. Patients with World Health Organization (WHO) group 1 pulmonary arterial hypertension [51], excluding patients with portal hypertension, meeting the following hemodynamic parameters:

Mean pulmonary artery pressure (mPAP) >35 mmHg at rest, and
Pulmonary capillary wedge pressure (PCWP) <15 mmHg, and
Pulmonary vascular resistance (PVR) >1.5 wood units, and 2. Age 18 to 75 years 3. Right ventricular failure defined by right atrial pressure >7 mmHg along with either dilated right ventricle, or absence of inferior vena cava collapse or BNP >100 pg/ml 4. Patients of childbearing age must be practicing effective birth control. 5. Normal left ventricular function as assessed by echocardiogram, multiple gated acquisition (MUGA) cardiac scan, or invasive left ventriculography.

Exclusion Criteria:

1. Group 2-5 pulmonary hypertension as defined by WHO.

Pulmonary hypertension with left heart failure (as assessed by echocardiogram, multiple gated acquisition (MUGA) cardiac scan, or invasive left ventriculography).
Pulmonary hypertension associated with lung disease and/or hypoxemia (e.g. chronic obstructive pulmonary disease, interstitial lung disease, sleep disordered breathing, chronic exposure to high altitude, alveolar hypoventilation syndrome.
Pulmonary hypertension due to chronic thrombotic and/or embolic diseases
Miscellaneous such as sarcoidosis, compression of pulmonary vessels by adenopathy, tumor 2. Systemic hypertension, defined as a systolic pressure >140 mmHg or a diastolic blood pressure >90 mmHg 3. Patients taking angiotensin converting enzyme (ACE) inhibitor or angiotensin receptor blockers (ARBs) 4. Pregnancy 5. Chronic kidney disease (serum creatinine > 2.5mg/dl, proteinuria >500 mg/day, hematuria) 6. Cirrhosis or portal hypertension 7. Inability to provide informed consent. 8. Allergy to conivaptan or spironolactone. 9. Active malignancy 10. Patients receiving spironolactone 11. Enrollment in other interventional studies. 12. Patients on Highly Active Antiretroviral Therapy (HAART)

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 ClinicalTrials.gov identifier: NCT00811486

Locations


United States, Colorado
University of Colorado at Denver and Health Sciences Center General Clinical Research Center
Denver, Colorado, United States, 80262

Sponsors and Collaborators

University of Colorado, Denver

Investigators


Principal Investigator:	Shweta Bansal, MD	UCHSC

More Information


Responsible Party:	University of Colorado, Denver
ClinicalTrials.gov Identifier:	NCT00811486 History of Changes
Other Study ID Numbers:	07-1022
Study First Received:	December 18, 2008
Last Updated:	January 25, 2013

Additional relevant MeSH terms:


Hypertension Heart Failure Hypertension, Pulmonary Familial Primary Pulmonary Hypertension Vascular Diseases Cardiovascular Diseases Heart Diseases Lung Diseases Respiratory Tract Diseases Spironolactone	Conivaptan Mineralocorticoid Receptor Antagonists Hormone Antagonists Hormones, Hormone Substitutes, and Hormone Antagonists Physiological Effects of Drugs Diuretics, Potassium Sparing Diuretics Natriuretic Agents Antidiuretic Hormone Receptor Antagonists Molecular Mechanisms of Pharmacological Action

ClinicalTrials.gov processed this record on June 23, 2017