Vasodilator Therapy for Heart Failure and Preserved Ejection Fraction
| Status: | Completed |
|---|---|
| Conditions: | Cardiology |
| Therapuetic Areas: | Cardiology / Vascular Diseases |
| Healthy: | No |
| Age Range: | 18 - Any |
| Updated: | 4/17/2018 |
| Start Date: | January 2012 |
| End Date: | March 2018 |
Effect of Organic Nitrates and Hydralazine on Wave Reflections and Left Ventricular Structure and Function in Heart Failure With Preserved Ejection Fraction
The main objective is to test the effect of prolonged therapy (24 weeks) with isosorbide
dinitrate ± hydralazine on arterial wave reflections (primary endpoint). Secondary endpoints
include left ventricular (LV) mass, fibrosis and diastolic function) and exercise capacity
(assessed via the 6-minute walk test) in patients with Heart Failure and Preserved Ejection
Fraction (HFPEF). We will also test the hypothesis that the reduction in arterial wave
reflections induced by vasoactive therapy will correlate with the improvement in exercise
capacity, LV mass, fibrosis and diastolic function. Finally, we will assess whether the
hemodynamic response to an acute dose of sublingual nitroglycerin (NTG) can predict the
sustained changes in the reflected wave and other hemodynamic parameters in response to
chronic vasodilator therapy.
dinitrate ± hydralazine on arterial wave reflections (primary endpoint). Secondary endpoints
include left ventricular (LV) mass, fibrosis and diastolic function) and exercise capacity
(assessed via the 6-minute walk test) in patients with Heart Failure and Preserved Ejection
Fraction (HFPEF). We will also test the hypothesis that the reduction in arterial wave
reflections induced by vasoactive therapy will correlate with the improvement in exercise
capacity, LV mass, fibrosis and diastolic function. Finally, we will assess whether the
hemodynamic response to an acute dose of sublingual nitroglycerin (NTG) can predict the
sustained changes in the reflected wave and other hemodynamic parameters in response to
chronic vasodilator therapy.
Inclusion Criteria:
1. Previous clinical diagnosis of heart failure with current New York Heart Association
Class II-IV symptoms.
2. LV ejection fraction >50% on a clinically indicated echocardiogram or ventriculogram
within 12 months prior to consent, in the absence of a change in cardiovascular
status, as assessed by the principal investigators.
3. Must have had at least one of the following within the 12 months prior to consent
1. Hospitalization for decompensated HF
2. Acute treatment for HF with intravenous loop diuretic or hemofiltration.
3. Chronic treatment with a loop diuretic for control of HF symptoms.
4. Chronic diastolic dysfunction on echocardiography as evidenced by left atrial
enlargement or at least stage II diastolic dysfunction.
5. Documentation of elevated NT-pro BNP levels or other natriuretic peptide marker
(BNP, ANP) according to the laboratory and assay upper limit of normal in the
previous year.
4. Stable medical therapy as defined by:
1. No addition or removal of ACE, ARB, beta-blockers, or calcium channel blockers
(CCBs) for 30 days.
2. No change in dosage of ACE, ARBs, beta-blockers or CCBs of more than 100% for 30
days.
3. No change in diuretic dose for 10 days.
Exclusion Criteria:
1. Rhythm other than sinus rhythm (i.e., atrial fibrillation).
2. Neuromuscular, orthopedic or other non-cardiac condition that prevents patient from
walking in a hallway.
3. Non-cardiac condition limiting life expectancy to less than one year, per physician
judgment.
4. Current or anticipated future need for nitrate therapy.
5. Valve disease (> mild aortic or mitral stenosis; > moderate aortic or mitral
regurgitation).
6. Hypertrophic cardiomyopathy.
7. Known infiltrative or inflammatory myocardial disease (amyloid, sarcoid).
8. Pericardial disease.
9. Primary pulmonary arteriopathy.
10. Have experienced a myocardial infarction or unstable angina, or have undergone
percutaneous transluminal coronary angiography (PTCA) or coronary artery bypass
grafting (CABG) within 60 days prior to consent, or requires either PTCA or CABG at
the time of consent.
11. Other clinically important causes of dyspnea such as morbid obesity or significant
lung disease defined by clinical judgment or use of steroids or oxygen for lung
disease.
12. Systolic blood pressure < 110 mmHg or > 180 mm Hg.
13. Diastolic blood pressure < 40 mmHg or > 100 mmHg.
14. Resting heart rate (HR) > 100 bpm.
15. A history of reduced ejection fraction (EF<50%).
16. Severe renal dysfunction (estimated GFR <30 ml/min/1.73m2 by modified MDRD equation)
GFR (mL/min/1.73 m2) = 175 x (Scr)-1.154 x (Age)-0.203 x (0.742 if female) x (1.210 if
African American) (conventional units), which would impede the safe administration of
gadolinium for MRI studies contrast.
17. Hemoglobin <10 g/dL.
18. Patients with known severe liver disease (AST > 3x normal, alkaline phosphatase or
bilirubin > 2x normal).
19. Patients with a clinically indicated stress test demonstrating significant ischemia
within a year of enrollment which was not followed by percutaneous or surgical
revascularization.
20. Listed for cardiac transplantation.
21. Allergy to isosorbide dinitrate or hydralazine.
22. Current therapy with phosphodiesterase inhibitors, such as sildenafil, vardenafil or
tadalafil, since the combination of nitrates and phosphodiesterase inhibitors can
result in severe hypotension.
23. We will also exclude patients who are not suitable candidates for a cardiac MRI by
virtue of having the following absolute or relative contraindications: (i) Central
nervous system aneurysm clips; (ii) Implanted neural stimulators; (iii) Implanted
cardiac pacemaker or defibrillator; (iv) Cochlear implant; (v) Ocular foreign body
(e.g. metal shavings); (vi) Other implanted medical devices: (e.g. drug infusion
ports); (vii) Insulin pump; (viii) Metal shrapnel or bullet; (ix) Claustrophobia; (x)
Extreme obesity rendering the patient unable to fit into narrow-bore scanners; (xi)
Unwillingness of the patient to undergo a cardiac MRI. All patients with metallic
implants will be individually evaluated prior to MRI.
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