Cilostazol for HFpEF

Study Overview
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Brief Summary
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Determine if cilostazol improves symptoms and NTproBNP levels (heart failure blood marker) in heart failure with preserved ejection fraction (HFpEF) - a prevalent syndrome without targeted evidence-based treatment. This will be assessed in a prospective 1-month single blinded study with 2 cross-overs n-of-1 study design with placebo and cilostazol

Detailed Description
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Heart failure (HF) is the #1 reason for hospital admissions. About half of the patients with HF have a preserved ejection fraction (HFpEF). There is no targeted evidence-based treatment for HFpEF. We recently reported that elevating the heart rate with pacemakers conveys clinical benefits e.g. reduction in heart failure symptoms, lowering filling pressures and an increase in walk distance. Cilostazol is a PDE3 inhibitor that increases the heart rate by about 5-8 beats per minute and has other potentially beneficial HFpEF effects such as peripheral vasodilation, lusitropic effects and dromotropic effects. By activating proteinkinase A, cilostazol may also phosphorylate titin, which may reduce myocardial stiffness. n-of-1 study design using the standard dose cilostazol formulation of 100mg twice a day approved for peripheral vascular disease. The investigators and patients are blinded. The patients serve as their own controls with two crossovers (Week 1: cilostazol or placebo - Week 2: placebo or cilostazol - Week 3: cilostazol or placebo - Week 4: placebo or cilostazol).

Official Title
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Cilostazol for HFpEF (Heart Failure With a Preserved Ejection Fraction)

Conditions
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Heart Failure With Preserved Ejection Fraction

Intervention / Treatment
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* Drug: Cilostazol 100Mg Tab
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: >18 yrs LVEF ≥ 50% (on last assessment, <2 years) Diagnosis of HFpEF or Shortness of breath with NYHA Class ≥ 2 and one of the following: pulmonary edema on chest imaging or documented on exam or on loop diuretics NTproBNP >400 ng/ml in the last 24 months HFpEF>50% hospitalization in the last 3 years Qualitative echo: > mild diastolic dysfunction on echo report and > mild left ventricular hypertrophy and left atrial dilation or quantitative echo: left ventricular hypertrophy [men ≥115 g/m², women ≥95 g/m² or relative wall thickness >0.42 or any LV wall thickness >1.2cm and has LA dilation (>28ml/m2) Exclusion Criteria: <18yo resting heart rate >100/min patients with LVEF <50% advanced end-stage heart failure, symptomatic COPD on home O2, uncontrolled severe HTN (SBP >160/100 mmHg) patients with life expectancy <6 months, end-stage liver cirrhosis, more than moderate valve disease, infiltrative myocardial disease constrictive pericarditis or myocarditis, patients unable to participate in follow up, pregnant patients or patients without reliable contraceptive agent for the duration of study participation), left ventricular outflow tract obstruction, bleeding dyscrasias, blood dyscrasias, Patients on oral ketoconazole, itraconazole, fluconazole, miconazole, fluvoxamine, fluoxetine, nefazodone, sertraline, erythromycin, clarithromycin or azithromycin

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Interventional Model Description: n-of-1 design
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Cilostazol<br>First week, Cilostazol 100mg twice a day Second week, Placebo twice a day Third week, Cilostazol 100mg twice a day Forth week, Placebo twice a day | Drug: Cilostazol 100Mg Tab<br>* Cilostazol Twice a Day<br>Drug: Placebo<br>* Placebo<br>|
| Other: Placebo<br>First week, Placebo twice a day Second week, Cilostazol 100mg twice a day Third week, Placebo twice a day Forth week, Cilostazol 100mg twice a day | Drug: Cilostazol 100Mg Tab<br>* Cilostazol Twice a Day<br>Drug: Placebo<br>* Placebo<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| KCCQ-12 | The Kansas City Cardiomyopathy Questionnaire contains 12 items that measure the effect of heart failure on health and quality of life. Total scores are scaled from 0 to 100 and frequently summarized in 25-point ranges, where scores represent health status as follows: 0 to 24: very poor to poor; 25 to 49: poor to fair; 50 to 74: fair to good; and 75 to 100: good to excellent | 4 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| NTproBNP | Blood marker of heart failure severity [pg/mL], average of 2 time points 1st and 3rd week | 1st and 3rd week |