Developing Oral LT3 Therapy for Heart Failure - HFpEF

Study Overview
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Brief Summary
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Investigation of the safety, feasibility, and preliminary efficacy of thyroid hormone therapy with Liothyronine (LT3) in individuals with heart failure with preserved ejection fraction (HFpEF) and low triiodothyronine (T3) syndrome by conducting a randomized, double-blind, placebo-controlled cross-over study with a two-week washout period between treatments.

Detailed Description
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The overall goal is to determine the safety, feasibility, and preliminary efficacy of administering oral LT3 therapy in the study population of participants with Heart Failure with preserved ejection fraction (HFpEF). Each treatment period will be approximately 8 weeks in duration, with weekly titration of study drug for 4 weeks, followed by a maintenance dose for 4 weeks, then 2-week washout before crossing over to the other arm (placebo or drug). LT3 will be titrated to T3 levels.

Official Title
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Developing Oral LT3 Therapy For Heart Failure With Preserved Ejection Fraction

Conditions
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Heart Failure With Preserved Ejection Fraction, Low Triiodothyronine Syndrome

Intervention / Treatment
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* Drug: liothyronine or placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Men and women aged ≥18 years; NYHA Class I, II or III heart failure or dyspnea on exertion without a clinically identifiable alternative cause; left ventricular ejection fraction greater than or equal to 40 percent; if taking antihypertensive medications, beta-blockers, SGLT2inhibitors, sacubitril/valsartan, or aldosterone antagonists, doses must be stable for at least 30 days. Elevated filling pressures as evidenced by at least 1 of the following: Mitral E/e' ratio > 14 (either lateral or septal) Mitral E/e' ratio > 8 (either lateral or septal), with low e' velocity (septal e'<7 cm/sec or lateral e'< 10 cm/sec), in addition to one of the following: Enlarged left atrium (LA volume index >34 ml/m2) Chronic loop diuretic use for control of symptoms Elevated natriuretic peptides (BNP levels >100 ng/L or NT-proBNP levels >300 ng/L) Tricuspid regurgitation velocity >2.8 m/s Elevated invasively-determined filling pressures previously (resting LVEDP >16 mmHg or mean pulmonary capillary wedge pressure [PCWP] >12 mmHg; or PCWP/LVEDP ≥25 mmHg with exercise) Acute heart failure decompensation with radiographic evidence of pulmonary venous congestion or alveolar edema, requiring IV diuretics within the past year Probability of HFpEF>90%according to the HFpEF score,without a more likely apparent cause for symptoms as per Investigator assessment. TSH and free T4 level within the protocol specified reference range and total T3 level less than or equal to 0.94 ng/dL; if taking oral estrogen, dose must remain stable for duration of study participation. Exclusion Criteria: Hypertrophic or restrictive cardiomyopathy or uncorrected severe primary valvular disease; inability to perform VO2max exercise testing; severe lung disease; treatment with oral steroids within past 6 months for an exacerbation of obstructive lung disease, or the use of daytime oxygen; serum creatinine > 3.0 mg/dL; history of cirrhosis; acute coronary syndrome or coronary artery intervention or ablation therapy within past 2 months; cardiac surgery or percutaneous valve or septal defect repair within the past 6 months; heart failure hospitalization within past month; taking thyroid extract, LT4, LT3, amiodarone, or medication that affects the absorption or metabolism of thyroid hormone; gastrointestinal conditions that affect the absorption of thyroid hormone; current or planned pregnancy within the timeframe of study participation; any medical condition that, in the opinion of the investigator, will interfere with safe completion of the study. -

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
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Liothyronine (LT3)<br>Liothyronine (L-triiodothyronine or LT3) in the 5 mcg tablet dose formulation. Minimum LT3 dose will be 2.5 mcg three times daily and the maximum LT3 dose will be 12.5 mcg three times daily. | Drug: liothyronine or placebo<br>* Each treatment period of liothyronine or placebo will be approximately 8 weeks in duration, with weekly titration of study drug for four weeks, followed by a maintenance dose for 4 weeks, then 2-week washout before crossing over to receive the alternate therapy - placebo or LT3.<br>* Other names: LT3;|
| Placebo Comparator: Placebo<br>A placebo tablet matching in appearance to LT3 tablets, dosed equivalently. Minimum placebo tablet dose will be 1/2 tablet (2.5 mcg equivalent) three times daily and the maximum placebo dose will be 2 1/2 tablets (12.5 mcg equivalent) three times daily. | Drug: liothyronine or placebo<br>* Each treatment period of liothyronine or placebo will be approximately 8 weeks in duration, with weekly titration of study drug for four weeks, followed by a maintenance dose for 4 weeks, then 2-week washout before crossing over to receive the alternate therapy - placebo or LT3.<br>* Other names: LT3;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cardiac Rhythm Monitoring by 14 day Patch Rhythm Assessment | Percent increase (atrial fibrillation, ventricular tachycardia, supraventricular and ventricular) ectopy | continuous during intervention (14 days) | 
| T3 Level | Percentage of participant T3 levels above upper limit of reference range | 8 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Peak Maximal Rate of Oxygen Consumption During Exercise (VO2 Max) | Change peak rate of oxygen consumption | 8 weeks | 
| Measure of Quality of Life | Change Kansas City Cardiomyopathy Questionnaire, KCCQ | 8 weeks | 
| Actigraphy | Change in remotely sensed difference in counts per minute (CPM) | 8 weeks | 
| NT-proBNP Levels | Change in B-type natriuretic peptide, Pg/mL | 8 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Heart Failure, HFpEF, Low T3 Syndrome