Effect of GS-6615 on Exercise Capacity in Subjects With Symptomatic Hypertrophic Cardiomyopathy


About this study

This study will evaluate the effect of GS-6615 on exercise capacity, quality of life, and safety and tolerability of GS-6615 in participants with symptomatic hypertrophic cardiomyopathy (HCM).

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Established diagnosis of hypertrophic cardiomyopathy defined by standard criteria as a maximal left ventricular wall thickness ≥ 15 mm at initial diagnosis
  • Exertional symptoms including at least one of the following:
    • New York Heart Association (NYHA) Class ≥ II dyspnea
    • Canadian Cardiovascular Society (CCS) Class ≥ II angina
  • Screening (baseline) peak VO2 < 80% of predicted for age, sex, and weight
  • Ability to perform an upright treadmill cardiopulmonary exercise test (CPET)

Exclusion Criteria:

  • Known aortic valve stenosis (moderate or severe)
  • Known coronary artery disease
  • Left ventricular systolic dysfunction (ejection fraction < 50%)
  • Recent septal reduction procedure (ie, surgical myectomy or alcohol septal ablation) within six months prior to screening or such a procedure scheduled to occur during the study

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

Michael Ackerman, M.D., Ph.D.

Closed for enrollment

More information


  • Hypertrophic cardiomyopathy (HCM) is the most common inherited cardiac disorder, with an overall prevalence of at least 1:500 in the adult population although only a fraction of affected patients come to clinical recognition. It is also the most common cause of sudden cardiac death in young adults and a major cause of morbidity caused by chronic heart failure symptoms. However, more than half a century since the original description of the disease, there is no currently approved therapy for the treatment of patients with HCM, and to date there have been only 5 randomized studies of medical therapies in HCM. As such, unmet medical need in HCM has been highlighted by the National Heart, Lung, and Blood Institute (NHLBI) as a research priority. Encouragingly, the infrastructure needed to conduct rigorous clinical trials in HCM has recently emerged because of the heightened awareness and understanding of the disease, development of clinical centers of excellence, and advances in diagnostic imaging. In this article, we will discuss the complex pathophysiology of HCM, review the current therapeutic landscape, describe new mechanistic insights into the central role of the late sodium current in HCM, and introduce the scientific rationale and execution of the Impact of Late Sodium Current Inhibition on Exercise Capacity in Subjects with Symptomatic Hypertrophic Cardiomyopathy (LIBERTY-HCM) trial, the largest randomized, double-blind, placebo controlled clinical trial, now underway, designed to evaluate the effect of a novel pharmacological approach in patients with symptomatic HCM. Read More on PubMed

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