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Home » Drug May Improve Cardiac Function in Hypertrophic Cardiomyopathy
Clinical Breakthroughs

Drug May Improve Cardiac Function in Hypertrophic Cardiomyopathy

By Melissa RohmanNov 16, 2021
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Philip Thrush, MD, ’13 GME, associate professor of Pediatrics in the Division of Cardiology, was a co-author of the clinical trial published in Nature Medicine.

Valsartan, an angiotensin II receptor blocker drug, delayed disease progression and improved cardiac structure and function in patients with early-stage hypertrophic cardiomyopathy, according to results from a recent clinical trial published in Nature Medicine.

“This is the first time we have identified a treatment that may actually impact the underlying disease process, as opposed to just treating symptoms. In addition, if we can delay disease progression, this may ultimately mean that we can significantly impact the risk of sudden cardiac death in this population,” said Philip Thrush, MD, ’13 GME, associate professor of Pediatrics in the Division of Cardiology and a co-author of the study.

Hypertrophic cardiomyopathy is characterized by an abnormal thickening of the heart muscle. The disease results from mutations in the genes that code for sarcomeres, protein filaments that are essential for proper contraction of the heart muscle.

While most patients are asymptomatic, the disease is characterized by left ventricular hypertrophy (when the heart’s left ventricle is unable to pump blood properly), myocardial fibrosis (scarring within the heart muscle) and an increased risk of heart failure and arrythmias.

Current treatments for the disease only address its symptoms and aim to slow or regulate the patient’s heart rate. Therefore, therapies that slow disease progression and address its underlying causes are greatly needed, and the drug valsatran, an angiotensin II receptor blocker, had been suggested as a solution to prevent the development of hypertrophy altogether.

Previous work had demonstrated that a similar angiotensin II receptor drug prevented the development of hypertrophy when given to mouse models with early-stage disease, suggesting that valsartan may also be an effective treatment.

In the current clinical trial, more than 170 participants between the ages of 8 and 45 years old who were diagnosed with early-stage hypertrophic cardiomyopathy were randomized to receive either valsartan or a placebo for two years. Participants were followed up at the one- and two-year mark for changes in certain cardiovascular features, including left ventricular wall thickness, mass and volume.

Overall, participants in the valsartan group demonstrated improved cardiac structure and function compared to the placebo group. The drug was also well-tolerated by participants, according to the authors, encouraging further investigation into the drug’s long-term effects and determining the optimal time to administer the drug to patients.

“While we know it is beneficial to start it early, we don’t know how early is beneficial,” Thrush said. “We have many children and young adults who are known carriers of familial disease-causing mutations but continue to have normal echocardiograms, ECGs and even cardiac MRIs, so it can be challenging to generalize these findings to a completely asymptomatic population. This is certainly challenging with such a rare disease, but as a field we owe it to these patients to push the boundaries of medicine.”

This work was funded by National Heart, Lung, and Blood Institute grant P50HL112349.

Cardiology Patient Care Research
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