- First implantation of interatrial shunt device (IASD) is a success.
- IASD is a non-surgical device that provides continuous decompression of the left atrium of the heart.
- Implantation of IASD reduces the symptoms and progression of heart failure.
First implantation of new heart device
The first implantation of a new device called interatrial shunt device (IASD) is a success. This device is developed by Corvia Medical. The device is a non-surgical device that provides continuous decompression of the left atrium of the heart.
"This device represents a novel therapy for diastolic heart failure, a condition characterized by lifestyle-limiting breathlessness, and one in which traditional heart failure therapies have not proven effective. If the initial experience is substantiated through ongoing clinical trials, this interatrial shunt device may be an opportunity to improve quality of life and exercise capacity for patients that currently have few other options," Lilly said.
New device reduces pulmonary capillary wedge pressure
Researchers reported that the interatrial shunt device reduced pulmonary capillary wedge pressure (PCWP) readings by 3.5 mmHg, compared to a reduction of 0.5 mmHg in the control group.
The study randomized 44 DHF patients at multiple centers nationwide. Participants received either the treatment device or a sham procedure. After one month, patients were evaluated by comparing pulmonary capillary wedge pressure (PCWP) readings during right heart catheterization exercise. Elevated PCWP readings indicate failure of the left ventricle.
Diastolic heart failure (DHF)
Diastolic heart failure (DHF) occurs when the heart muscle becomes stiff and doesn't relax enough to allow blood to flow from the lungs into the heart. This causes blood to back up in the lower left chamber, then the upper left chamber and into the lungs, causing shortness of breath.
Risk factors for DHF include high blood pressure, diabetes, obesity and age. Kahwash said it's estimated that within the next five years, DHF will account for more than half of all heart failure cases, and be responsible for more hospital admissions than systolic heart failure.
"The therapies we use for people with systolic heart failure don't work as well for people with DHF. For decades, we've only been able to manage the symptoms of DHF with diuretics," said Dr. Rami Kahwash, an advanced heart failure cardiologist and director of the Heart and Vascular Research Organization at Ohio State Ross Heart Hospital.
Kahwash and Dr. Scott Lilly, an interventional cardiologist and director of the Structural Heart Disease Program at Ohio State, were part of the Phase II study that evaluated a dime-size implant intended to relieve the high pressure created by blood backing up from the heart into the lungs. During a heart catheterization, doctors inserted the tiny, interatrial shunt device in an opening they created between the upper left and right chambers. This diverts some of the blood from the high pressure left atrial chamber to the low-pressure right atrial chamber, much like a detour around a traffic jam.
- Ted Feldman, Laura Mauri, Rami Kahwash et al. A Transcatheter InterAtrial Shunt Device for the Treatment of Heart Failure with Preserved Ejection Fraction (REDUCE LAP-HF I): A Phase 2, Randomized, Sham-Controlled Trial, Circulation https:doi.org/10.1161/CIRCULATIONAHA.117.032094