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NIH-developed technique prevents obstruction in heart valve replacement

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Posted June 13, 2019

A novel technique has proven successful in preventing coronary artery obstruction during transcatheter aortic valve replacement (TAVR), a rare but often fatal complication. Called Bioprosthetic Aortic Scallop Intentional Laceration to prevent Iatrogenic Coronary Artery obstruction (BASILICA), the technique will increase treatment options for high-risk patients who need heart valve procedures. The findings by researchers at the National Institutes of Health will be published in the Journal of the American College of Cardiology: Cardiovascular Interventions.

TAVR, a procedure used to treat aortic valve stenosis, involves threading a long, thin, flexible tube, called a catheter, through the femoral artery in the leg to the heart. Aortic valve stenosis is a narrowing of the valve controlling blood leaving the heart to the rest of the body. This narrowing reduces blood flow to vital organs, resulting in shortness of breath, chest pain, blackouts, and heart failure.

For elderly or frail patients, TAVR offers an effective and less invasive alternative to open heart surgery. However, a small subset of these patients may develop coronary artery obstruction during the TAVR procedure. For more than half of these patients, this complication has been fatal.

During TAVR, the surgeon places a catheter inside the heart and uses a balloon to open a new valve inside the aortic valve. However, in some patients whose hearts have uncommon structures, such as unusually large valve leaflets or small aortic roots, the large leaflets block the flow of blood to the coronary arteries as the new valve’s scaffolding opens.

BASILICA was developed at the National, Heart, Lung, and Blood Institute (NHLBI), part of NIH, to offer a solution to the problem of coronary obstruction during TAVR and increase the safety of TAVR for this subset of patients. The interventional cardiologist weaves an electrified wire the size of a sewing thread through a catheter and uses it to split the original leaflet in two so that it cannot block the coronary artery once it has been pushed aside by the transcatheter heart valve.

After animal experiments proved promising, the researchers successfully performed the procedure on seven patients who qualified for compassionate use of the technique — then untested in humans — because no other care options were available.

The current research builds on the success of the first-in-human trial. From February to July 2018, the BASILICA technique was evaluated in a multicenter early feasibility study, sponsored by NHLBI. It enrolled 30 gravely ill patients who were at high or extreme risk if undergoing surgery.

According to the researchers, all patients survived the procedure and underwent a successful TAVR. BASILICA was successful in 93% of patients and was feasible in natural as well as prosthetic aortic valves. At the 30 days mark, there were no coronary artery obstructions, nor a need to repeat the procedure due to valve dysfunction.

Every year, approximately 5 million people in the United States are diagnosed with heart valve disease, and more than 20,000 die, according to the American Heart Association.

Source: NIH

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