One-Year Results from Real-World Study Showed Abbott's Portico™ Transcatheter Aortic Valve Safely and Successfully Reduced Severe Aortic Stenosis

SAN DIEGO, Sept. 25, 2018 /PRNewswire/ -- Abbott (NYSE: ABT) today announced one-year results from a real-world, international, multicenter, 941-patient study of the company's Portico™ transcatheter aortic valve replacement (TAVR) system in patients with symptomatic, severe aortic stenosis – a life-threatening narrowing of the heart's aortic valve. At one year, implantation with the Portico valve was safe and associated with low rates of stroke, death and leaks between patients' natural heart tissue and the Portico valve.  

The one-year results from the PORTICO I study were presented during a late-breaking session at the 30th Transcatheter Cardiovascular Therapeutics (TCT), the annual scientific symposium of the Cardiovascular Research Foundation in San Diego, and simultaneously published in the Journal of the American College of Cardiology. Results at one year were consistent with 30-day results reported earlier this year; with data used to support CE Mark; and with data and results from other commercially available TAVR valves. Portico is under investigation in the United States. 

The Portico transcatheter valve is a minimally invasive alternative to surgical aortic valve replacement for patients diagnosed with severe aortic stenosis who are high-risk candidates for open-heart surgery. Aortic stenosis is a common and life-threatening valve disease in which the aortic valve opening in the heart narrows and restricts blood flow from the left ventricle to the aorta. More than one in eight people aged 75 and older have moderate or severe aortic stenosis,[1] which reduces the heart's pumping ability. Most patients don't have symptoms for decades, but once symptoms appear, the prognosis is poor without surgical treatment,[2] manifesting in shortness of breath, fatigue, and ultimately heart failure.[3]

"Portico offers physicians the ability to safely and successfully treat patients suffering from symptomatic, severe aortic stenosis with a high level of confidence," said Lars Sondergaard, M.D., DMSc, Rigshospitalet, Copenhagen, Denmark and principal investigator of the study. "These one-year results in a real-world setting give us assurance that Portico is an excellent and important treatment option for patients with severe aortic stenosis who are at increased risk for open-heart surgery."

In this study, at one year, patients who received a Portico valve had low rates of mortality, stroke, paravalvular leak, and sustained significantly improved hemodynamic performance. All-cause and cardiovascular mortality were 12.1 percent and 6.6 percent, respectively; disabling stroke was observed in 2.2 percent of patients and myocardial infarction in 2.5 percent. Mean aortic valve area increased from baseline (0.72 ± 0.37 cm²) to 30 days (1.79 ± 0.48 cm²) and was durable at one year (1.74 ± 0.49 cm²). Moderate paravalvular leak was low, decreasing from 3.9 percent of patients at 30 days to 2.6 percent of patients at one year. The proportion of patients classified with severe heart failure (NYHA Class III/IV[4]) decreased from 63.8 percent at baseline to 7.7 percent at one year.

"These real-world data demonstrate that Portico is safe and performs as intended to help patients suffering from severe aortic stenosis," said Neil Moat, M.D., chief medical officer of Abbott's structural heart business. "Portico reduces the need for open-heart surgery to replace an aortic valve, and is an important part of Abbott's mission to provide life-changing technologies to treat people with structural heart diseases."

The PORTICO I trial is an ongoing, prospective, long-term study of patients with symptomatic, severe aortic stenosis treated with the self-expanding, repositionable Portico transcatheter aortic valve via a transfemoral access. The primary endpoint is all-cause mortality at one year. Secondary endpoints include device performance, improvement in functional capacity, and adverse event rates at 30 days, one year, and annually thereafter, for five years. The study is evaluating 941 patients treated between April 2013 and September 2017 at 61 sites across 14 countries in Europe, Australia and Canada.

Abbott recently received regulatory approval in Europe for a sheathless introduction of the Portico valve, which makes it easier for doctors to use the valve in patients with severe disease and complex anatomies. The small, sheathless profile may lower the risk of serious adverse events and vascular complications such as internal damage to the arteries.[5],[6],[7],[8]

Abbott received CE Mark for Portico in 2012, and has completed enrollment in the randomized treatment arm of a U.S. pivotal study.

The Portico Transcatheter Aortic Valve is approved for investigational use only in the U.S.

About Abbott:
At Abbott, we're committed to helping people live their best possible life through the power of health. For more than 125 years, we've brought new products and technologies to the world — in nutrition, diagnostics, medical devices and branded generic pharmaceuticals — that create more possibilities for more people at all stages of life. Today, 99,000 of us are working to help people live not just longer, but better, in the more than 150 countries we serve.

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[1]  Nkomo VT, Gardin JM, Skelton TN, et al. Burden of valvular heart diseases: a population-based study. Lancet 2006;368:1005-11
[2] Nardi P, Russo M, Saitto G, et al. The Treatment of Aortic Valve Stenosis in Patients at Intermediate-High Risk. Interv Cardiol J. 2016, 2:2. 
[3] Osnabrugge RLJ, Mylotte D, Head SJ, et al; Aortic Stenosis in the Elderly: Disease Prevalence and Number of Candidates for Transcatheter Aortic Valve Replacement: A Meta-Analysis and Modeling Study. Journal of the American College of Cardiology. 2013; 11:1002-1012.
[4] https://www.heart.org/en/health-topics/heart-failure/what-is-heart-failure/classes-of-heart-failure 
[5]  Taramasso et al. "Feasibility and safety of Transfemoral Sheathless Portico Aortic Valve Implantation." Catheter Cardiovasc Interv. 2017 May 13. doi: 10.1002/ccd.271005.   
[6] Bruschi et al. "Portico Sheathless Transcatheter Aortic Valve Implantation via Distal Axillary Artery." Ann Thorac Surg. 2017 Feb;103(2):e175-e177. doi: 10.1016/j.athoracsur.2016.07.065
[7] Denegri et al. "Real-world procedural and 30-day outcome using the Portico transcatheter aortic valve prosthesis:" Int J Cardiol. 2018 Feb 15;253:40-44. doi: 10.1016/j.ijcard.2017.10.101. Epub 2017 Nov 10
[8] Taramasso M. Feasibility and Safety of Transfemoral Sheathless Portico Aortic Valve Implantation: Prelimary Results in a Single Center Experience Catheterization and Cardiovascular Interventions 91:533–539 (2018).

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