Investigation of the ALLEGRA THV System With a New Delivery System in Patients With Aortic Stenosis or Failed Surgical Bioprosthesis

Transcatheter Aortic Valve Implantation Clinical Trial

— EMPIRE  

Official title:

Investigation of the Safety and Performance of the NVT ALLEGRA THV System With a New Delivery System in Patients With Severe Calcified Aortic Stenosis or Failed Surgical Aortic Bioprosthesis

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT05478161
• Other study ID #: NVT05EMP
• Status: Active, not recruiting
• Phase: N/A
• Start date: January 24, 2023
• Est. completion date: February 2025

Study information

• Verified date: May 2024
• Source: NVT GmbH
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The EMPIRE study confirms the technical performance of the new IMPERIA Delivery System and evaluates the safety and efficacy of the entire ALLEGRA THV System. The primary endpoint is device success rate at 7 days (discharge from index procedure or 7 days post implant, whichever comes first), as defined by VARC 2. Based on the outcomes of a study with a similar device and considering a drop-out rate of 5%, 107 patients need to be enrolled in the study.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 137
• Est. completion date: February 2025
• Est. primary completion date: December 20, 2023
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Symptomatic severe calcific stenosis of a native aortic valve with an AVA =1.0 cm2 (or AVA index =0.6 cm2/m2), AND mean aortic pressure gradient = 40mmHg OR maximal transaortic velocity =4.0m/s OR Doppler velocity index =0.25 on site-reported echocardiography OR symptomatic patients with degeneration of a surgical bioprosthetic valve (stenosis +/- insufficiency) on site-reported echocardiography

2. Local multi-disciplinary Heart Team and Central Screening Committee (CSC) agree on indication and eligibility for TAVI

3. Age =18 years

4. Patient has signed the Patient Informed Consent Form

5. Patient is willing and able to comply with requirements of the study, including all follow-up visits Exclusion Criteria:

General:

1. Mean aortic annulus diameter as measured by pre-procedural CT or internal diameter of the bioprosthesis is <16.5 mm or >27 mm

2. Echocardiographic evidence of intracardiac thrombus or vegetation (site-reported)

3. Significant disease of the aorta that would preclude safe advancement of the ALLEGRA THV System

4. Severe ilio-femoral vessel disease that would preclude safe placement of an 18 Fr introducer sheath or make endovascular access impossible

5. Porcelain aorta

6. Severe left ventricular dysfunction with ejection fraction (EF) <20% (site-reported)

7. Evidence of active endocarditis or other acute infections

8. Renal failure requiring continuous renal replacement therapy

9. Untreated clinically significant coronary artery disease requiring revascularization

10. Any percutaneous interventional procedure (e.g. PCI with stenting) within 14 days prior of the index procedure

11. Acute MI =30 days prior to the index procedure

12. Symptomatic carotid or vertebral artery disease requiring intervention or carotid/vertebral intervention within the preceding 45 days

13. Cerebrovascular accident (CVA) or transient ischemic attack (TIA) =6 months or prior CVA with moderate or severe disability (e.g. modified Rankin scale score >2)

14. History of bleeding diathesis or coagulopathy; acute blood dyscrasias as defined:

thrombocytopenia (platelets <80,000/µl), acute anemia (hemoglobin <10 g/dl), leukopenia (WBC <3000/ µl)

15. Active peptic ulcer or gastrointestinal (GI) bleeding =3 months

16. Severe (greater than 3+) mitral insufficiency (site-reported)

17. Uncontrolled atrial fibrillation

18. Required emergency surgery for any reason

19. Known hypersensitivity to contrast media, which cannot be adequately pre-medicated or contraindication to anticoagulant or anti-platelet medication or to nitinol alloy or to bovine tissue

20. Life expectancy =12 months due to other medical illness

21. Currently participating in another investigational drug or device study

22. Pregnancy or intend to become pregnant during study participation

Specific exclusions in patients with native aortic valve disease (site-reported):

23. Unicuspid or bicuspid aortic valve

24. Non-calcified aortic stenosis

25. Predominant aortic regurgitation > grade 3

26. Distance between native aortic valve basal plane and the orifice of the lowest coronary artery <8 mm Specific exclusions in patients with degenerated surgical bioprosthetic aortic valves

(valve-in-valve) (site-reported):

27. Low position of the coronary ostia, especially in combination with shallow sinuses (high risk of coronary occlusion)

28. Partially detached leaflets that may obstruct a coronary ostium

Related Conditions & MeSH terms

• Aortic Valve Stenosis
• Constriction, Pathologic
• Transcatheter Aortic Valve Implantation

Intervention

Device:
• (ALLEGRA Transcatheter Heart Valve) TAVI in severe calcified aortic stenosis or in failed surgical aortic bioprosthesis
Implantation of the ALLEGRA Transcatheter Heart Valve in failing surgical bioprosthesis

Locations

Country	Name	City	State
Germany	Schüchtermann Klinik	Bad Rothenfelde	Niedersachsen
Spain	Hospital Alvaro Cunqueiro	Vigo

Sponsors (1)

Lead Sponsor	Collaborator
NVT GmbH

Countries where clinical trial is conducted

Germany,  Spain, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Device success at 7 days	Absence of procedural mortality AND; Correct positioning of a single device in the proper anatomical location (site-reported) AND; Intended performance of the prosthetic heart valve (as determined by an independent Echo Core Lab at discharge from index procedure or 7 days post implant, whichever comes first); Indexed Effective Orifice Area (iEOA) > 0.85 cm2/m2 for BMI < 30kg/m2 and iEOA > 0.70 cm2/m2 for BMI = 30kg/m2; Mean aortic valve gradient <20 mmHg or peak velocity <3 m/s; No moderate or severe prosthetic valve regurgitation	7 day
Secondary	All-cause mortality		up to 12 months
Secondary	Cardiovascular mortality		up to 12 months
Secondary	All stroke		up to 12 months
Secondary	TIA		up to 12 months
Secondary	Procedural success	Successful vascular access, delivery and deployment of the ALLEGRA THV including re- positioning if required and successful retrieval of the IMPERIA Delivery System (site- reported); Correct position of the ALLEGRA THV (site-reported); Only one ALLEGRA THV implanted in proper anatomical position (site-reported)	assessed immediately after the procedure
Secondary	Effective orifice area (EOA) as assessed by transthoracic echocardiogram (TTE)		up to 12 months
Secondary	Transvalvular mean and peak pressure gradient as assessed by transthoracic echocardiogram (TTE)		up to 12 months
Secondary	Trans- and paravalvular regurgitation as assessed by transthoracic echocardiogram (TTE)		up to 12 months
Secondary	NYHA classification		30 days, 6 months, and 12 months
Secondary	Early safety	All-cause mortality; All stroke (disabling and non-disabling); Life-threatening bleeding; Acute kidney injury-Stage 2 or 3 (including renal replacement therapy); Coronary artery obstruction requiring intervention; Major vascular complication; Valve-related dysfunction requiring repeat procedure (BAV, TAVI, or SAVR)	up to 30 days
Secondary	Time-related valve safety	Structural valve deterioration; Valve-related dysfunction (mean aortic valve gradient; 20 mmHg, EOA =0.9-1.1 cm2c and/or DVI <0.35 m/s, AND/OR moderate or severe prosthetic valve regurgitation); Requiring repeat procedure (TAVI or SAVR); Prosthetic valve endocarditis; Prosthetic valve thrombosis; Thrombo-embolic events (e.g. stroke); VARC bleeding, unless clearly unrelated to valve therapy (e.g. trauma)	up to 12 months
Secondary	Quality of life as assessed using the Kansas City Cardiomyopathy Questionnaire (KCCQ-12)	Assessed with the Kansas City Cardiomyopathy Questionnaire (KCCQ-12). Patients are asked questions about physical limitation, symptom frequency, quality of life, and social limitation. Responses are given on a Likert scale that for each individual item is scored on a scale of 0-100 with higher scores indicating better health.	up to 12 months
Secondary	New pacemaker implantation		up to 12 months
Secondary	Delivery system related AEs		discharge from index procedure or 7 days post implant, whichever comes first