Clinical trial NCT00677014: Comparison of AV Optimization Methods Used in Cardiac Resynchronization Therapy (CRT)
Official title: SMARTDELAY Determined AV Optimization: A Comparison to Other AV Delay Methods Used in Cardiac Resynchronization Therapy
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE4
Conditions: Heart Failure
Keywords: Heart Failure
HF
Cardiac Resynchronization Therapy
CRT
Optimization
SmartDelay
Echocardiography
AV Delay
Lead sponsor: Boston Scientific Corporation
Sponsor class: INDUSTRY
First posted: 2008-05-13
Enrollment: 1060
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The primary objective of SMART-AV is to assess the effect of SmartDelay for determining optimal AV delay timing during CRT compared to both a fixed AV delay and echocardiography-determined optimal AV timing chronically over a 6-month period.

Detailed description: SMART-AV is a randomized, multi-center, double-blinded, non-significant risk, three-armed trial that will investigate the effects of optimizing AV delay timing in heart failure patients receiving CRT-D therapy. Patients will be randomized in a 1:1:1 ratio using randomly permuted blocks within each center. The study will compare chronic changes in structural and functional outcomes in CRT-D patients randomized to AV delay set as fixed, set with SmartDelay or determined by echocardiography. Patients will be followed at enrollment, implant, post-implant, 3-months post-implant and 6-months post-implant.

Eligibility criteria: Inclusion Criteria:

* Patients who meet current indications for a BSC CRT-D device with the SmartDelay algorithm
* Patients who are willing and capable of undergoing a device implant and participating in all testing associated with the SMART-AV Study
* Patients who are on optimal and stable pharmacologic therapy
* Patients who are expected to be in sinus rhythm at the time of implant
* Patients who have a life expectancy of more than 360 days, per physician's discretion
* Patients who are geographically stable and willing to comply with the required follow-up schedule
* Patients who are 18 years of age or above, or of legal age to give informed consent specific to state and national law

Exclusion Criteria:

* Patients who are in complete heart block, or who otherwise are unable to tolerate pacing at VVI-40 RV for up to 14 days
* Patients undergoing an upgrade of a pacemaker or implantable cardioverter-defibrillator who are unable to tolerate pacing at VVI-40 RV for up to 14 days
* Patients who have previously received cardiac resynchronization therapy
* Patients who are expected to receive a heart transplant or have other cardiac surgeries or procedures planned during the course of the study
* Patients who currently have or who are likely to receive a tricuspid valve prosthesis
* Patients who have a neuromuscular, orthopedic, or other non-cardiac condition that prevents normal, unsupported walking
* Patients who are pregnant or planning to become pregnant during the study
* Patients who are currently enrolled in another investigational study or registry that would directly impact the treatment or outcome of the current study

Primary outcomes:
measure: Left Ventricular End-systolic Volume (LVESV)
timeFrame: 6 months
Secondary outcomes:
measure: Secondary Endpoints Will Include Structural and Functional Measures
timeFrame: Chronic
Other outcomes:
Locations:
city: Richmond
country: United States
facility: Medical College of Virginia
state: Virginia
Study officials:
affiliation: Boston Scientific Corporation
name: CRM Clinical Affairs
role: STUDY_DIRECTOR
References:
citation: Auricchio A, Stellbrink C, Block M, Sack S, Vogt J, Bakker P, Klein H, Kramer A, Ding J, Salo R, Tockman B, Pochet T, Spinelli J. Effect of pacing chamber and atrioventricular delay on acute systolic function of paced patients with congestive heart failure. The Pacing Therapies for Congestive Heart Failure Study Group. The Guidant Congestive Heart Failure Research Group. Circulation. 1999 Jun 15;99(23):2993-3001. doi: 10.1161/01.cir.99.23.2993.
citation: Auricchio A, Ding J, Spinelli JC, Kramer AP, Salo RW, Hoersch W, KenKnight BH, Klein HU. Cardiac resynchronization therapy restores optimal atrioventricular mechanical timing in heart failure patients with ventricular conduction delay. J Am Coll Cardiol. 2002 Apr 3;39(7):1163-9. doi: 10.1016/s0735-1097(02)01727-8.
citation: Inoue N, Ishikawa T, Sumita S, Nakagawa T, Kobayashi T, Matsushita K, Matsumoto K, Ohkusu Y, Taima M, Kosuge M, Uchino K, Kimura K, Umemura S. Long-term follow-up of atrioventricular delay optimization in patients with biventricular pacing. Circ J. 2005 Feb;69(2):201-4. doi: 10.1253/circj.69.201.
citation: Meisner JS, McQueen DM, Ishida Y, Vetter HO, Bortolotti U, Strom JA, Frater RW, Peskin CS, Yellin EL. Effects of timing of atrial systole on LV filling and mitral valve closure: computer and dog studies. Am J Physiol. 1985 Sep;249(3 Pt 2):H604-19. doi: 10.1152/ajpheart.1985.249.3.H604.
citation: Morales MA, Startari U, Panchetti L, Rossi A, Piacenti M. Atrioventricular delay optimization by doppler-derived left ventricular dP/dt improves 6-month outcome of resynchronized patients. Pacing Clin Electrophysiol. 2006 Jun;29(6):564-8. doi: 10.1111/j.1540-8159.2006.00402.x.
citation: Steendijk P, Tulner SA, Bax JJ, Oemrawsingh PV, Bleeker GB, van Erven L, Putter H, Verwey HF, van der Wall EE, Schalij MJ. Hemodynamic effects of long-term cardiac resynchronization therapy: analysis by pressure-volume loops. Circulation. 2006 Mar 14;113(10):1295-304. doi: 10.1161/CIRCULATIONAHA.105.540435. Epub 2006 Mar 6.
citation: Hardt SE, Yazdi SH, Bauer A, Filusch A, Korosoglou G, Hansen A, Bekeredjian R, Ehlermann P, Remppis A, Katus HA, Kuecherer HF. Immediate and chronic effects of AV-delay optimization in patients with cardiac resynchronization therapy. Int J Cardiol. 2007 Feb 14;115(3):318-25. doi: 10.1016/j.ijcard.2006.03.015. Epub 2006 Aug 7.
citation: Tournoux FB, Alabiad C, Fan D, Chen AA, Chaput M, Heist EK, Mela T, Mansour M, Reddy V, Ruskin JN, Picard MH, Singh JP. Echocardiographic measures of acute haemodynamic response after cardiac resynchronization therapy predict long-term clinical outcome. Eur Heart J. 2007 May;28(9):1143-8. doi: 10.1093/eurheartj/ehm050. Epub 2007 Apr 21.
citation: Vidal B, Sitges M, Marigliano A, Delgado V, Diaz-Infante E, Azqueta M, Tamborero D, Tolosana JM, Berruezo A, Perez-Villa F, Pare C, Mont L, Brugada J. Optimizing the programation of cardiac resynchronization therapy devices in patients with heart failure and left bundle branch block. Am J Cardiol. 2007 Sep 15;100(6):1002-6. doi: 10.1016/j.amjcard.2007.04.046. Epub 2007 Jul 5.
citation: Kedia N, Ng K, Apperson-Hansen C, Wang C, Tchou P, Wilkoff BL, Grimm RA. Usefulness of atrioventricular delay optimization using Doppler assessment of mitral inflow in patients undergoing cardiac resynchronization therapy. Am J Cardiol. 2006 Sep 15;98(6):780-5. doi: 10.1016/j.amjcard.2006.04.017. Epub 2006 Jul 28.
citation: Howell S, Stivland TM, Stein K, Ellenbogen K, Tereshchenko LG. Response to cardiac resynchronisation therapy in men and women: a secondary analysis of the SMART-AV randomised controlled trial. BMJ Open. 2021 Oct 27;11(10):e049017. doi: 10.1136/bmjopen-2021-049017.
citation: Howell SJ, Stivland T, Stein K, Ellenbogen KA, Tereshchenko LG. Using Machine-Learning for Prediction of the Response to Cardiac Resynchronization Therapy: The SMART-AV Study. JACC Clin Electrophysiol. 2021 Dec;7(12):1505-1515. doi: 10.1016/j.jacep.2021.06.009. Epub 2021 Aug 25.
citation: Spinale FG, Meyer TE, Stolen CM, Van Eyk JE, Gold MR, Mittal S, DeSantis SM, Wold N, Beshai JF, Stein KM, Ellenbogen KA; SMART-AV Trial Investigators. Development of a biomarker panel to predict cardiac resynchronization therapy response: Results from the SMART-AV trial. Heart Rhythm. 2019 May;16(5):743-753. doi: 10.1016/j.hrthm.2018.11.026. Epub 2018 Nov 24.