Optical Coherence Tomography of the Saphenous Vein Graft

Coronary Bypass Graft Stenosis Clinical Trial

— OCTOCAB  

Official title:

Intraoperative Optical Coherence Tomography of the Saphenous Vein Conduit in Patients Undergoing Coronary Artery Bypass Surgery

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT05129228
• Other study ID #: 21-10
• Status: Recruiting
• Phase: N/A
• Start date: April 4, 2022
• Est. completion date: April 4, 2026

Study information

• Verified date: May 2022
• Source: St. Francis Hospital, New York
• Contact: Ziad A. Ali, MD,DPhil
• Phone: 516-622-4552
• Email: ziadali.mail[@]gmail.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

OCTOCAB is a prospective, randomized (1:1), single-center trial. The purpose of this study is to determine whether intravascular optical coherence tomography (OCT) guided saphenous vein grafting in coronary artery bypass surgery will reduce the rate of early vein graft failure (VGF).

Description:

Within the first year of coronary artery bypass grafting (CABG) surgery, the saphenous vein grafts have a failure rate of 10 to 25%. Visual inspection of the vein graft conduit is the current standard in determining the quality of the vein segment. However, there may be intraluminal abnormalities that are undetectable via a visual inspection. OCT examination, using the ILUMIEN OPTIS NEXT OCT Imaging system, of endoscopically harvested saphenous vein conduits will indicate such pathology and enable the surgeon to assess the quality of the harvested vein at the intravascular level.

This study is designed to demonstrate the superiority of OCT-guided saphenous vein CABG in improving the rates of early VGF and the overall outcome of CABG.

The study will follow two randomization arms: OCT-guided saphenous vein CABG (interventional arm) vs. visual inspection-guided saphenous vein CABG (standard of care arm). The analysis of subjects will be with respect to their analyzed group.

Following enrollment, participants will be followed for up to 10 years. The primary endpoint is per graft incidence of vein graft failure. The assessment of the vein graft will be conducted via coronary CT angiogram (CCTA) at 12 months. In the case where the participant has unplanned angiogram due to clinical reasons, prior to the 12 months, the condition of the graft will be determined via the angiogram. Unless all target grafts have reached the endpoint prior to the 12 month time point, a CCTA will be required.

To achieve the power level of 85% at the significance level of 0.025, 760 patients is the anticipated sample size. Analysis will be conducted at the graft level with a Linear Mixed model to account for any potential patient effects.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 760
• Est. completion date: April 4, 2026
• Est. primary completion date: April 4, 2024
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Subject must be at least 18 years of age.

2. Subject must have evidence of myocardial ischemia (e.g., stable angina, silent ischemia (ischemia in the absence of chest pain or other anginal equivalents), unstable angina, or acute myocardial infarction) suitable for elective CABG.

3. Subject must have undergone coronary angiography identifying at least one lesion that is clinically appropriate and suitable for saphenous vein bypass grafting.

4. Subject must provide written Informed Consent prior to any study related procedure.

Exclusion Criteria:

1. STEMI =24 hours from the onset of ischemic symptoms

2. Creatinine clearance =30 ml/min/1.73 m2 (as calculated by MDRD formula for estimated GFR) and not on dialysis.

3. Hypotension, shock or need for mechanical support or intravenous vasopressors at the time that the patient would be undergoing the index procedure.

4. CHF (Killip class >2 or NYHA class >3)

5. LVEF <30% by the most recent imaging test within 6 months prior to procedure. If no LVEF test result within 6 months is available, it must be assessed by echocardiography, multiple gated acquisition (MUGA), magnetic resonance imaging (MRI), ventriculography (LV gram) or other method.

6. Unstable ventricular arrhythmias

7. Concomitant multi-valve surgery or major aortic root surgery.

8. Planned non-cardiac surgery within 24 months after the index procedure

9. Prior CABG

10. Any planned PCI within any target vessel(s) within 24 months.

11. Subject has known hypersensitivity or contraindication to any of the study drugs (including aspirin, all P2Y12 inhibitors).

12. Subject has received a heart transplant.

13. Subject is receiving immunosuppressant therapy or has known immunosuppressive or severe autoimmune disease that requires chronic immunosuppressive therapy (e.g., human immunodeficiency virus, systemic lupus erythematosus, etc.).

14. Subject has previously received or is scheduled to receive radiotherapy to a coronary artery (vascular brachytherapy), or the chest/mediastinum.

15. Subject has a platelet count <100,000 cells/mm3 or >700,000 cells/mm3.

16. Subject has a documented or suspected hepatic disorder as defined as cirrhosis or Child-Pugh = Class B.

17. Subject has a history of bleeding diathesis or coagulopathy.

18. Subject has life expectancy <2 years for any non-cardiac cause.

19. Pregnant or nursing subjects and those who plan pregnancy in the period up to 2 years following index procedure. Female subjects of child-bearing potential must have a negative pregnancy test done within 7 days prior to the index procedure per site standard test.

20. Presence of other anatomic or comorbid conditions, or other medical, social, or psychological conditions that, in the investigator's opinion, could limit the subject's ability to participate in the clinical investigation or to comply with follow-up requirements, or impact the scientific soundness of the clinical investigation results.

Conduit exclusion criteria

1. Severe conduit tortuosity of venous conduit (e.g., with varicosities) such that it is unlikely that the OCT catheter can be delivered without vascular damage.

Related Conditions & MeSH terms

• Coronary Bypass Graft Stenosis

Intervention

Device:
• OCT-guided saphenous vein CABG
OCT examination of harvested saphenous vein conduits will indicate pathology. Under the surgeon's discretion the conduit segments with pathology will not be grafted.

Locations

Country	Name	City	State
United States	St Francis Hospital	Roslyn	New York

Sponsors (1)

Lead Sponsor	Collaborator
St. Francis Hospital, New York

Country where clinical trial is conducted

United States, 

References & Publications (10)

Antonopoulos AS, Odutayo A, Oikonomou EK, Trivella M, Petrou M, Collins GS, Antoniades C; SAFINOUS-CABG (Saphenous Vein Graft Failure-An Outcomes Study in Coronary Artery Bypass Grafting) group. Development of a risk score for early saphenous vein graft failure: An individual patient data meta-analysis. J Thorac Cardiovasc Surg. 2020 Jul;160(1):116-127.e4. doi: 10.1016/j.jtcvs.2019.07.086. Epub 2019 Aug 26. — View Citation

Caliskan E, de Souza DR, Böning A, Liakopoulos OJ, Choi YH, Pepper J, Gibson CM, Perrault LP, Wolf RK, Kim KB, Emmert MY. Saphenous vein grafts in contemporary coronary artery bypass graft surgery. Nat Rev Cardiol. 2020 Mar;17(3):155-169. doi: 10.1038/s41569-019-0249-3. Epub 2019 Aug 27. Review. — View Citation

Fitzgibbon GM, Kafka HP, Leach AJ, Keon WJ, Hooper GD, Burton JR. Coronary bypass graft fate and patient outcome: angiographic follow-up of 5,065 grafts related to survival and reoperation in 1,388 patients during 25 years. J Am Coll Cardiol. 1996 Sep;28(3):616-26. — View Citation

Gaudino M, Di Franco A, Bhatt DL, Alexander JH, Abbate A, Azzalini L, Sandner S, Sharma G, Rao SV, Crea F, Fremes SE, Bangalore S. The association between coronary graft patency and clinical status in patients with coronary artery disease. Eur Heart J. 2021 Apr 7;42(14):1433-1441. doi: 10.1093/eurheartj/ehab096. — View Citation

Goldman S, Copeland J, Moritz T, Henderson W, Zadina K, Ovitt T, Doherty J, Read R, Chesler E, Sako Y, et al. Saphenous vein graft patency 1 year after coronary artery bypass surgery and effects of antiplatelet therapy. Results of a Veterans Administration Cooperative Study. Circulation. 1989 Nov;80(5):1190-7. — View Citation

Hattler B, Messenger JC, Shroyer AL, Collins JF, Haugen SJ, Garcia JA, Baltz JH, Cleveland JC Jr, Novitzky D, Grover FL; Veterans Affairs Randomized On/Off Bypass (ROOBY) Study Group. Off-Pump coronary artery bypass surgery is associated with worse arterial and saphenous vein graft patency and less effective revascularization: Results from the Veterans Affairs Randomized On/Off Bypass (ROOBY) trial. Circulation. 2012 Jun 12;125(23):2827-35. doi: 10.1161/CIRCULATIONAHA.111.069260. Epub 2012 May 16. — View Citation

Mehta RH, Ferguson TB, Lopes RD, Hafley GE, Mack MJ, Kouchoukos NT, Gibson CM, Harrington RA, Califf RM, Peterson ED, Alexander JH; Project of Ex-vivo Vein Graft Engineering via Transfection (PREVENT) IV Investigators. Saphenous vein grafts with multiple versus single distal targets in patients undergoing coronary artery bypass surgery: one-year graft failure and five-year outcomes from the Project of Ex-Vivo Vein Graft Engineering via Transfection (PREVENT) IV trial. Circulation. 2011 Jul 19;124(3):280-8. doi: 10.1161/CIRCULATIONAHA.110.991299. Epub 2011 Jun 27. — View Citation

Raza S, Blackstone EH, Houghtaling PL, Rajeswaran J, Riaz H, Bakaeen FG, Lincoff AM, Sabik JF 3rd. Influence of Diabetes on Long-Term Coronary Artery Bypass Graft Patency. J Am Coll Cardiol. 2017 Aug 1;70(5):515-524. doi: 10.1016/j.jacc.2017.05.061. — View Citation

Sabik JF 3rd, Lytle BW, Blackstone EH, Houghtaling PL, Cosgrove DM. Comparison of saphenous vein and internal thoracic artery graft patency by coronary system. Ann Thorac Surg. 2005 Feb;79(2):544-51; discussion 544-51. — View Citation

Tan ES, van der Meer J, Jan de Kam P, Dunselman PH, Mulder BJ, Ascoop CA, Pfisterer M, Lie KI. Worse clinical outcome but similar graft patency in women versus men one year after coronary artery bypass graft surgery owing to an excess of exposed risk factors in women. CABADAS. Research Group of the Interuniversity Cardiology Institute of The Netherlands. Coronary Artery Bypass graft occlusion by Aspirin, Dipyridamole and Acenocoumarol/phenoprocoumon Study. J Am Coll Cardiol. 1999 Nov 15;34(6):1760-8. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Intimal injury	Major - Disruption of intima with arc = 60° AND length: = 2 mm Minor - Disruption of intima with arc <60° AND length: <2 mm	12 months
Other	Intraluminal mass	Major - Mass extending = 5 cm and = 2 mm in diameter Minor - Mass extending < 5 cm and < 2 mm in diameter	12 months
Other	Intramural hematoma	Major - = 60° arc and length = 5mm Minor - < 60° arc and length < 5mm	12 months
Other	Valvular sclerosis	Major - > 0.25mm thickness Minor - = 0.25mm thickness with redundant valve tissue	12 months
Other	Immunohistochemistry	Relationship between the OCT-identified abnormalities with immunohistochemistry in the surplus and OCT-guided excluded segments of vein grafts for histological validation of OCT-identified abnormal findings.	12 months
Other	Transit-Time Flow Meter (TTFM)	All grafts will be assessed with TTFM to assess anastomosis. Data will be reviewed to determine whether TTFM abnormalities correlated to OCT findings.	12 months
Other	Relationship between OCT parameters and endpoint rates		12 months
Other	Relationship between OCT parameters at baseline in the standard of care arm with OCT findings in vivo during follow-up		12 months
Primary	Vein graft failure (VGF)	Per graft incidence of VGF defined as greater than or equal to 70% in the body of the graft on coronary CT angiography (CCTA)	12 months
Secondary	Target graft failure (TGF)	Composite time-to-first event rate of cardiac death, target graft myocardial infarction (TG-MI), or ischemia-driven target graft revascularization (ID-TGR)	12 months
Secondary	Per graft incidence of ischemic vein graft failure	Greater than or equal to 70% stenosis	12 months
Secondary	Per graft incidence anatomic vein graft failure	Greater than or equal to 50% stenosis	12 months
Secondary	Per patient incidence of vein graft patency	Vein graft having less than 50% stenosis	12 months
Secondary	Per patient incidence of ischemic vein graft failure	Greater than or equal to 70% stenosis	12 months
Secondary	Per patient incidence of anatomic vein graft failure	Greater than or equal to 50% stenosis	12 months
Secondary	Mean vein graft diameter stenosis		12 months
Secondary	Mean vein graft area stenosis		12 months
Secondary	All-cause mortality		12 months
Secondary	Cardiac and non-cardiac mortality		12 months
Secondary	All Myocardial Infarction (MI)		12 months
Secondary	Target graft myocardial infarction (TG-MI) and Non-Target graft myocardial infarction (non-TG-MI)		12 months
Secondary	All revascularization		12 months
Secondary	Ischemia driven (ID)-revascularization and Non-ischemia driven (ID)-revascularization		12 months
Secondary	Ischemia driven-target graft failure (ID-TGR)		12 months
Secondary	Ischemia driven (ID)-revascularization of target native coronary artery subtended by the graft		12 months