An interventional study of No-touch SVG harvest vs conventional SVG harvest technique and Fish oil supplementation vs placebo in Coronary Artery Disease, sponsored by Sunnybrook Health Sciences Centre. Completed at 1 site in Canada. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2017-10-05.
Sponsored by Sunnybrook Health Sciences Centre · Not applicable, Interventional, and Treatment
Surgery for blocked arteries in the heart (coronary artery bypass grafting) can be accomplished using veins from the leg sewn onto the heart to provide an alternate path for blood flow, i.e. 'bypassing' the blockages. These veins themselves can block over time. This may result in part simply from the trauma from the surgery, in other words, by removing the vein from the leg and then sewing it to the heart. Another mechanism may be the abnormal metabolic processes within the body responsible for the plaque build-up of the heart arteries in the first place - this may lead to the blockages of the veins used for bypass. In the present era of heart bypass surgery, this incidence of veins blocking remains high despite advances in blood thinners and cholesterol medications. This study is designed to determine whether two new interventions may potentially reduce the incidence of blockages in the veins used for heart bypass surgery. One is a surgical technique significantly reducing the trauma associated with removing the leg vein prior to use as a bypass graft onto the heart. The second intervention is the use of a nutritional supplement before and after surgery which is composed of fish oils. The study will recruit sufficient patients to provide strong and relevant conclusions regarding both study questions. It will be highly applicable also because it will include approximately 1,550 patients from approximately 50 hospitals across many countries. We believe these techniques will result in significantly less vein blockages in patients one year after heart bypass surgery.
Background: Saphenous vein grafts (SVG) remain the most widely used conduit for CABG. However, contemporary patency rates at one-year post CABG remain poor, despite optimal medical therapy. Recent trials (PREVENT IV) demonstrate that up to 45% of all patients have one or more SVG occluded at angiography one year post-CABG; up to 25% of all SVG are occluded at one year post-CABG angiography. Furthermore, patients with at least one SVG occluded had twice the incidence of perioperative MI, and thirteen times the composite endpoint of death, late MI or repeat revascularization at 12-18 months.
The proposed SUPERIOR SVG Trial is a prospective, international, multi-centre randomized controlled clinical trial (RCT). It utilizes a factorial design to elucidate the benefits of two interventions, one surgical and the other pharmacological, to improve saphenous vein graft patency after coronary artery bypass grafting surgery (CABG):
Surgical Arm: Does a novel atraumatic ("no touch") technique of pedicled saphenous vein graft (SVG) harvesting result in improved angiographic patency and clinical outcomes at 1 year, compared to conventional SVG harvesting techniques, in patients undergoing CABG.
Rationale: A Swedish cardiac surgical centre has published numerous studies demonstrating that harvesting the SVG with a cushion of surrounding fat and without vein graft distension, "no touch" technique, improved surrogate markers of vein preservation in operative specimens. Graft patency was superior in a single small RCT (8.5 year patency: "no touch" 90% vs. conventional 76%, p=0.01, adjusted OR 3.7, 95% CI 1.4-9.6, p=0.007).
Pharmacological Arm: Does N-3 polyunsaturated fatty acid (fish oil) oral supplementation result in improved angiographic patency and clinical outcomes at 1 year, compared to placebo, in patients undergoing CABG.
Rationale: In vivo studies showed levels of N-3 polyunsaturated fatty acids (PUFA; fish-oils) inversely correlate with the risk of coronary disease. Several large RCTs (more than 40,000 patients in aggregate) performed in diverse cardiovascular populations, have demonstrated moderate mortality benefits. A single RCT from the 90's found that that SVG patency was enhanced with fish oils.
Methods: Each patient will be randomized to a SVG harvested in the conventional fashion (open or endoscopic) or using the "no touch" technique (single-blinded). The pharmacological arm of the factorial design will have patients also randomized to fish-oil or placebo (double-blinded) starting prior to surgery and continuing for 1 year. The primary outcomes (Surgical Arm: proportion of study SVG grafts occluded; Pharmacological Arm: proportion of patients with ≥1 graft occluded) at 1 year CT angiography (window 9-15 months) will be compared between the treatment and control groups. Secondary endpoints include incidence of 50-99% study SVG stenosis at 1 year, adverse events and perioperative and 1 year clinical events (mortality, non-fatal MI, repeat revascularization).
A sample size of 615 patients/arm will provide adequate statistical power (Surgical Arm, Primary Outcome: study SVG graft occlusion, control event rate = 20%, no-touch event rate = 14%, RRR = 0.30, β = 0.2; Pharmacological Arm, Primary Outcome: patients with at least 1 graft occlusion, control event rate = 30%, fish oils event rate 22.5%, RRR = 0.25, β= 0.15). The total sample size has been increased 25% to 1550 patients as approximately 20% of recruited patients in angiographic trials fail to undergo follow-up angiography. Study patients will be enrolled over 39 months at 50 centers. Pilot funding has been secured from CIHR-CANNeCTIN to assess feasibility in 50 patients from 15 sites. A single interim analysis will be performed following completion of 50% of the CT angiograms, p\<0.001.
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Procedure: No-touch SVG harvest vs conventional SVG harvest technique · Dietary Supplement: Fish oil supplementation vs placebo
Procedure: No-touch SVG harvest vs conventional SVG harvest technique · Dietary Supplement: Fish oil supplementation vs placebo
Procedure: No-touch SVG harvest vs conventional SVG harvest technique · Dietary Supplement: Fish oil supplementation vs placebo
Procedure: No-touch SVG harvest vs conventional SVG harvest technique · Dietary Supplement: Fish oil supplementation vs placebo
Saphenous vein harvested using the pedicled (no-touch) technique or using the conventional technique. Fish oil supplements/placebo (1g taken orally twice daily for 1 year post-op)
Fish oil supplementation \[1g tablets (55% fish oils - EPA:DHA 33%:22%)\] taken twice daily for 1 year post-op
Also known as: Ocean Nutrition Omega Pure fish oil capsules
Surgical Arm: Proportion of study SVGs which are totally occluded on cardiac CT angiography at 1-year post-CABG and death due to CV or unknown causes.
Time frame: 1 year post-operative
Pharmacological Arm: Proportion of patients with ≥1 graft (saphenous or arterial) totally (100%) occluded on cardiac CT angiography at 1-year post-CABG and death due to CV or unknown causes, comparing the fish-oil to placebo groups.
Time frame: 1-year post-operative
Surgical Arm: i. To determine whether the "no touch" technique of SVG harvesting results in a lower proportion of study SVGs that have a significant stenosis (50-99%) on 1-year post-CABG angiography compared to conventional SVG harvesting techniques.
Time frame: 1 year post-operavtive
Surgical Arm: ii. To determine whether the incidence and severity of adverse SVG harvesting events at 1-yr post-CABG (infection, haematoma, swelling, neuropathy, quality of life measures) are similar between the "no touch" and conventional groups.
Time frame: 1-year post-operative
Surgical Arm: iii. The incidence of the composite of non-fatal MI (new definition), all-cause mortality, and repeat revascularization (redo CABG or PCI) perioperatively ( major adverse cardiac events ,MACE ) and stroke at 1 yr is lowe
Time frame: 1-year post-operative
Pharmacological Arm: i. To determine whether fish oil supplementation results in a lower proportion of patients with ≥1 graft with a significant (50-99%) stenosis at 1-year post-CABG angiography, compared to those who received placebo.
Time frame: 1-year post-operative
Pharmacological Arm: ii. The incidence of the composite of n-fatal MI (new definition), all-cause mortality, and repeat revascularization (redo CABG or PCI) perioperatively ( major adverse cardiac events ,MACE ) and stroke at 1 yr i
Time frame: 1-year post-operative
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