Kink in bypass graft 89 days post surgery

[glumdl]

Hello,
My husband (46 yrs old) underwent bypass (single) of the left main coronary artery 89 days ago.  He had no prior OR family history of heart problems.  He does NOT have high blood pressure, high cholestorol and is not overweight.  He was, however, a heavy smoker.  
Four weeks post surgery, he was like an 18 year old kid again.  His only meds were aspirin and simvistatin and he was told by 3 doctors to do whatever he wanted to do.  By six weeks he was mowing and gardening, riding motorcyles, four-wheeling, etc.  
From day one post-surgery, he had constant nagging pain in the wall of his chest.  We were told this was because the mammary artery was used for the graft.  On or about the 81st day post surgery, his heart pain (angina) returned VERY suddenly and severely.  We took him for a stress test and they decided not to perform it.  Instead he underwent an angiogram.  He was found to be UNbypassed in the left main due to a "kink" in the graft.
I asked the cardiologist over and over what that means and he seems reluctant to talk about it.  He just keeps saying: "it's a technical problem with the surgery" and literally refuses to discuss it any further.  I asked him if my husband did something wrong to cause it and he says that's not possible.  I asked if the surgeon messed up somehow and he repeated the sentence in quotes above.  I asked when it happened and he said it was probably like that from day one.
How do "kinks" in a bypass graft happen?

[kenkeith]

Malposition or KINKING of the graft can also result in early graft occlusion (blockage), particularly in longer grafts.

Some technical factors and not entirely conclusive that may predispose venous grafts to kinking: The angle of the attachment is critical; or malpositioned without adequate support for the graft, the vessel may kink as it emerges from the proximal opening.  This may make selecting the proper length of the vein more challenging, potentially resulting in either a stretched short segment of vein or kinking of an overly long segment of the graft.

Management of kinks in internal mammary artery bypass grafts is controversial. Treatments used for this condition have included repeat surgery or percutaneous (balloon) coronary intervention including stenting.  A stenosis in a MAMMARY ARTERY  graft secondary to a kink, however, may be best left untreated. These kinks are not related to graft vessel disease and are probably related to the tortuosities in the graft. Percutaneous treatment using intracoronary stents can in fact result in displacement of these kinks. Spontaneous resolution of such kinks in internal mammary artery grafts.

[glumdl]

Yes, he had open heart on the bypass 89 days ago.  It was 95% blocked left main coronary artery.  They told us they couldn't stent that at that time as the left main is too important.
Now that the graft has kinked, they want to do stents.  It didn't "disappear" though?

[Encephalomalcia]

Sometimes the grafts themselves disappear when they do not heal in properly.  Usually, the next step would be to stent it.  Did he have open heart surgery for the one bypass?  Was it 100% blocked?  If he does get a stent, he should limit some of the activites and lifting.  A lot of people I know with stents are on limits of what they can lift, some are on limits of 5 pounds, some 10 pounds.