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Acute mesenteric ischemia - origin of the clot

I had posted a couple of weeks ago about my sister in law, this is a follow up post with some questions and maybe a helpful post for anyone interested or going through similar health issues.
Patient history - 40 year old female in relatively good health. No history of high BP, diabetes or high cholesterol. She had been complaining of a dry cough plus trouble in breathing. She was diagnosed with asthma in December 2017 and was on medication for about 20 days. They seemed to have helped. She had no biological children,she had two miscarriages and an induced abortion due to fetal abnormalities between the ages of 25-28. She was good health (minus some cough) when she complained of a severe pain around her stomach area on 23/01/18. She was admitted to smaller local hospital the same day after she had two episodes of vomiting and the pain became unbearable. After a few tests and an ultrasound scan the doctor there diagnosed her with pancreatitis despite no size change in pancreas visible in the scan. The only basis for this seems to have been an elevated lipase level (239.4 U/L whereas the normal range is 13-60), her Hb was also low at 6.8gm%. Her ultrasound report said all her organs, aorta and IVC were as expected. The doctor noted post menopausal changes in uterus which surprised us as she had regular periods and had never told anyone about experiencing any menopause like symptoms.
She was put on antacids, antibiotics, pain meds and IV. On 27/01/18 she was pain free in stable condition and a liquid diet was started. She soon complained of unbearable pain again, this time the pain was stronger than before. A decision was made to shift her to a larger hospital. On the evening of 27/01/18 in the new hospital, a CT scan was performed that showed thrombi. Her spleen was completely infarcted, kidneys had small infarcts, gall bladder was hyperdense and sludge noticed. Stomach, liver and pancreas were normal, her small intestine was partially necrotic. She had multiple thrombi; thrombus in aorta at origin of celiac artery, hepatic artery and splenic artery. Segmental thrombi in superior mesenteric artery.
She was put on heparin and broad spectrum antibiotics. Her WBC count was at 36000 so an inflammation was suspected. No tenderness was observed visually and when on pain meds she was able to talk normally.
On 28/01/18 a femural vein catheter was inserted for thrombolysis of the SMA clot. On the morning of 29/01/18 it was reported that the clot had reduced by 15%. By 3PM on 29/01, she developed a clot at the origin on catheter at the femural vein. Parallely a surgery was decided upon to remove the necrotic part of the small intestine. At 5PM she was wheeled in for an angioplasty (most likely) to remove the clot at the femural vein. The procedure was to last 45 minutes, however after 2 hours we were told that despite their best efforts, the clot in the femural vein had reformed faster than they could remove it. We were also told that the thrombolysis medication being pumped to dissolve the SMA thrombus was having no effect on her. After this no other CT scan or similar was performed on her due to her unstable condition. All information on size of thrombus after this was based the doctors' best guess. The surgeon refused to perform the surgery discussed because he said the mortality rate would be about 70-90%
On the morning of 30/01 we were told the prognosis was bleak. A hematologist was called in. She started her on full body heparin and steroids to combat the infection causing elevated WBC. By this point the doctors told us that they were not trying to diagnose her but only manage the SMA thrombus due to the delicate condition she was in. We were now looking at an inevitable multi organ failure. The night of 30/01 doctors suspected her SMA was also completely blocked as her BP fellow to 40. She was also in acidosis. Dialysis was suggested to combat this but due to her being on blood thinners, doctors were worried she could bleed out while she was being prepared for dialysis (my understanding is they feared any incision might cause her to bleed out). On the morning of 31/01 dialysis was started after all options were weighed. We were told she had a couple of days to live. But she breathed her last around 1PM on 31/01.
The team handling her suspected thrombophilia due to her miscarriage history. However her antiphospholipid and ANA tests came back strong negative suggesting this wasnt a genetic disorder.
No one in our family has any medical background. So we poured through the reports and spoke to a surgeon about our doubts. He told us the condition she had was most likely acute mesenteric ischemia. This is caused due to a clot in mesenteric artery. Reading about it all her symptoms seem to fit. The only thing I don't understand is what caused the first clot. She was a healthy 40 year old woman, never smoked, drank or ate meat. She was moderately active and walked 40-60 minutes 5 days a week. She was not overweight and had no other previous complaints that could point us to any such condition.
We have narrowed down the cause of the clot of these few:
1. Oral contraceptives (no one including her husband remembers her taking these but we haven't totally ruled it out)
2. Congenital anomaly in anatomy of veins/arteries causing them to be more prone to clots
3. Arteriosclerosis
4. Embolism where the thrombus unfortunately settled in SMA causing the chain reaction.
Do the above conditions seem plausible. How does a 40 year old active woman have arteriosclerosis with no such history on either side of the family? Or if it is embolism, is it possible for the thrombus to travel from some vein and settle in SMA?
Any leads or information is greatly appreciated as we are looking for answers to obtain some closure. Thank you!
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