Getting blood from a lady who has ever been pregnant could possibly be dangerous for males, a brand new examine from the Netherlands suggests.
The examine, revealed as we speak (Oct. 17) within the journal JAMA, discovered that males who obtained blood transfusions from beforehand pregnant feminine donors had been 13 p.c extra more likely to die through the examine interval, in contrast with males who obtained blood transfusions from male donors.
In distinction, males who obtained blood transfusions from ladies who had by no means been pregnant weren’t at elevated threat of loss of life over the examine interval, in contrast with males who obtained transfusions from different males, the examine discovered. And girls who obtained blood from ladies both with or and not using a historical past of being pregnant weren’t at elevated threat of loss of life, in contrast with ladies who obtained blood from male donors.
The findings “are provocative and should — if true — have vital medical implications,” in addition to have an effect on the blood donation course of and using blood in transfusions, Dr. Ritchard Cable, of the American Pink Cross Blood Providers, and Dr. Gustaf Edgren, of the Division of Hematology at Karolinska College Hospital in Stockholm, wrote in an editorial accompanying the examine. Nonetheless, the outcomes are preliminary, and it is doable that there are different explanations for the findings. Subsequently, extra research are wanted to verify the outcomes, Cable and Edgren mentioned. For now, the standards for donating blood shouldn’t change, they mentioned. [9 Uncommon Conditions That Pregnancy May Bring]
It isn’t precisely clear why blood from feminine donors who’ve been pregnant is linked with an elevated threat of loss of life amongst male recipients. Nonetheless, the researchers speculated that adjustments that happen in a lady’s immune system throughout being pregnant might play a task.
Earlier research instructed that males who obtain blood transfusions from ladies are at larger threat of loss of life than males who obtain transfusions from male donors. But it surely wasn’t clear if a historical past of being pregnant amongst feminine donors affected this hyperlink.
Within the new examine, researchers from Leiden College Medical Middle analyzed data from greater than 31,000 people who obtained pink blood cell transfusions within the Netherlands between 2005 and 2015. Individuals had been included within the examine provided that they obtained transfusions solely from considered one of three sorts of donors: male donors, feminine donors with a historical past of being pregnant, and feminine donors and not using a historical past of being pregnant. (This implies, for instance, that sufferers couldn’t be included within the examine in the event that they obtained blood transfusions from each a male donor and a feminine donor with a historical past of being pregnant.) The members had been adopted, on common, for a bit over a 12 months after their transfusions.
Total, practically four,000 members died through the examine interval. For male sufferers, there have been 101 deaths per 1,000 individuals per 12 months amongst those that obtained blood from feminine donors with a historical past of being pregnant, in contrast with simply 80 deaths per 1,000 individuals per 12 months amongst those that obtained blood from male donors. This elevated price of loss of life was seen just for males ages 50 and youthful.
Among the many males who obtained blood from ladies and not using a historical past of being pregnant, there have been 78 deaths per 1,000 individuals per 12 months — about the identical as the speed of loss of life amongst males who obtained transfusions from male donors.
For girls, there was not a rise within the price of loss of life amongst those that obtained blood from ever-pregnant or never-pregnant ladies, in contrast with those that obtained blood from male donors. [Men vs. Women: Our Key Physical Differences Explained]
Docs have identified that, in uncommon instances, individuals who obtain a blood transfusion develop a situation known as transfusion-related acute lung damage (TRALI), a critical inflammatory response within the lungs that can lead to loss of life. Antibodies or different immune system components that ladies develop in being pregnant might set off TRALI in male blood-transfusion recipients, the researchers hypothesized.
However the examine had limitations. For instance, as a result of the sufferers within the examine obtained blood transfusions from just one kind of donor, these sufferers tended to obtain fewer transfusions than the common transfusion affected person. (The possibilities affected person obtained transfusions from multiple kind of donor will increase with the variety of transfusions.) So it is unclear how nicely the findings apply to the overall inhabitants of transfusion sufferers (who could also be sicker than these within the examine), the researchers mentioned.
As well as, the discovering of an elevated threat of loss of life amongst males who obtained transfusions from ever-pregnant ladies was true just for males ages 50 and youthful. “This makes the findings very tentative, they usually require validation in different research,” the researchers wrote.
But when future research do present an analogous hyperlink, “blood facilities and transfusion companies might want to mitigate this threat,” Cable and Edgren mentioned of their editorial. This may be carried out by matching donors and recipients primarily based on intercourse, or by modifying donor blood in such a method as to additional take away immune system components that may be accountable for the hyperlink, they mentioned.
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