Re: Anti-M

From: robert berg (robert.berg@nyu.edu)
Thu Mar 27 20:15:03 2008


In

*European Journal of Obstetrics & Gynecology and Reproductive Biology*, *Volume 92, Issue 1*, *September 2000*, *Pages 75-81*

Moise mentions 6 (not 1, sorry) of severe disease reported in the English literature; the same article references the following:

Anti-M Isoimmunization: Management and Outcome at The Ohio State University >From 1969 to 1995
*

Anna de Young-Owens, Melanie Kennedy, Robin Lee Rose, Jeffrey Boyle and Richard O'Shaughnessy * Received 11 April 1997; revised 10 July 1997; accepted 31 July 1997. Available online 3 February 1998.

Abstract

*Objective: To review the management strategies and outcome in gravidas with anti-M isoimmunization over the past 26 years at The Ohio State University.*

*Methods: Data collected from 115 pregnancies found to have anti-M antibody at The Ohio State University from September 1969 through February 1996 were reviewed retrospectively. We analyzed indirect antiglobulin tests, amniotic fluid with spectrophotometric examination, direct antiglobulin tests, M antigen status, antepartum course, and perinatal outcome.*

*Results: Anti-M antibody was found in 90 women who had 115 pregnancies over 26 years. Among those with positive indirect antiglobulin tests, 104 pregnancies had titers at or below 1:4. Only one patient with an initial low titer experienced more than a three-fold increase to 1:64. Two women underwent a total of eight amniocenteses when titers were at or above 1:128. Forty-two (60%) of the 70 infants tested were positive for M antigen. Nine infants required phototherapy. Eight of these infants were delivered preterm. There was an increase in the number of women seen with anti-M antibody in pregnancy at our institution, with nearly 10% of all gravidas with a positive antibody screen having anti-M alloantibodies. There were no cases of hemolytic disease of the newborn, mild or severe.*

*Conclusion: The prevalence of anti-M isoimmunization may be increasing. The incidence of severe hemolytic disease of the newborn due to anti-M is extremely low. We found no cases in our review of 115 pregnancies, although there have been several cases of severe hemolytic disease of the newborn reported. If anti-M is detected in pregnancy, the titer is low (no more than 1:4), and there is no history of prior pregnancy complications suggesting a hemolytic disease process, we recommend no further testing other than an indirect antiglobulin test at 28 weeks to look for the emergence of other alloantibodies. However, if the initial titer is elevated or there is a concerning obstetric history, serial titers should be performed and amniocenteses reserved for rising titers.*

On Thu, Mar 27, 2008 at 9:11 PM, Glen Elrod <dr99645@yahoo.com> wrote:

> Thats odd. Williams has a big table and it says hemolytic disease is
> mild to severe in anti-M.
>
> Repeat antibody screen today was negative. I'll repeat it again at 16
> wks.
>
> Glen
>

>> ----- Original Message ----
> From: robert berg <robert.berg@nyu.edu>
> To: Multiple recipients of list OB-GYN-L <ob-gyn-l@mail.obgyn.net>
> Sent: Thursday, March 27, 2008 4:11:13 PM
> Subject: Re: Anti-M
>
> Interesting. I just had my first pt with anti-M; she's now 20 weeks.
> There is (I believe) only one case report of an affected baby of a mother
> with anti-M. In general anti-M is of no clinical significance; titers are
> probably not necessary. I am, however, doing them q month just out of
> curiosity (they have been 1:8 since her first visit at 8 weeks). If she
> inceased by 2 dilutions, I think I'd get MCA dopplers, mostly out of
> academic curiosity.
>
> The same week I got a new pt with anti Fya. From what I learned in
> residency "Kell kills, Lewis lives, Duffy dies." Apparently however, this
> is wrong, too, and Duffy isn't a big deal either. I'm doing the same with
> her; she's still too low to titrate.
>
> On 3/27/08, Glen Elrod <dr99645@yahoo.com> wrote:
> >
> > 35 yo G7P3033 at 9 wks with O+ blood type, no history of transfusion or
> > trauma, has an anti-M antibody on new ob labs.
> >
> > Titer is now pending.
> >
> > Any suggestions of what to do next? Timing of next titer? If less than
> > 1/32 would you do nothing?
> >
> > Thanks,
> >
> > Glen
> >
>
> --
> __________________________________
> Robert E. Berg, MD, FACOG, FACS
> __________________________________
> And this affects me, how?
>
> now.<http://us.rd.yahoo.com/evtQ733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ>
>

--
__________________________________
Robert E. Berg, MD, FACOG, FACS
__________________________________
And this affects me, how?




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