Author Information
Goel A*, Jain P**, Shende
D***, Chauhan AR****.
(* Third Year Resident, **
Second Year Resident, *** Assistant Professor, **** Additional Professor. Department
of Obstetrics and Gynecology, Seth GS Medical
College & KEM Hospital, Mumbai,
India.)
Abstract
Idiopathic
thrombocytopenic purpura (ITP) in pregnancy is uncommon. It usually presents in
first trimester of pregnancy but may present at any point of gestation. A case
of chronic ITP in pregnancy leading to neonatal thrombocytopenia is presented
here.
Introduction
Thrombocytopenia
complicates 10% of all pregnancies.[1] The most common cause of isolated
thrombocytopenia in first and second trimesters of pregnancy is ITP, which
accounts for 5% of all pregnancy associated thrombocytopenia. Incidence of ITP
is 1-2/1000 pregnancies.[2] Making a diagnosis is complex and challenging as
time of onset of thrombocytopenia and its clinical manifestations usually
overlap. ITP may lead to maternal and neonatal complications. Its management
requires collaboration between obstetrician and hematologist.
Case Report
A 35 year old female,
diagnosed case of chronic ITP, Gravida 2 Para 1 with previous neonatal death,
registered antenatally at 6 weeks of gestation with severe thrombocytopenia
(platelet count of 10000/μL). She was diagnosed as a case of chronic ITP 4
years ago, when she was started on corticosteroids, azathioprine and dapsone.
As she did not respond to medical treatment, she underwent splenectomy. She was
then started on penicillin prophylaxis (tablet penicillin G 400 mg twice daily)
and corticosteroids (tablet dexamethasone 40 mg for four days every month). She
conceived 2 years later, and received 18 platelet transfusions and intravenous
immunoglobulins during peripartum period. She delivered a male child of 2.5 kg
by outlet forceps application. However, the baby died on day 1 of life due to
unknown cause.
She was antenatally
registered with us in this pregnancy and had regular follow-up. She was
admitted at 34 weeks of gestation as she developed steroid induced diabetes
mellitus. On examination, her vital parameters were normal. On abdominal
examination the uterus was 34 weeks of gestation and relaxed, the presentation
was cephalic, fetal heart sounds were regular (140 bpm). Vaginal examination
was unremarkable.
Hematological
investigations showed normal hemoglobin of 11.7 g/dL, normal total and
differential white blood cell counts, but abnormality in the form of isolated
thrombocytopenia (platelet count of 10,000/μL) and anisocytosis, poikilocytosis, crenated red
blood cells on peripheral smear. Her fasting and postprandial blood sugars were
elevated FBS- 103 mg/dl, PLBS- 124 mg/dl, oral glucose tolerance test (100 g - Carpenter and Coustan) 99/121/102/93, Serum LDH was elevated (777 U/L). Renal, thyroid
and liver function tests were within normal limits.
She was treated with
tablet metformin and injection human insulin after endocrinologist’s opinion.
Blood sugar levels and blood pressure monitoring was done. The treatment plan
was to increase the platelet count prior to anticipated delivery. In view of
her persistently low platelet counts, she was started on injection methyl
prednisolone 500 mg IV for 3 days, which raised her platelet count to only
40000/μL. Injection dexamethasone 40 mg in 100 ml normal saline once daily for
4 days was given intravenously, which raised her platelet count to 86,000/μL. Intravenous immune globulin (IVIg) 1 g/kg body weight
was transfused and her platelet count rose to 1,20,000/μL; hence induction was
planned. However, she went into spontaneous labor a day prior to planned
induction and delivered a male child of 2.6 kg vaginally. On day 2 of delivery,
her platelet counts started to decline again (platelet count- 95,000 /μL).
In view of maternal
history and previous neonatal loss, serial platelet counts of the neonate were
done, and the baby developed neonatal thrombocytopenia (platelet count-
20,000/μL). The neonate was given 2 doses of injection methyl prednisolone
intravenously on day 2 of life. Neonatal thrombocytopenia resolved
spontaneously after a few days and both mother and child were discharged on day
7 after delivery.
Discussion
ITP may be subdivided
into primary and secondary types. Secondary ITP may be due to autoimmune
disorder, HCV, HIV, H. pylori infection. It is most commonly due to clearance
of platelet coated by IgG antiplatelet antibodies in spleen and less commonly
due to direct activation of complement system, diminished production, and
alteration in regulatory T cells.[3,4,5] ITP is likely to occur if there is a
history of thrombocytopenia in prior pregnancy, underlying autoimmune disease
or severe thrombocytopenia especially in first trimester of pregnancy.[6]
According to American
Society of Hematology (ASH) [7] and British Committee for Standards in
Hematology[8] guidelines, treatment is required for women with platelet count
<10,000/μL at any time during pregnancy or <30,000/μL in second or third
trimester or when thrombocytopenia is associated with bleeding.
Corticosteroids are the
first line of management during pregnancy. Prednisone and prednisolone are
preferred in pregnancy. Therapeutic dose of prednisolone is 1 mg/kg (based on
pre pregnancy weight) which needs to be titrated to lowest effective dose after
achieving a response. However steroids may cause gestational diabetes, weight
gain, hypertension, acceleration of bone loss, placental abruption and preterm
labor, orofacial clefts in the first trimester. Our patient developed
steroid-induced diabetes mellitus. High dose IVIg (2 mg/kg over 2-5 days) is
required to increase the platelet count rapidly. Multiple courses of IVIg are
required as the response is usually transient; as this is expensive its use
should be just prior to anticipated delivery. Combination of steroids and IVIg
is used for refractory cases. Laparoscopic splenectomy may be considered in
second trimester in cases who do not respond to steroids or IVIg. Anti-D
immunoglobulin is relatively contraindicated but may be given in third
trimester to refractory cases.[9] Cytotoxic drugs and immunosuppressive drugs
are avoided in pregnancy.
Mode of delivery should be
determined by obstetric indications. Cesarean section should be done for
obstetric indication only. According to ASH guidelines, platelet count should
be > 50,000/μL for vaginal delivery and cesarean section. But according to
BCSH guidelines, platelet count should be >50,000/μL for vaginal delivery
and > 80,000/μL for cesarean section and epidural anesthesia, which is
currently followed in our institute. Corticosteroids can be started 10 days
prior to anticipated delivery for a patient whose platelet count is
<80,000/μL and has not required therapy during pregnancy, as we did in our
case. When the delivery is imminent, IVIg should be considered. Platelet
transfusion is generally not useful in ITP. In emergency cases, platelet
transfusion along with IVIg can be considered.
5% of the offspring
develop fetal thrombocytopenia. Nadir in the infant platelet count occurs 2 to
5 days after delivery which spontaneously rises by day 7 of delivery. Most
reliable predictor of neonatal thrombocytopenia is history of thrombocytopenia
in prior sibling at delivery.[10] Risk of intracranial hemorrhage in neonate is
below 1%. [11]
Conclusion
ITP can complicate
pregnancy and its management. More aggressive treatment is required for
preparing the patient for labor and delivery. The outcome of pregnancy is
generally good. Other causes of thrombocytopenia need to be ruled out.
References
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Citation
Goel A, Jain P, Shende
D, Chauhan AR. Chronic Idiopathic
Thrombocytopenic Purpura Causing Neonatal Thrombocytopenia. JPGO 2015. Volume 2
No. 11. Available from: http://www.jpgo.org/2015/12/chronic-idiopathic-thrombocytopenic.html