© Springer India 2016
Alpesh Gandhi, Narendra Malhotra, Jaideep Malhotra, Nidhi Gupta and Neharika Malhotra Bora (eds.)Principles of Critical Care in Obstetrics10.1007/978-81-322-2686-4_1919. Systemic Lupus Erythematosus and Pregnancy
(1)
Department of Obstetrics & Gynaecology, Calcutta National Medical College & Hospital, CD-55, Sector-1, Salt Lake City, Kolkata, 700 064, India
(2)
Department of Obstetrics & Gynaecology, N.R.S. Medical College, Kolkata, West Bengal, India
Overview
Systemic lupus erythematosus (SLE) is a multisystem connective tissue disease characterized by multi-organ involvement; characteristic inflammatory lesions of the skin, joints, serous membranes, kidneys and CNS; and its association with high titres of autoantibodies to an array of autoantigens. Its clinical course is often one of the disease flares followed by variable periods of remission. Approximately 90 % of the affected population are young women in their second or third decades of life. Therefore, SLE is the commonest connective tissue disorder encountered during pregnancy, and it has been widely studied by researchers across the globe. Evidence shows the foetal and maternal outcomes are adversely affected by the disease.
A multidisciplinary team comprising of obstetrician with experience in high-risk care, rheumatologist, nephrologists and haematologist is essential for monitoring and managing women with SLE during pregnancy and puerperium [1].
Epidemiology
The prevalence of the disease shows wide variation in relation to geographical and racial background.
A point prevalence of 3/100,000 population was observed by researchers in India [2]. This was much lower than data available from the western countries (12.5/100,000 in England [2a], 39/100,000 in Finland [2b], 124/100,000 in the USA [2c]).
Evidence suggests that SLE is more common in African American and Hispanic groups than in Caucasians. The incidence of lupus is much higher in women than in men. During the childbearing years, the female-to-male ratio is about 12:1.
Pathophysiology
Effect of Pregnancy on SLE
There is no consensus of opinion whether pregnancy results in exacerbations or “flare-ups” of SLE. Earlier studies conducted before 1980 showed very high (up to 6 times higher) incidences of flare during pregnancy especially during puerperium in comparison to non-pregnant controls [3, 4]. A number of recent case control studies however found a modest rise of such flares (15–60 %) during pregnancy [5, 6]. Some investigators believe that the rate of flares during pregnancy may be similar to the frequency of exacerbation while not pregnant, while other researchers maintain that pregnancy is a time of vulnerability to increased disease activity [7, 8].
Risk of SLE flares was found to be proportional to disease activity at the onset of pregnancy. Women who had sustained remission prior to pregnancy had lesser chance of having flares. In contrast women who discontinued maintenance therapy before pregnancy suffered more exacerbations during pregnancy.
Renal disease flare-up is the most common presentation of SLE aggravation in pregnancy. Combining all published data on women with lupus nephropathy, it was evident that one third of them had exacerbations, 21 % of them had deterioration of renal function during pregnancy, and 7 % had permanent deterioration of the same [9]. Chorea is a rare complication of SLE which was found to aggravate during pregnancy.
Effect of SLE on Pregnancy
Pregnancy and its outcome are affected by SLE in the following manner.
Gestational Hypertension and Pre-eclampsia
Twenty to 30% of women with SLE develop gestational hypertension or pre-eclampsia during pregnancy [10]. Women with lupus nephropathy develop this complication more frequently. SLE associated with chronic hypertension, antiphospholipid syndrome and long-term steroid use are also vulnerable to develop pre-eclampsia.
Secondary Antiphospholipid Syndrome and Thrombosis
Women with SLE who have antiphospholipid antibodies (anticardiolipin antibody and lupus anticoagulant) carry additional risk of thrombosis during pregnancy and especially during puerperium.
Pregnancy Loss
Women with SLE have higher rates of miscarriages and intrauterine foetal death than the general healthy obstetric population. In a meta-analysis of various prospective studies on foetal outcome of women with SLE, it was found that 8–23 % (median 14 %) had miscarriages, 2–12 % (median 5 %) had foetal deaths, and 15–34 % (median 24 %) had overall pregnancy losses. Women with nephropathy and antiphospholipid syndrome were found to have higher rates of pregnancy loss [9].
The cause of miscarriages and foetal death is uncertain. Inflammation and altered compliment regulation, poor placentation and placental infarction are some of the possible causes.
Preterm Birth
Although the preterm birth rate in women with SLE and in healthy controls were compared in a few studies, available evidence shows a higher incidence of preterm birth in women with SLE, more so in women with active disease [11]. It may be attributed to higher incidence of pre-eclampsia and foetal growth restriction needing premature termination.
Foetal Growth Restriction
Co-morbidities as hypertension and renal disease and also steroid therapy lead to high incidence of foetal growth restriction in women with SLE.
Neonatal Lupus Syndrome
Neonatal lupus is the occurrence of SLE symptoms in an infant born from a mother with SLE, most commonly presenting with a rash resembling discoid lupus erythematosus, and sometimes with systemic abnormalities such as heart block or hepatosplenomegaly or haematological complications as haemolytic anaemia, leucopenia and thrombocytopenia. Cause of neonatal lupus may be due to transplacental passage of antibodies from mother. Neonatal lupus is highly associated with maternal anti-Ro/SSA (usually also with anti-La/SSB) antibodies, although the rash may occur with anti-ribonucleoprotein (RNP) antibodies.
Diagnosis
Revised American Rheumatism Association (1997) [12] criteria have been widely used for diagnosis of SLE. According to it, the women should have at least four of the following features, either simultaneously or serially.
1.
Facial butterfly rash
2.
Discoid lupus
3.
Photosensitivity rash as a result of sunlight exposure
4.
Oral or nasopharyngeal ulceration
5.
Nonerosive arthritis involving two or more peripheral joints
6.
Pleurisy or pericarditis
7.
Proteinuria >0.5 g/day or cellular cast
8.
Psychosis or convulsion
9.
One haematologic problem
10.
Hemolytic anaemia
11.
Leucopenia, WBC <4000/μL on two or more occasions
12.
Lymphopenia <1500/μL on two or more occasions
13.
Thrombocytopenia <100,000/μL (in absence of drug)
14.
Immunologic problem