Pruritus in Pregnancy

Pruritus in pregnancy is a common and burdensome symptom that may be a first sign of a pregnancy-specific pruritic disease (atopic eruption of pregnancy, polymorphic eruption of pregnancy, pemphigoid gestationis, and intrahepatic cholestasis in pregnancy) or a dermatosis coinciding with pregnancy by chance. Despite its high prevalence, pruritus is often underrated by physicians, and data regarding the safety profiles of drugs for pruritus are very limited. In this review, we illustrate the epidemiology, possible pathophysiology, clinical characteristics, and diagnostic workup of various pregnancy-related diseases and discuss antipruritic treatments. The prevalence of pruritus in pregnancy demonstrates the importance of symptom recognition and the need for an holistic approach, taking into account both the potential benefits for the patient and the potential risks to the fetus.

Pemphigoid gestationis: a retrospective study in southwest Iran

Pemphigoid gestationis (PG) is a rare autoimmune bullous dermatosis of pregnancy usually presents in the second or third trimester. It is characterized by pruritic, urticarial plaques with the development of tense vesicles and bullae within the lesions. Pathogenesis of PG is not fully established, however, most patients develop circulating autoantibodies targeting the bullous pemphigoid (BP) 180 antigen. The aim of this work is to draw a profile of the epidemiology, clinical aspects, treatment and evolution of the disease by studying hospital series. We retrospectively investigated the 13 patients who were diagnosed with PG based on hospital data at the Referral Center of Southwest Iran located in Ahvaz city between March 2002 and March 2011. The age of onset was 21 to 40 years (mean age: 27.5 years). The onset of the disease occurred in the second trimester of pregnancy in 6 patients and in the third trimester of pregnancy in 4 patients. One patient had a flare up of disease during the first trimester and two out of cases in puerperium period. In all cases, pruritus was the first symptom, followed by an erythematous vesiculobullous eruption.  The diagnosis of PG was confirmed by skin biopsy. Ten out of the patients treated with oral corticosteroids (0.5-1 mg/kg/day), one of the patients underwent oral corticosteroids plus topical glucocorticoid and the last patient treated with topical glucocorticoid. PG remains a rare dermatosis of pregnancy. Our series had two particularities compared to other studies: high frequency in primigravida and the frequent involvement of the face. Additionally our study demonstrated that improvement could occur faster and provide acceptable management if the treatment of the patients would be implemented sooner.

[Pemphigoid gestationis: a review]

BACKGROUND

Pemphigoid gestationis (PG) is a rare auto-immune bullous disease occurring in one pregnant woman over 20,000 to 50,000.

OBJECTIVE

Review of literature about physiopathology, immunological diagnosis and treatment of PG.

METHODS

Research on Medline and Embase database without any time limit until April 2010. Because of the lack of randomized therapeutic trials in PG, retrospective series and case reports have been analyzed.

RESULTS

PG is due to auto-antibodies directed against BP180 secondary to a mother-fetus immunological tolerance breaking. Blister formation results from a complex mechanism involving TH2 lymphocytes, cytokines and polymorphonuclear cells. Clinically, the disease is characterized by a pruritic, more or less extensive erythemato-papulous eruption. The presence of vesicles and/or blisters is inconstant but evocative. Recovery occurs generally in a few weeks after delivery but relapses are frequent in subsequent pregnancies. Combined oral contraception may also trigger flares of the disease. Diagnosis is confirmed by direct immunofluorescence showing linear C3±IgG deposits in the dermal-epidermal junction. ELISA BP180-NC16A method is very sensitive to detect circulating auto-antibodies. Fetal prognosis is good, but early onset in 1(st) or 2(nd) trimester and blister formation are risk factors for prematurity and low birth weight. Rarely the newborn may be affected by very transitory blisters. Efficiency of very potent topical corticosteroids has been showed in several studies, and they may be used as first-intent treatment in moderate forms of PG. Systemic corticosteroids are indicated in extensive forms. In very exceptional chronic or relapsing PG, immunosuppressant agents may be necessary.

CONCLUSION

In the absence of consensus between moderate and severe forms of the disease, precise modalities of the steroid treatment (topical or systemic, duration and rhythm of decrease) are not well defined.

[Pemphigoid gestationis]

Pemphigoid gestationis (PG) is a rare autoimmune bullous dermatosis associated with pregnancy. Its previous designation, herpes gestationis, is obsolete. PG is characterized by a subepidermic separation induced by the presence of peripheral blood autoantibodies against two hemidesmosomal antigens: BPAG1 and BPAG2. Clinical diagnosis is confirmed by histology and positive cutaneous immunofluorescence tests. The most discriminant examination for other pruritic dermatoses of pregnancy is the enzyme-linked immunosorbent assay (Elisa) NC16A BP 180. First-line treatment is local corticosteroid therapy; if local treatment fails, general corticosteroid therapy should be administered. The prognosis is good for mother and child, except that there is a risk of preterm delivery and of moderate fetal growth restriction. Management in a specialized setting is therefore necessary. Recurrence is possible during subsequent pregnancies.

Pregnant women have increased incidence of IgE autoantibodies reactive with the skin and placental antigen BP180 (type XVII collagen)

BP180 (type XVII collagen) is a transmembrane protein expressed in a variety of cell types. It is also the target of autoantibodies in cutaneous autoimmune disease including bullous pemphigoid and pemphigoid gestationis, a disease unique to pregnancy. The purpose of this study was to determine the prevalence and specificity of cutaneous autoantibodies in a cohort of pregnant women. De-identified sera were collected from pregnant women (n=299) and from non-pregnant controls (n=134). Sera were analyzed by ELISA for the presence of IgG and IgE autoantibodies directed against several cutaneous autoantigens. IgE antibodies against the NC16A domain of BP180 were detected in 7.7% of pregnant women, compared to 2.2% of healthy controls (p=0.01). No increase in total or cutaneous autoantigen specific IgG was seen. Total serum IgE was within the normal range. Full-length BP180 was detected by western immunoblot in epidermal, keratinocyte, placental and cytotrophoblast (CTB) cell lysates. Furthermore, flow cytometry and indirect immunofluorescence confirmed the expression of BP180 on the surface of cultured CTBs. Finally, it was demonstrated that IgE antibodies in the pregnancy sera labeled not only cultured CTBs, but also the placental amnion and cutaneous basement membrane zone using indirect immunofluorescence. We conclude that some pregnant women develop antibodies specific for BP180, and that these autoantibodies are capable of binding both CTB and the placental amnion, potentially affecting placental function.

[Pemphgoid gestationis. A report of 30 cases]

Pemphigoid gestationis is an acute autoimmune subepidermal bullous dermatosis which occurs during pregnancy and post partum. It is a rare disease which incidence vary from 1/1700 to 1/60000 pregnancy. It occurs in young woman aged between 20 to 40 years. The authors try throughout a retrospective study of 30 cases of pemphigoid gestationis to drave the epidemiological and clinical profile and the immunopathological characteristics of this affection.

[Incidence of herpes neonatorum in Netherlands]

OBJECTIVE

Investigation of the incidence of neonatal herpes in the Netherlands between 1992 and 1998.

DESIGN

Inventory questionnaire survey.

METHODS

All virological laboratories in the Netherlands were sent a questionnaire on the number of culture proven cases of neonatal herpes recorded between 1992 and 1998 and on the type of herpes simplex virus (HSV-1 or HSV-2). The gynaecological and paediatric departments of all university hospitals and of half of the general hospitals were sent questionnaires as well. Gynaecologists were asked how often caesarean section was performed in order to prevent neonatal herpes and how frequently pregnant women were seen with genital herpes. Paediatricians were asked how often they observed neonatal herpes, the type of HSV and the possible transmission route. Based on these data the figures for the whole of the Netherlands were estimated.

RESULTS

The incidence of neonatal herpes in the Netherlands in the period 1992 to 1998 was 2.4 per 100,000 neonates. HSV-1 was the cause of neonatal herpes in 73%, HSV-2 in 9%, and in 18% of the cases the type of infection was not recorded. The number of pregnant women with genital herpes had increased, but, in agreement with a consensus statement, the gynaecologists hardly performed caesarean sections any more to prevent neonatal herpes (2 per year).

CONCLUSIONS

The incidence of neonatal herpes in the Netherlands had not increased. There was no predominant role of HSV type 2 causing neonatal herpes.

Specific pruritic diseases of pregnancy. A prospective study of 3192 pregnant women

BACKGROUND AND DESIGN

For a period of 1 year, all pregnant women presenting with itching were investigated by clinical, histologic, immunopathologic, and laboratory studies. Fifty-one of 3192 pregnant women were studied.

RESULTS

We identified (1) two typical cases of herpes gestationis, with an approximate incidence of one in 1700 pregnancies; (2) 22 cases of pruritus gravidarum, including five cases with a polymorphous skin eruption, with an incidence of one in 145 pregnancies; (3) 25 cases of polymorphic eruption of pregnancy, including diseases without maternal or fetal side effects and without criteria defining herpes gestationis or pruritus gravidarum, with an incidence of one in 130 pregnancies; and (4) two cases of intercurrent disease (one scabies and one exfoliative dermatitis).

CONCLUSION

Our study is a prospective homogeneous account of pruritic dermatosis of pregnancy. Our results show that the incidence of herpes gestationis is higher than is usually reported in the literature and that pruritus gravidarum must be considered in the presence of itching occurring during pregnancy, with or without skin eruption.

Herpes gestationis

Herpes gestationis is a rare autoimmune disease of pregnancy characterized by itching and skin lesions. The disease causes prominently maternal discomfort, but fetal and neonatal complications have been reported; however the frequency and severity of fetal illness are still debated. We describe three cases of herpes gestationis diagnosed and managed at our institution in the last 3 years.

Herpes gestationis

Only 14 years have elapsed since immunofluorescence techniques revised our concept of herpes gestationis. As our inquiry broadens, the answers seem farther away. Yet much knowledge has been gained regarding predisposition and the pathomechanism of this elusive disease. I offer a review of historical context and an update on our current confusions regarding this rare autoimmune dermatosis of pregnancy.

Herpes gestationis in blacks

To our knowledge, only two cases of herpes gestationis (HG) have been previously reported in black patients. We describe herein two black women with confirmed HG. Both had typical historical and clinical features of the disease. Direct immunofluorescence microscopy demonstrated complement deposition along the dermoepidermal junction in both women. Where HLA typing was possible (in one patient), the combination of HLA-DR3 and HLA-DR4 was found. In addition, anti-HLA-DR2 antibodies were present in serum samples taken from this patient. The occurrence of the HLA-DR3-DR4 combination has been reported to be greatly increased in whites with HG (43%, as compared with a 3% incidence in control subjects). The HLA-DR4 antigen is uncommon in American blacks, which may explain the infrequent occurrence of HG in this population. The occurrence of the DR2 antigen is increased in the husbands of women with HG, and this increase is most pronounced in the husbands of patients with the DR3-DR4 combination. The occurrence of positive immunofluorescence microscopy findings, together with the presence of a rare histocompatibility antigen combination previously associated with HG and the presence of anti-DR2 antibodies in the serum of one of our patients all suggest that HG is pathogenically identical in both blacks and whites.