Case report
Suspicion of pulmonary embolism during treatment of pemphigoid gestationis

Case report

A 32-year-old primigravida in the 36th week of gestation was admitted to the Dermatology Department with highly pruritic, polymorphous eruption of 3 weeks’ duration. The medical history revealed labial infection with herpes simplex virus 4 weeks earlier.

Physical examination revealed erythematous urticarial papules and plaques forming concentric rings of target-like appearance (erythema iris). The primary lesions were localized on the abdomen in the periumbilical area and extremities, especially on the hands and feet. Solitary vesiculobullous lesions and erosions were localized on distal parts of the extremities. There was no involvement of facial and mucous membranes.

The patient was treated with oral acyclovir at a dose of 400 mg three times a day, dexamethasone 6 mg i.v. once daily, oral antihistaminic (clemastine 1 mg twice a day), and a topical high potency steroid. After the 6th day of treatment, the patient was transferred to the Gynecology and Obstetrics Department, where she gave birth to a healthy female weighing 2590 g, 51 cm long, and 10 points in the Apgar Scale. The delivery occurred in the 37th week of gestation and consisted of an uncomplicated, spontaneous vaginal delivery. The patient was treated with cefuroxime during the stay in the delivery room to avoid infection due to amniotic fluid leakage.

Postpartum, our patient developed generalized erythematous and papular skin lesions on the trunk, extremities, and face with exfoliation on the palmar surface of the hands and feet. There were bullous lesions and erosions localized on the extremities, abdomen, and trunk (Figures 1-4) prompting re-admission to the Dermatology Department. A biopsy was taken from the lesion on the patient’s arm. Hematoxylin and eosin stain (H + E) revealed infiltrations of eosinophils in the dermal-epidermal junction and edema of the dermis. Direct immunofluorescence (DIF) of skin biopsy revealed positive linear deposits of complement C3c along the basement membrane zone (BMZ) (Figure 5). Indirect immunofluorescence (IIF) studies were conducted with monkey and guinea pig esophagus as substrate antibodies and IgG against a BMZ (1 : 80) of the epidermis were detected in the serum. These results confirmed the diagnosis of pemphigoid gestationis.

The patient was treated with intravenous dexamethasone at a dose of 8 mg a day, oral antihistamine, cetirizine 30 mg per day, and a topical medium potency steroid. On the third day of the treatment, the patient presented with chest pain, shortness of breath, and swelling of the right lower leg. To exclude a pulmonary embolism, the patient had computed tomography (CT) pulmonary angiogram, which revealed no abnormalities; there were no signs of deep venous thrombosis in duplex and color Doppler ultrasound. Dyspnea and edema resolved after

2 days of treatment with furosemidum (40 mg a day) and low-molecular heparin (enoxaparinum 60 mg daily). The patient was discharged from the hospital in good condition and advised to continue treatment with cetirizine

(20 mg per day) and a topical steroid. During a follow-up visit 3 days later, the patient revealed exacerbation of

skin lesions with new bullae on the hands, forearms,

and with generalized itching. The patient was treated for

2 months with methylprednisolone (in a decreasing dose from 32 mg to 4 mg per day), a topical medium potency steroid, and cetirizine at a dose of 20 mg per day. The patient showed good response to the treatment and did not present new skin lesions 3 months later.

Discussion

Pemphigoid gestationis (synonyms: herpes gestationis, dermatitis multiformis gestationis) is a subepidermal blistering disease of pregnancy [1]. Pemphigoid gestationis has been estimated to occur in 1 : 50 000 pregnancies and usually presents in the second or third trimester with exacerbation after partum [2-4]. This was the case for our patient. Initial symptoms appeared in the third trimester with deterioration after partum. The mother is affected more often than both the mother and the infant. In most cases, the disease is caused by circulating IgG1 immunoglobulin against hemidesmosomal protein bullous pemphigoid BP180 (BPAG2) type XVII collagen or BP230

[2, 5]. The binding of IgG to the basement membrane leads to the formation of subepidermal bullae and vesicles. Pemphigoid gestationis shows a genetic linkage to HLA-DR3 (80% of the patients) and HLA-DR4 (53%); 43-50% express both MHC II genes [2, 3]. Subepidermal blister, dermal edema, and perivascular infiltrate of eosinophils, lymphocytes and histiocytes are observed in histopathological examination. Skin lesions in PG are polymorphous. The disease usually starts with pruritic papules or urticarial wheals on the abdomen (periumbilical distribution) and limbs. Some of lesions may produce target-like appearance and bulla, but not vesicles [4]. In our case, the initial location of the lesions, which were found on the abdomen, corresponded with the typical course of the disease. Symptoms may also be reminiscent of erythema multiforme, especially because of previous herpetic infection.

The diagnosis of pemphigoid is based on the DIF finding of C3 with IgG (in 25% of cases) along the basement membrane zone in the skin. Pemphigoid gestationis is a self-limiting disease and can heal spontaneously after delivery [3, 6-9]. The aim of the treatment is to prevent new blister formation and relieve pruritus. Topical steroids and antihistaminic drugs constitute the first-line treatment; however, they are not sufficient in the majority of cases. Patients usually respond well to oral steroids (prednisolone 0.5 mg/kg/day). In the case of our patient, the treatment with oral antihistamine was not sufficient; therefore, we decided to start treatment with oral corticosteroids. Side effects must be kept in mind, especially an increased risk of thromboembolism during puerperium [10-12]. The risk of thromboembolism is also increased by the treatment with a systemic steroid. In more severe cases, when steroids are ineffective, the patient can be treated with immunoglobulin, immunosuppressants (methotrexate, cyclosporine), or plasmapheresis [2, 5].

Differential diagnosis of urticarial lesions includes erythema multiforme (especially if it is preceded by viral infection, e.g. herpes simplex), pruritic urticarial papules and plaques of pregnancy (PUPPP), or an exacerbation of other autoimmune bullous skin disorders.

Pemphigoid gestationis is a rare disease that requires proper diagnosis before the commencement of the treatment. Cooperation between the dermatologist, obstetrician, and neonatologist ensures that the patient will receive the best treatment with the lowest incidence of side effects.

References

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