Measurement of pruritus in a Chinese woman with pemphigoid gestationis using a wrist movement detector

Authors

  • Kam-lun Ellis Hon FAAP,

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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  • Lai-shan Mona Chiu MRCP,

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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  • Man-chin Adrian Lam BSc, MPhil,

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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  • Cheung-lung Paul Choi FRCPA,

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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  • Shirley Chan MRCP,

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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  • Nai-ming Luk MRCP

    1. From the Dermatology Research Centre, and Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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Kam-lun Ellis Hon, faap Department of Paediatrics The Chinese University of Hong Kong6/F, Clinical Sciences BuildingPrince of Wales Hospital Shatin Hong Kong
E-mail: ehon@cuhk.edu.hk

Abstract

Pemphigoid gestationis (PG) is a rare itching bullous disease of pregnancy and the postpartum period. We describe the use of a new methodology for measuring the nature and intensity of itching in a 21-year-old woman with pemphigoid gestationis. At 19 weeks gestation, she developed an itchy rash over the limbs, which spread to the trunk. Blisters then appeared on the hands which subsequently also involved the feet. Intense nocturnal wrist activities in this patient, measured with a wrist monitor and defined as average acceleration in the early hours of sleep, were even higher than that in patients with severe eczema, with an average value of 181.00 ± 43.49 (mean ± standard error) g/min for the first three hours, versus 84.47 ± 8.53 g/min for the group of 24 eczema subjects. Most wrist activities were slower movements at 0 to 1 Hz. This is in striking contrast to the scratching activities at 0 to 3 Hz in eczema subjects. There have been no therapeutic trials for PG. Topical steroid and oral antihistamines are usually ineffective, but worked in our patient. We also discuss the potential application of the monitor in assessing the nature of various dermatological or systemic itching disorders.

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