Atomfizikas un spektroskopijas institūts / Institute of Atomic Physics and Spectroscopy

Permanent URI for this community

https://dspace-dev.lu.lv/handle/7/118
LU zinātniskais institūts / Scientific Institute of the University of Latvia

Browse

Browsing Atomfizikas un spektroskopijas institūts / Institute of Atomic Physics and Spectroscopy by Subject "Erythema Index"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Photoplethysmography for bovine heat detection: the preliminary results
    (International Society for Optics and Photonics (SPIE), 2020-02-14) Cugmas, Blaž; Plavšić, Aleksandar; Štruc, Eva; Spīgulis, Jānis
    In this study, we applied photoplethysmography (PPG) as an alternative, convenient, and affordable method for bovine heat detection. Heat detection is an essential part of effective herd reproduction management. Currently, there are many different heat detection techniques, but they can be ineffective or impractical to use. Since heat affects local vulvar blood circulation (resulting in swelling and erythema), photoplethysmography could represent an affordable alternative to detect this bovine phenomenon. In this study, we enrolled 20 animals in heat and other stages of the bovine reproduction cycle. We analyzed the PPG signal in terms of baseline (DC component), power, kurtosis, and erythema index. One vaginal measurement site, approximately 8 cm from the vulva, exhibited significant differences in mucous color (PPG green and red baseline, both erythema indices). What is more, cows in heat displayed higher PPG signal power and kurtosis, but differences were not significant. Photoplethysmography exhibited the potential to detect bovine heat.
  • Thumbnail Image
    Item
    Skimager for the objective erythema estimation in atopic dogs
    (International Society for Optics and Photonics (SPIE), 2020-02-19) Cugmas, Blaž; Olivry, Thierry; Olivrī, Alla; Spīgulis, Jānis
    In this study, the severity of canine skin erythema was assessed objectively for the first time. Atopic dermatitis (AD) is a common canine inflammatory and pruritic skin disease associated with an allergic reaction to exogenous allergens. The monitoring of skin erythema over time with lesion severity scales like the CADESI-4 is an essential diagnostic and research tool, especially for clinical trials. Currently, the erythema assessment is subjective due to visual estimation. In our study, we calculated the erythema index (EI) in 14 atopic dogs based on the analysis of multispectral skin images taken with the Skimager device. The relationship between the EI and a visual erythema estimation was modeled by linear regression with the first-order polynomial. The coefficient of determination (r squared) reached 0.81. Based on such high correlation, we conclude that optical measurements could replace the visual estimation of erythema in atopic dogs and, thus, improve the validity of skin lesion severity scales in dogs.