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Feasibility study of incident dark-field video microscope for measuring microcirculatory variables in the mouse dorsal skinfold chamber model

Acute and Critical Care 2021년 36권 1호 p.29 ~ 36
Kang Christine, 조아름, 이현정, 김혜진, 김은정, 전소은, 홍정민, 문대환,
소속 상세정보
 ( Kang Christine ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
조아름 ( Cho Ah-Reum ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
이현정 ( Lee Hyeon-Jeong ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
김혜진 ( Kim Hyae-Jin ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
김은정 ( Kim Eun-Jung ) - Pusan National University School of Dentistry Department of Dental Anesthesia and Pain Medicine
전소은 ( Jeon So-Eun ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
홍정민 ( Hong Jeong-Min ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine
문대환 ( Moon Dae-Hoan ) - Pusan National University School of Medicine Department of Anesthesia and Pain Medicine

Abstract


Background: Despite the importance of microcirculation in organ function, monitoring microcirculation is not a routine practice. With developments in microscopic technology, incident dark field (IDF) microscopy (Cytocam) has allowed visualization of the microcirculation. Dorsal skinfold chamber (DSC) mouse model has been used to investigate microcirculation physiology. By employing Cytocam-IDF imaging with DSC model to assess microcirculatory alteration in lipopolysaccharide (LPS)-induced endotoxemia, we attempted to validate availability of Cytocam-IDF imaging of microcirculation.

Methods: DSC was implanted in eight BALB/c mice for each group; control and sepsis. Both groups were given 72 hours to recover from surgery. The sepsis group had an additional 24-hour period of recovery post-LPS injection (4 mg/kg). Subsequently, a video of the microcirculation was recorded using Cytocam. Data on microcirculatory variables were obtained. Electron microscopy was implemented using lanthanum fixation to detect endothelial glycocalyx degradation.

Results: The microcirculatory flow index was significantly lower (control, 2.8±0.3; sepsis, 2.1±0.8; P=0.033) and heterogeneity index was considerably higher (control, 0.10±0.15; sepsis, 0.53±0.48; P=0.044) in the sepsis group than in the control group. Electron microscopy revealed glycocalyx demolishment in the sepsis group.

Conclusions: Cytocam showed reliable ability for observing changes in the microcirculation under septic conditions in the DSC model. The convenience and good imaging quality and the automatic analysis software available for Cytocam-IDF imaging, along with the ability to perform real-time in vivo experiments in the DSC model, are expected to be helpful in future microcirculation investigations.

키워드

dorsal skinfold chamber model; glycocalyx; incident dark field; microcirculation; sepsis

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