title: Monitoring hypoxia induced changes in cochlear blood flow and hemoglobin concentration using a combined dual-wavelength laser speckle contrast imaging and Doppler optical microangiography system.
abstract: A synchronized dual-wavelength laser speckle contrast imaging (DWLSCI) system and a Doppler optical microangiography (DOMAG) system was developed to determine several ischemic parameters in the cochlea due to a systemic hypoxic challenge. DWLSCI can obtain two-dimensional data, and was used to determine the relative changes in cochlear blood flow, and change in the concentrations of oxyhemoglobin (HbO), deoxyhemoglobin (Hb) and total hemoglobin (HbT) in mice. DOMAG can obtain three-dimensional data, and was used to determine the changes in cochlear blood flow with single vessel resolution. It was demonstrated that during a hypoxic challenge there was an increase in the concentrations of Hb, a decrease in the concentrations of HbO and cochlear blood flow, and a slight decrease in the concentration of HbT. Also, the rate of change in the concentrations of Hb and HbO was quantified during and after the hypoxic challenge. The ability to simultaneously measure these ischemic parameters with high spatio-temporal resolution will allow the detailed quantitative analysis of several hearing disorders, and will be useful for diagnosing and developing treatments.
authors.affiliation: Department of Bioengineering, University of Washington, Seattle, Washington, United States of America.
authors.forename: Roberto
authors.initials: R
authors.lastname: Reif
authors.forename: Jia
authors.initials: J
authors.lastname: Qin
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.forename: Suzan
authors.initials: S
authors.lastname: Dziennis
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Zhi
authors.forename: Alfred L
authors.initials: AL
authors.lastname: Nuttall
authors.forename: Ruikang K
authors.initials: RK
authors.lastname: Wang
mesh_terms: D000792:Angiography; D000818:Animals; D003051:Cochlea / Q000098:blood supply* / Q000378:metabolism*; D006454:Hemoglobins / Q000737:chemistry / Q000378:metabolism*; D000860:Hypoxia; D017078:Laser-Doppler Flowmetry; D051379:Mice; D055096:Optical Devices; D012039:Regional Blood Flow
chemical_list: D006454:Hemoglobins