نتایج جستجو برای: hemoglobin oxygen saturation

تعداد نتایج: 295909  

2004
D J Saltzman

Background: Serial blood draws for the assessment of a trauma patient’s hemoglobin (sHgb) and hematocrit (sHct) is standard practice. In the event of multiple casualties this process can be time consuming and lead to the inefficient use of valuable resources. A device that would allow for continuous real-time, non-invasive monitoring of hemoglobin and tissue perfusion would not only improve the...

Journal: :Journal of biomedical optics 2009
Bertan Hallacoglu Richard S Matulewicz Harriet J Paltiel Horacio Padua Patricio Gargollo Glenn Cannon Ahmad Alomari Angelo Sassaroli Sergio Fantini

We present a quantitative near-IR spectroscopy study of the absolute values of oxygen saturation of hemoglobin before and after surgically induced testicular torsion in adult rabbits. Unilateral testicular torsions (0, 540, or 720 deg) on experimental testes and contralateral sham surgery on control testes are performed in four adult rabbits. A specially designed optical probe for measurements ...

Journal: :Investigative ophthalmology & visual science 2004
Bahram Khoobehi James M Beach Hiroyuki Kawano

PURPOSE To evaluate a hyperspectral imaging technique for monitoring relative spatial changes in retinal oxygen saturation. METHODS The optic nerve head (ONH) and overlying vessels in cynomolgus monkey eyes were imaged with a fundus camera attached to a hyperspectral imaging system. Images were acquired with inspiration of room air and pure oxygen and at controlled intraocular pressures (IOP)...

2017
Jang Ik Cho Buddha Basnyat Choongwon Jeong Anna Di Rienzo Geoff Childs Sienna R. Craig Jiayang Sun Cynthia M. Beall

Background and objectives: Tibetans have distinctively low hemoglobin concentrations at high altitudes compared with visitors and Andean highlanders. This study hypothesized that natural selection favors an unelevated hemoglobin concentration among Tibetans. It considered nonheritable sociocultural factors affecting reproductive success and tested the hypotheses that a higher percent of oxygen ...

2012
Li Jin Pu Ying Shen Lin Lu Rui Yan Zhang Qi Zhang Wei Feng Shen

BACKGROUND Non-enzymatic glycation increases hemoglobin-oxygen affinity and reduces oxygen delivery to tissues by altering the structure and function of hemoglobin. OBJECTIVES We investigated whether an elevated blood concentration of glycosylated hemoglobin (HbA1c) could induce falsely high pulse oximeter oxygen saturation (SpO2) in type 2 diabetic patients during mechanical ventilation or o...

2006
Lippincott Williams

measured spectrophotometrically. (To avoid further confusion, I will use only O2sat and SO2 for the remainder of this article.) CO-oximetry, a more complex and reliable method, measures the concentration of hemoglobin derivatives in the blood, the results of which are then used to calculate various parameters such as hemoglobin derivative fractions (e.g., FO2Hb), total hemoglobin, and oxygen sa...

Journal: :Optics letters 2011
Amos Danielli Christopher P Favazza Konstantin Maslov Lihong V Wang

Recently, we developed a reflection-mode relaxation photoacoustic microscope, based on saturation intensity, to measure picosecond relaxation times using a nanosecond laser. Here, using the different relaxation times of oxygenated and deoxygenated hemoglobin molecules, both possessing extremely low fluorescence quantum yields, the oxygen saturation was quantified in vivo with single-wavelength ...

Journal: :American journal of physiology. Heart and circulatory physiology 2005
Ivo P Torres Filho James Terner Roland N Pittman Leonardo G Somera Kevin R Ward

A system is described for in vivo noninvasive measurements of hemoglobin oxygen saturation (HbO2Sat) at the microscopic level. The spectroscopic basis for the application is resonant Raman enhancement of Hb in the violet/ultraviolet region, allowing simultaneous identification of oxy- and deoxyhemoglobin with the same excitation wavelength. The heme vibrational bands are well known, but the tec...

Journal: :The journal of extra-corporeal technology 1990
G Z Bolen G E Anderson J R Huddleson J B Riley R G Sutton D G Bishop

Three devices used to measure hemoglobin oxygen saturation in the extracorporeal circuit were studied and compared to a control. The Baxter Bentley OxySat, Oximetrix Accusat, and Radiometer ABL4 blood gas monitor were compared to a control, the IL 282 Co-Oximeter. Fifty-one sample points were obtained during all phases of cardiopulmonary bypass with results as follows: table: see text. The Ac...

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