Mixed-effects models for modeling cardiac functions and treatment effects.

Linear mixed-effects model;Nonlinear mixed-effects models;Cardiac function;Ischemia/reperfusion injury;Change point model;Heart rate

Hyejeong Jang

University:University of Louisville

Department:Bioinformatics and Biostatistics

关键词: Linear mixed-effects model;    Nonlinear mixed-effects models;    Cardiac function;    Ischemia/reperfusion injury;    Change point model;    Heart rate;   

Others  :  https://ir.library.louisville.edu/cgi/viewcontent.cgi?article=1678&context=etd

美国|英语

来源: The Universite of Louisville's Institutional Repository

【 摘 要 】

Mixed-effects model is an efficient tool for analyzing longitudinal data. The random effects in mixed-effects model can be used to capture the correlations among repeated measurements within a subject. The time points are not fixed and all available data can be used in mixed-effects model provided data are missing at random. For this reason, we focus on applying mixed-effects models to the repeated measurements of cardiac function including heart rate, left ventricle developed pressure, and coronary flow in the Glutathione-S-transferase P (GSTP) gene knockout and wild-type mice following ischemial/reperfusion injury performed in the isolated, Langendorff-perfused heart. Cardiac function is measured during three time periods: pre-ischemia, ischemia (no flow), and reperfusion. We developed piecewise nonlinear mixed-effects model to describe the different aspects of the cardiac function during each period. We applied nonlinear mixed-effects models and a changing point model to examine how cardiac function was altered by ischemial/reperfusion-induced injury and for comparison between mouse strains. These findings provide evidence of a new application for the mixed-effects model in physiological and pharmacological studies of the heart.