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Blood flows and metabolic components of the cardiome
J B Bassingthwaighte1, Z Li, H Qian
1Department of Bioengineering, University of Washington, Seattle 98195, USA.
Insights
This project outlines the first stage of the Cardiome Project, aiming to create a quantitative computer model of normal heart function and its response to interventions. The model integrates coronary flow, metabolism, and electrophysiology for comprehensive cardiac simulation.
Area of Science:
- Computational Biology
- Cardiovascular Physiology
- Biophysics
Background:
- The Cardiome Project aims to create a quantitative, testable representation of normal heart function and its response to interventions.
- Previous research has covered diverse areas including blood flow, cellular transport, cardiac electrophysiology, substrate metabolism, and contraction regulation.
Purpose of the Study:
- To integrate years of research into a comprehensive and understandable scheme for cardiac function.
- To define coronary flow and metabolic components for a 3D computer model of the heart.
Main Methods:
- Developing a computer model integrating coronary flow distributions, substrate metabolism, ATP/PCr energy metabolism, and calcium metabolism.
- Incorporating physiological responses to regional ischemia, rate changes, and altered pacing sites.
Main Results:
- The model is designed to simulate appropriate responses to regional ischemia, including contractility loss and dilation.
- It will also model physiological responses to heart rate changes and metabolic demand variations.
- The model will predict changes in metabolic needs based on pacing site and mechanical activation.
Conclusions:
- This foundational stage of the Cardiome Project establishes a framework for a sophisticated cardiac computer model.
- The model aims to enhance understanding of normal heart function and its pathological responses, paving the way for further research and intervention strategies.
Abstract:
This is a plan for the first stage of The Cardiome Project. The cardiome is the representation, in quantitative, testable form, of the functioning of the normal heart and its responses to intervention. The goal is to integrate the efforts of many years into a comprehensive understandable scheme. Past efforts have spanned the fields of transport within blood vessels, the distributions of regional coronary blood flows, permeation processes through capillary and cell walls, mediated cell membrane transport, extra- and intracellular diffusion, cardiac electrophysiology, the uptake and metabolism of the prime substrates (fatty acid and glucose), the metabolism of the purine nucleosides and nucleotides (mainly adenosine and ATP), the regulation of the ionic currents and of excitation-contraction coupling and finally the regulation of contraction. The central theme is to define the coronary flows and metabolic components of a computer model that will become a part of a three-dimensional heart with appropriate fibre shortening and volume ejection. The components are: (a) coronary flow distributions with appropriate heterogeneity, (b) metabolism of the substrates for energy production, (c) ATP, PCr and energy metabolism and (d) calcium metabolism as it relates to excitation-contraction coupling. The modeling should provide: (1) appropriate responses to regional ischemia induced by constriction of a coronary artery, including tissue contractility loss and aneurysmal dilation of the ischemic region; (2) physiological responses to rate changes such as treppe and changes in metabolic demand and (3) changes in local metabolic needs secondary to changes in the site of pacing stimulation and shortening inactivation or stretch activation of contraction.