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With Cold Blood

Posted by ubpdqn on March 27, 2011

There are a number of ways to detect and measure flow in biological and non-biological systems. Indicator dilution methods use the Stewart Hamilton equation:

\text{Q}= \frac{N}{\int_0^\infty C(t)\,dt}

where \text{Q} is the flow and N is the amount of indicator (e.g. mass) and C(t) is the concentration of indicator with time (dilution curve).

In Thermodilution, I seek to understand the  principles involved in the use of temperature as an indicator for determination of cardiac output (the blood flow the heart produces: \text{stroke volume}\times \text{heart rate} [ L/minute]

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