# Unkown Blogger Pursues a Deranged Quest for Normalcy

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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]