Biomedical Engineering > GATE 2021 > Cardiac Output Measurement
An inexperienced clinician was measuring the cardiac output of a healthy human by thermodilution technique. A 2.0 mL of cold saline solution of volume (Vi) at 7 °C was injected at the entrance of the right atrium. The change in blood temperature (∫0t1ΔTbdt) at the pulmonary artery was measured to be -20 Kelvin. second. The cardiac output F was calculated using the following formula
F = Q/(ρbcb∫0t1ΔTbdt)
where Q is the heat content of injectate in Joules, given by ViΔTiρici and ΔTi is the temperature difference between the injectate and blood. It was assumed that the density of blood (ρb in kg/m³) and the specific heat capacity of blood (cb in J/(kg.K)) were respectively equal to that of the injectate ρi and ci.
The clinician realized that there was an error in the measurement of F. Which of the following is TRUE?
F = Q/(ρbcb∫0t1ΔTbdt)
where Q is the heat content of injectate in Joules, given by ViΔTiρici and ΔTi is the temperature difference between the injectate and blood. It was assumed that the density of blood (ρb in kg/m³) and the specific heat capacity of blood (cb in J/(kg.K)) were respectively equal to that of the injectate ρi and ci.
The clinician realized that there was an error in the measurement of F. Which of the following is TRUE?
Correct : a, b
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