Importance

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Abstract

A computer system (104) is connected to an injection means (107) to inject at a first place (101 ) a bolus warmer or colder than patient's blood. The travelling temperature deviation thus introduced to the patient's vascular system (103) passes the pulmonary circulation (111), where an extravascular thermovolume (112) may be present. When the temperature deviation reaches the second place (102), where blood temperature is measured by a sensor device (117) connected to the computer system (104), it is recorded as Thermodilution Curve (15), from which the computer system (104) determines an extravascular thermovolume estimate. Depending on that result the computer system (104) calculates a new amount of bolus to be injected by the injection means (107). The higher the extravascular thermovolume estimate, the higher the new amount of bolus. The new travelling temperature deviation thus introduced to patient's vascular system (103) eventually reaches the second place (102), where it is recorded as an improved Thermodilution Curve (17) from which cardio-vascular parameters of improved accuracy are derived by the computer system (104).

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