![]() We conclude, that the ventilation of emergency patients can only be correctly adjusted according to values derived from an arterial blood gas analysis and ETCO2 measurements cannot be absolutely relied upon for accuracy except, perhaps, in patients without primary cardiorespiratory dysfunction. Monitoring end-tidal CO2 (ET-CO2) provides instantaneous information about ventilation (how effectively CO2 gas is being exhaled/eliminated by the respiratory. This can be explained by the fact that almost any degree of cardiorespiratory failure causes changes of the ventilation-perfusion ratio, impairing pulmonary CO2 elimination. Dividing the patients into three subgroups (1, During CPR II, respiratory disturbances of pulmonary and cardiac origin III, extrapulmonary respiratory disturbances), we found that only patients without primary cardiorespiratory damage showed a slight, but not statistically significant, correlation. Evaluation of the group of patients as a whole showed that there was no correlation whatsoever between the end expiratory and arterial CO2. On average during CPR, if adequate chest compressions are being delivered a cardiac index of 1.6-1.9 L/min/m2 can be generated, which correlates with ETCO2 pressures of 20mmHg. We used the side-stream capnometry module of the Defigard 2000 (Bruker, ChemoMedica Austria) and a portable blood gas analyzer (OPTI 1, AVL Graz, Austria). In the awake adult, normal cardiac index lies between 2.5-4 L/min/m2, with an ETCO2 of 35-45 mmHg. We evaluated the usefulness and practicability of using ETCO2 for correctly adjusting ventilation parameters in prehospital emergency care, by comparing arterial pCO2 and ETCO2 of 27 intubated and ventilated patients. End tidal CO2 (EtCO2) monitor End tidal CO2 (EtCO2) monitor. Measurements are taken at the patient’s airway. airway assessment for procedural sedation and analgesia, continued. ![]() Our mainstream sensor is manufactured by Philips Respironics, using sophisticated infrared absorption spectroscopy to measure EtCO2. In anaesthesia the ventilation volume is adjusted to the capnometric end tidal CO2 (ETCO2), taking into account a normal variation from the pACO2 of 3-8 mmHg. EtCO2 monitoring is one of the easiest ways to alert for failing health conditions, such as hyper or hypothermia but requires highly accurate and durable sensor. Monitoring end tidal CO2 values with non-invasive capnometry is a routine procedure in anaesthesia, emergency medicine and intensive care. Satisfactory artificial ventilation is defined as sufficient oxygenation and normo- or slight arterial hypocarbia. ![]()
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