Clinical Application and Significance of End-Tidal Carbon Dioxide(ETCO2) Monitoring
author: Claudia
2023-09-27
ETCO2 monitoring is a valuable detection method in clinical anesthesia. And clinical anesthesia covers a wide range of complex conditions and many comorbidities. If the timely and accurate changes can be made to avoid the occurrence of severe hypoxic damage, the safety of surgical anesthesia can be greatly improved, which will benefit the patients and also protect the hospital staff's medical safety.
1.Monitor Ventilation Function
The V/Q ratio is normal in patients without obvious cardiopulmonary disease. To a certain extent, ETCO2 can reflect PaCO2, so a gradual increase in ETCO2 is a reflection of inadequate ventilation.
2.Locate the Endotracheal Tube
At present, there are three recognized correct methods to prove the endotracheal tube in the trachea:
1) The endotracheal tube is definitely seen to be in the glottis.
2) Clinical fiberoptic bronchoscope technology is the "gold standard" for determining the position of the endotracheal tube , but it is inconvenient to use.
3) The graph of ETCO2 can be observed.
1) The endotracheal tube is definitely seen to be in the glottis.
2) Clinical fiberoptic bronchoscope technology is the "gold standard" for determining the position of the endotracheal tube , but it is inconvenient to use.
3) The graph of ETCO2 can be observed.
3.Find the Mechanical Failure of the Ventilator in Time
Examples include dislodged joints, leaky circuits, twisted endotracheal tubes , obstructed air tubes, malfunctioning valve, and other mechanical failures.
4. Adjust Ventilator Parameters and Guide the Removal of Ventilator
1)Regulate ventilation;
2)ETCO2 is continuous non-invasive monitoring, which can be used to guide the temporary discontinuation of the ventilator. When SpO2 and ETCO2 remain normal during spontaneous breathing, the ventilator can be removed; the presence of abnormal ETCO2 should be noted and blood gas controls should be used if necessary.
2)ETCO2 is continuous non-invasive monitoring, which can be used to guide the temporary discontinuation of the ventilator. When SpO2 and ETCO2 remain normal during spontaneous breathing, the ventilator can be removed; the presence of abnormal ETCO2 should be noted and blood gas controls should be used if necessary.
5. Monitor Changes in CO2 Production in the Body
Intravenous infusion of a large amount of NaHCO3, elevated body temperature, sudden loosening of tourniquet, and malignant hyperthermia all increase CO2 production and ETCO2. Moreover, the rapid increase of ETCO2 is a sensitive early indicator of malignant hyperthermia.
Intravenous infusion of a large amount of NaHCO3, elevated body temperature, sudden loosening of tourniquet, and malignant hyperthermia all increase CO2 production and ETCO2. Moreover, the rapid increase of ETCO2 is a sensitive early indicator of malignant hyperthermia.
6.Understand the Changes of Alveolar Dead Space Volume and Pulmonary Blood Flow
PaCO2 is the PACO2 of the alveoli with hemoperfusion, and ETCO2 is the PaCO2 with ventilation. If ETCO2 is lower than PaCO2, Pa-ETCO2 increases or the CO2 waveform rises in a slanting shape, it indicates an increase in alveolar dead space volume and a decrease in pulmonary blood flow.
When lying on the side, no matter controlled breathing or spontaneous breathing, alveolar dead space will change. At this point, the upper lung has good ventilation but insufficient blood perfusion, and the lower lung has sufficient perfusion but insufficient ventilation, which can increase the alveolar dead space.
When lying on the side, no matter controlled breathing or spontaneous breathing, alveolar dead space will change. At this point, the upper lung has good ventilation but insufficient blood perfusion, and the lower lung has sufficient perfusion but insufficient ventilation, which can increase the alveolar dead space.
7. Monitor Circulatory Function
Shock, cardiac arrest and pulmonary infarction, decrease or stop of pulmonary blood flow, CO2 concentration rapidly decreases to zero, and CO2 waveform disappears. ETCO2 serves as an important noninvasive monitoring indicator for the effectiveness of precordial crushing during resuscitation and first aid, and its prognostic value is greater. At this point, ETCO2 level and cardiac output change correspondingly.
Shock, cardiac arrest and pulmonary infarction, decrease or stop of pulmonary blood flow, CO2 concentration rapidly decreases to zero, and CO2 waveform disappears. ETCO2 serves as an important noninvasive monitoring indicator for the effectiveness of precordial crushing during resuscitation and first aid, and its prognostic value is greater. At this point, ETCO2 level and cardiac output change correspondingly.
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