![]() However, there are many factors that influence capnography values in the cardiac arrest patient.Ĭardiac arrests with a respiratory cause generally have much higher ETCO2 readings than those of cardiac origin. Capnography as a tool to predict outcomes and guide careįor patients who present in cardiac arrest, early measurement of ETCO2 during resuscitation may be a reliable predictor of the likelihood of achieving a sustained return of spontaneous circulation. The combination of these factors makes ETCO2 monitoring a valuable addition to cardiac arrest management protocols. It has also been shown that end tidal carbon dioxide values have a strong correlation with cardiac output. The shape of the waveform reflects the emptying pattern of the alveoli and provides information on the ventilation-perfusion ratio. These devices also provide a measurement of the end-tidal CO2 reading (ETCO2), or the amount of carbon dioxide in air at the end of the exhaled breath.Īnalysis of both the waveform and the ETCO2 measurement provides important information on the respiratory, circulatory and metabolic status of the patient. ![]() In the pre-hospital setting, capnography capabilities have been largely integrated into portable cardiac monitors, where capnography readings are displayed as a waveform or capnogram. By measuring the amount of light that hits the sensor, capnography devices are able to determine the partial pressure of carbon dioxide present in the stream of air. Capnography reviewĬapnography measurements are achieved by shining an infrared light through a stream of air in an endotracheal tube or oxygen delivery device onto a sensor. Additional applications during cardiac arrest management include using capnography to influence decisions to terminate resuscitation, as well as identifying those patients who may have a higher probability of achieving return of spontaneous circulation by evaluating end tidal carbon dioxide measurements at the onset of resuscitation. Capnography as a tool during cardiopulmonary resuscitation is now considered an integral part of monitoring the quality of chest compressions and detecting a return of spontaneous circulation. The application of waveform capnography in prehospital care has expanded far beyond its most ubiquitous use as the gold standard for endotracheal tube placement confirmation. Learn How capnography can improve cardiac arrest careĭecember 16th, 2016 CapnoAcademy Articles, LearnĬapnography guided care gives EMS providers the information they need to improve survival for patients who experience an out-of-hospital cardiac arrest
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