![]() V D /V T is a common way to quantify dead space. The fraction of the tidal volume that does not contribute to gas exchange is known as dead space fraction (V D /V T where V T = tidal volume and V D = dead space volume). A certain amount of dead space is normally present in every person (this is known as anatomical dead space: see below). This concept can be extended to include factors that cause a dead space effect. Its use may reduce the need for invasive monitoring and/or repeated arterial blood gas analyses.Īrtificial Respiration Blood Gas Analysis Carbon Dioxide.Simply put, dead space represents the volume of ventilated air that does not participate in gas exchange. Statistical analysis demonstrated a good correlation between the mean of ETCO2 and PaCO2 in each of the modes of SIMV, CPAP and T-Tube SIMV (42.5 ± 17.3 and 45.8 ± 17.1 r = 0.893, P < 0.0001), CPAP (37 ± 9.7 and 39.4 ± 10.1 r = 0.841, P < 0.0001) and T-Tube (36.1 ± 9.9 and 39.4 ± 11 r = 0.923, P < 0.0001), respectively.Įnd-tidal CO2 measurement provides an accurate estimation of PaCO2 in mechanically ventilated patients. ![]() ![]() The correlation of end-tidal carbon dioxide to (ETCO2) CO2 was obtained in all patients.Ī total of 219 arterial blood gases were obtained from 87 patients (mean age, 71.7 ± 15.1 years). The difference between ETCO2 and PaCO2 was tested with a paired t-test. Patients who were undergoing one of the mechanical ventilation methods such as: synchronized mandatory mechanical ventilation (SIMV), continuous positive airway pressure (CPAP) and T-Tube were enrolled in this study. The aim of the present trial was to study the relationship between end-tidal CO2 tensions with PaCO2 measurements in mechanically ventilated patients.Įnd-tidal carbon dioxide levels were recorded at the time of arterial blood gas sampling. ![]() ![]() Monitoring of End-tidal carbon dioxide (ETCO2) as a surrogate, noninvasive measurement of arterial carbon dioxide (PaCO2) is one of the methods used for this purpose in intubated patients. Patients undergone mechanical ventilation need rapid and reliable evaluation of their respiratory status. ![]()
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