Shock

bdoss2006

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Does all types of shock cause low etco2 or just septic? If it’s just septic why is that? I know a lot of stuff uses etco2 of <26 for sepsis, but not other types of shock.
 

NomadicMedic

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E tank

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Does all types of shock cause low etco2 or just septic? If it’s just septic why is that? I know a lot of stuff uses etco2 of <26 for sepsis, but not other types of shock.
ETCO2 correlates directly with cardiac output. We use blood pressure as a surrogate for cardiac output, so you can say ETCO2 correlates directly with blood pressure. The less blood going through the lungs, the less CO2 is expired via the mouth and nose. Doesn't matter what the reason for that fall in blood flow thru the lungs is, whether its volume loss due to bleeding, catastrophic fall in heart contractility, loss of vasomotor tone in sepsis or spinal cord injury....whatever. Low blood flow = low ETCO2
 
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