Capnography, which indirectly measures cardiac output, is a great tool during "codes" to measure effectiveness of CPR and also can be as an early indication of return of spontaneous circulation (ROSC). When a patient experiences return of spontaneous circulation, the first indication cn be a sudden rise in the ETCO2. Similarly, a sudden drop in ETCO2 may indicate the patient has 'lost pulse' and CPR may need to be restarted.
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