A paramedic is treating a 58-year-old male in cardiac arrest. After endotracheal intubation, waveform capnography shows a persistent, flat waveform with an ETCO2 value of 0 mmHg despite effective chest compressions. What is the MOST likely cause of this finding?
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A
Severe bronchoconstriction
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B
The endotracheal tube is correctly placed in the trachea
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C
Esophageal intubation
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D
Return of spontaneous circulation (ROSC)