In low pulmonary blood flow states such as with a full cardiac arrest, an insufficient amount of expired CO2 would allow a CO2 confirmation deice to falsely indicate an esophageal intubation.

• 在低肺血流状态如完全心搏停止，呼吸末CO2不足将可能导致CO2确认设备错误地认为进行了食道插管。