10 free NAVLE practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
NAVLE Practice Test 8Tutor mode
Question 1 of 10
Clinical Practice
During isoflurane anesthesia for an elective procedure, an intubated, mechanically ventilated adult patient has been stable for 40 minutes, with an esophageal temperature of 99.0°F (37.2°C), heart rate 90 beats/min, respiratory rate 12 breaths/min and end-tidal CO2 of 38 mm Hg with a normal waveform. The capnograph suddenly reads 0 mm Hg with a flat line. SpO2 is 97% with a strong, regular pulse, the ECG is unchanged and Doppler blood pressure is 100 mm Hg systolic. Which of the following is the most likely cause of the capnograph change?